Carrier 39NX user guide manual

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With Product Integrated Controls (PIC)

Installation, Operation, and

Start-Up Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS ...................2

GENERAL ...................................2

INSTALLATION .............................2-64

Service Area Requirements ...................2

Remote Control Box Option ..................2

• REMOTE CONTROL BOX CONDENSATE PREVENTION

Make Electrical Connections ..................3

Variable Frequency Drives ...................38

Water Valve Assemblies .....................38

• VALVE WIRING

Duct Static Pressure Probe (VAV Units) ......39

Space Temperature Sensor ..................40

Outdoor-Air Temperature Sensor .............42

Mixed-Air Temperature Sensor ...............42

Enthalpy Switch ............................43

• CONTROL RANGES

Supply-Air Temperature Sensor ..............44

Return-Air Temperature Sensor ..............44

Heat Interlock Relay .........................45

Fan Relay ..................................45

Duct High Humidity Switch ..................45

Wall-Mounted Relative Humidity Sensor ......46

Duct-Mounted Relative Humidity Sensor ......47

• LOCATION FOR OUTSIDE AIR RELATIVE HUMIDITY

• LOCATION FOR RETURN AIR RELATIVE HUMIDITY

Mixing Box Linkage .........................47

Airﬂow Switch ..............................48

Low-Temperature Thermostat ................48

Outdoor-Air Thermostat .....................48

Filter Status Switch .........................49

High-Pressure Switch .......................49

Air Quality Sensors .........................49

Constant Outside Air (OAC) Control ..........50

• PROBE INSTALLATION

• OAC CALIBRATION

• USING OAVP VALUES TO DETERMINE DUCT AIRFLOW

• FIELD-SUPPLIED OR HIGH-VELOCITY PRESSURE TRANSDUCERS

Field Wiring Connections ....................52

• REMOTE LOCAL INTERFACE DEVICE (HSIO)

• RETURN-AIR TEMPERATURE SENSOR, OUTDOOR-AIR TEMPERATURE SENSOR, ENTHALPY SWITCH, AND MIXED-AIR TEMPERATURE SENSOR

• SPACE TEMPERATURE SENSOR (SPT)

• DAMPER ACTUATORS

• SMOKE CONTROL OPTION

• ANALOG DEVICE FOR ANALOG OUTPUT TEMPERATURE CONTROL

39L,NX

Central Station Air-Handling Units

• DEVICE UNDER DISCRETE OUTPUT TEMPERATURE CONTROL

• DISCRETE OUTPUT DEVICE UNDER TIMECLOCK CONTROL

• HUMIDIFICATION DEVICES

• AIR QUALITY SENSOR

• OUTSIDE AIR VELOCITY PRESSURE (OAVP) SENSOR

• FAN VOLUME CONTROL

• ELECTRIC HEATER

• CARRIER COMFORT NETWORK INTERFACE

• OUTDOOR-AIR THERMOSTAT

CONTROL SYSTEM .......................64-68

Processor (PSIO Master) and Option (PSIO Slave)

Modules .................................65

Relay (DSIO) Module .......................65

Local Interface Device (HSIO) ...............67

CONTROL OPERATION ...................69-91

Accessing Functions and Subfunctions .....69

Display Functions ..........................69

• SUMMARY DISPLAY

• STATUS FUNCTION

• HISTORY FUNCTION

• TEST FUNCTION

Programming Functions ...................81

• SERVICE FUNCTION

• SET POINT FUNCTION

• SCHEDULE FUNCTION

CONTROL OPERATING SEQUENCE .......92-102

Constant Volume and Variable Air

Volume Units ............................92

Constant Volume Units Only ................96

Variable Air Volume Units Only .............99

START-UP ..............................103-108

Initial Check ..............................103

Quick Test ................................103

Electronic Valve Actuator Field Test ........108

CONTROL LOOP CHECKOUT ............108,109

To Check Operation of Analog Outputs .....108

VALVE TROUBLESHOOTING .............109-111

General ...................................109

⁄2-in. Through 11⁄4-in. Electric Hot Water/Steam

All

Valve Assemblies .......................109

All 11⁄2-in. Through 3-in. Valve Assemblies ..110 CONTROL MODULE

TROUBLESHOOTING ..................111,112

General ...................................111

Module Replacement (PSIO, DSIO) .........112

UNIT TROUBLESHOOTING ...............113-115

METRIC CONVERSION CHART .............116

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 3 Tab 1b

PC 201 Catalog No. 533-913 Printed in U.S.A. Form 39L,NX-2SI Pg 1 3-96 Replaces: 39L,NX-1SI

IMPORTANT: This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance with these instructions may cause radio interference. It has been tested and found to comply with the limits of a Class A computing device as deﬁned by FCC regulations, Subpart J of Part 15, which are designed to provide reasonable protection against such interference when operated in a commercial environment.

SAFETY CONSIDERATIONS

Installation and start-up of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualiﬁed service personnel should install, start up, or service air-conditioning equipment.

When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes, including ANSI (American National Standards Institute) Z223.1 (latest version). Wear safety glasses and work gloves.

Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if power is not disconnected. Electrical shock and personal injury could result.

Do not store or use gasoline or other ﬂammable vapors and liquids in the vicinity of this or any other appliance.

GENERAL

The Product Integrated Control (PIC) option is available for 39L and 39NX indoor units with a draw-thru conﬁguration. The PIC control box can be supplied as part of a dedicated PIC section; it is factory-installed and wired and has the same hand (orientation) as the fan section. The control box can also be shipped separately for remote mounting without a PIC section. For the remote control box option, all connections from the control box to the unit are made to a junction box in the unit’s fan section.

The control box includes electronic modules, fuses, relays, transformers, terminal blocks, low-limit air temperature protection (optional), static pressure transducer (VAV

[Variable Air Volume] units only) and high-pressure switch (VAV units). An ON/OFF switch is included to shut off the power to the control box.

PIC environmental limitations are as follows:

Shipping Temperature — −20 to 165 F Shipping Humidity — 10 to 95% Operating Temperature — 32 to 125 F Operating Humidity — 30 to 90%

INSTALLATION

Follow all basic installation instructions for 39L or 39NX units as described in the 39L or 39NX Installation, Start-Up, and Service Instructions shipped with the unit. To verify the PIC and PIC option conﬁgurations according to the model numbers, see Fig. 1 and 2.

Leave protective coverings on the unit until it is installed inside and protected from the elements, construction debris, and dirt.

Use one of the keys provided in the 39L or 39NX installation packet (located in fan section) to open the control box door.Visually inspect all components and wiring for any damage. Remove the valve assembly packages and the sensor packages from the fan section. For units with PIC sections, remove protective plastic caps from the bulkhead ﬁttings (located on the top edge of the control box) and discard.

Verify that the 10.0 amp ON/OFF switch located on the PIC control box door is in the OFF position. Do not turn the

power supply on at this time.

NOTE: The 39NX and 39L air handlers are designed for indoor applications. Modiﬁed units are available for outdoor applications on pier or slab mounts (not curb mounts). Prod-

uct integrated controls are not available for outdoor applications. Consult your Carrier sales representative for further

details.

ServiceArea Requirements — Article 110-16 of the

NEC (National Electrical Code) describes electrical installation.All 39L and 39NX PIC installations must comply with the minimum clearances required for electrical installation as listed in Table 110-16(a) of the code. Make sure to provide the necessary clearance from the PIC unit to any adjoining wall. Refer to the base unit installation instructions for detailed dimensions for each unit section.

Remote Control Box Option — This option allows

the PIC control box to be mounted away from the unit; the remote control box (Fig. 3) must be wired to the supply fan section. Mount the remote control box assembly to the mechanical room wall near the unit using ﬁeld-supplied Unistrut metal framing or equivalent supports. The control box has 4 mounting holes in the back of the enclosure for this purpose.

Mount the remote control box as follows:

1. Loosen and remove the 4 nuts securing the control panel in the control box.

2. Remove the control panel from the box; set the panel and nuts aside for reassembly later.

3. Mount the control box to the Unistrut support using ﬁeldsupplied fasteners.

4. Locate, mark, and drill pilot holes on the top of the box for each of the following:

• Motor starter wiring

• Actuator and sensor wires to fan section junction box

• Supply power wires (ac)

• Valve wiring or tubing (water valves, ﬁeld-supplied

sensors, or other devices)

5. Expand the pilot holes as required. Recommended sizes are as follows:

• Motor starter wiring —3⁄4in. (5 wires)

• Actuator and sensor wires to fan section junction

box —

⁄4in. to 1 in. (number of wires and hole di-

ameter determined by application)

• Supply power wires (ac) —

⁄2in. or3⁄4in.

• Valve wiring or tubing — size as required

Fan section panels are provided with pilot holes that can be drilled or punched to accomodate an electrical conduit for the remote control box wiring. Where possible, install the conduit in a panel that will not be removed, such as the discharge panel. See Fig. 4.

REMOTE CONTROL BOX CONDENSATE PREVENTION — When the remote control box is installed, precautions must be taken to prevent condensation from forming inside the junction box mounted in the unit’s supply fan section. Standard installation practice is to mount the remote control box adjacent to the air handling unit and then to enclose the Class II wiring in ﬂexible conduit between the control box and the junction box in the fan section.

The sheet metal housing of the control box is not airtight, therefore warm, moist air can migrate through the ﬂexible conduit to the junction box in the fan section. Condensate can form inside the junction box and possibly on the terminal lugs.

To prevent moist air from migrating through the conduit, seal the control wires inside the conduit at the remote control box enclosure. See Fig. 4. Use a nonconductive, nonhardening sealant. Permagum (manufactured by Schnee Morehead) or sealing compound, thumb grade (manufactured by Calgon), are acceptable materials.

MakeElectrical Connections — 39L and 39NX units

have internal control wiring for the operation of the PIC section and its control devices. The control system requires a dedicated 120 vac or 230 vac (50 or 60 Hz) power circuit capable of providing a minimum of 10 amps (but not greater than 20 amps) to the control box. The actual number of controls on one power source depends on the installation and power circuit requirements. Do not run PIC power wiring in the same conduit as sensor wiring or control wiring of ﬁeldinstalled devices.

IMPORTANT: To ease installation, control wiring is located on the service side of the unit with electrical connectors provided at all unit separation points. If a unit is separated into pieces for installation, rejoin all connectors in their original alpha-numeric sequence upon reassembly. Connectors for vertical fan sections that are shipped out of the normal operating position must also be joined at ﬁnal assembly.

For units with an integral PIC section, all unit factory control wiring is internal. Only a small number of wires must be ﬁeld-installed. All internal wiring consists of plenum wires which enter the rear of the control box through sealed ﬁttings. Control wiring is 18 to 20 gage, 2-conductor twisted pair.

The electrical power disconnect and fan motor starter are ﬁeld-supplied and installed. Connections are provided in the control box to wire a ﬁeld-supplied HOA (HANDS/OFF/ AUTOMATIC) switch. If an HOA switch is used, it must be ﬁeld-installed in the supply and return fan motor starter circuit. The factory-wired high-pressure switch (variable air volume only) and low-temperature thermostat options are energized when the supply fan circuit is powered.

See Fig. 5-7 for control box component arrangements and Fig. 8 for fan motor wiring. PIC input and output points are listed in Table 1. Consult the wiring diagram located in the control box or Fig. 9-12 for further details.

Power is present in the PIC control box in the motor starter circuit even when the dedicated power to the PIC control box is off.

The supply and return fan starter circuits are independent from each other. Either circuit and its related control box interface can have 24 vac, 120 vac, or 240 vac power.

All options that require a factory-installed transformer are fused with 3.2 amp fuses on the secondary of each transformer.

When the control box is shipped separately for remote mounting, all unit wiring terminates in a junction box located in the fan section. Refer to Fig. 12 for the applicable wiring diagram and Table 2 for junction box connections.

If the unit is provided with a factory-installed smoke control option, refer to the section titled Field-Wiring Connections, Smoke Control Option, page 54.

All PIC electrical components are UL (Underwriters’Laboratories) listed. The electronic modules are approved under UL HVACEquipment Standard 873. PIC units are listed and labeled by ETL (Engineering Testing Laboratory) to comply with UL Standard 1995 for heating and cooling units, and comply with NFPA (National Fire Protection Association) Standard 90A.

LEGEND

ABX — Air Blender AF — Airfoil CV — Constant Volume IGV — Inlet Guide Vanes FC — Forward-Curved FMB — Filter Mixing Box MXB — Mixing Box PIC — Product Integrated Controls VAV — Variable Air Volume

*The cv capacity rating is the ﬂow (gpm) through a valve at 1 psi pres-

sure drop.

Fig. 1 — Basic PIC Order Number

LEGEND

AF — Airfoil CV — Constant Volume DX — Direct Expansion FC — Forward-Curved FMB — Filter Mixing Box MXB — Mixing Box N.C. — Normally Closed N.O. — Normally Open PIC — Product Integrated Controls VAV — Variable Air Volume

*The cv capacity rating is the ﬂow (gpm) through a

valve at 1 psi pressure drop.

Fig. 2 — PIC Option Order Number

NOTE: Dimensions in [ ] are in millimeters.

Fig. 3 — Control Box for Remote Mounting

Fig. 4 — Sealing Control Wiring in Flexible Conduit

LEGEND (Fig. 5-12, Table 2)

AFS — Airﬂow Switch AO — Analog Output AOTC — Analog Output Temperature Control AQ AQ C—Contactor

— Air Quality Sensor, No. 1

— Air Quality Sensor, No. 2

CCW — Counterclockwise CH — Channel CR — Control Relay CUST — Condensing Unit Status CV — Constant Volume CW — Clockwise CWV — Chilled Water Valve DHH — Duct High Humidity DO — Discrete Output DOTC — Discrete Output Temperature Control DSIO — Control Module, Electric Heat and/or DX DTCC — Discrete Time Clock Control DX — Direct Expansion DXS — DX Cooling Stage DXSD — Direct Expansion Cooling Shutdown EHS — Electric Heaters ELEC — Electric ENT — Enthalpy Switch EQUIP — Equipment EVAC — Smoke Evacuation Input EXD — Exhaust Air Damper Actuator FLTS — Filter Status Switch FSD — Fire Shutdown Device FU — Fuse GND — Ground HIR — Heat Interlock Relay HOA — Hand-Off-Auto. Switch HPS — High-Pressure Switch HSIO — Keyboard and Display Module HT — Heat HUM — Humidiﬁer HWV — Hot Water Valve IGV — Inlet Guide Vane Actuator LTT — Low Temperature Thermostat MAD — Mixed-Air Damper Actuator MAT — Mixed-Air Temperature MPSIO — Master Processor Module

(Processor Module)

OAD — Outdoor-Air Damper Actuator OARH — Outdoor-Air Relative Humidity OAT — Outdoor-Air Temperature OAVP — Outdoor-Air Velocity Pressure

OT — Outside-Air Thermostat PH — Preheat PL — Plug Assembly PRESS — Smoke Pressurization Input PSIO — Processor Module PURG — Smoke Purge Input RAD — Return-Air Damper Actuator RAT — Return-Air Temperature RFAN — Return Fan RFR — Return Fan Relay RFVC — Return Fan Volume Control RH — Relative Humidity RVP — Return Velocity Pressure SAT — Supply-Air Temperature SF — Fan Status Relay SFAN — Supply Fan SFR — Supply Fan Relay SMK — Smoke SNB — Snubber SP — Static Pressure Transducer SPSIO — Slave Processor Module

(Option Module)

SPT — Space Temperature SVP — Supply Velocity Pressure SW — Switch TB — Terminal Block Terminal TEMP — Temperature TRAN — Transformer VAV — Variable Air Volume W/ — With WO/ — Without

Marked Wire or Cable Terminal (Marked) Terminal (Unmarked)

Terminal Block Splice (Factory)

Splice (Field) Wiring Factory

Wiring Field Control Wiring Field Power Option or Accessory Common Potential

NOTES:

1. Use copper conductors only.

2. Wire is in accordance with National Electrical Code (NEC).Forlocalcodes, replace original wires with 90 C wire or its equivalent.

3. Replace wires fromIGV, FLTS,MAT,SAT,OAD,RAD,andELEC HTwith 125 C plenum cable conductor as required.

4. Input channel numbers and points for conﬁguration of the optional analog output temperature control (AOTC) follow:

CHANNEL SENSOR DESCRIPTION

1 SAT Supply-Air Temperature 2 OAT Outdoor-Air Temperature 3 MAT Mixed-Air Temperature 6 SPT Space-Air Temperature 7 RAT Return-Air Temperature

34 TEMP Preheat or Optional Carrier Sensor

5. Reference for wire markers, where ‘X’ represents a numeral:

X — Item number on wiring harness BX — Box wire CX — Cable KX — Accessory kit wire

ARRANGEMENT FOR SIZES 03 AND 06

ARRANGEMENT FOR SIZES 08 THROUGH 35

Fig. 5 — PIC Section Control Box Component Arrangements, 39L

Fig. 6 — PIC Section Control Box Component Arrangement, 39NX Sizes 07-21

Fig. 7 — PIC Section Control Box Component Arrangement, 39NX Sizes 26-92

Fig. 8 — Fan Motor Starter Circuit and PIC Control Wiring Interface — PIC Power for

Control Circuit From Dedicated Source

MODULE,

DEFAULT ADDRESS

PSIO (Processor) ADDRESS 1

PSIO (Option) ADDRESS 31

DSIO (Electric Heat) ADDRESS 19

DSIO (DX without Electric Heat) ADDRESS 19

DSIO (DX with Electric Heat) ADDRESS 49

Table 1 — Input and Output Points

INPUT

SAT AI 1 IGV* AO 13 OAT AI 2 MIXD AO, DO† 14 MAT AI 3 HWC AO 15 RH AI 4 CWC AO 16 LTT DI 5 SF DO 17 SPT AI 6 HIR* DO 18 RAT AI 7 — — — SP* AI 8 — — — AFS DI 9 — — — FLTS DI 10 — — — OARH AI 11 — — — ENT DI 12 — — — SVP* AI 31 RFVC* AO 43 RVP* AI 32 HUM1 AO, DO 44 DHH DI 33 HUM2 DO 45 TEMP AI 34 AOTC AO 46 PRES DI 35 DOTC DO 47 EVAC DI 36 DTCC DO 48 PURG DI 37 — — — FSD DI 38 — — — AQ1 AI 39 — — — AQ2 AI 40 — — — OAVP* AI 41 — — — METER DI 42 — — — — — — EHS1 DO 23 — — — EHS2 DO 24 — — — EHS3 DO 25 — — — EHS4 DO 26 — — — EHS5 DO 27 — — — EHS6 DO 28 — — — EHS7 DO 29 — — — EHS8 DO 30 CUST DI 19 DXS1 DO 23 DXSD DI 20 DXS2 DO 24 — — — DXS3 DO 25 — — — DXS4 DO 26 — — — DXS5 DO 27 — — — DXS6 DO 28 — — — DXS7 DO 29 — — — DXS8 DO 30 CUST DI 49 DXS1 DO 53 DXSD DI 50 DXS2 DO 54 — — — DXS3 DO 55 — — — DXS4 DO 56 — — — DXS5 DO 57 — — — DXS6 DO 58 — — — DXS7 DO 59 — — — DXS8 DO 60

INPUT

TYPE

CHANNEL

NUMBER

OUTPUT

TYPE

CHANNEL

NUMBER

AFS — Airﬂow Switch (Supply Fan AI — Analog Input

AO — Analog Output AOTC — Analog Output Temperature

AQ1, 2 — Air Quality Sensors 1, 2 CUST — Condensing Unit Status

CWC — Chilled Water Coil DI — Discrete Input DHH — Duct High Humidity DO — Discrete Output DOTC — Discrete Output Temperature

DTCC — Discrete Output Timeclock

*Available on VAV only. †Discrete output with two-posi ion damper control.

Status Switch)

Control

(Outdoor Air Thermostat)

Control Control

LEGEND

DXS1-8 — Direct Expansion Cooling DXSD — Direct Expansion Cooling EHS1-8 — Electric Heater Stages 1-8

ENT — Enthalpy Switch EVAC — Evacua ion FLTS — Filter Status Switch FSD — Fire Shutdown HIR — Heat Interlock Relay HWC — Hot Water Coil HUM1, 2 — Humidity Stages 1, 2 IGV — Inlet Guide Vanes LTT — Low Temperature Thermostat

MAT — Mixed-Air Temperature METER — Meter (Pulsed Dry-Contact

Stages 1-8 Shutdown

(also labelled FRZ)

Input)

MIXD — Mixed-Air Dampers OARH — Outdoor-Air Relative Humidity OAT — Outdoor-Air Temperature OAVP — Outdoor-Air Velocity Pressure PRES — Pressurization PURG — Purge RAT — Return-Air Temperature RFVC — Return Fan Volume Control RH — Relative Humidity RVP — Return Velocity Pressure SAT — Supply-Air Temperature SF — Supply Fan Relay SP — Static Pressure SPT — Space Temperature SVP — Supply Velocity Pressure TEMP — Optional Temperature Input

Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical)

Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)

Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical)

Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)

Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical)

Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)

Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box

Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)

Table 2 — Junction Box Connections for Optional Remote Control Box

REMOTE

CONTROL BOX

LOCATION

MPSIO 2 SAT — BLK 1 MPSIO 3 SAT — RED 2 MPSIO 8 MAT — BLK 3 MPSIO 9 MAT — RED 4

TB3 10 FLTS — BLK 5

MPSIO 28 FLTS — RED 6

TB3 10 LTT — K3 7

MPSIO 13 LTT — K1 8

TB2 19 OAD — BLK 9 TB2 20 OAD — WHT 10 TB2 6 OAD — GRN 11

MPSIO 40 OAD — RED 12

TB2 21 RAD — BLK 13 TB2 22 RAD — WHT 14 TB2 7 RAD — GRN 15 TB2 6 RAD — RED 16 TB2 27 EXD — BLK 17 TB2 28 EXD — WHT 18 TB2 8 EXD — GRN 19 TB2 7 EXD — RED 20 TB2 15 SFAN1 — BLK 21

TB2 16 SFAN1 — WHT 22 MPSIO 38 SFAN1 — GRN 23 MPSIO 37 SFAN1 — RED 24

TB2 17 SFAN2 — BLK 25

TB2 18 SFAN2 — WHT 26

TB2 23 RFAN1 — BLK 27

TB2 24 RFAN1 — WHT 28

SPSIO 38 RFAN1 — GRN 29 SPSIO 37 RFAN1 — RED 30

TB2 25 RFAN2 — BLK 31

TB2 26 RFAN2 — WHT 32

SPSIO 12 PH — BLK 33 SPSIO 11 PH — RED 34

NOTES:

1. Pneumatic tubing to connect the airﬂow sensor in the fan to the remote control box is bundled with the internal PIC wiring to the junction box, but does not enter the box. Route tube directly to remote control box along with conduit containing wiring from junction box to remote control box.

2. See Legend on page 7.

CONTROL

BOX

TERMINAL

FAN SECTION

JUNCTION BOX

SIGNAL

JUNCTION

BOX

TERMINAL

Variable-Frequency Drives — The input signal for

the inverter must be 4 to 20 mA. Use a 2-conductor 20 AWG (American Wire Gage) cable (single twisted pair, unshielded) to connect the input of the inverter to the output of the PIC control terminals. See Fig. 8.

Wire the inverter so that if it is placed in the manual or bypass mode the low temperature thermostat and the highpressure switch (if supplied) are still in the motor control circuit to protect the unit.

Adjust the minimum inverter speed to provide at least 10% airﬂow when inlet guide vanes are at 0% (4 mA) and maximum design airﬂow when inlet guide vanes are at 100% (20 mA). Use the local interface device to verify that the

supply fan status ( ) shows the fan is ON and that the supply fan is operating at the lowest airﬂow adjustment. In-

crease inverter minimum speed as required. For additional information, see the Quick Test section on page 103.

Water Valve Assemblies — Water valve assemblies

(Fig. 13) are shipped inside the fan section for ﬁeld installation. All valve assemblies have electrically powered actuators. Each actuator has an external junction box for ﬁeld wiring.The junction box contains 24 vac power wires (WHITE/ BLUE, BLACK) and 4 to 20 mA signal wires (1RED,

−GREEN). The actuators operate the valve through a linear stroke; if power is lost, a return spring reverses the stroke and returns the valve stem to the normal position.

VAL VE ACTUATOR

ACTUATOR LINKAGE

VALVE BODY

To prevent electric shock and equipment damage, disconnect the power to the control box before installing valve assemblies. Turn power switch located on control box door to OFF.

On installations where valve mounting space is limited, use unions to couple valve assemblies to water lines. If unions do not provide sufficient clearance, refer to the Valve Troubleshooting section, page 109.

On chilled water applications or hot water applications with

⁄2to 3-in. valves, the valve actuators can be mounted in

1 any position above the centerline of the valve body.For steam applications or hot water applications with1⁄2to 11⁄4-in. valves that have actuators and high-temperature linkage extensions, mount the actuator above the centerline of the valve body and 45 degrees from vertical. This position helps to prevent actuator exposure to direct heat convection.

DO NOT install valve assembly where excessive moisture, corrosive fumes, and/or vibration are present.

INSTALL all 2-way valve assemblies so that they close against system ﬂow. An arrow on the valve body indicates the proper ﬂow direction.

ALWAYS install 3-way mixing valve with 2 inlet ﬂows and one outlet. Normal ﬂow will be from port B to port AB with stem up. See Fig. 14.

Fig. 13 — Valve Assembly (T ypical)

Fig. 14 — Three-Way Mixing Valve — Normal Flow,

T ypical Piping

VALVE WIRING

Valves MUST be connected to the correct processor module terminal to operate properly. Damage to the actuator may occur if the valve is improperly connected.

Hot WaterValves (Fig. 15) — Using a 4-conductor 20AWG cable (two twisted pairs, no shield), connect the hot water valve actuator as follows:

1. Using twist-on wire connectors, connect the BLACK and WHITE/BLUE leads inside the actuator junction box to the 24 vac power wires of the cable. Connect the other ends of the power wires to TB2, pins 11 and 12, in the PIC control box.

2. Using twist-on wire connectors, connect the RED ( ) and GREEN (−) leads inside the actuator junction box to the other 2 wires in the cable. Note the polarity of each wire.

3. Connect the positive signal wire (connected to the RED lead) to pin 43 on the processor module. Connect the negative signal wire (connected to the GREEN lead) to pin 44 on the processor module.

Chilled Water Valves (Fig. 16) — Using a 4-conductor 20 AWG cable (two twisted pairs, no shield), connect the chilled water valve actuator as follows:

2. Using twist-on wire connectors, connect the RED ( ) and GREEN (−) leads inside the actuator junction box to the other 2 wires in the cable. Note the polarity of each wire.

3. Connect the positive signal wire (connected to the RED lead) to pin 46 on the processor module. Connect the negative signal wire (connected to the GREEN lead) to pin 47 on the processor module.

Duct Static Pressure Probe (VAV Units) — The

duct static pressure probe is shipped inside the control box.

Select a location in the ductwork where the static pressure will be representative of the static pressure to be monitored and maintained (typically 2/3 of the distance down the duct from the fan). Install the probe with the tip facing the airﬂow. See Fig. 17.

Use

⁄4-in. OD approved polyethylene tubing for up to 50 ft (3⁄8-in. OD for 50 to 100 ft) to connect the probe to the 39L or 39NX unit. Route the tubing back to the mechanical room and connect the tubing to the bulkhead ﬁtting labelled H (HIGH), located on the bottom edge of the 39L control box or top edge of the 39NX control box.

NOTE: If the probe is more than 100 ft from the control box, it is recommended that the static pressure sensor be removed from the control box and mounted remotely.The sensor should be mounted closer to the probe and then rewired to the original connections in the control box.

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 15 — Hot Water Valve Wiring

FACTORY WIRING FIELD WIRING

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 16 — Chilled Water Valve Wiring

Space TemperatureSensor (Fig. 18) — The space

temperature sensor (SPT) is packaged and shipped inside the fan section. It is installed on a building interior wall to measure room air temperature.

The wall plate accommodates both the NEMA (National Electrical Manufacturers’ Association) standard and the European use of a junction box to accommodate the wiring is recommended for installation. The sensor can be mounted directly on the wall, if acceptable by local codes.

DO NOT mount the sensor in drafty areas such as near heating or air conditioning ducts, open windows, fans, or over heat sources such as baseboard heaters or radiators. Sensors mounted in these areas produce inaccurate readings.

⁄4DIN (Deutsche Industrie Norm) standard. The

Fig. 17 — Duct Static Pressure Probe

Avoid corner locations. Allow at least 3 ft between the sensor and any corner. Airﬂow near corners tends to be reduced, resulting in erratic sensor readings.

The sensor should be mounted approximately 5 ft up from the ﬂoor, in the area representing the average temperature.

Install the sensor as follows:

1. Remove sensor cover. Using a small blade screwdriver,

insert blade into sensor cover latch slot on bottom of slat. Gently push upward on the screwdriver to release the cover latch. Rotate the cover forward as the screwdriver is removed.

2. Snap off the wall plate from the base assembly.

3. Feed the wires from the electrical box through the sensor

base assembly.

4. Using two 6-32 x

⁄8-in. ﬂat screws, mount the sensor base

assembly to the electrical box.

5. Dress the wires down and inside the perimeter of the sen-

sor base.

6. Attach the wall plate by snapping it onto the sensor base

assembly.

7. Replace the cover by inserting the top inside edge of the

cover over the tab on top of the sensor base assembly and rotating the cover down. Snap cover on.

Refer to Field Wiring Connections section, page 52 for wiring instructions and details. See Table 3 for Thermistor Resistance vs. Temperature Values.

NOTE: Clean sensor with damp cloth only. Do not use solvents.

NEMA — National Electrical Manufacturers’ Association

Fig. 18 — Space Temperature Sensor (P/N HH51BX001)

Table 3 — Thermistor Resistance vs. Temperature Values for Space Temperature Sensor, Return-Air

Temperature Sensor, and Supply-Air Temperature Sensor

RESISTANCE

(Ohms)

173,631.0 −30 38,308.7 22 10,698.1 74 3602.5 126 1409.7 178 168,222.0 −29 37,304.0 23 10,459.4 75 3533.4 127 1386.3 179 162,998.0 −28 36,328.8 24 10,226.8 76 3465.9 128 1363.3 180 157,954.0 −27 35,382.1 25 10,000.0 77 3399.8 129 1340.7 181 153,083.0 −26 34,463.0 26 9,778.9 78 3335.2 130 1318.6 182 148,378.0 −25 33,570.7 27 9,563.4 79 3272.0 131 1296.9 183 143,833.0 −24 32,704.2 28 9,353.1 80 3210.1 132 1275.6 184 139,442.0 −23 31,862.8 29 9,148.2 81 3149.6 133 1254.8 185 135,200.0 −22 31,045.7 30 8,948.4 82 3090.4 134 1234.3 186 131,101.0 −21 30,252.0 31 8,753.5 83 3032.5 135 1214.2 187 127,139.0 −20 29,481.1 32 8,563.4 84 2975.8 136 1194.5 188 123,310.0 −19 28,732.2 33 8,378.0 85 2920.3 137 1175.1 189 119,609.0 −18 28,004.6 34 8,197.1 86 2866.0 138 1156.1 190 116,031.0 −17 27,297.7 35 8,020.7 87 2812.9 139 1137.5 191 112,571.0 −16 26,610.8 36 7,848.6 88 2760.9 140 1119.2 192 109,226.0 −15 25,943.4 37 7,680.6 89 2710.0 141 1101.3 193 105,992.0 −14 25,294.7 38 7,516.8 90 2660.2 142 1083.7 194 108,863.0 −13 24,664.2 39 7,356.9 91 2611.4 143 1066.4 195

99,837.3 −12 24,051.4 40 7,200.9 92 2563.7 144 1049.4 196 96,910.2 −11 23,455.6 41 7,048.6 93 2516.9 145 1032.8 197 94,078.4 −10 22,876.5 42 6,900.0 94 2471.2 146 1016.5 198 91,338.6 −9 22,313.4 43 6,755.0 95 2426.4 147 1000.4 199 88,687.3 −8 21,765.9 44 6,613.4 96 2382.5 148 984.7 200 86,121.6 −7 21,233.5 45 6,475.2 97 2339.5 149 969.2 201 83,638.4 −6 20,715.7 46 6,340.3 98 2297.5 150 954.0 202 81,234.8 −5 20,212.2 47 6,208.5 99 2256.3 151 939.1 203 78,908.0 −4 19,722.4 48 6,079.9 100 2215.9 152 924.5 204 76,655.3 −3 19,245.9 49 5,954.3 101 2176.4 153 910.1 205 74,474.2 −2 18,782.4 50 5,831.7 102 2137.7 154 896.0 206 72,362.1 −1 18,331.5 51 5,712.0 103 2099.8 155 882.2 207 70,316.7 0 17,892.8 52 5,595.0 104 2062.6 156 868.6 208 68,335.6 1 17,465.9 53 5,480.8 105 2026.3 157 855.2 209 66,416.7 2 17,050.4 54 5,369.2 106 1990.6 158 842.1 210 64,557.9 3 16,646.1 55 5,260.2 107 1955.7 159 829.2 211 62,756.9 4 16,252.6 56 5,153.7 108 1921.5 160 816.6 212 61,012.0 5 15,869.6 57 5,049.7 109 1887.9 161 804.1 213 59,321.1 6 15,496.8 58 4,948.1 110 1855.1 162 791.9 214 57,682.4 7 15,133.8 59 4,848.8 111 1822.9 163 779.9 215 56,094.3 8 14,780.4 60 4,751.8 112 1791.3 164 768.2 216 54,554.9 9 14,436.4 61 4,657.0 113 1760.4 165 756.6 217 53,062.2 10 14,101.3 62 4,564.4 114 1730.1 166 745.2 218 51,615.9 11 13,775.1 63 4,473.8 115 1700.4 167 734.0 219 50,213.1 12 13,457.3 64 4,385.3 116 1671.3 168 723.1 220 48,853.0 13 13,147.9 65 4,298.9 117 1642.7 169 712.3 221 47,533.9 14 12,846.4 66 4,214.3 118 1614.7 170 701.7 222 46,254.7 15 12,552.8 67 4,131.7 119 1587.3 171 691.3 223 45,013.9 16 12,266.8 68 4,050.9 120 1560.4 172 681.0 224 43,810.3 17 11,988.1 69 3,971.9 121 1534.1 173 671.0 225 42,642.6 18 11,716.6 70 3,894.6 122 1508.2 174 661.1 226 41,509.8 19 11,452.0 71 3,819.1 123 1482.9 175 651.4 227 40,410.5 20 11,194.2 72 3,745.3 124 1458.0 176 641.8 228 39,343.9 21 10,943.0 73 3,673.1 125 1433.6 177 632.4 229

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

Outdoor-Air Temperature Sensor (Fig. 19) —

The outdoor-air temperature (OAT) sensor is shipped inside the fan section. The OAT sensor continuously monitors the temperature of the air outside the building. The integral shield prevents ice formation on the sensor conductors. A ﬁeldsupplied conduit junction box is required for installation. See Fig. 20.

Position the OAT sensor so that it accurately senses only the outdoor-air temperature. The sensor must be located upstream from outside air dampers and located where it is unaffected by interior and duct temperatures. During the unoccupied (fan off) period the sensor’s location should have a minimal effect on its readings.

Do not mount the sensor in direct sunlight. Inaccurate readings may result. It may be necessary to ﬁeld-fabricate a shield to protect the sensor from direct sunlight.

Do not mount the sensor near the exhaust from airhandling units or compressors, or near leakage drafts of indoor air, or near shrubbery or trees. Inaccurate readings may result. Do not mount under direct water runoff. Water may freeze around the sensor in winter and produce a false reading.

If sensor wire is shielded, strip back the sensor shield and tape it to prevent contact.

Position the sensor with the slotted end pointed downward.

The ﬁeld-supplied junction box housing must be threaded to screw onto a male conduit adaptor.The assembledbox and sensor mustbe mounted parallel to the building wall. See Fig. 20. The sensor can also be installed on a roof or other location.

For distances up to 500 ft, use 2-conductor 20 AWGcable to connect the sensor to the PIC terminals. Refer to the Field Wiring Connections section, page 52 for further wiring instructions. See Table4 for thermistor resistance according to temperature value.

Table 4 — Thermistor Resistance vs

Temperature Values for Outdoor-Air

RESISTANCE

(Ohms)

168,250 −40 5,000.0 77 121,350 −31 4,028.5 86

88,500 −22 3,265.0 95 65,200 −13 2,663.3 104 48,535 −4 2,185.0 113 36,476 5 1,801.5 122 27,665 14 1,493.0 131 21,165 23 1,244.0 140 16,325 32 1,041.5 149 12,695 41 876.0 158

9,950 50 739.5 167 6,245 68 627.5 176

⁄2-in. NPT electrical metal tubing (EMT)

Temperature Sensor

TEMPERATURE

(F)

RESISTANCE

(Ohms)

TEMPERATURE

(F)

Fig. 20 — Outdoor-Air Temperature

Sensor Installation

Mixed-Air Temperature Sensor — The optional

mixed-air temperature sensor (MAT) is factory wired and installed on all units with a factory-installed mixing box (MXB), ﬁlter mixing box (FMB), or air blender (AMX). On units without an AMX, MXB, or FMB, the optional MAT is packaged and shipped inside the fan section for ﬁeld installation.

The ﬁeld-installed MAT should be mounted downstream of the return air duct and ﬁlters, but as close as possible to the 39L or 39NX unit.

AVOID repeated bending of copper tubing, as this will place stress on the sensor element and lead to eventual breakage.

DO NOT fold or crimp copper tubing. USE CARE in forming and securing the element. STRIP back and tape the shield in order to prevent

contact.

Mount ﬁeld-installed MAT as follows (Fig. 21):

1. Punch a 1-in. diameter hole in the duct and feed the sen-

sor element through the hole. Mount the utility box on the outside of the duct.

2. Bend the copper tubing surrounding the sensor element

to conform to the area of the duct. Do not bend it to less

than 2

⁄2in. diameter on any turn. The sensor element should be evenly distributed over the entire cross sectional area of the duct.

Existing support structures may be used for the sensor element, as long as there is no metal-to-metal contact with the copper tubing, and the mounting does not interfere with other functions.

3. Use a ﬁeld-supplied plastic spacer, clamp, and screws to secure the sensor in the airstream. See Detail A, Fig. 21.

4. Using 2-conductor 20 AWG plenum-rated cable, connect the sensor to the PIC control box terminals.

Fig. 19 — Outdoor-Air Temperature Sensor

(P/N HH79NZ023)

NOTE:This sensor uses a resistance temperature device (RTD) element. Polarity is not a consideration.

When space does not allow working inside the duct, mount

as follows (Fig. 22):

1. Open a duct penetration on the opposite side of the sensor junction box.

2. Wrap the element around a

⁄4-in. PVC pipe, cut holes near the center of the duct on both sides and feed the pipe with sensor element through the hole.

3. Secure the seal around the PVC pipe. NOTE: If local codes do not permit the use of PVC, use

EMT instead.

Refer to Field Wiring Connections section, page 52 for wiring instructions and details. See Table 5 for RTD resistance vs temperature values.

Table 5 — RTD Resistance vs Temperature Values

for Mixed-Air Temperature Sensor

RESISTANCE

(Ohms)

693 −40 940 50 1223 140 719 −30 970 60 1257 150 745 −20 1000 70 1290 160 772 −10 1031 80 1325 170 799 0 1062 90 1360 180 827 10 1093 100 1395 190 854 20 1125 110 1430 200 883 30 1157 120 — — 912 40 1190 130 — —

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

Enthalpy Switch (Fig. 23) — The enthalpy switch and

mounting template are located in a box shipped inside the fan section.

The enthalpy switch is normally mounted in a horizontal position with the sensing element exposed to freely circulating outdoor air.

DO NOT install enthalpy switch in locations where excessive moisture, corrosive fumes, and/or vibration are present.

Fig. 22 — Alternate Mixed-Air Temperature

Sensor Installation

Mount the switch as follows:

1. Position mounting template on duct. Remove adhesive backing and press template onto outside air duct.

2. Drill four

⁄8-in. mounting holes as indicated on the

template.

3. Cut out center portion of duct as outlined on template.

4. Mount controller to duct using screws provided.

If no outside air duct is present, mount the enthalpy switch on a ﬁeld-supplied and installed plate upstream of the outside air damper.

Connect the red and blue wires of the enthalpy switch to the PIC control box terminals. Refer to Field Wiring Connections section, page 52 for further details.

CONTROLRANGES — See Fig. 24 for control settings and intermediate settings.

Fig. 21 — Mixed-Air Temperature Sensor

(P/N HH79NZ021) Installation

MOUNTING HOLES

Y E L

R E D

B L U

Fig. 23 — Enthalpy Switch (P/N HH57AC076)

DIAL

SETTING

CONTROL SETTINGS

RELATIVE

HUMIDITY (%)

20 50 80

78 F

(26 C)

73 F

(23 C)

68 F

(20 C)

62 F

(17 C)

73 F

(23 C)

68 F

(20 C)

63 F

(17 C)

58 F

(14 C)

68 F

(20 C)

63 F

(17 C)

59 F

(15 C)

53 F

(12 C)

4. Remove the adhesive backing from the gasket; attach the gasket to the outside of the junction box, aligning the holes in the gasket with the holes in the box.

5. Attach the junction box to the duct with the 2 screws provided.

6. Insert the probe assembly through the compression ﬁtting and into the duct. Tighten screws one half-turn past ﬁnger tight. Do not overtighten.

For distances up to 500 ft, use 2-conductor 20 AWGcable to connect the sensor to the PIC control box terminals. Refer to Field Wiring Connections section, page 32 for further details. See Table 3 for thermistor resistance vs. temperature values.

CONTROL

CURVE

A B C D

Fig. 24 — Enthalpy Control Settings

Supply-Air TemperatureSensor (Fig. 25) — The

supply-air temperature sensor (SAT) measures the temperature of the air as it leaves the supply fan. The sensor is factoryinstalled on the fan scroll.

Return-Air Temperature Sensor (Fig. 25) — The

return-air temperature sensor (RAT)is shipped inside the fan section. It measures the temperature in the return air duct. Mount the sensor in the middle of the return air duct approximately 4 to 5 ft from the return air damper. The sensor’s probe tip must be within a straight length of duct.

Mount the sensor as follows:

1. Remove the cover of the sensor junction box.

2. Drill or punch a turn air duct as indicated in Fig. 26.

3. Drill or punch 2 holes through the sensor gasket into the fan scroll.

⁄16-in. hole on the centerline of the re-

Fig. 25 — Supply/Return Air Temperature Sensor

(P/N HH79NZ019)

Fig. 26 — Return-Air Temperature Sensor

Installation

Heat Interlock Relay (Fig. 27) — The heat interlock

relay (HIR) is factory wired and installed on VAV units only. It is a single-pole, double-throw (SPDT) relay that provides normally-open and normally-closed contacts to interface with air terminal units. It allows the air terminals to open when the PIC unit goes into the heating mode. The contacts are silver cadmium oxide and are rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

The contact terminations are no. 6 screw terminals.

NOTE: The HIR is not used in digital air volume control (DAV) applications.

SDA 2 02 0

COI L

DO NOT install the duct high humidity switch in locations where excessive moisture, corrosive fumes, and/or vibration are present. Be sure to allow minimum dimensions from the elbows or junctions as indicated in Fig. 29.

Mount the DHH as follows:

1. Position the mounting template on the duct. Remove adhesive backing and press template onto duct.

2. Drill four template.

3. Cut out center portion of duct as outlined on template.

4. Mount DHH to duct using screws provided.

For distances up to 500 ft, use 2-conductor 20 AWG cable to connect the switch to the PIC control box terminals. Refer to Field Wiring Connections section, page 52 for further details.

The DHH adjustment knob provides settings from 15 to 95% relative humidity, The scale range is marked on the face of the switch. The high humidity set point should be at least 65%.

NOTE: The duct high humidity switch has a relative humidity differential of 5%.

⁄8-in. mounting holes as indicated on the

COM

Fig. 27 — Relay (P/N HK35AB001)

Fan Relay — Thefan relay is factory wired and installed

on all 39L and 39NX units. It is a SPST relay that provides a normally-open contact. The relay interfaces with the motor starter circuit and automatically starts/stops the fan when the HOA switch is in the AUTO mode. The contacts are silver cadmium oxide and are rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

The contact terminations are factory wired to TB1.

Duct High Humidity Switch (Fig. 28) — The duct

high humidity switch (DHH) is shipped inside the fan section. It is used as a safety input when the humidity control options have been ordered. The DHH adjustment knob provides settings from 15 to 95% humidity.

Locate the DHH control element in the duct, downstream of the humidiﬁer. Adjust the DHH to the ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) recommended maximum setting of 80%. Settings higher than 80% are not recommended.

The DHH is normally mounted in a horizontal position on the outside surface of the duct with the sensing element exposed to freely circulating air.

Fig. 28 — Duct High Humidity Switch

(P/N HL38ZG024)

Fig. 29 — Duct High Humidity Switch

Locations

Wall-MountedRelative Humidity Sensor (Fig.30) —

The wall-mounted relative humidity sensor is packaged and shipped inside the fan section. It is installed on interior walls to measure the relative humidity of the air within the occupied space.

The use of a junction box to accommodate the wiring is recommended for installation. The sensor may be mounted directly on the wall, if acceptable by local codes.

Avoid corner locations. Allow at least 3 ft between the sensor and any corner. Airﬂow near corners tends to be reduced, resulting in erratic sensor readings.

Sensor should be vertically mounted approximately 5 ft up from the ﬂoor, beside the space temperature sensor.

Install the sensor using 2 screws and 2 hollow wall anchors (if required); do not overtighten screws. See Fig. 31. Sensor must be mounted with terminals ACIN and OUT located at the top of the sensor as shown in Fig. 32.

For distances up to 500 ft, use 4-conductor 20 AWG cable (2 twisted pairs, no shield) to connect the sensor to the PIC control box terminals and power supply. Refer to Field Wiring Connections section, page 52 for wiring instructions and details.

The PIC controller has a space relative humidity default set point of 40%.

Never attempt to clean or touch the sensing element with chemical solvents, as permanent damage to the sensor will occur.

Fig. 30 — Wall-Mounted Relative Humidity Sensor

(P/N HL39ZZ001)

Fig. 31 — Wall-Mounted Relative Humidity

Sensor Installation

Fig. 32 — Wall-Mounted Relative Humidity

Sensor Positioning

Duct-Mounted Relative Humidity Sensor — The

duct-mounted relative humidity sensor and mounting template are packaged and shipped inside the fan section. The sensor is installed in either the return air ductwork or in the outside air ductwork. If 2 relative humidity sensors are ordered for differential enthalpy control, then the sensors must be installed in both the return air and outside air ducts. If the sensor is used for control of a humidiﬁer, install the sensor in the return air duct.

The PIC controller has a return air relative humidity de-

fault set point of 40%. LOCATION FOR OUTSIDE AIR RELATIVE HUMIDITY

— Locate the sensor where it accurately measures outdoor conditions, yet is protected from the elements. During the unoccupied (fan off)period, the sensor’slocation should have a minimal effect on its readings.

LOCATION FOR RETURN AIR RELATIVE HUMIDITY — Locate the sensor at least 6 in. upstream or 15 in. downstream of a 90 degree turn in the ductwork. The best location is 15 in. downstream of the 90 degree turn of the duct. The probe should be mounted in the center of the duct. See Fig. 33.

Mount the relative humidity sensor (Fig. 34) as follows.

1. Position mounting template on duct.

2. Drill four template.

3. Punch a 1 template.

4. Mount sensor to duct using four no. 8 screws. Install 9-in. sensor probe into the 1

⁄8-in. mounting holes as indicated on the

⁄8-in. hole as indicated on the mounting

⁄8-in. hole.

Fig. 33 — Duct-Mounted Relative Humidity

Sensor Locations

Never attempt to clean or touch the sensing element with chemical solvents, as permanent damage to the sensor will occur.

MixingBox Linkage — On units with mixing box (MXB)

or ﬁlter mixing box (FMB), the actuator and linkage are factory installed. The actuator is directly linked to the outdoorair damper and holds the damper closed. No adjustment is necessary.

For shipping purposes, the secondary linkage rod connecting the outdoor-air and return-air dampers is factory set for a closed return-air damper.

Adjust the secondary linkage as follows:

1. Open the door of the MXB or FMB to access the return

air damper crankarm. NOTE: On MXB/FMB with top outdoor-air damper, it

may be necessary to remove the vertical panel holding the return-air damper to access the return-air damper crankarm.

2. Loosen the setscrew on the return-air damper crankarm.

3. Move the damper to its full open position.

4. Secure the setscrew on the return-air damper crankarm.

5. Close the MXB or FMB access door.

Fig. 34 — Duct-Mounted Relative Humidity Sensor

(P/N HL39ZZ002) Installation

Airﬂow Switch — The airﬂow switch (AFS) is a snap-

acting SPDT switch that is factory installed in the PIC control box. It senses the air supplied by the 39L or 39NX unit and provides the microprocessor module with a 24 vac discrete signal for fan status. See Fig. 35.

Alength of plenum tubing connects the switch to the probe

located on the fan side plate.

The airﬂow switch range is 0.05 to 2.0 in. wg with a deadband of 0.02 in. wg at minimum set point and 0.1 in. wg at maximum set point.

Low-Temperature Thermostat (Fig. 36 ) — The

optional low-temperature thermostat (LTT) is factory wired and installed. It is used to protect the chilled water coil from freezing whenever abnormally cold air passes through the coil.

The LTT consists of a 20-ft capillary tube that is serpentined in the airstream on the entering side of the chilled water coil. It has a range of 34 to 60 F and is factory set at 35 F.

The LTT is wired in series with the motor starter fan relay. If any 1-ft section of the capillary tube senses cold air at or below the thermostat setting, the fan shuts down.Amanual reset is provided to restart the fan after the abnormal problem is ﬁxed. The temperature setting is ﬁeld-adjustable.

To adjust the temperature set point, turn the adjustment screw (located on the top of the case) until the position indicator is at the desired temperature. (A clockwise rotation increases the set point.)

DO NOT set low-temperature thermostat below 35 F. Damage to freezestat may result.

If the temperature exceeds the set point by5Formore, the reset button will restore the circuit.

Outdoor-Air Thermostat (Fig. 37) — Also called

the condensing unit status (CUST) switch, the outdoor air thermostat is a temperature-actuated switch used in systems with direct-expansion cooling. The thermostat is ﬁeldinstalled in the outdoor condensing unit to prevent the system from operating when the outdoor-air temperature is lower

than the condensing unit’s minimum temperature. When installed, the thermostat must be set to the minimum operating temperature of the condensing unit. If the condensing unit has an optional low-ambient control (Motormaster device), an outdoor-air thermostat is not required.

The outdoor-air thermostat is an SPST switch; the contacts open on temperature rise and the set point is adjustable from 45 to 75 F (7.2 to 23.9 C). To increase the set point, turn the indicator clockwise. See Fig. 37 for thermostat set point adjustment and mounting hole locations. Thermostat should be mounted inside condensing unit control box where it can sense the outdoor air temperature but is protected from rain and snow.

TURN SCREW CLOCKWISE TO INCREASE AIRFLOW

TURN SCREW COUNTERCLOCKWISE TO DECREASE AIRFLOW

NORMALLY CLOSED CONTACT

NORMALLY OPEN CONTACT

CLOSED CONTACT

SPDT SNAP ACTING SWITCH

MOUNTING BRACKET

HIGHPRESSURE INLET

LOWPRESSURE INLET

SPDT — Single-Pole, Double Throw

Fig. 35 — Airﬂow Switch (P/N HK06WC030)

ADJUSTMENT SCREW

MANUAL RESET BUTTON

Fig. 36 — Low-Temperature Thermostat

(P/N HH22CZ001)

Fig. 37 — Outdoor-Air Thermostat (Condensing Unit

Status Switch)

Filter Status Switch — The ﬁlter status switch (FLTS)

is factory-installed in the ﬁlter section on all PIC-equipped units. The switch is a snap-acting SPDT switch. When dirty ﬁlter elements cause the pressure drop across the ﬁlter media to exceed the switch setting, the switch closes and sends an alarm signal to the PIC.

The 39L units use a single switch. In 39NX units, up to 3 switches can be connected in parallel. When the switches are wired in parallel, it is not possible to isolate an alarm signal to a single switch.

The FLTS has an operating range of 0.05 to 2.0 in. wg. Factory settings for the switch are as follows:

Filter Type

Setting (in. wg)

Flat 0.5 Bag/Cartridge 1.0 Final 1.5

The FLTS electrical ratings are as follows: 300 va pilot duty at 115 to 277 vac

10 amps non-inductive to 277 vac Rated for NO (normally open) and NC (normally closed) contacts.

High-Pressure Switch (Fig. 38) — The high-

pressure switch (HPS) is factory installed in the PIC control box on VAV units only. It is a snap-acting SPDT switch with manual reset that is used to shut down the supply fan whenever the duct pressure reaches the switch setting. The manual reset is used to restart the fan after the problem has been corrected.

The switch is factory set at 3.0 in. wg. It has a range of

1.4 to 5.5 in. wg and can be ﬁeld adjusted for speciﬁc applications.

Adjust the high-pressure switch setting as follows:

1. Loosen conduit enclosure retaining screw, pull ﬁrmly on

the bottom end and snap off cover.

2. Raise set point by turning slotted adjustment screw

(located at top of range spring housing) clockwise. Turn adjustment screw counterclockwise to lower set point.

3. To change or check calibration, use a T assembly with 3 rubber tubing leads. Attach one lead to the HPS and another to an accurate manometer with the appropriate range. Apply pressure through the third lead and approach set point slowly.

4. Adjust set point to at least 0.5 in. wg greater than conﬁgured static pressure set point.

Air Quality Sensors (Fig. 39) — The air quality (AQ)

sensors are shipped inside the fan section for ﬁeld installation. Two types of sensors are supplied; one sensor monitors the conditioned air space, and the other sensor monitors the return air duct. Both sensors use infrared technology to detect the levels of CO2present in the air.

Sensor descriptions and part numbers are shown in Table 6. To mount the sensor, refer to the installation instructions shipped with the sensor.

Table6—CO

Sensor Accessories

CO2SENSOR ACCESSORY

PART NUMBERS

DESCRIPTION

CGCDXSEN001A00 Wall Mount Sensor (No Display) CGCDXSEN002A00 Wall Mount Sensor with Display CGCDXSEN003A00 Duct Mount Sensor (No Display) CGCDXGAS001A00 Sensor Cal bration Service Kit CGCDXPRM001A00 User Interface Program (UIP)

The CO2sensors listed in Table 6 are all factory set for a range of 0 to 2000 ppm and a linear voltage output of 2 to 10 vdc. Fig. 40 shows ventilation rates for various CO2set points when outside air with a typical CO2level of 350 ppm is used to dilute the indoor air. Refer to the instructions supplied with the CO2sensor for electrical requirements and terminal locations.

Any changes to the sensor’s factory conﬁguration require the purchase of the User Interface Program (UIP) or Sensor Calibration Service Kit, which also contains the UIP.

To accurately monitor the quality of the air in the conditioned air space, locate the sensor near the return air grille so it senses the concentration of CO

leaving the space. The sensor should be mounted at least 1 ft above or 1 ft below the thermostat to avoid direct breath contact.

Do not mount the space sensor in drafty areas such as near supply ducts, open windows, fans, or over heat sources. Allow at least 3 ft between the sensor and any corner. Avoid mounting the sensor where it is inﬂuenced by the supply air; the sensor gives inaccurate readings if the supply air is blown directly onto the sensor or if the supply air does not have a chance to mix with the room air before it is drawn into the return air stream.

To accurately monitor the quality of the air in the return air duct, locate the sensor at least 6 in. upstream or 15 in. downstream of a 90 degree turn in the duct. The downstream location is preferred. Mount the sensor in the center of the duct.

If the sensor is mounted in the return air duct, readjust the mixed-air dampers to allow a small amount of air to ﬂow past the return air damper whenever the mixing box is fully open to the outside air. If the damper is not properly adjusted to provide this minimum airﬂow, the sensor may not detect the indoor-air quality during the economizer cycle.

Fig. 38 — High-Pressure Switch (P/N HH02WC001)

Fig. 39 — Air Quality (CO2) Sensor

24 Vac.

OUT

PRESSURE

SPAN

ZERO

PRESSURE TRANSDUCER :

Part Number :

Range : 0 -

0 . 1 in.

of water

CARRIER

CORPORATION

T40 - 001C - 04 - 012

9A32201

(Wall Mount Version Shown)

CO2CONCENTRATION (PPM)

Fig. 40 — Ventilation Rates Based on CO2Set Point

Constant Outside Air (OAC) Control — This fea-

ture ensures a continuous supply of outside air to the unit and occupied space. The OAC control monitors the outside air velocity pressure (OAVP) with a probe and pressure transducer.The pressure transducer is factory-installed; the probe is factory-supplied for ﬁeld installation in the outside air ducts. See Fig. 41 and 42.

PROBE INSTALLATION — Locate each probe in a straight portion of the outside air duct with any dampers, elbows, or ﬁttings at least 2 diameters away. The probe should be in a portion of the duct where the airﬂow is uniform, so that the probe senses the average air velocity in the duct. The probe must also be located so that measurements at the probe are not inﬂuenced by the opening or closing of the outdoor-air dampers.

Install the probe at a 90 degree angle to the airﬂow and ensure that the holes in the probe are facing and in line with the airﬂow. The probe tube that is closest to the incoming airﬂow measures velocity pressure; the rear tube measures duct static pressure. Use approved plenum tubing to connect the probe to the bulkhead ﬁttings on top of the control box. For runs up to 150 ft, use 150 ft, use3⁄8-in. OD tubing. Use at least 25 ft of tubing to prevent pulsations and erratic operation. Coil any extra tubing if necessary.

If the outside air duct is large, additional probes can be installed in the duct and manifolded to obtain a more accurate velocity pressure reading for the entire duct. Manifold tubing must be larger than the plenum tubing connecting the manifold to the control box. See Fig. 43 and the preceding for recommended tube sizes.

⁄4-in. OD tubing. For runs over

Fig. 41 — OAVP Transducer (P/N HK05ZG004)

Fig. 42 — OAVP Probe (P/N 35DN40007001)

NOTE:High-pressuremanifoldconnectionsshown. Low-pressure connections are identical and must duplicate high-pressure connections.

Fig. 43 — Probe Manifolding

OAC CALIBRATION — Once the probe and tubing are installed, input the set point to match the probe readings. Before adjusting the OAVP probe, ensure that the supply-air fan is providing the maximum design airﬂow and that the outside-air dampers are adjusted for the design outdoor airﬂow intake.

To calibrate the PIC processor to match the probe location, use a precision manometer to measure the velocity pressure in the outdoor air duct at design conditions. Use the HSIO (local interface device) or Building Supervisor to input the value as the OAVP set point.

Note that the probe does not measure true velocity pressure; when positioned as recommended, the probe measures

a velocity pressure 1.563 times that of the velocity pressure in the duct. This multiplier (magniﬁcation) factor varies with the probe’s location, and can even be negative if the probe is located at an elbow or turn. All OAVPvalues displayed on the HSIO incorporate the multiplier factor to show the true duct velocity pressure.

If a precision manometer is not available, read the velocity pressure value at the HSIO when the system is running at maximum design airﬂow and input that value as the set point. During normal operation, the velocity pressure is held constant as the supply fan modulates.

USING OAVP VALUES TO DETERMINE DUCT AIRFLOW — It is possible to determine the airﬂow (cfm) in the outside air duct based on the readings obtained by the OAVP probe. See the following procedure.

Use the HSIO and status function ( ) to display the outside air velocity pressure (Pv) at the transducer.

If the airﬂow obtained by the preceding method is different from the design airﬂow or a measurement obtained with a balancer, the OAVP probe is not sensing the average duct velocity and/or the probe’s multiplier factor is effectivelynot

1.563. To match the design or measured airﬂow to the airﬂow determined with the preceding formulas, relocate the probe as recommended or use the HSIO and service

function ( ) to change the probe multiplier factor.

FIELD-SUPPLIED OR HIGH-VELOCITY PRESSURE TRANSDUCERS — The default pressure transducer installed at the factory (P/N HK05ZG004) has a range of 0.00 to 0.05 in. wg, which matches an air velocity range of approximately 225 to 680 fpm. The maximum velocity for optimum OAC operation and response, however, is 620 fpm. If the average duct air velocity is greater than 620 fpm, use one of the alternate transducers shown in Table 7.

For a ﬁeld-supplied pressure transducer, use the service function ( ) to conﬁgure the OAC control with the transducer’s speciﬁcations:

OALV = Transducer minimum output voltage OAHV = Transducer maximum output voltage OALR = Transducer low pressure

(range minimum output) value

OAHR = Transducer high pressure

(range maximum output) value

Find the average velocity (V) in the duct, in fpm:

4005

=Pv = V

Obtain the cross-sectional area of the duct in sq ft. (A). To

determine the airﬂow (F) in the duct, in cfm:

VxA=F

Table 7 — OAC Pressure Transducers

INDICATED VELOCITY

CARRIER

PART NO.

HK05ZG004 T40-005C-04-013 0.00 — 0.05 0.013 — 0.037 0.005 — 0.045 0.008 — 0.024 0.003 — 0.029 360 — 620 225 — 680 HK05ZG005 T40-001C-04-012 0.00 — 0.10 0.025 — 0.075 0.010 — 0.090 0.016 — 0.048 0.006 — 0.057 505 — 875 320 — 960 HK05ZG006 T40-003C-04-015 0.00 — 0.30 0.075 — 0.225 0.030 — 0.270 0.048 — 0.144 0.019 — 0.173 875 — 1520 555 — 1665

MODUS PART

NO.

RANGE (in. wg)

PRESSURE AT

TRANSDUCER (in. wg)

Optimum

Range

Theoretical

Range

TRUE VELOCITY PRESSURE

IN DUCT (in. wg)

Optimum

Range

Theoretical

Range

VELOCITY IN DUCT

(fpm)

Optimum

Range

Theoretical

Range

Field Wiring Connections — All ﬁeld wiring must

comply with National Electric Code (NEC) and all local requirements. The recommended wiring is as follows:

Dampers, actuators, — 4-conductor 20 AWG cable and valves (2 twisted pairs, unshielded) Sensors — 2-conductor 20 AWG cable

(one twisted pair, unshielded)

Refer to Table 8 for recommended brands and part

numbers.

Table 8 — Recommended Sensor and

Device Wiring

MANUFACTURER

PART NUMBER

Regular* Plenum*

Alpha 1895 — American A21501 A48301 Belden 8205 88442 Columbia D6451 — Manhattan M13402 M64430 Quabik 6130 —

*Within a building. NOTE: Wiring is 20 gage, 2-conductor twisted cable.

REMOTE LOCAL INTERFACE DEVICE (HSIO) — When ordered as part of a 39L or 39NX unit, the HSIO is factoryinstalled and fully wired.

To reinstall the HSIO in a remote location away from the control box, refer to the factory wiring connections in Fig. 9-12 and proceed as follows:

1. Use a 20 AWG 2-conductor twisted wire pair (Belden

No. 8205 or equivalent) to supply power to the HSIO module. Use a 20AWG 3-conductor cable shielded with drain wire (Belden No. 8772 or equivalent) for communication with the HSIO. Cable length must not exceed 1000 ft.

2. Pull the 2 cables (power and signal) through the electri-

cal conduit to the NEMA standard box or HSIO. Leave approximately 4 ft of wire in the PIC control box for terminations.

3. Route the cables from the PIC control box to the HSIO

bracket. Secure the HSIO cables to the existing cables using either tie wraps or by twisting the HSIO cables around the existing cables. Strip back the jacket 6 in. on each cable after cutting off the excess. Connect the power cable at the PIC control box to the existing 3-pin connector hanging at the HSIO bracket. The wires should be terminated in the screw-type locking clamps on Terminals 1 and 2.

4. Connect the signal cable at the PIC control box to the

existing 4-pin communications connector hanging at the HSIO bracket. The wires should be terminated in the locking clamps on Terminals 1, 2, and 3. The shield should be terminated at the HSIO bracket (ground). Be sure to note the color coding used on the cable for later reference when terminating the other end of the cable.

5. At the NEMA standard box or HSIO, connect the power

conductors to Pin 1 and 2 of the 3-pin plug. Using the color coding from the above step, connect the signal cable to Pin 1, Pin 2, and Pin 3 of the 4-pin communications connector. Remove the shield and drain wire from this end of the cable.

6. After the HSIO is installed inside the remote cover, con-

nect the 4-pin and 3-pin plugs to the HSIO.

RETURN-AIR TEMPERATURE SENSOR, OUTDOORAIR TEMPERATURE SENSOR, ENTHALPY SWITCH, AND MIXED-AIR TEMPERATURESENSOR — Wires are to be connected to the proper terminals on the processor module. See Fig. 44 for details.

Select a 20 AWG twisted pair, no shield cable. Connect as

per table below:

SENSOR

PROCESSOR

MODULE

PIN NO.

Return-air temperature sensor (RAT) 20 and 21 Outside-air temperature sensor (OAT) 5 and 6 Enthalpy switch (ENT) 34 and TB2-3 Mixed-air temperature sensor (MAT) 8 and 9 Space temperature sensor (SPT) 17 and 18

NOTE: The MAT is factory wired on all units with a factory-installed mixing box, ﬁlter mixing box, or air blender.

SPACETEMPERATURESENSOR (SPT) —The space temperature sensor cover includes terminal block TB1, a jumper between Pin E2 and Pin E3, and an RJ11 female connector. The RJ11 female connector connects the service tool with the Carrier Comfort Network.

Jumper MUST be in place between Pin E2 and Pin E3 or inaccurate readings could result. Ensure that the jumper is in place before installing the sensor.

Using a 20 AWG twisted pair conductor cable rated for the application, connect one wire of the twisted pair to Terminal T1 and connect the other wire to Terminal T2 on TB1. See Fig. 45.

The other ends of the wires are connected to the processor (PSIO master) module. As polarity is not a consideration, connect one wire to Terminal 17 and one wire to Terminal 18 of the processor module.

RJ11 Plug Wiring — Refer to the Carrier Comfort Network Interface, page 64, for communication bus wiring and cable selection. The cable selected must be identical to the CCN communication bus wire used for the entire network.

Cut the CCN wire and strip the ends of the RED, WHITE, and BLACK conductors. Insert and secure the RED ( ) wire to Pin J2 of the SPT terminal strip TB1. Insert and secure the WHITE (ground) wire to Pin J3 of the SPT terminal strip TB1. Insert and secure the BLACK (−) wire to Pin J5 of SPT terminal strip TB1.

The other end of the communication bus cable must be connected to the remainder of the CCN communication bus at the COMM1 plug on the processor (PSIO master) module. Refer to Carrier Comfort Network Interface section, page 64, for more details.

DAMPERACTUATORS— The PIC processor can activate a ﬁeld-installed modulating exhaust/relief damper. This is achieved by wiring the factory-supplied damper actuator in series with the factory-supplied and ﬁeld-installed mixing box damper actuator.

The PIC processor can also activate a ﬁeld-installed damper actuator mounted in a ﬁeld-supplied mixing box. These actuators are available from the factory when ordered as an option with the unit.

See Table 9 for recommended actuators. NOTE: The actuator selected must be capable of receiving

a 4 to 20 mA signal and must have a total impedance of less than 250 ohms. Wire should be 20 gage minimum, twistedpair type and rated for the application.

For factory-supplied actuators that are ﬁeld-installed, the 24 vac power source is included with the unit wired in the control box. For ﬁeld-supplied actuators, a 24 vac power source must be ﬁeld-supplied and installed for each actuator.

To prevent equipment damage: Power must NOT be connected to an earth ground; actuator case must NOT be connected to control input terminals.

Field-Supplied Exhaust Damper — Wire the 4 to 20 mAsignal of the factory-supplied exhaust damper actuator as follows (Fig. 46):

1. Select a 20 AWG twisted pair conductor cable rated for the application. Identify the positive ( ) and negative (−) signal contacts on the actuator.

2. Install cable from the actuator to the PIC control box.

3. Remove jumper no. 84 from between terminals TB2, 7 and 8. Connect positive ( ) lead to terminal 8 of TB2. Connect negative (−) lead to terminal 7 of TB2.

Field-Supplied Modulating Mixing Box — Wire the 4 to 20 mA signal of the factory-supplied damper actuator as follows (Fig. 47):

1. Select a 20 AWG twisted pair conductor cable rated

for the application. Identify the positive ( ) and negative (−) signal contacts on the actuator.

2. Install cable from the actuator to the PIC control box.

3a. For the outside-air damper (OAD) actuator, connect the

positive ( ) lead to pin 40 of the processor module. Connect the negative (−) lead to terminal 6 of terminal block 2 (TB2).

b. If the actuator is factory-supplied, connect the actua-

tor’s 24 vac power wires to TB2, terminals 19 and 20. If the actuator is ﬁeld-supplied, connect the power wires to a separate, isolated 24 vac power source.

LEGEND

ENT — Enthalpy Switch MAT — Mixed-Air Temperature Sensor OAT — Outside-Air Temperature Sensor RAT — Return-Air Temperature Sensor SPT — Space Temperature Sensor

Field Wiring

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 44 — Field Wiring of Sensors

IMPORTANT: Jumper may be connected from E1 to E3. Move jumper to connect E2and E3 before installingsensor,otherwise incorrectspacetemperature values are generated.

Fig. 45 — Space Temperature Sensor Wiring

Table 9 — Recommended Actuators

PART

NO.

VOLTAGE (50/60 Hz)

VA (24 vac)

IMPEDANCE

(Ohms)

SIGNAL INPUT

(mA)

DAMPER AREA

(sq ft)

TORQUE

(in.-lb)

STROKE

Parallel Opposed

HF27BB006 24 18 82.5 4 to 20 8.4 10.8 15 2 in. HY27BB001* 24 60 250.0 4 to 20 42 54 50 180° HF27BB010 24 44 82.5 4 to 20 106 137 190 3

⁄2in.

*Shipped with drive HF39CB001, which must be ﬁeld-installed on actuator. NOTES:

1. All actuators are spring return.

2. Damper arearatings are nominal and arebased on standard (NOTlow leak) dampers at 1.0 in. wg pressure and 2000 fpm velocity.

3. Actuator wire coding is as follows: HF27BB006 - BLACK and WHITE (24 vac)

RED ( signal) GREEN (− signal)

HY27BB001 - BLACK and WHITE (24 vac)

ORANGE ( signal) BLUE (− signal)

HF27BB010 - WHITE/BLUE and BLACK (24 vac)

RED ( signal) GREEN (− signal)

4. Actuator HH27BB006 is equipped with 20 ft of plenum cable. Wires for actuators HY27BB001 and HF27BB010 are in the actuator junction box.

5. Actuators are available as an option when ordered with the unit.

4a. For the return-air damper (RAD) actuator, connect the

positive ( ) lead to TB2, terminal 6. Connect the negative (−) lead to TB2, terminal 7.

b. If the actuator is factory-supplied, connect the actua-

tor’s 24 vac power wires to TB2, terminals 21 and 22. If the actuator is ﬁeld supplied, connect the power wires to a separate, isolated 24 vac power source.

Field-Supplied Two-Position Damper — The factorysupplied SPDT relay must be ﬁeld-installed and wired. The relay contacts are rated as follows:

48 va at 24 vac and .25 service factor 125 va at 115 vac and .25 service factor 125 va at 230 vac and .25 service factor

The relay provides a set of contacts (normally open and normally closed) using no. 6 screw terminals; the 24 vdc coil connections are through

⁄4-in. quick connects.

Using a 20AWG twisted cable, connect the relay coil contacts 1 and 2 to the processor module pins 41 and 42. See Fig. 48.

To connect the ﬁeld-supplied two-position damper actuator (Fig. 48): Connect one contact of the actuator to the normally-open contact of the relay .Connectthe common contact of the relay to one leg of the power source. Connect the other contact of the actuator to the other leg of the power source.

SMOKE CONTROL OPTION — The smoke control option includes 3 relays which control the 4 different modes of the option. These relays are factory wired.Terminalblock 5 (TB5) provides an easy means to wire the ﬁeld-supplied smoke control panel to the PIC controller on the 39L or 39NX unit. See Fig. 49 and 50.

The approved building ﬁre alarm system must provide 4 different normally-open dry contact closures. A ﬁeldsupplied 24 vac, double-pole, double-throw (DPDT) ﬁre shutdown (FSD) relay rated for the application (240 vac with a 10 amp minimum) is required.

All power going through the smoke control panel dry contacts and the FSD relay coil is furnished by the PIC control box. A 24 vac fused power source uses a factory-installed 3 amp in-line fuse. See Fig. 49 or 50 for smoke control option wiring details.

Wire as follows:

1. Disconnect all power at the unit, PIC control box, return fan (if applicable), and ﬁre panel.

2. Wire the supply fan motor starter per Fig. 8.

3. If applicable, wire the return fan as shown in Fig. 49 or

50. NOTE: Return fan power may be different from supply

fan power.

4. Connect leads from the return fan HOA switch to terminals 9 and 10 of TB5.

5. Wire the ﬁrst set of contacts of the DPDT FSD. For ﬁre shutdown of the unit from a local smoke detector, wire ONLYthe normally-closed contacts (NEC, class 1 power rated) to the hot leg of the fan power supply and terminal 2 of TB1.

6. Terminal 8 of TB5 is internally connected to ground. Connect one side of the EVAC, PURG, and PRES dry contacts of the smoke control panel to terminal 8 of TB5.

7. Connect the other side of the PRES dry contact to terminal 3 of TB5. Connect the other side of the PURG dry contact to terminal 4 of TB5. Connect the other side of the EVAC dry contact to terminal 5 of TB5.

8. Connect the normally-open dry contacts of the FSD device (smoke detector with auxilary relay and/or smoke control panel dry contact set) to terminal 1 and 2 of TB5.

9. Connect the 24 vac relay coil of the FSD relay to terminals 1 and 8 of TB5.

10. Connect the second pole of the FSD relay to the hot leg of the return fan power supply and to terminal 11 of TB5.

Refer to Fig. 49 or 50 for point-to-point wiring of the smoke

control option inside the PIC control box.

Fig. 46 — Exhaust Damper Actuator Wiring (Smoke

Control Option or Modulating Dampers)

LEGEND

Field Wiring

EXD — Exhaust Air

Damper Actuator

LEGEND

OAD — Outside Air Damper RAD — Return Air Damper

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Actuator Actuator

Factory Wiring Field Wiring

Fig. 47 — Field-Supplied Mixing Box Actuator Signal Wiring

*Field-installed if only outside air damper is used.

LEGEND

OAD — Outside Air Damper

Actuator Field Wiring

Fig. 48 — Field-Supplied Two-Position Damper Relay and Actuator Wiring

LEGEND

AO — Analog Output EVAC — Evacuation EXD — Exhaust Air Damper Actuator FSD — Fire Shut Down HOA — HAND/OFF/AUTO Switch HPS — High-Pressure Switch LTT — Low Temperature Thermostat OAD — Outside Air Damper Actuator PRES — Pressurization RAD — Return Air Damper Actuator

NOTE: The return fan power circuit may be different than the supply fan starter power.

RFR — Return Fan Relay SF — Supply Fan Contactor SFR — Supply Fan Relay TB — Terminal Block TRAN — Transformer

Fig. 49 — Smoke Control Option Wiring Schematic (39L)

Remove Jumper Factory Wiring

Field Wiring

LEGEND

*Factory installed and wired if ordered with exhaust box. NOTE: Return fan power circuit may be different than the supply fan

starter power.

RFR — Return Fan Relay SF — Supply Fan Contactor SFR — Supply Fan Relay TB — Terminal Block TRAN — Transformer

Fig. 50 — Smoke Control Option Wiring Schematic (39NX)

Factory Wiring Field Wiring

ANALOG DEVICE FOR ANALOG OUTPUTTEMPERATURE CONTROL — The analog controlled device selected must be capable of receivinga4to20mAsignal. Its internal impedance must not exceed 600 ohms.

The power supply of the analog device must be ﬁeld in-

stalled.

Using a 20 AWG twisted wire pair, wire the control signal

as follows (Fig. 51).

1. Connect the positive ( ) contact to pin 46 of the option module.

2. Connect the negative (−) contact to pin 47 of the option module.

DEVICE UNDER DISCRETE OUTPUT TEMPERATURE CONTROL—The factory-supplied SPDT relay must be field installed and wired. See Fig. 52. The relay contacts are rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

The relay provides a set of contacts (normally open and normally closed) using no. 6 screw terminals while the 24 vdc coil connections are through

⁄4-in. quick connects.

Using a 20AWG twisted cable, connect the relay coil contacts 1 and 2 to the option module pins 50 and 51. Connect the device to be controlled to the normally-open or normallyclosed contacts of the relay. Pay close attention to the contact ratings listed above. See Fig. 53.

DISCRETE OUTPUT DEVICE UNDER TIMECLOCK CONTROL—The factory-supplied SPDT relay must be field installed and wired. (Fig. 52.) The relay contacts are rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

The relay provides a set of contacts (normally open and normally closed) using no. 6 screw terminals while the 24 vdc coil connections are through

⁄4-in. quick connects.

Using a 20AWG twisted cable, connect the relay coil contacts to the option module pins 53 and 54. Connect the device to be controlled to the normally-open or normallyclosed contacts of the relay.Pay close attention to the contact ratings listed above. See Fig. 54.

Field Wiring

Fig. 51 — Wiring of Analog Device for Analog Output Temperature Control

SDA 2 02 0

COM

COI L

Fig. 52 — Single-Pole, Double-Throw (SPDT) Relay

HUMIDIFICATION DEVICES Modulating Valve for Analog Output Humidity Control

(Fig. 55) — Valve selected must be able to receivea4to 20 mA signal and must NOTexceed an impedance of600 ohms. Valve power supply must be ﬁeld-installed and isolated.

Install valve on humidiﬁer piping and connect actuator power supply.Using a 20 AWG twisted wire pair, connect the positive ( ) contact of the valve actuator to pin 40 of the option module. Connect the negative (−) contact of the valve actuator to pin 41 of the option module.

Two-Stage Humidiﬁcation Control Relays — Two SPDT relays with silver cadmium contacts are shipped with the unit when 2-stage humidiﬁcation control is requested. See Fig. 52. The relays are rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

The relays must be ﬁeld installed within a ﬁeld-supplied enclosure rated for the application.

Wire the stage 1 relay as follows: Connect the 24 vac coil contacts 1 and 2 to pins 41 and 42 of the option module. The stage 1 relay is intended to open a normally-closed steam valve and not energize the spray pump. See Fig. 56 for ﬁeld wiring of the stage 1 valve and steam pump.

Wire the stage 2 relay as follows: Connect the 24 vac coil contacts 1 and 2 to pins 44 and 45 of the option module. The stage 2 relay is intended to open a second normally-closed steam valve. See Fig. 56 for ﬁeld wiring of the stage 2 valve.

Duct High Humidity Switch — The humidistat is factory supplied and ﬁeld installed. It is shipped (with a template) in its own box.

All wiring must comply with applicable local codes and ordinances. Wire the DHH as follows:

1. Turn switch on PIC control box to OFF.

Turn switch on PIC control box to OFF before connecting DHH wiring, otherwise electrical shock or equipment damage can result.

2. Connect wire from terminal 3 of terminal block 2 (TB2)

to the terminal labeled ORANGE on the DHH sensor. See Fig. 57.

3. Connect wire from pin 7 of the option module to the sen-

sor screw terminal labelled RED.

During humidiﬁcation, the duct high humidity switch must be set to the maximum humidity level desired in the supply duct (80% minimum).

Duct Mounted/Wall Mounted Relative Humidity Transmitter (Fig. 58) — Identify the power terminal block (ACIN) and signal terminal block (OUT). See Fig. 59 and 60. Using 20 AWG twisted wire pair, connect the 24 vac power to the terminal labeled ACIN.

Field Wiring

NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

Fig. 53 — Wiring of Device Under Discrete Output

Temperature Control

Field Wiring

NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and .25 power factor 125 va at 230 vac and .25 power factor

Fig. 54 — Wiring of Discrete Output Device

Under Timeclock Control

Field Wiring

Fig. 55 — Wiring of the Modulating Valve for

Analog Output Humidity Control

The 24 vac power source(s) to both duct mounted and wall mounted relative humidity transmitters MUST be isolated. Connecting either side to a ground will permanently damage the sensor.

The power for the relative humidity transmitters may be sourced from the valve 24 vac power source at wire no. 6 and 7 or at wire no. 4 and 5.

Connect the signal wires as follows: Secure one wire to the terminal labelled OUT (located at the right of terminal block OUT). Secure the other wire to the negative signal output terminal (terminal adjacent to the terminal labelled OUT ). Run the twisted pair of signal wires to the PIC control box. Observe all local code requirements.

Outdoor Relative Humidity Transmitter: Connect the positive ( ) wire to pin 31 of the processor module. Connect the negative (−) wire to pin 32 of the processor module.

Return Air or Space Relative Humidity Transmitter; Connect the positive ( ) wire to pin 10 of the processor module. Connect the negative (−) wire to pin 11 of the processor module. See Fig. 61.

Field Wiring

NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows:

48 va at 24 vac and .25 power factor 125 va at 115 vac and 25 power factor 125 va at 230 vac and .25 power factor

Fig. 56 — Wiring of Two-Stage Humidiﬁcation Control Relays

Field Wiring

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 57 — Wiring of the Duct

High Humidity Switch

Fig. 58 — Field-Installed Relative

Humidity Transmitters

Field Wiring

Fig. 59 — Duct Mounted Relative Humidity

Transmitter Wiring

Fig. 60 — Wall Mounted Relative Humidity

Transmitter Wiring

LEGEND

RH — Relative Humidity

Field Wiring

Fig. 61 — Wiring of Relative Humidity Transmitters

AIR QUALITY SENSOR — Air quality (AQ) sensors are CO2sensors shipped inside the fan section for ﬁeld installation. To wire the sensors after they are mounted in the conditioned air space and return air duct, see Fig. 62 and the instructions shipped with the sensors. For each sensor, use two 2-conductor 20 AWG twisted-pair cables (unshielded) to connect the separate 24 vac power source to the sensor and the sensor to the option module (PSIO slave) terminals. To connect each AQ sensor to the option module, identify the positive ( ) and negative (−) terminals on the sensor; connect AQ1 to terminals 25 and 26 and connect AQ2 to terminals 28 and 29.

OUTSIDE AIR VELOCITY PRESSURE (OAVP) SENSOR — The OAVP sensor is factory installed and wired. As shown in Fig. 62, the sensor’s power wiring is connected to TB2, 9 and 10 for 39L units or TB2, 29 and 30 for 39NX units; the signal leads are connected to terminals 31 and 32 in the option module.

FAN VOLUME CONTROL (Fig. 63) Airﬂow Monitoring Stations are ﬁeld-selected and ﬁeld-

installed in the supply and return air ducts; see Fig. 63. Install each monitoring station in a straight portion of the duct with any upstream or downstream elbows or ﬁttings at least 2.5 diameters away.

Use approved plenum tubing to connect each monitoring station to the bulkhead ﬁttings on top of the control box. For runs up to 50 ft, use

⁄4-in. OD tubing. For runs over 50 ft,

use3⁄8-in. OD tubing. DifferentialPressure Transducers for fan volume control are

factory-installed in the control box (two are supplied). The power supply for the transducers is also factory installed. Both transducers have pressure ranges of 0.0 to 1.0 in. wg and produce 2 to 10 vdc signals. See Fig. 64 for wiring details.

Note that if the velocity pressure of the supply and/or return air is below 0.75 in. wg, the system may require transducers with lower ranges than those of the default factorysupplied transducers. As a general rule, size transducers so that the maximum air velocity pressure is 75% of the transducer’s maximum value. For example, if the 39L or 39NX unit produces a maximum air velocity pressure of

0.15 in. wg, a transducer with a maximum value of

0.20 in. wg can be used. Sizing the transducers according to these guidelines ensures that they have good resolution.

Factory-Supplied Return Fans with Inlet Guide Vanes (IGVs) are factory wired except for the air supply control signal from the airﬂow monitoring stations, which is connected in the ﬁeld to the bulkhead ﬁtting.

Return Fans with Field-Supplied IGVActuators must be able to receivea4to20mAsignal and may NOT have an impedance of more than 600 ohms. An isolated power source must be ﬁeld-supplied and installed. See Table 9 for recommended actuators.

To install actuators, see Fig. 65. Using a 2-conductor 20AWG conductor cable (one twisted pair, unshielded) rated for the application, connect the positive ( ) wire to terminal 37 in the option module. Connect the negative (−) wire to terminal 38. Connect the 24 vac power leads to TB2, terminals 23 and 24.

Field-Supplied Return Fans with Variable Frequency Drives must have 4 to 20 mA signal input boards and their own ﬁeld-supplied and installed power sources.

To install return fans with variable frequency drives, see Fig. 66. Using a 2-conductor 20 AWG conductor cable (one twisted pair, unshielded) rated for the application, connect the positive ( ) signal wire to terminal 37 in the option module. Connect the negative signal (−) wire to terminal 38.

The supply fan minimum set point must be equal to the return fan minimum airﬂow, plus the delta airﬂow that is to be maintained.

LEGEND

AQ — Air Quality Sensor OAVP — Outside Air Velocity Pressure Sensor

Field Wiring Factory Wiring

NOTE: See unit label diagram or Fig. 12 for remote-mount control box connections.

Fig. 62 — Air Quality and OAVP Sensor Wiring

IGV — Inlet Guide Vane

Field Wiring

NOTE: Air monitoring stations are ﬁeld supplied and installed; pressure transducers are factory supplied and installed.

Fig. 63 — Field-Installed Fan Volume Control

LEGEND

RVP — Return Velocity Pressure Transducer SVP — Supply Velocity Pressure Transducer

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Field Tubing

Fig. 64 — Fan Volume Control — Differential Pressure Transducer (P/N HK05ZG007) Factory Wiring

Field Wiring

NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount control boxes.

Fig. 65 — Wiring of Return Fan Volume Control

with IGVs

Fig. 66 — Wiring of Return Fan Volume Control

with Variable Frequency Drive

Pulse-Type Meter (Fig. 67) — Monitors power usage, which is passed through the Carrier Comfort Network (CCN) for use by the loadshed module of the Building Supervisor. The meter must provide a dry contact signal (not exceeding 4 Hz maximum). Using a 2-conductor 20 AWG shielded twistedpair conductor cable, connect one wire to terminal 35 of the option module and the other wire to terminal 36. Connect the drain wire to the ground lug inside the PIC control box and remove the drain wire and shield on the meter end of the cable. Tape to insulate, if required.

ELECTRIC HEATER—The electric heater is factory wired and installed and is controlled by the PIC processor and DSIO. There is no ﬁeld wiring or installation required.

CARRIER COMFORT NETWORK INTERFACE — The Carrier Comfort Network (CCN) communication bus wiring is supplied and installed by the electrical contractor. It consists of shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication bus in a daisy-chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it; the negative pins must be wired to the negative pins; the signal ground pins must be wired to signal ground pins. See Fig. 68 for location of the CCN communication plug (COMM1) on the processor module.

NOTE: Conductors and drain wire must be 20 AWG minimum, stranded tinned copper.Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teﬂon, or polyethylene.An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teﬂon with a minimum operating temperature range of −20 C to 60 C is required. See Table below for cables that meet the requirements.

MANUFACTURER CABLE NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

When connecting the CCN communication bus to a system element, a color code system for the entire network is recommended to simplify installation and checkout. The following color code is recommended:

SIGNAL

TYPE

CCN BUS CONDUCTOR

INSULATION COLOR

COMM1 PLUG

PIN NO.

RED 1

Ground WHITE 2

− BLACK 3

If a cable with a different color scheme is selected, a simi-

lar color code should be adopted for the entire network.

At each system element, the shields of its communication bus cables must be tied together. If the communication bus is entirely within one building, the resulting continuous shield must be connected to ground at only one point. See Fig. 69. If the communication bus cable exits from one building and enters another, the shields must be connected to ground at the lightning suppressor in each building where the cable enters or exits the building (one point only).

To connect the 39L or 39NX unit to the network, proceed as follows (Fig. 69):

1. Turn power to the PIC control box to OFF.

2. Remove the COMM1 plug from the processor module.

3. Cut the CCN wire and strip the ends of the RED, WHITE,

and BLACK conductors.

4. Using a wire nut, connect the 2 drain wires together.

5. Insert and secure the 2 RED wires to terminal 1 of the

COMM1 plug.

6. Insert and secure the 2 WHITE wires to terminal 2 of the

COMM1 plug.

7. Insert and secure the 2 BLACK wires to terminal 3 of the

COMM1 plug.

OUTDOOR-AIR THERMOSTAT — Use ﬁeld-supplied, 2-conductor 20 AWG wire to connect the thermostat to the DSIO and terminal block in the PIC control box. See Fig. 70. Connect one wire between the thermostat and J3-1 on the DSIO. For 39NX units, connect a second wire between the other thermostat terminal and TB3-9 (TB2-10 for 39L units). For 39NX units, connect a third wire between J3-2 on the DSIO and TB4-10 (TB2-9 on 39L units).

CONTROL SYSTEM

The control system consists of a processor module (Fig. 71), sensors, and controlled devices. Available options include a processor option module (Fig. 71), relay modules (Fig. 72), and local interface device.

Field Wiring

Fig. 67 — Pulse-Type Meter Wiring

Fig. 68 — CCN Sensor Plug and Communication

Plug Locations

Fig. 69 — CCN Communication Wiring

All system software and operating intelligence is in the processor (PSIO master) module, which controls the unit. This module monitors and controls conditions through input and output ports and through the option (PSIO slave) and relay (DSIO) modules.

The machine operator communicates with the PSIO master through the local interface device (HSIO). Communications between the PSIO and other modules is accomplished by a 3-wire sensor bus that runs in parallel between modules. See Fig. 73.

On the sensor bus terminal strips, terminal 1 of the PSIO module is connected to terminal 1 of each of the other modules (see Fig. 73). Terminals 2 and 3 are connected in the same manner. If a terminal 2 wire is connected to terminal 1, the system does not work.

The PSIO master and slave and DSIO are all powered from a 21 vac power source connected to terminals 1 and 2 of the power input connector on each module. Refer to the 39L or 39NX unit wiring diagram for transformer locations and wiring.

Processor(PSIO Master)and Option(PSIO Slave) Modules (Fig. 71) —

tors and controls components such as the supply fan, cooling and heating coil valves, inlet guide vanes, and mixed-air dampers. The PSIO slave module provides additional inputs and outputs to the PSIO master for options such as return fan volume, humidiﬁer, smoke, and air quality control. The processor and option modules are factory installed.

Each PSIO input and output channel has 3 terminals; only 2 of the terminals are used. The unit application determines the terminal connections. Refer to the unit wiring diagram for terminal numbers.

The PSIO address switches are factory set at address 01 (master) and 31 (slave). Use a local or remote HSIO or the CCN to change the unit address. Do NOT change the address switches on the PSIO modules.

The PSIO master module moni-

Relay (DSIO) Module (Fig. 72) — The DSIO mod-

ule provides additional inputs and outputs to the PSIO master for electric heater and direct expansion coil staging. The DSIO module is factory installed. If only one DSIO module is used for electric heat or DX cooling, the DSIO address switches are factory-set at 19. If 2 DSIO modules are used for electric heat and DX cooling, the heat module is set to address 19 and the cooling module is set to address 49. See Table 1.

The DSIO inputs on strip J3 are discrete (ON/OFF) inputs. When 24 vac are applied across the 2 terminals, the corresponding channel reads one state. When no power is applied across the terminals, the channel reads the opposite state.

IMPORTANT: The 24 vac inputs on J3 of the DSIO module are polarized, with one side tied to earth ground. The grounded side of the signal must be connected to the even-number pins.

Terminal strips J4 and J5 are internal relays whose coils are powered on and off by a signal from the microprocessor. The relays switch the circuit to which they are connected. Only Class II power should be applied to these connections.

IMPORTANT: Use only the normally-open contacts on DSIO modules. These contacts have internal snubbers that protect the control modules from destructive arcing produced by switching inductive loads. NEVER use the normally-closed contacts.

LEGEND

AHU — Air Handling Unit CUST — Condensing Unit Status DSIO — Relay Module DX — Direct Expansion OAT — Outdoor Air Thermostat PIC — Product Integrated Control

Factory Wiring Field Wiring

Fig. 70 — Outdoor Air Thermostat/DSIO Wiring

Local Interface Device (HSIO) (Fig. 74) — The

HSIO consists of a keyboard with 6 function keys, 5 operative keys, 10 numeric keys (0-9), and an alphanumeric 8-character liquid crystal display (LCD). Key use is explained in Table 10. Each function has one or more subfunctions as shown in Table 11. These functions are described in greater detail in the Control Operation section of this book. The HSIO can be factory-or ﬁeld-installed, and can be remotely mounted if necessary.

Table 10 — Local Interface Device Key Usage

FUNCTION

KEYS

OPERATIVE

KEYS

USE

Status — Display diagnostic codes and current operating information about the machine

Quick Test — Check inputs and outputs for proper operation

History — Check latest service dates and alarms in order of occurrence

Service — Enter speciﬁc unit conﬁguration information

Set Point — Enter operating set points and day/time/date, holiday, and daylight savings time information

Schedule — Enter occupied/unoccupied schedules for unit operation

USE

Expand Display — Display a non-abbreviated expansion of the display

Clear — Clear the screen of all displays Up Arrow — Return to previous display position

Down Arrow — Advance to next display position

Enter data

Fig. 72 — Relay Module (DSIO)

Fig. 71 — Processor Module (PSIO Master/Slave)

LID — Local Interface Device

Fig. 73 — Sensor Bus Wiring (Communications)

Fig. 74 — Local Interface Device

Table 11 — Functions and Subfunctions

SUB-

FUNCTION

NUMBER

1 Current alarms Alarm history Occupied mode 2 Current operating 3 Current operating 4 System inputs — Period 3 5 System outputs — Period 4 6 — — Period 5 7— — Period 6 8— — Period 7

9— — Period 8 10 — — Occupied mode 11 — — Period 1 12 — — Period 2 13 — — Period 3 14 — — Period 4 15 — — Period 5 16 — — Period 6 17 — — Period 7 18 — — Period 8 19 — — — Loadshed 20 — — — Fan tracking 21 — — — Humidity 22 — — — Alarms limits 23 — — — Analog temperature 24 — — — Discrete temperature 25 — — — Service history 26 — — — Service maintenance 27 — — — Timed override

DX — Direct Expansion

Status History Schedule Service Set Point Test

override sched 1 modes set points

Maintenance history

— Period 2

Period 1

of schedule 1

override sched 2

of schedule 2

FUNCTION

Log on and Log off

Software version

Factory conﬁguration

English/metric system

User conﬁguration

Heating coil conﬁguration

Cooling coil conﬁguration

DX cooling conﬁguration

Inlet guide vanes conﬁguration

Mixed-air damper conﬁguration

Electric heat conﬁguration

Nighttime free cooling conﬁguration

Night purge conﬁguration

OAVP conﬁguration

Air quality conﬁguration 1

Air quality conﬁguration 2

Optimal start/stop conﬁguration

Space temperature reset conﬁguration

conﬁguration conﬁguration conﬁguration conﬁguration conﬁguration conﬁguration conﬁguration conﬁguration history

System set points Quick test of Demand limits Quick test of Current time Quick test of Daylight savings

time conﬁguration Holiday

conﬁguration ——

—— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— ——

inputs outputs electric heat

Quick test of DX cooling

Exit quick test

CONTROL OPERATION

Accessing Functions and Subfunctions —

See Table 12. Refer also to Table 11, which shows the 6 functions (identiﬁed by name) and the subfunctions (identiﬁed by number). Table13 shows the sequence of all the elements in a subfunction.

Table 12 — Accessing Functions and Subfunctions

OPERATION KEYBOARD

To access a function, press the subfunction number and the function name key. The display shows the subfunction group

To move to the other elements, scroll up or down using the arrow keys

When the last element in a subfunction has been displayed, the ﬁrst element is repeated

To move to the next subfunction, it is not necessary to use the subfunction number. Pressing the function name key advances the display through all subfunctions within a function and then back to the ﬁrst

Display Functions

SUMMARY DISPLAY — Whenever the keyboard has not been used for 10 minutes, the display automatically switches to an alternating summary display. This display has 3 parts (day/time, mode, and alarms), shown below, which alternate in continuously rotating sequence.

Display Expansion TUE 12:45 TODAY IS TUE, TIME IS 12:45

MODE 23 UNOCCUPIED HEATING 2 ALARMS THERE ARE 2 ALARMS DETECTED

Return to the previous display at any time by pressing

ENTRY

DISPLAY DESCRIPTION

SETPOINT System set points

OHSP X Occupied heating set point OCSP X Occupied cooling set point UHSP X Unoccupied heating set point UCSP X Unoccupied cooling set point

DEMAND Demand limit set points

TIME

DAYLIGHT Daylight savings time

Time of day and day of week display

To move to another function, either depress the function name key for the desired function (display shows the ﬁrst subfunction)

Access a particular subfunction by using the subfunction number and the function name key

HOLIDAY Holiday display

SETPOINT System set points

X ALARMS X alarms detected

SETPOINT Current operating set points

Table 13 — Keyboard Directory

STATUS

Keyboard Entry Display Description

ALARMS Current alarm display ALARM X 1st alarm ALARM X 2nd alarm ALARM X 3rd alarm ALARM X 4th alarm ALARM X 5th alarm ALARM X 6th alarm ALARM X 7th alarm ALARM X 8th alarm ALARM X 9th alarm ALARM X 10th alarm ALARM X 11th alarm ALARM X 12th alarm ALARM X 13th alarm ALARM X 14th alarm ALARM X 15th alarm ALARM X 16th alarm ALARM X 17th alarm ALARM X 18th alarm ALARM X 19th alarm ALARM X 20th alarm ALARM X 21st alarm ALARM X 22nd alarm ALARM X 23rd alarm ALARM X 24th alarm ALARM X 25th alarm ALARM X 26th alarm ALARM X 27th alarm ALARM X 28th alarm ALARM X 29th alarm ALARM X 30th alarm ALARM X 31st alarm ALARM X 32nd alarm

STATUS

Keyboard Entry Display Description

MODES Current operating modes MODE X Mode 1 MODE X Mode 2

SETPOINT Current operating set points

OHSP X Occupied heating set point OCSP X Occupied cooling set point

UHSP X Unoccupied heating set point

UCSP X Unoccupied cooling set point

SPSP X Static pressure set point

SASP X Supply air set point

CFSP X Delta CFM set point

HUSP X Humidity set point

AOSP X Analog temperature control set point DOSP X Discrete temperature control set point

Q1SP X Air quality 1 set point

Q2SP X Air quality 2 set point

OASP X

Outdoor air velocity pressure set point

Table 13 — Keyboard Directory (cont)

STATUS

Keyboard Entry Display Description

INPUTS System inputs

SPT X Space temperature SAT X Supply air temperature RAT X Return air temperature OAT X Outside air temperature OAT X Outside air temperature forced

SP X Static pressure

SFS X Supply fan status ENT X Enthalpy switch status ENT X Enthalpy switch status forced

RH X Relative humidity RH X Relative humidity forced

FRZ X Freezestat status MAT X Mixed air temperature

OARH X Outside air relative humidity OARH X Outside air relative humidity forced

FLTS X Filter status FLTS X Filter status forced

TEMP X Temperature input

RVP X Return velocity pressure SVP X Supply velocity pressure DHH X Duct high humidity

EVAC X Evacuation PRES X Pressurization PURG X Smoke purge

FSD X Fire shutdown

MTR X Meter OAVP X Outdoor air velocity pressure OAVP X Outdoor air velocity pressure

AQ1 X Air quality 1

AQ2 X Air quality 2

CUST X Condensing unit status CUST X Condensing unit status

DXSD X DX cooling shutdown DXSD X DX cooling shutdown

OUTPUTS System outputs

IGV X Inlet guide vanes

DX — Direct Expansion

(x = forced value)

STATUS

Keyboard Entry Display Description

IGV X MIXD X Mixed air damper MIXD X

HCV X Heating coil valve HCV X CCV X Cooling coil valve CCV X

SF X Supply fan start/stop

SF X HIR X Heat interlock relay HIR X

EHS1 X Electric heat stage 1 EHS2 X Electric heat stage 2 EHS3 X Electric heat stage 3 EHS4 X Electric heat stage 4 EHS5 X Electric heat stage 5 EHS6 X Electric heat stage 6 EHS7 X Electric heat stage 7

EHS8 X

RFVC X Return fan volume RFVC X HUM1 X Humidiﬁer ﬁrst stage HUM1 X HUM2 X Humidiﬁer 2nd stage HUM2 X AOTC X Analog temperature AOTC X DOTC X Discrete temperature DOTC X DTCC X Discrete time clock DTCC X DXS1 X DX cooling stage 1

DXS2 X DX cooling stage 2 DXS3 X DX cooling stage 3 DXS4 X DX cooling stage 4 DXS5 X DX cooling stage 5 DXS6 X DX cooling stage 6 DXS7 X DX cooling stage 7 DXS8 X DX cooling stage 8

Inlet guide vanes forced (x = forced value)

Mixed air damper forced (x = forced value)

Heating coil valve forced (x = forced value)

Cooling coil valve forced (x = forced value)

Supply fan start/stop forced (x = forced value)

Heat interlock relay forced (x = forced value)

Electric heat stage 8 (NOTE: Only the actual number of heater stages applicable to the unit are provided.)

Return fan volume forced (x = forced value)

Humidiﬁer ﬁrst stage forced (x = forced value)

Humidiﬁer 2nd stage forced (x = forced value)

Analog temperature forced (x = forced value)

Discrete temperature forced (x = forced value)

Discrete time clock forced (x = forced value)

Table 13 — Keyboard Directory (cont)

SCHEDULE

Keyboard Entry Display Description

OVRD X Number of hours to extend

PERIOD 1 Deﬁne period 1 of time

OCC X Start of occupied time UNO X Start of unoccupied time MON X Monday ﬂag (x = entry code)

TUE X Tuesday ﬂag (x = entry code)

WED X Wednesday ﬂag (x = entry code)

THU X Thursday ﬂag (x = entry code)

FRI X Friday ﬂag (x = entry code)

SAT X Saturday ﬂag (x = entry code)

SUN X Sunday ﬂag HOL X Holiday ﬂag

OVRD X Number of hours to extend

PERIOD 1 Deﬁne period 1 of time

OCC X Start of occupied time UNO X Start of unoccupied time MON X Monday ﬂag (x = entry code)

TUE X Tuesday ﬂag (x = entry code)

WED X Wednesday ﬂag (x = entry code)

THU X Thursday ﬂag (x = entry code)

FRI X Friday ﬂag (x = entry code)

SAT X Saturday ﬂag (x = entry code)

SUN X Sunday ﬂag HOL X Holiday ﬂag

CV — Constant Volume DX — Direct Expansion VAV — Variable Air Volume

(same elements as period 1, schedule 1)

(same elements as period 1, schedule 2)

occupied mode of schedule 1

schedule 1

(1 = yes, .0 or CLR = no)

Time periods 2-8 of schedule 1

occupied mode of schedule 2

schedule 2

(1 = yes, .0 or CLR = no)

Time periods 2-8 of schedule 2

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

LOG ON Enter password to log on LOGGEDON Log on okay

When ﬁnished with conﬁguration, log off as follows:

LOGGEDON LOG OFF LOGD OFF

VERSION Software version XXX-XX-X Software version number

FACT CFG Factory conﬁguration TYPE X Unit type (0 = CV,1=VAV) COOL X Cooling (0 = none, 1 = coil) DXST X

HEAT X

EHST X MIXD X IAQT X Indoor-air quality type

MATP X Mixed air temperature protection BUS X ADR X PSW X Password XXXX

UNITS X

USER CFG User conﬁguration NTEN X HUEN X Humidity conﬁguration OHEN X Occupied heating conﬁguration RSEN X DLEN X Demand limiting conﬁguration FTEN X Fan tracking conﬁguration OAEN X Constant outside air NPEN X Night purge AQEN X Indoor air quality IAQP X Indoor air quality priority level OSEN X Optimal start/stop conﬁguration TSCH X Timed override schedules TOVR X Timed override values

HEATCOIL Conﬁguration of heating coil MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value FOV X Fan off value SMR X Submaster reference value SMR X Submaster reference value forced

Shows that conﬁgurations are available

Log off okay; conﬁgurations again password protected

DX cooling stages 0-8 (enter number)

Heating (0 = none, 1 = hot/steam, 2 = electric heat coil)

Electric heat stages 0-8 (enter number)

Mixed air damper (0 = none, 1 = yes, 2 = 2-position)

Bus number (factory default set=0)

Element address (factory set default = 1)

English/metric system (0 = English, 1 = metric)

Nighttime free cooling conﬁguration

Space temperature reset conﬁguration

Table 13 — Keyboard Directory (cont)

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

COOLCOIL MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value HHL X High humidity limit SMR X Submaster reference value SMR X Submaster reference value forced

DXCOOL Conﬁgure DX cooling SMG X Submaster gain SMG X Submaster gain forced MSR X Minimum submaster reference DX1G X Stage 1 Time GuardT device DX2G X Stage 2 Time Guard DX3G X Stage 3 Time Guard DX4G X Stage 4 Time Guard DX5G X Stage 5 Time Guard DX6G X Stage 6 Time Guard DX7G X Stage 7 Time Guard DX8G X Stage 8 Time Guard DX1T X Stage 1 logic type DX2T X Stage 2 logic type DX3T X Stage 3 logic type DX4T X Stage 4 logic type DX5T X Stage 5 logic type DX6T X Stage 6 logic type DX7T X Stage 7 logic type DX8T X Stage 8 logic type

INLET GV Conﬁguration of inlet guide vanes MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value SMR X Submaster reference value SMR X Submaster reference value forced

DX — Direct Expansion OAVP — Outside Air Velocity Pressure

Conﬁguration of cooling (chilled water coil or DX)

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

MIXADMPR Conﬁguration of mixed air damper MPG X Master proportional gain

MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value MDP X Minimum damper position SMR X Submaster reference value SMR X Submaster reference value forced DPSP X Damper set point DPSP X Damper set point forced OAE X Outside air enthalpy RAE X Return air enthalpy CNTRL X Damper controlled by

ELECHEAT Conﬁguration of electric heat MPG X Master proportional gain

MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SMR X Submaster reference value SMR X Submaster reference value forced

NTFC

NTLO X

NPURGE Conﬁguration of night purge NPMN X Night purge duration

NPDL X NPDH X MDP X Minimum damper position

OAC

MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SMG X Submaster gain forced OALV X OAVP sensor low voltage point OAHV X OAVP sensor high voltage point OALR X OAVP sensor low voltage reference OAHR X OAVP sensor high voltage reference PMF X OAVP sensor probe multiplier factor MDP X Minimum damper position SMR X Submaster reference value SMR X Submaster reference value forced

Conﬁguration of nighttime free cooling (NTFC) NTFC lockout temperature (minimum outside air temperature to operate NTFC)

Night purge low temperature damper position

Night purge high temperature damper position

Conﬁguration of constant outside air

Table 13 — Keyboard Directory (cont)

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

AIRQUAL1

MPG X Master proportional gain MIG X Master integral gain XDP X Maximum damper position Q1LV X Q1HV X Q1LR X Q1HR X MDP X Minimum damper position

AIRQUAL2

MPG X Master proportional gain MIG X Master integral gain XDP X Maximum damper position Q2LV X Air quality sensor 2 low voltage point Q2HV X Air quality sensor 2 high voltage point Q2LR X Air quality sensor 2 low voltage reference Q2HR X Air quality sensor 2 high voltage reference MDP X Minimum damper position

AOSS X Conﬁguration of optimal start/stop BLDF X Building factor UOCF X 24 hour occupied factor SETB X Set point bias OSMT X Maximum allowable stop time

SPRESET Conﬁguration of space temperature reset RTIO X Reset ratio X LIMT X Reset limit X

LOADSHED Conﬁguration of loadshed LSGP X Loadshed group number (1-16)

FANTRACK Conﬁguration of fan tracking SVUL X Supply velocity upper limit RVUL X Return velocity upper limit SDAR X Supply duct area RDAR X Return duct area MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value SMR X Submaster reference value

SMR X Submaster reference value forced

Conﬁguration of indoor air quality and AQ sensor no. 1

Air quality sensor 1 low voltage point

Air quality sensor 1 high voltage point

Air quality sensor 1 low voltage reference

Air quality sensor 1 high voltage reference

Conﬁguration of indoor air quality and AQ sensor no. 2

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

HUMIDITY Conﬁguration of humidity MPG X Master proportional gain MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value SMR X Submaster reference value

SMR X Submaster reference value forced

ALRMLIMT Conﬁguration of alarm limits SPLO X SPHO X SPLU X SPHU X SALO X SAHO X SALU X SAHU X RALO X RAHO X RALU X RAHU X TLO X THO X TLU X THU X OATL X Outside air temperature low alarm limit OATH X Outside air temperature high alarm limit MATL X Mixed air temperature low alarm limit MATH X Mixed air temperature high alarm limit RHL X Relative humidity low alarm limit RHH X Relative humidity high alarm limit ORHL X ORHH X SPL X Static pressure low alarm limit SPH X Static pressure high alarm limit SVPL X Supply velocity pressure low alarm limit SVPH X Supply velocity pressure high alarm limit RVPL X Return velocity pressure low alarm limit RVPH X Return velocity pressure high alarm limit CFML X Delta CFM x 100 low alarm limit CFMH X Delta CFM x 100 high alarm limit Q1H X Air quality sensor 1 high alarm limit Q2H X Air quality sensor 2 high alarm limit

Space temperature low alarm limit/ occupied

Space temperature high alarm limit/ occupied

Space temperature low alarm limit/ unoccupied

Space temperature high alarm limit/ unoccupied

Supply air temperature low alarm limit/ occupied

Supply air temperature high alarm limit/ occupied

Supply air temperature low alarm limit/ unoccupied

Supply air temperature high alarm limit/ unoccupied

Return air temperature low alarm limit/ occupied

Return air temperature high alarm limit/ occupied

Return air temperature low alarm limit/ unoccupied

Return air temperature high alarm limit/ unoccupied

Temperature input low alarm limit/ occupied

Temperature input high alarm limit/ occupied

Temperature input low alarm limit/ unoccupied

Temperature input high alarm limit/ unoccupied

Outside air relative humidity low alarm limit

Outside air relative humidity high alarm limit

Table 13 — Keyboard Directory (cont)

SERVICE CONFIGURATIONS

Keyboard Entry Display Description

AO CTRL MPG X Master proportional gain

MIG X Master integral gain MDG X Master derivative gain SMG X Submaster gain SCV X Submaster center value FOV X Fan off value SEN X Controlling temperature sensor SMR X Submaster reference value SMR X Submaster reference value forced

DO CTRL Conﬁguration of discrete output control SEN X Controlling temperature sensor TYP X Discrete output logic type HYS X Hysteresis

SERVHIST Service history SDAY X Number of starts in the last 24 hours STX Total number of starts FH X Total number of fan run hours DOW HH:MM Day of week and time of the last Start DOW HH:MM Day of week and time of the last Stop

SRV/MTN SMAL X

SMEH X

OVRDHIST History of timed overrides OHR X Hours of timed overrides

Conﬁguration of analog temperature/ preheat coil control

Conﬁguration of service/maintenance alarms

Service/maintenance alarm limit (hours x 1000)

Service/maintenance elapsed hours (hours x 1000)

SET POINT

Keyboard Entry Display Description

SETPOINT System set points OHSP X Occupied heating set point OCSP X Occupied cooling set point UHSP X Unoccupied heating set point UCSP X Unoccupied cooling set point SPSP X Static pressure set point SASP X Supply air set point CFSP X Delta CFM set point HUSP X Humidity set point AOSP X Analog temperature control set point DOSP X Discrete temperature control set point Q1SP X Air quality 1 set point Q2SP X Air quality 2 set point OVSP X Outside air velocity pressure set point

DEMAND Demand limit set points DL1 X Demand limit set point 1 DL2 X Demand limit set point 2

TIME Conﬁguration of current time and date DAY.HH.MM Current day of the week and time MM.DD.YY Current date

DAYLIGHT Conﬁguration of daylight savings time ENM X Daylight savings time starts—month END X Daylight savings time starts—day ENT X Daylight savings time starts—time LVM X Daylight savings time ends—month LVD X Daylight savings time ends—day LVT X Daylight savings time ends—time

HOLIDAY Conﬁguration of holidays MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR MM.DD.DUR

Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long) Holiday month, day & duration (days long)

Table 13 — Keyboard Directory (cont)

QUICK TEST

Keyboard Entry Display Description

INPUTS Factory/ﬁeld test of inputs SAT X Supply air temperature OAT X Outside air temperature SPT X Space temperature RAT X Return air temperature ENT X Enthalpy switch status SFS X Airﬂow switch status FRZ X Freezestat SP X Static pressure RH X Return air relative humidity MAT X Mixed air temperature OARM X Outside air relative humidity FLTS X Filter status TEMP X Temperature input RVP X Return velocity pressure SVP X Supply velocity pressure DHH X Duct high humidity EVAC X Evacuation PRES X Pressurization PURG X Smoke purge FSD X Fire shutdown MTR X Wattmeter OAVP X Outside air velocity pressure AQ1 X Air quality 1 AQ2 X Air quality 2 CUST X Condensing unit status DXSD X DX cooling shutdown

QUICK TEST

Keyboard Entry Display Description

OUTPUTS Factory/ﬁeld test of outputs HCV X Entering heating coil valve test HCV TEST Testing heating coil valve CCV X Entering cooling coil valve test CCV TEST Testing cooling coil valve MIXD X Entering mixed air damper test MIXD TEST Testing mixed air dampers IGV X Entering inlet guide vanes test IGV TEST Testing inlet guide vanes SF X Entering supply fan test FAN TEST Testing supply fan HIR X Entering heat interlock relay test HIR TEST Testing heating interlock relay RFVC X Entering return fan volume test RFVCTEST Testing return fan volume HUM1 X Entering humidifer stage 1 test HUM1TEST Testing humidifer stage 1 HUM2 X Entering humidiﬁer stage 2 test HUM2TEST Testing humidiﬁer stage 2 AOTC X AOTCTEST DOTC X DOTCTEST DTCC X DTCCTEST

Entering analog temperature control output test

Testing analog temperature control output

Entering discrete temperature control output test

Testing discrete temperature control output

Entering discrete time clock control output test

Testing discrete time clock control output

DX — Direct Expansion

Table 13 — Keyboard Directory (cont)

QUICK TEST

Keyboard Entry Display Description

ELE HEAT Factory/ﬁeld test of electric heat EHS1 X Stage 1 test STG1 TST Testing of electric heat stage 1 EHS2 X Stage 2 test STG2 TST Testing of electric heat stage 2 EHS3 X Stage 3 test STG3 TST Testing of electric heat stage 3 EHS4 X Stage 4 test STG4 TST Testing of electric heat stage 4 EHS5 X Stage 5 test STG5 TST Testing of electric heat stage 5 EHS6 X Stage 6 test STG6 TST Testing of electric heat stage 6 EHS7 X Stage 7 test STG7 TST Testing of electric heat stage 7 EHS8 X Stage 8 test STG8 TST Testing of electric heat stage 8

HISTORY

Keyboard Entry Display Description

ALARMHST Alarm history ALARM X Latest alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm ALARM X Previous alarm

MTMN/HIS Maintenance history MM.DD.YY Latest service date

DXCOOL Factory/ﬁeld test of DX cooling DXS1 X Stage 1 test STG1TEST Testing DX cooling stage 1 DXS2 X Stage 2 test STG2TEST Testing DX cooling stage 2 DXS 3 X Stage 3 test STG3TEST Testing DX cooling stage 3 DXS4 X Stage 4 test STG4TEST Testing DX cooling stage 4 DXS5 X Stage 5 test STG5TEST Testing DX cooling stage 5 DXS6 X Stage 6 test STG6TEST Testing DX cooling stage 6 DXS7 X Stage 7 test STG7TEST Testing DX cooling stage 7 DXS8 X Stage 8 test STG8TEST Testing DX cooling stage 8

EXIT TEST Exit quick test TST CMPL Test completed

DX — Direct Expansion

STATUS FUNCTION — The status function shows the current status of alarm (diagnostic) codes, operating modes, set points, all measured system temperatures, output values, and input values. These subfunctions are deﬁned on pages 78-80. Refer to Table 11 for additional information.

(Alarms) — Alarms are messages that one or more

faults have been detected. Each fault is assigned a code number which is reported with the alarm. (See Table 14 for code deﬁnitions.) The codes indicate failures that cause the unit to shut down, terminate an option (such as reset), or result in the use of a default value as the set point.

Up to 32 alarm codes can be stored at once. To view

them in numerical sequence, press to enter the alarm display and then press to move to the individual

alarm displays. Press after a code has been displayed and the meaning of the code will scroll across the screen.

See Example 1.

If an input or output point which has generated an alarm resets (returns to a range within its limits), the alarm code is deleted from the list.

A historical sequence of the last 9 alarms can be found using the key. See Display Functions, History Func-

tion section for more details.

-----------------------------------------------(Modes) — The operating mode codes are dis-

played to indicate the current operating status of the unit. (See Table 14)

To enter the MODES subfunction, press and use the key to determine if more than one mode applies.

See Example 2 to read current mode with expansion.

Example 1 — Reading Alarm Codes

KEYBOARD

ENTRY

DISPLAY

RESPONSE

TUE 12:45 MODE 23 3 ALARMS

3 ALARMS 3 alarms detected ALARM 71 First alarm code

SPACE TEMPERATURE

LOW LIMIT ALARM 76 Second alarm code

RETURN AIR TEMPERATURE

HIGH LIMIT ALARM 83 Third alarm code

RELATIVE HUMIDITY LOW LIMIT

Keyboard has not been used for at least 10 minutes; alternating summary display appears on screen

Explanation of alarm code

COMMENTS

The modes are explained below: Temperature Reset (21) — Indicates that the unit is using

temperature reset to adjust the supply-air set point. The set point is modiﬁed based on space temperature (VAV units only). Unit must be conﬁgured for space temperature

reset ( ). (This mode is enabled by .) Demand Limit (22) — On CV (constant volume) units, this

mode indicates that the fan is being held off by the Demand Limit option. On VAV units, it indicates that the maximum IGV position is being limited by the Demand Limit option. Units must be conﬁgured for demand limiting

( ). This mode is enabled by , and is only available on units connected to the Carrier Comfort

Network (CCN). Unoccupied Heating (23) — Indicates that the space tem-

perature is below the Unoccupied Heating set point and the unit is on. When the space temperature rises above the set point the unit is turned off.

Unoccupied Cooling (24) — Indicates that the space temperature is above the Unoccupied Cooling set point and the unit is on. When the space temperature falls below the set point the unit is turned off.

Optimal Start (26) — Indicates that the unit is operating in the Optimal Start mode and is trying to achieve the Occupied set point. On VAV units this is referred to as morning warm-up. Unit must be conﬁgured for optimal start

( ). This mode is enabled by .) Unoccupied Mode (27) — Indicates that the unit is in the

Unoccupied mode as determined by its time schedule. In this mode the unit is turned off.

Optimal Stop (29) — Indicates that the unit is being controlled to its expanded Occupied set points. The space temperature is allowed to drift to its expanded Occupied set points during the last portion of the Occupied period.

Unit must be conﬁgured for Optimal Start ( ). Optimal Stop mode is only applicable to CV units.

Occupied Heating (30) — Indicates that the unit is in the Heating mode to satisfy its Occupied Heating set point.

Units must be conﬁgured for Occupied Heating

().

Occupied Heating is available on VAV units only.

Example 2 — Reading Current Operating Modes

KEYBOARD

ENTRY

DISPLAY

RESPONSE

TUE 12:45 MODE 31

MODE MODE 31 Mode 31 is in effect OCCUPIED COOLING Explanation of code 31

COMMENTS

Keyboard has not been used for at least 10 minutes; alternating summary display appears on screen.

Modes subfunction of status function

MODE 22 Mode 22 is in effect DEMAND LIMIT Explanation of code 22

NOTE: The ﬁrst mode is the primary operating mode. The second mode is the secondary operating mode, if applicable.

Occupied Cooling (31) — Indicates that the unit is in the Cooling mode to satisfy its Occupied Cooling set point.

Occupied Fan Only (32) — Indicates that the unit is maintaining set point by using a mixture of outside and return air only. No mechanical heating or cooling is being used.

Nighttime Free Cooling (33) — Indicates that the supply fan is on and using outside air to precool the space served by the unit. Unit must be conﬁgured for nighttime free cool-

ing ( ). (This mode is enabled by .) Smoke Pressurization (34) — Indicates that the unit is in the

Pressurization mode. This mode is issued from the ﬁre system panel. Refer to Table 15 for the state of the items controlled.

Smoke Evacuation (35) — Indicates that the unit is in the Smoke Evacuation mode. This mode is issued from the system panel. Refer to Table 15 for the state of the items controlled.

Smoke Purge (36) — Indicates that the unit is in the Smoke Purge mode. This mode is issued from the ﬁre system panel. Refer to Table 15 for the state of the items controlled.

Fire Shutdown (37) — Indicates that the unit is in the Fire Shutdown mode. This mode is issued from the ﬁre system panel or local smoke detector. Refer to Table 15 for the state of the items controlled.

Quick Test (38) — Indicates that the unit is in the Quick Test mode. It allows the user to test all inputs and outputs connected to the PIC controller. All control routines are deactivated when the unit is in this mode. This mode can only be initiated manually when the supply fan status is OFF. (HOA switch is in OFF position.) In order to reactivate all

the conﬁgured control routines, press and then press

Timed Override (39) — Indicates that the unit operation has been extended by the user. Unit must be conﬁgured for

TimedOverride schedule and timed override hours ( ).

Table 14 — Display Codes

FORCE STATES

Display Description

1 Fire mode force 2 Internal safety force 3 Quick Test/Service tool force 4 HSIO/Building Supervisor force 5 Remote Building Supervisor force 6 Loadshed minimum offtime force 7 Data transfer force 8 BEST (Building Environmental Systems

Translator) force

9 Temperature override force

10 Loadshed force

OPERATING MODES

Display Description

21 Temperature Reset in effect 22 Demand Limit in effect 23 Unoccupied Heating mode 24 Unoccupied Cooling mode 26 Optimal Start mode 27 Unoccupied mode 29 Optimal Stop mode 30 Occupied Heating mode 31 Occupied Cooling mode 32 Occupied Fan Only mode 33 Nighttime Free Cooling mode 34 Pressurization mode 35 Evacuation mode 36 Smoke Purge mode 37 Fire Shutdown mode 38 Quick Test mode 39 Timed Override mode

ALARMS

Display Description

60 Air quality 1 high limit 61 Air quality 2 high limit 62 Air quality/constant outside air suspended 63 (Not used) 64 DX cooling shutdown 65 Pressurization 66 Evacuation 67 Smoke purge 68 Fire shutdown 69 Service/maintenance required 70 Linkage failure 71 Space temperature low limit 72 Space temperature high limit 73 Supply-air temperature low limit 74 Supply-air temperature high limit 75 Return-air temperature low limit 76 Return-air temperature high limit 77 Mixed-air temperature low limit 78 Mixed-air temperature high limit 79 Outside-air temperature low limit 80 Outside-air temperature high limit 81 Static pressure low limit 82 Static pressure high limit 83 Relative humidity low limit 84 Relative humidity high limit 85 Fan status 86 Freezestat 87 Analog temperature control sensor low limit 88 Analog temperature control sensor high limit 89 Outside-air relative humidity low limit 90 Outside-air relative humidity high limit 91 Supply velocity pressure low limit 92 Supply velocity pressure high limit 93 Return velocity pressure low limit 94 Return velocity pressure high limit 95 Delta CCFM low limit 96 Delta CCFM high limit 97 Filter status 98 Duct high humidity

CCFM — Cfm x 100

Table 15 — State of Items Controlled

MODE (DISPLAY

CODE)

Pressurization (34) Off On Open Close Close Open to

Purge (36) On On Open Close Open Open to

Evacuation (35) On Off Close Close Open Close Open Off Off Fire Shutdown (37) Off Off Close Open Close Close Close Off Off

(Set point) — This subfunction displays the current

operating system set points.

To view set points, depress , then use the key

to display the occupied heat set point. Continue to depress

to display all the various system set points. Table 13

shows the order of the various set points.

------------------------------------------------

RETURN

FAN

SUPPLY

FAN

OUTDOOR-

AIR

DAMPER

RETURN-

AIR

DAMPER

EXHAUST

DAMPER

------------------------------------------------

SUPPLY FAN

INLET GUIDE

VANES (IGV)

Static Pressure

Set Point

Static Pressure

Set point

RETURN FAN IGV

Close On Off

Open to

B D cfm

HEAT

INTERLOCK

RELAY

On Off

ELECTRIC HEAT ALL

STAGES

(Outputs) — The output subfunction displays or

forces the output value percentage of the inlet guide vanes, mixed air damper and heating and cooling valves. It also displays or forces the ON/OFF status of the supply fan and heat interlock relay,displays the status of electric heat stages, and displays optional output status for return fan volume control, analog output temperature control, discrete output temperature control, discrete output time clock, and humidiﬁer

(Inputs) — The inputs subfunction displays the read-

ings at the various temperature sensors, fan status, static pressure sensors, enthalpy switch, and freezestat. It also allows the outside-air temperature sensor, enthalpy switch, returnair relative humidity sensor, outside-air relative humidity sensor, and ﬁlter status to be forced to a user deter-

stages.

To read a system output value, enter , then scroll

to the desired output using the key. To force a system output value, see Example 4. Table 13 shows the order of

the output values.

mined value or status. The forced value overrides the value that the control system actually reads. This permits operation in the event of a faulty sensor.

To read a sensor, enter , then scroll to the de-

sired sensor reading using the key. To force an input, see Example 3. Table 13 shows the order of the readouts.

Example 3 — Forcing An Input Value

KEYBOARD

ENTRY

8 0

DISPLAY

RESPONSE

INPUTS System inputs

Scroll past:

SPT X Space temperature SAT X Supply air temperature RT X Return air temperature MAT X Mixed air temperature OAT 60 Outside air temperature

Outside air temperature value

OAT 80/FORCED

OAT 60

forced to 80. NOTE: Forced value toggles between value and word forced

Outside air temperature forced value removed. Display no longer ﬂashes

COMMENTS

Example 4 — Forcing An Output Value

KEYBOARD

ENTRY

DISPLAY

RESPONSE

OUTPUTS System Outputs

Scroll past:

IGV X Inlet guide vanes MIXD X Mixed air damper HCV X Heating coil valve CCV X Cooling coil valve SF OFF Supply fan off

Supply fan forced ON.

SF ON/FORCED

SF OFF

NOTE: Supply fan forced value toggles between value (SF ON) and word FORCED

Supply fan forced value removed. Display no longer ﬂashes

COMMENTS

HISTORY FUNCTION

— Displays the 9 latest alarms generated by the

unit in the order of their occurrence. If 9 alarms are displayed, the occurrence of a 10th alarm shifts the ﬁrst alarm off the display.

------------------------------------------------

— Displays the latest service date on the local in-

terface device. The last 2 service dates are displayed at the Building Supervisor.

TEST FUNCTION — The test function operates the Quick Test diagnostic program.

— Displays the status of all inputs.

-----------------------------------------------— Tests the outputs.

-----------------------------------------------— Tests the electric heaters. Unit must be conﬁg-

ured for electric heat to access this subfunction. See Example 5.

-----------------------------------------------— Tests the stages of direct expansion (DX) cool-

ing. Unit must be conﬁgured for DX cooling to access this subfunction.

-----------------------------------------------— Takes the unit out of Quick Test.

------------------------------------------------

NOTE: The unit must not be operating during the Quick Test function. Set HOA switch to OFF and follow the test procedure. Set HOA switch to AUTO only as required during testing.

To reach a particular test, enter its subfunction number

and then scroll to the desired test by pressing . A test can be terminated by pressing ; pressing after a test

has started terminates the current test and advances the system to the next test. Once in the next step, you may start

the test by pressing , advance past it by pressing , or back up by pressing . When testing is complete, exit the

Quick Test by pressing and then ; this MUST be done to restore the unit software to automatic control.

If the keyboard is not used for 10 minutes, the display

returns to the rotating default display. Press and

to exit Quick Test and then press to restart the test

procedure.

Example 5 — Using Quick Test

KEYBOARD

ENTRY

DISPLAY

RESPONSE

ELEC HT EHS1 Stage 1 test

STG1 TST Pressing ENTR starts the fan test.

EHS2 Pressing the down arrow key

EXIT TST If no other test is desired, exit Quick

TST CMPL

Factory test of electric heat subfunction of test function

Fan automatically starts. There is an 11-second delay while the inlet guide vanes open and the heat stage is enabled. When the electric heat stage should be running, the display shows EHS ON. Test remains on until another key is pressed

advances the system to stage 2 test. Any stage may be selected. Press

the key until the desired stage is displayed, then press ENTR to start

the test Test. Fan shuts off, last electric heat

stage shuts off, and IGVs close Test is completed. Unit resumes

automatic control

COMMENTS

Programming Functions

SERVICE FUNCTION — The service function allows the operator to verify or change factory and ﬁeld conﬁgurations. The service subfunctions are listed below. (See T able13 for details.) Refer to T able16 for conﬁguration value ranges and defaults.

— Use this subfunction to log on before perform-

ing any subfunction in Factory Conﬁgurations ( ), and to log off after completing service subfunctions. See

Example 6.

Example 6 — Logging On and Logging Off

Service Function

KEYBOARD

ENTRY

TO LOG ON:

TO LOG OFF:

DISPLAY

RESPONSE

LOG ON LOGGEDON

LOG OFF Ready for operator to log off LOGD OFF

COMMENTS

Ready for password to be entered

Operator can now use service functions

Logged off — password protection enabled

Table 16 — Service Conﬁguration Ranges and Defaults

SERVICE

SUBFUNCTION

NUMBER

4 English/Metric System (0 = English, 1 = Metric) 0/1 0

12 NTFC Lock Out Temperature (F) 40 to 70 50

LEGEND

CV — Constant Volume DX — Direct Expansion NTFC — Nighttime Free Cooling VAV — VariableAir Volume

*Value varies and is automatically calculated by the control. Override this feature by forcing the value.

Unit Type (0 = CV, 1 = VAV) 0/1 0 Cooling Type (0 = none, 1 = chilled water coil,2=DX) 0to2 1 DX Cooling Stages 0 to 8 2 Heating Type (0 = none, 1 = hot water/steam coil, 2 = electric heater) Electric Heater Stages 0 to 8 0 Mixed Air Dampers (0 = none, 1 = analog, 2 = 2-position) Indoor-Air Quality Type (1 = single gas, 2 = differen ial/2 gases) 1/2 1 Mixed-Air Temperature Protection Yes/No Yes Bus Number 0 to 239 0 Element Address 0 to 239 1 Password 0 to 9999 1111

Nighttime Free Cooling Enabled/Disabled Disabled Humidity Control (0 = none, 1 = analog, 2 = discrete) 0 to 2 0 Occupied Heating Enabled/Disabled Disabled Space Temperature Reset Enabled/Disabled Disabled Demand Limit Enabled/Disabled Disabled Fan Tracking Enabled/Disabled Disabled Constant Outside Air Enabled/Disabled Disabled Night Purge Enabled/Disabled Disabled Indoor Air Quality Enabled/Disabled Disabled Indoor Air Quality Priority Level (high = 1, low = 2, none = 3) 1 to 3 2 Adaptive Optimal Start/Stop Enabled/Disabled Disabled Timed Override Schedules 1 to 3 1 (1 = Time schedule no. 1, 2 = Time schedule no. 2, 3 = Both) Timed Override Hours 0 to 4 0

Heating Coil Master Proportional Gain 0 to 20.0 8 0 Heating Coil Master Integral Gain 0 to 2.0 0 3 Heating Coil Master Derivative Gain 0 to 20.0 0 0 Heating Coil Submaster Gain −20 0 to 20.0 −7.5 Heating Coil Submaster Center Value (%) 0 to 100 50 Heating Coil Fan ‘‘Off’’ Value (F) 35 to 65 40

Cooling Master Proportional Gain 0 to 20.0 8 0 Cooling Master Integral Gain 0 to 2.0 0 3 Cooling Master Derivative Gain 0 to 20.0 0 0 Cooling Coil Submaster Gain −20 0 to 20.0 −7.5 Cooling Coil Submaster Center Value (%) 0 to 100 80 Cooling High Humidity Limit (%) 0 to 99 99

DX Cooling Submaster Gain 2.0 to 25.0 * DX Cooling Minimum Submaster Reference 0 to 60 40 DX Cooling Stage 1 Time Guard Device (0 = disabled, 1 = enabled) DX Cooling Stage 2 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 3 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 4 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 5 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 6 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 7 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 8 Time Guard (0 = disabled, 1 = enabled) Enabled/Disabled Enabled DX Cooling Stage 1 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 2 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 3 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 4 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 5 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 6 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 7 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal DX Cooling Stage 8 Logic Type (0 = normal, 1 = inverted) Normal/Inverted Normal

Inlet Guide Vanes Master Proportional Gain 0 to 5.0 0 5 Inlet Guide Vanes Master Integral Gain 0 to 2.0 0 3 Inlet Guide Vanes Master Derivative Gain 0 to 5.0 0 0 Inlet Guide Vanes Submaster Gain −10.0 to 10.0 5 0 Inlet Guide Vanes Submaster Center Value (%) 0 to 100 50

Mixed-Air Damper Master Proportional Gain 0 to 20.0 8 0 Mixed-Air Damper Master Integral Gain 0 to 2.0 0 3 Mixed-Air Damper Master Derivative Gain 0 to 20.0 0 0 Mixed-Air Damper Submaster Gain −20 0 to 20.0 −7.5 Mixed-Air Damper Submaster Center Value (%) 0 to 100 50 Mixed-Air Damper Minimum Position (%) 0 to 100 10

Electric Heat Master Propor ional Gain 0 to 20.0 8 0 Electric Heat Master Integral Gain 0 to 2.0 0 3 Electric Heat Master Derivative Gain 0 to 20.0 0 0 Electric Heat Submaster Gain 0 to 15.0 5 0

CONFIGURATION VALUE RANGE

FACTORY DEFAULT

VALUE

0to2 1

Enabled/Disabled Enabled

Table 16 — Service Conﬁguration Ranges and Defaults (cont)

SERVICE SUBFUNCTION

NUMBER

AOTC — Analog Output Temperature Control OAVP — Outside Air Velocity Pressure

LEGEND

Night Purge Duration (minutes) 5 to 240 15 Night Purge Low Temperature Damper Position (% output) 0 to 100 10 Night Purge High Temperature Damper Position (% output) 0 to 100 35

Constant Outside Air Master Proportional Gain 0.0 to 5.0 0.3 Constant Outside Air Master Integral Gain 0.0 to 5.0 1.0 Constant Outside Air Master Derivative Gain 0.0 to 5.0 0.0 Constant Outside Air Submaster Gain 60 to 600 * OAVP Sensor Low Voltage Point 0 to 2 2 OAVP Sensor High Voltage Point 5 to 10 10 OAVP Sensor Low Voltage Reference 0.0 to 2.0 0.0 OAVP Sensor High Voltage Reference 0.01 to 5.00 0.05 OAVP Sensor Probe Mul iplier Factor 0.100 to 9.999 1.564

Air Quality Sensor 1 Master Proportional Gain 0.01 to 1.00 0.10 Air Quality Sensor 1 Master Integral Gain 0.01 to 1.00 0.03 Air Quality Sensor 1 Maximum Damper Position (%) 0 to 100 50 Air Quality Sensor 1 Low Voltage Point 0 to 2 2 Air Quality Sensor 1 High Voltage Point 5 to 10 10 Air Quality Sensor 1 Low Voltage Reference 0 to 2000 0 Air Quality Sensor 1 High Voltage Reference 0 to 2000 2000

Air Quality Sensor 2 Master Proportional Gain 0.01 to 1.00 0.10 Air Quality Sensor 2 Master Integral Gain 0.01 to 1.00 0.03 Air Quality Sensor 2 Maximum Damper Position (%) 0 to 100 50 Air Quality Sensor 2 Low Voltage Point 0 to 2 2 Air Quality Sensor 2 High Voltage Point 5 to 10 10 Air Quality Sensor 2 Low Voltage Reference 0 to 2000 0 Air Quality Sensor 2 High Voltage Reference 0 to 2000 2000

Building Factor (%) 1 to 100 10 24 hour Unoccupied Factor 0 to 99 15 Set Point Bias (F) 0 to 10 2 Maximum Allowable Stop Time 0 to 120 60

Reset Ratio 0 to 10 3 Reset Limit 0 to 20 10

Supply Velocity Upper Limit (in. wg) 0 to 3.0 2.0 Return Velocity Upper Limit (in. wg) 0 to 3.0 2.0 Supply Duct Area 0 to 50 0 Return Duct Area 0 to 50 0 Fan Tracking Master Proportional Gain 0.0 to 2.0 0.5 Fan Tracking Master Integral Gain 0.0 to 2.0 0.5 Fan Tracking Master Derivative Gain 0.0 to 5.0 0.0 Fan Tracking Submaster Gain −20.0 to 20.0 10.0 Fan Tracking Submaster Center Value (%) 0 to 100 50

Humidity Master Proportional Gain 0.0 to 10.0 2.0 Humidity Master Integral Gain 0.0 to 2.0 0.3 Humidity Master Derivative Gain 0.0 to 10.0 0.0 Humidity Submaster Gain −20.0 to 20.0 7.5 Humidity Submaster Center Value (%) 0 to 100 50

Space Temperature Low Alarm Limit — Occupied (F) −10 to 245 65 Space Temperature High Alarm Limit — Occupied (F) −10 to 245 80 Space Temperature Low Alarm Limit — Unoccupied (F) −10 to 245 45 Space Temperature High Alarm Limit — Unoccupied (F) −10 to 245 100 Supply Air Temperature Low Alarm Limit — Occupied (F) −10 to 245 45 Supply Air Temperature High Alarm Limit — Occupied (F) −10 to 245 120 Supply Air Temperature Low Alarm Limit — Unoccupied (F) −10 to 245 35 Supply Air Temperature High Alarm Limit — Unoccupied (F) −10 to 245 180 Return Air Temperature Low Alarm Limit — Occupied (F) −10 to 245 60 Return Air Temperature High Alarm Limit — Occupied (F) −10 to 245 90 Return Air Temperature Low Alarm Limit — Unoccupied (F) −10 to 245 35 Return Air Temperature High Alarm Limit — Unoccupied (F) −10 to 245 120 Temperature Input Low Alarm Limit — Occupied (F) −10 to 245 −10 Temperature Input High Alarm Limit — Occupied (F) −10 to 245 245 Temperature Input Low Alarm Limit — Unoccupied (F) −10 to 245 −10 Temperature Input High Alarm Limit — Unoccupied (F) −10 to 245 245 Outside Air Temperature Low Alarm Limit (F) −40 to 245 −40 Outside Air Temperature High Alarm Limit (F) −40 to 245 120 Mixed Air Temperature Low Alarm Limit (F) 0 to 250 0 Mixed Air Temperature High Alarm Limit (F) 0 to 250 250 Relative Humidity Low Alarm Limit (%) 0 to 100 0 Relative Humidity High Alarm Limit (%) 0 to 100 100 Outside Air Relative Humidity Low Alarm Limit (%) 0 to 100 0 Outside Air Relative Humidity High Alarm Limit (%) 0 to 100 100 Static Pressure Low Alarm Limit (in. wg) 0 to 5.0 1.0 Static Pressure High Alarm Limit (in. wg) 0 to 5.0 2.5 Supply Velocity Low Alarm Limit (in. wg) 0 to 3.0 0.0 Supply Velocity High Alarm Limit (in. wg) 0 to 3.0 3.0 Return Velocity Low Alarm Limit (in. wg) 0 to 3.0 0.0 Return Velocity High Alarm Limit (in. wg) 0 to 3.0 3.0 Delta CFM x 100 (CCFM) Low Alarm Limit 0 to 250 0 Delta CFM x 100 (CCFM) High Alarm Limit 0 to 250 250 Air Quality Sensor 1 High Alarm Limit (ppm) 0 to 2000 800 Air Quality Sensor 2 High Alarm Limit (ppm) 0 to 2000 800

Preheat Coil/AOTC Master Proportional Gain 0.0 to 20.0 5.0 Preheat Coil/AOTC Master Integral Gain 0.0 to 2.0 0.3 Preheat Coil/AOTC Master Derivative Gain 0.0 to 20.0 0.0 Preheat Coil/AOTC Submaster Gain −20.0 to 20.0 −5.0 Preheat Coil/AOTC Submaster Center Value (%) 0 to 100 F 50 Preheat Coil/AOTC Fan/Off Value (F) 35 to 65 40 Preheat Coil/AOTC Sensor 0 to 128 0

Discrete Temperature Control Sensor 0 to 128 0 Discrete Temperature Control Logic 0 to 1 0 Discrete Temperature Control Hysteresis (F) 0 to 20 2

Service/Maintenance Limits (hours x 1000) 0 to 99 0 Service/Maintenance Elapsed Hours (hours x 1000) 0 to 99 0

CONFIGURATION VALUE RANGE

FACTORY DEFAULT

VALUE

— Used to verify software version.

-----------------------------------------------— Used to verify and change factory conﬁgura-

tion. Requires password entry in . See Example 7. NOTE: When more than one unit is connected to the

Carrier Comfort Network, the element address must be changed on all but one unit. The element address system default is 1, and element address numbers cannot be repeated. Element address must be changed at the local interface device.

------------------------------------------------

Example 7 — Reading and Changing

Factory Conﬁgurations

KEYBOARD

ENTRY

DISPLAY

RESPONSE

FACT CFG TYPE CV Unit type is constant volume UNIT TYPE IS CV TYPE VAV Unit type is changed to VAV COOL COI Cooling type is coil DXST 2 DX cooling stage quantity is 2 HEAT HCL HEAT NON Changed to no heat unit HEAT ELE Changed to electric heat HEAT COI EHST 0 Electric heater stages = 0 EHST N MIXD ALG Unit with mixed air dampers MIXD NON Changed to without dampers IAQT 1 MATP YES BUS 0 Bus number = 0 ADR 1 Element address = 1 ADR 2 Element address changed to 2

Factory conﬁguration subfunction of service function

Explanation is scrolled across screen

Heating type is hot water/ steam coil

Heating type is changed back to hot water/steam coil

Electric heater stages = N, where N = number of stages

Indoor air quality type is single gas sensor

Mixed air temperature protection enabled

COMMENTS

Example 8 — Conﬁguration of Measurements

KEYBOARD

ENTRY

DISPLAY

RESPONSE

UNIT 0 UNIT 1 UNIT 0

COMMENTS

Measurements are displayed using English (0 = English, 1 = Metric)

Measurements are now displayed using the Metric system

Measurements are returned to English

Example 9 — User Conﬁgurations

KEYBOARD

ENTRY

DISPLAY

RESPONSE

USER CFG User conﬁgurations NTEN DSB NTFC is disabled NTEN EN NTFC is enabled

NTEN DSB NTFC is disabled

HUEN 0 Humidiﬁer control is none HUEN 1 HUEN 0

OHEN DSB RSEN DSB Space temperature reset (disabled) DLEN DSB FTEN DSB Fan tracking (disabled) OAEN DSB Constant outside air (disabled) NPEN DSB Night purge (disabled) AQEN DSB Indoor air quality (disabled) IAQP DSB OSEN DSB Optimal start is disabled OSEN EN Optimal start is enabled

OSEN DSB Optimal start is disabled

TSCH 1 Time schedule No. 1 is enabled TSCH 2 Time schedule No. 2 is enabled TSCH 1 TOVR 0 Time override value=0hrs

Unit changed to analog humidiﬁer control

Humidiﬁer control is changed back to none

Scroll past occupied heating (disabled)

Scroll past demand limiting (disabled)

Indoor air quality priority level (disabled)

Time schedule is changed back to No. 2

COMMENTS

PSW XXXX Password

— Used to change the HSIO display of the measure-

ments from English to Metric. See Example 8.

------------------------------------------------

— Used to read or change factory conﬁguration of

user options. See Example 9.

------------------------------------------------

TOVR 1 Time override value=1hr TOVR 0 Time override value=0hrs

NTFC — Nighttime Free Cooling

— Used to read or change factory conﬁguration

of heating coil. See Example 10.

Example 10 — Conﬁguration of Heating Coil

KEYBOARD

ENTRY

NOTE: The subfunctions to conﬁgure the cooling coil , inlet guide vanes , mixed air damper , and electric

heaters , are performed in the same manner as Example 10.

------------------------------------------------

DISPLAY

RESPONSE

HEATCOIL MPG 8.0 Master proportional gain

MPG N Master proportional gain value is

MIG 0.3 Scroll past master integral gain MDG 0.0 Master derivative gain

MDG 0.0 Master derivative gain value

SMG −7.5 Submaster gain SCV 50% Submaster center value FOV 40 Fan off value SMR N SMR X SMR N

Heat coil ﬁeld conﬁguration subfunction of service function

changed to N, where N = new value within the allowable range

remains 0.0 (old value is still displayed). N value is not within the allowable range

Display of submaster reference value

The submaster reference value has been forced

The submaster reference value force has been removed

COMMENTS

— Used to read or change factory conﬁguration of

cooling (chilled water coil or direct expansion).

-----------------------------------------------— Used to read or change conﬁguration of direct

expansion cooling options.

-----------------------------------------------— Used to read or change factory conﬁguration of

inlet guide vanes.

------------------------------------------------

— Used to read or change conﬁguration of

mixed air dampers.

------------------------------------------------

— Used to read or change conﬁguration of elec-

tric heater.

------------------------------------------------

— Used to read or change factory conﬁgura-

tion of Nighttime Free Cooling (NTFC) option.

------------------------------------------------

— Used to read or change conﬁguration of

night purge option.

-----------------------------------------------— Used to read or change conﬁguration of

constant outside air option and outside air velocity pressure sensor.

-----------------------------------------------— Used to read or change conﬁguration of in-

door-air quality option and AQ1 sensor.

-----------------------------------------------— Used to read or change conﬁguration of in-

door-air quality option and AQ2 sensor.

-----------------------------------------------— Used to read or change factory conﬁgura-

tion of Adaptive Optimal Start/Stop.

-----------------------------------------------— Used to read or change factory conﬁgura-

tion of space temperature reset. See Example 11.

-----------------------------------------------— Used to read or change loadshed group

and number. See Example 12.

------------------------------------------------

Example 11 — Conﬁguration of Space

Temperature Reset

KEYBOARD

ENTRY

DISPLAY

RESPONSE

SPCRESET Space temperature reset ﬁeld

conﬁguration subfunction of

service function RTIO 3 Reset ratio set at 3 RTIO N Ratio changed to N, where

N = new value within the

allowable range LIMT 10 Reset limit set at 10 LIMT N Reset limit changed to N,

where N = new value between

0 and 20

COMMENTS

Example 12 — Conﬁguration of Loadshed

KEYBOARD

ENTRY

DISPLAY

RESPONSE

LOADSHED Loadshed ﬁeld conﬁguration

subfunction of service function LSGP 1 Loadshed group 1

LSGP 2 Loadshed group changed to 2

COMMENTS

— Used to read or change ﬁeld conﬁguration

of fan tracking. See Example 13.

-----------------------------------------------— Used to read or change factory conﬁgura-

tion of humidity control.

-----------------------------------------------— Used to read or change factory conﬁgura-

tion of alarm limits. See Example 14.

-----------------------------------------------— Used to read or change ﬁeld conﬁguration

of analog temperature control. See Example 15.

------------------------------------------------

— Used to read or change ﬁeld conﬁguration

of discrete temperature control. See Example 16.

------------------------------------------------

Example 13 — Conﬁguration of Fan Tracking

KEYBOARD

ENTRY

DISPLAY

RESPONSE

FANTRACK Fan tracking ﬁeld conﬁguration

SVUL 1.5 SVUL 2.0 RVUL 1.5 SDAR 0 Supply duct area = 0

SDAR 8 Supply duct area changed to

RDAR 6 MPG 0.5 MIG 0.5 MDG 0.0 Master derivative gain MDG 4 SMG 10 Scroll past submaster gain SCV 50

SMR N Submaster reference value

SMR X SMR N

subfunction of service function Supply velocity upper limit

= 1.5 in. wg Supply velocity upper limit

changed to 2.0 in. wg Scroll past return velocity upper

limit (1.5 in. wg)

8 sq ft. (Enter whole numbers; decimals not accepted)

Scroll past return duct area (6 sq ft)

Scroll past master proportional gain

Scroll past master integral gain

Master derivative gain changed to 4

Scroll past submaster gain center value

(calculated and updated by the software)

Submaster reference value forced to X value

Submaster reference value force is removed

COMMENTS

Example 14 — Conﬁguration of Alarm Limits

KEYBOARD

ENTRY

DISPLAY

RESPONSE

ALRMLIMT SPLO 65 SPHO 80 SPLU 45 SPHU 100 SALO 45

SALO N Supply-air temperature low limit

Alarm limit ﬁeld conﬁguration of subfunction of service function

Scroll past space temperature low limit (occupied mode)

Scroll past space temperature high limit (occupied mode)

Scroll past space air temperature low limit (unoccupied mode)

Scroll past space air temperature high limit (unoccupied mode)

Supply-air temperature low limit set at 45 F (occupied mode)

changed to N, whereN=new value within allowable range (−10 F to 245 F)

COMMENTS

Example 15 — Conﬁguration of Analog

Temperature Control

KEYBOARD

ENTRY

DISPLAY

RESPONSE

AO CTRL Analog temperature control

MPG 5.0 MIG 0.3 Scroll past master integral gain MDG 0.0 Scroll past master derivative gain SMG −5.0 Scroll past submaster gain SCV 50 FOV 40 Scroll past fan OFF value SEN 0

SEN 1 Controlling temperature sensor

SMR X Submaster reference value SMR N

SMR X Force removed from submaster

conﬁguration subfunction of service function

Scroll past master proportional gain

Scroll past submaster center value

Controlling temperature sensor (none conﬁgured)

conﬁgured to sensor 1. Sensor codes as follows:

1 - Supply-air temperature sensor

2 - Outdoor-air temperature

3 - Mixed-air temperature sensor

6 - Space temperature sensor

7 - Return-air temperature sensor

34 - Other optional sensor

Submaster reference value forced to N value

reference value. Display shows last value prior to force

COMMENTS

(standard)

sensor (standard)

(optional)

(standard)

Example 16 — Conﬁguration of Discrete

Temperature Control

Example 18 — Service/Maintenance

Alarm Conﬁguration

KEYBOARD

ENTRY

DISPLAY

RESPONSE

DO CTRL Discrete temperature control

SEN 1 Controlling temperature sensor

SEN 34 Controlling temperature sensor is

TYP 0

conﬁguration subfunction of service function

conﬁgured to sensor 1. Sensor codes as follows:

1 - Supply-air temperature sensor 2 - Outdoor-air temperature 3 - Mixed-air temperature sensor 6 - Space temperature sensor 7 - Return-air temperature 34 - Other optional sensors

34, where sensor 34 is one of 2 optional sensor types (space temperature sensor or duct temperature sensor)

Discrete output control logic (0 = normal logic, 1 = reverse logic)

COMMENTS

(standard) sensor (standard) (optional) (standard) (standard)

— Used to read service history. See Example 17.

-----------------------------------------------— Used to read or change ﬁeld conﬁguration

of service maintenance alarm duration and to read elapsed time. See Example 18.

-----------------------------------------------— Used to read timed override history. See

Example 19. NOTE: The key is used to enable or turn on certain

functions; the CLR key is used to disable these functions. The key may also be used to disable the functions.

SET POINT FUNCTION — Set points are entered through the keyboard. Set points can be changed within the upper and lower limits, which are ﬁxed. See Table 17.

Example 17 — Service History Conﬁguration

KEYBOARD

ENTRY

DISPLAY

RESPONSE

SERVHIST SDAY 2 ST 20 FH 240

4.06.30

4.19.00

COMMENTS

Service history conﬁguration subfunction of service function

The unit had 2 starts within the last 24 hours

The unit had a total of 20 starts since the unit was manufactured

The fan has run for 240 hours since unit manufacture.

The unit was last started on Thursday at 6:30 am

The unit was last stopped on Thursday at 7:00 pm

KEYBOARD

ENTRY

DISPLAY

RESPONSE

SRV/MTN Service/Maintenance alarm

SMAL 2 SMAL 5 Service/Maintenance alarm

SMEH 3 Service/Maintenance elapsed

conﬁguration subfunction of service function

Service/Maintenance alarm limit is 2000 hrs (hours x 1000)

limit is changed to 5000 hrs (This represents the cumulative number of hours the fan must be energized before a service/maintenance alarm is generated) (NOTE: Entering a . disables the alarm function)

hours is 3000 (This is the amount of time elapsed from the start of the service/maintenance alarm interval)

COMMENTS

Example 19 — Timed Override History

KEYBOARD

ENTRY

DISPLAY

RESPONSE

OVRDHIST OHR 3 Within the current 24 hour period

Timed override history subfunction of service function

(beginning at midnight), the unit operated for 3 hours in the timed override mode (mode 39)

COMMENTS

— Displays system set points. See Table 13 for

sequence of set points.

-----------------------------------------------— Displays demand limit set points.

-----------------------------------------------— Displays time of day and day of week.

-----------------------------------------------— Displays Daylight Savings Time.

-----------------------------------------------— Displays holidays (month, day, and duration).

Table 17 — Set Point Ranges and Defaults

SET POINT

Occupied Heating Set Point (F) 40 to 90 68 Occupied Cooling Set Point (F) 45 to 99 78 Unoccupied Heating Set Point (F) 40 to 90 55 Unoccupied Cooling Set Point (F) 70 to 99 90 Static Pressure

Set Point (in. wg)

Supply-Air Temperature

Set Point (F)

Delta CFM Set Point 0 to 250 0 Humidity Set Point (%) 0 to 100 40 Analog Temperature

Control Set Point (F)

Discrete Temperature

Control Set Point (F)

Air Quality Sensor 1

Set Point (ppm)

Air Quality Sensor 2

Set Point (ppm)

Outside Air Velocity Pressure

Set Point (in. wg)

ALLOWABLE

RANGE

0 to 5.0 1.5

35 to 65 55

40 to 100 40

−40 to 245 0 0 to 2000 650 0 to 2000 650

0.0 to 5.0 0.08

DEFAULT

Reading and Changing Set Points — Example 20 shows how to read and change system set points. Other set points can be changed by following the same procedure. Refer to Table 13 for the display sequence of set points in each subfunction.To adjust any parameter after enabling the func-

tion, press until desired parameter is displayed. Key in new value and press . If input is within the allowable range, the display shows the parameter and new value. If

the input is not within the allowable range, the old value remains displayed.

Example 20 — Reading and Changing

System Set Points

KEYBOARD

ENTRY

DISPLAY

RESPONSE

SETPOINT System set points OHSP 68.0 OHSP 70.0 Key in 70 and press ENTR, display

OCSP 78.0 Present occupied cooling set point OCSP 78.0 Key in 30 and press ENTR, display

OCSP 75.0 Key in 75 and press ENTR, display

Present occupied heating set point is 68.0

shows new occupied heating set point is 70, which is within the allowable range

is 78.0 still shows occupied cooling set point

as 78.0 because 30 is not within the allowable range. See Table 15

shows new occupied cooling set point is 75.0, which is within the allowable range

COMMENTS

Reading and Changing Time and Date Display — Time is entered and displayed in 24-hour (military) time. The day of the week is entered as a number: 1 = MON, 2 = TUE...7 = SUN. The month is also entered as a number:1=JAN,2=

FEB...12 = DEC. The key is used as the colon when entering the time and date. See Example 21.

Reading and Changing Daylight Savings Time — Example 22 shows how to read and change daylight savings time. The month is entered as a number: 1 = January, 2 = February...12 = December. The day of week and time of day are entered as explained in Reading and Changing Time and Date Display above.

Example 21 — Setting of Time and Date

KEYBOARD

ENTRY

DISPLAY

RESPONSE

TIME Time display

MON 16:00 Current setting

TUE 13:05 New setting of

JAN 01 96 Current setting

FEB 27 96 New setting of

COMMENTS

subfunction of set point function

is Monday, 4:00 pm

Tuesday, 1:05 pm is entered and displayed

is January 1, 1996

February 27, 1996 is entered and displayed

Example 22 — Setting Daylight Savings Time

KEYBOARD

ENTRY

DISPLAY

RESPONSE

DAYLIGHT Daylight savings time ﬁeld

ENM X Month when daylight savings ENM 4 Daylight savings time

END X Day of month when daylight END 16 Daylight savings time

ENT X Time of day when daylight ENT 2.00 Daylight savings time

LVM X Month when daylight savings LVM 11 Daylight savings time

LVD X Day of month when daylight LVD 12 Daylight savings time

LVT X Time of day when daylight LVT 2.00 Daylight savings time

COMMENTS

conﬁguration of set point function

time begins conﬁgured to start Month 4

(April) savings time begins conﬁgured to start on the

16th of the month savings time begins conﬁgured to start at 2:00 am

on the 16th of April time ends conﬁgured to end Month 11

(November) savings time ends conﬁgured to end on the 12th

of November savings time ends conﬁgured to end at 2:00 am

on November 12

Reading and Changing Holidays — Example 23 explains how to set holidays. Up to 18 holiday periods can be set for one calendar year. When the calendar year changes the holidays must be reconﬁgured for the new year.

Example 23 — Setting of Holidays

KEYBOARD

ENTRY

DISPLAY

RESPONSE

COMMENTS

HOLIDAY Holiday ﬁeld conﬁg-

uration subfunction of set point function

NEW

First holiday conﬁguration

JUL 04 01 The ﬁrst holiday is

conﬁgured to start Month 7 (July), day 4 (July 4) and last for one day

NOV 23 02 The second holiday

is conﬁgured to start Month 11 (November), day 23 and last for 2 days.

SCHEDULE FUNCTION — Two schedules are provided with the PIC system. Schedule I automatically switches the unit from an occupied mode to an unoccupied mode. Schedule II automatically changes the optional discrete output from occupied to unoccupied mode.

Each schedule consists of from one to 8 occupied time periods, set by the operator.These time periods can be flagged to be in effect or not in effect on each day of the week. The day begins at 00.00 and ends at 24.00. The unit is in unoccupied mode unless a scheduled time period is in effect. If an occupied period is to extend past midnight, it must be programmed in the following manner: Occupied period must end at 24:00 hours (midnight); a new occupied period must be programmed to begin at 00:00 hours on the next day.

The time schedule can be overridden to keep the unit or optional discrete output in the occupied mode for 1, 2, 3, or 4 hours on a one-time basis.

The air handler can be conﬁgured for an applicable holiday/ shutdown schedule. This function can only be used if the PIC is connected to the Carrier Comfort Network. The network will send a holiday message (ﬂag) to the unit on the appropriate holiday. The unit then uses the schedule that has been set for the holiday period. The unit automatically returns to its normal schedule after the holiday period is complete.

Figure 75 shows a Schedule I example for an officebuilding with the unit operating on a set point schedule. The schedule is based on building occupancy with 3-hour offpeak cool down period from midnight to 3 am following weekend shutdown. To learn how this sample schedule can be programmed, see Example 24. The same scheduling procedures can be used to set optional discrete output

Schedule II. Subfunctions through deﬁne schedule of air handler (Schedule I). Subfunctions

through deﬁne schedule of optional

discrete output (Schedule II).

Fig. 75 — Schedule I Sample Time Schedule

Example 24 — Using the Schedule Function

Example 24 — Using the Schedule Function (cont)

KEYBOARD

ENTRY

PROGRAMMING PERIOD 1:

DISPLAY

RESPONSE

PERIOD 1 Deﬁne schedule period 1 OCC 00.00 Start of occupied time.

UNO 00.00 Start of unoccupied time

UNO 3.00 MON NO Monday is not ﬂagged

MON YES Monday is now ﬂagged

TUE YES For this example, period 1

TUE NO Tuesday is now ﬂagged

COMMENT

For this example, ﬁrst period should start here (at midnight) so no entry is needed

(end of period). For this example, period 1 should end at 3:00 am

Period 1 ends at 3:00 am

for period 1. To put period 1 into effect on Monday, Monday must be ﬂagged yes

for period 1 to be in effect

is to be in effect on Monday only. All other days must be checked to be sure that they are ﬂagged no. If any day is ﬂagged yes, change to no

no for period 1

KEYBOARD

ENTRY

PROGRAMMING PERIOD 2:

For this example, period 2 is used on Monday and Tuesday.

DISPLAY

RESPONSE

PERIOD 2 OCC 00.00 Start of occupied time

OCC 7.00 Occupied time will UNO 00.00 Start of unoccupied

UNO 18.00 MON NO Monday is not ﬂagged

MON YES Monday is now ﬂagged

TUE NO Tuesday is not ﬂagged

TUE YES Tuesday is now ﬂagged

WED YES For this example,

WED NO Wednesday is now

COMMENT

Deﬁne scheduling period 2

start at 7:00 am time (end of period)

for this example, period 2 should end at 18:00 (6:00 pm)

Period 2 ends at 18:00 (6:00 pm)

for period 2. To put period 2 into effect on Monday, Monday must be ﬂagged yes

for period 2 to be in effect

for period 2. To put period 2 into effect on Tuesday, Tuesday must be ﬂagged yes

for period 2 to be in effect

period 2 is to be in effect only on Monday and Tuesday. All other days must be checked to be sure that they are ﬂagged no. If a day is ﬂagged yes, change to no

ﬂagged no for period 2

Example 24 — Using the Schedule Function (cont)

KEYBOARD

ENTRY

PROGRAMMING PERIOD 3:

For this example, Period 3 is used on Wednesday only.

Period 4 and 5 can be programmed in the same manner, ﬂagging Thursday and Friday yes for period 4 and Saturday yes for period 5. For this example, periods 7 and 8 are not used; they should be programmed OCC 00.00, UNO 00.00.

NOTE: When a day is ﬂagged yes for 2 overlapping periods, occupied time will take precedence over unoccupied time. Occupied times can overlap in the schedule with no consequence.

To extend an occupied mode beyond its normal termination for a one-time schedule override, program as shown below:

DISPLAY

RESPONSE

OCC 00.00 Start of occupied time OCC 7.00

UNO 00.00 Start of unoccupied

UNO 21.30 MON NO Check to be sure that

TUE NO WED NO Wednesday is ﬂagged

WED YES Wednesday is now

THU NO Check to be sure that

FRI NO SAT NO SUN NO HOL NO

COMMENT

Occupied time will start at 7:00 am

time (end of period 3). For this example, period 3 should end at 21:30 (9:30 pm)

Period 3 ends at 21:30 (9:30 pm)

Monday and Tuesday are ﬂagged no for period 3

no. Change to yes ﬂagged yes for

period 3 all other days are

ﬂagged no

KEYBOARD

ENTRY PROGRAMMING PERIOD 6: For this example, Period 6 is used for holiday only.

DISPLAY

RESPONSE

OCC 00.00 Start of occupied time OCC 20.00

UNO 00.00 Start of unoccupied

UNO 21.00 MON NO Check to be sure that

TUE NO WED NO THU NO FRI NO SAT NO SUN NO HOL NO HOL YES

COMMENT

Occupied time will start at 20:00 (8:00 pm)

time (end of period 6). For this example, period 6 should end at 21:00 (9:00 pm)

Period 6 ends at 21:00 (9:00 pm)

Monday through Sunday are ﬂagged no for period 6

Holiday is ﬂagged no. Change to yes

Holiday is now ﬂagged yes for period 6

OVRD 0

OVRD 3

Override is set for 0; enter the number of hours of override desired

Unit will now remain in occupied mode for an additional 3 hours

CONTROL OPERATING SEQUENCE

Constant Volumeand VariableAirVolumeUnits

TWO-POSITION DAMPER CONTROL — Two-position damper control opens or closes ﬁeld-supplied and installed two-position outdoor-air dampers in order to provide minimum outdoor air ventilation.

If the supply fan is OFF, the damper is closed. If the supply fan is ON, the control determines if the unit is in the OCCUPIED mode. If unit is in the OCCUPIED mode, the dampers open. If unit is in the UNOCCUPIED mode, the dampers close.

FILTERST ATUS CONTROL — This control sequence monitors one or more airﬂow switches which measure the differential pressure between the upstream and downstream side of a ﬁlter.

When the ﬁlter becomes dirty or needs to be replaced, the airﬂow switches send a discrete signal to the processor module. This, in turn, generates an alarm at the Local Interface Device or Building Supervisor.

F ANCONTROL — The supply fan is started or stopped based on the occupancy schedule, adaptive optimal start, nighttime free cooling, unoccupied heating, unoccupied cooling, demand limiting, night purge, or timed override.

The start of an occupied period is determined by either the occupancy schedule or optimal start. If optimal start is not selected, the supply fan starts at the occupied time entered in the occupancy schedule. If optimal start is selected, the fan starts at the calculated start time. The fan stops at the unoccupied time entered in the occupancy schedule. (Timed override may be used to extend the occupied period between 1 and 4 hours.)

During the unoccupied period, whenever the space temperature falls below the unoccupied heating set point or rises above the unoccupied cooling set point, the supply fan energizes and runs until the space temperature returns to within the required limits.

The supply fan can also run between the hours of 3:00 am and 7:00 am when the unit is in the Nighttime Free Cooling mode to pre-cool the space prior to the Occupied period.

Constant volume units that are subject to demand limiting stop the supply fan whenever a loadshed command is received from the CCN Loadshed option. The supply fan remains OFF until the loadshed command is cleared or the internal maximum loadshed timer expires.

NIGHTTIME FREE COOL (NTFC) — Nighttime free cooling is used to start the supply fan to precool the building’s interior using outside air. This delays the need for mechanical cooling when the system enters the Occupied mode.

The system determines if the outside conditions (temperature and enthalpy) are suitable for outside cooling. If so, the supply fan is energized and the dampers modulate open. Once the space has been sufficiently cooled, the fan stops.

If the outside air conditions are not suitable, the fan remains OFF.

The unit must have mixed-air dampers to operate NTFC.

NTFC is scheduled to run only between the hours of

3:00 am and 7:00 am. NIGHT PURGE — During the unoccupied period, this fea-

ture starts the fans and opens the mixed-air dampers to remove stagnant air and airborne pollutants from the building space.

If the current time is within the conﬁgured night purge duration, the control reads the outdoor air temperature and determines the mixed-air damper position. If the outdoor air temperature is less than the conﬁgured NTFC lockout temperature, the system sets the mixed-air dampers at the conﬁgured low temperature position. If the outdoor-airtemperature is greater than the NTFC set point, or the enthalpy is high, the system sets the dampers at the conﬁgured high temperature position.

When the outside-air temperature is below the NTFC set point and the low temperature night purge damper position is set to zero, night purge is not performed. Also, when the outside air temperature is above the NTFC set point and enthalpy is high, if the high temperature night purge damper position is set to zero, night purge is not performed.

Night purge ends when the occupied time period begins. QUICK TEST — The Quick Test is initiated and controlled

at the local interface device (HSIO). It allows the service person or building owner to test all inputs and outputs of the PIC controls. When used, it displays all current values of input channels and allows the user to exercise all output channels.

Quick test suspends all process algorithms and forces all outputs with a service priority.

All service forces are removed when Quick Test is exited and control is returned to the process algorithms.

ANALOG OUTPUT TEMPERATURE CONTROL/ PREHEAT COIL CONTROL — The analog output temperature control adjusts an analog output to a ﬁxed set point, based on any analog temperature sensor connected to the unit. (Applicable sensors are: space temperature sensor, outsideair temperature sensor,mixed-air temperature sensor,supplyair temperature sensor, and return-air temperature sensor.)

If the fan is ON, the control identiﬁes the controlling temperature sensor, reads the sensor and compares the temperature to the conﬁgurable set point. It then calculates the temperature required to satisfy the conditions.

The calculated value is compared to the actual temperature and the corresponding output is modulated to the required position.

The preheat coil control adjusts the steam or hot water valve. The valve is modulated to raise the temperature of incoming outside air. The control uses a sensor downstream from the preheat coil to monitor the air temperature.

If the supply fan is OFF, the heating valve is modulated to maintain the desired minimum duct temperature (fan off value).

If the supply fan is on and the entering-air temperature is below the set point value, the heating valve is modulated to obtain the desired leaving-air temperature.

DISCRETE OUTPUT/ANALOG INPUTCONTROL— The discrete output is controlled as a function of a temperature sensor connected to the 39L or 39NX unit. (Applicable sensors are: space temperature sensor, outside-air temperature sensor, mixed-air temperature sensor, supply-air temperature sensor, and return-air temperature sensor.) The discrete output is turned ON/OFF as required to maintain the user conﬁgured set point.

The controlling sensor is identiﬁed and its value is read. The control determines which user-conﬁgurable control logic (normal or reverse) is required.

The control compares the sensor value to the conﬁgured set point.

If normal logic is used, the discrete output is turned ON when the sensor value is equal to or greater than the set point. This output is turned OFF when the sensor value is less than the set point decreased by a user conﬁgurable hysteresis.

If reverse logic is used, the discrete output is turned ON whenever the sensor value is less than the set point. This output is turned OFF when the sensor value is greater than the set point increased by a user conﬁgurable hysteresis.

DISCRETE OUTPUT, TIMECLOCK CONTROL — This control sequence turns ON an output channel when the current time of day is greater than or equal to the Occupied time and less than the next Unoccupied time. This discrete output is OFF at all other times. The output can be used for lighting control, pump control, or to control other devices which have to be ON during the Occupied period and OFF during the Unoccupied period. This control sequence operates under its own time schedule (Schedule II).

Using the local interface device or building supervisor,the output may be overridden to extend the occupied period between 1 and 4 hours.

The control determines the output that is under timeclock control. The current time of day is compared to the Occupied time and to the next Unoccupied time. If the current time of day is equal to or within the Occupied time period, the discrete output is turned ON. If the current time of day is equal to or within the Unoccupied time period, the discrete output is turned OFF.

HUMIDITY (ANALOG OUTPUT) CONTROL — The humidity analog output control adjusts the steam valve of the steam grid humidiﬁer. The valve is modulated to maintain the desired space or desired return-air humidity set point, depending on whether a wall-mounted or duct-mounted humidity sensor is used. A duct high humidity switch is also monitored and provides a user adjustable high limit safety.

If the supply fan is OFF, the steam valve is held closed. If the supply fan is ON, and the unit is in the Unoccupied

mode, the valve is held closed.

If the supply fan is ON and the unit is in the Occupied mode, the system determines the status of the duct high humidity switch. If the duct humidity is above the switch set point, the valve is held closed. If the duct humidity is less than the switch set point, the control reads the humidity sensor, compares the value to the set point and modulates the output as required to satisfy conditions.

HUMIDITY(DISCRETE OUTPUT) CONTROL — The humidity control sequentially adjusts a 2-stage humidiﬁer.The humidiﬁer is controlled to maintain a desired space or returnair humidity, depending on whether a wall-mounted or ductmounted humidity transmitter is used.

The ﬁrst stage of humidiﬁcation energizes the humidiﬁer spray pump (if applicable) along with the ﬁrst stage of the humidiﬁer.The second stage of humidiﬁcation energizes the second stage of the humidiﬁer.

A duct high humidity switch is also monitored and provides a user adjustable duct high humidity limit safety.

If the fan status is ON and the unit is in the Occupied mode, the control reads the space or return-air humidity sensor. If the humidity is 2% less than the humidity set point, the ﬁrst stage is turned ON.

If the humidity is 5% less than the humidity set point, both stages are turned ON.

As the humidity increases, the stages are turned OFF as follows: When the humidity is within 2% of the set point, the second stage of the humidiﬁer is turned OFF. When the humidity is greater than or equal to the set point, both stages are turned OFF. If the high humidity switch is tripped, all stages of the humidiﬁer are turned OFF.

INDOOR-AIR QUALITY (IAQ) — This function maintains the correct occupied ventilation rate using CO2as an indicator of occupancy level or controls the levels of volatile organic compounds (VOCs) or other indoor air pollutants by modulating the mixed air dampers. Varyingquantities of outdoor air are admitted during the Occupied period to maintain the ventilation rate at its set point or pollutants at or below the conﬁgured set points of the air-quality (AQ) sensors. See Fig. 76.

sensors are available from the factory as options for

ﬁeld installation. VOC or other types of sensors can be ﬁeldsupplied and installed. Sensors used with the IAQ feature can be conﬁgured several different ways:

• One sensor can be installed in either the space or return air stream to continuously monitor a single gas.

• Two sensors (monitoring the same gas) can be installed in different locations to provide separate inputs. For example, one sensor can be located in an occupied space and another in the return air duct, or each sensor can be installed in a different occupied space.

• Two sensors (typically VOC sensors monitoring the same gas) can be installed inside and outside the occupied space for comparative measurements. The control is conﬁgured to modify the damper position based on the value of the sensor in the occupied space, but before admitting outside air, the control performs a differential check to determine if the value of the sensor measuring the outside air is higher. If the outside sensor has a higher value, the damper does not change position.

Systems with One AQ Sensor — During the unoccupied period, the minimum damper position maintained by the IAQ control is 0. During the occupied period, the control

reads the AQ1 sensor input and compares it to the conﬁgured set point. The control then calculates the minimum damper position to maintain the set point. If no other control is attempting to adjust the dampers to a more fully open position than the IAQ control, the damper is adjusted to the position determined by the IAQ control. Otherwise, the damper is positioned by the superseding control routine or at its conﬁgured minimum position.

Systems with TwoAQ Sensors (Separate Readings) — The preceding sequence for the AQ1 sensor also applies to the AQ2 sensor, but the damper position is determined by either the AQ1 or the AQ2 sensor according to which sensor value demands the more fully open damper position.

Systems with TwoAQ Sensors (Differential Check) — If differential sensing is conﬁgured for two VOC sensors, the control reads the AQ2 (outside air) sensor to determine if its value is greater or less than that of the AQ1 (indoor air) sensor. If the AQ2 value is greater than the value of the AQ1 sensor, the mixed-air damper position is set to 0. If the AQ2 value is less than the AQ1 value (by at least 1% of the conﬁgured minimum sensor value), the control uses the AQ1 value to modulate the dampers and maintain the AQ set point.

IAQ System Protection — To protect the system against coil freeze-up in cold climates or high heat and humidity in warm climates, the system provides several user-selectable features to override or modify the IAQ functions. An adjustable maximum position for the mixed-air damper is provided for each AQ sensor, and a selection is available to maintain the minimum mixed-air temperature at approximately 45 F.Space temperature and humidity protection can temporarily suspend IAQ functions until the temperature and humidity conditions return to the desired set points. On VAV systems during cooling, the IAQ function can be limited to maintain the required supply-air temperature.

Fig. 76 — Indoor-Air Quality (IAQ) Control Operation

LEGEND

AQ — Air Quality Sensor IAQ — Indoor-Air Quality MAT — Mixed-Air Temperature OAT — Outdoor-Air Temperature RH — Relative Humidity SAT — Supply-Air Temperature SPT — Space Temperature VAV — Variable Air Volume

SMOKE CONTROL — When the 39L or 39NX unit is equipped with an optional smoke control and a ﬁre system is installed, 4 modes are provided to control smoke within areas serviced by the air-handling unit. Each mode must be energized individually from the approved building ﬁre alarm system, and the corresponding alarm is then generated at the local interface device or Building Supervisor.

The system must include a separate return fan and an ex-

haust air damper witha4to20mAactuator.

The building ﬁre alarm system must provide 4 normallyopen dry contact closures and a double-pole, double-throw (DPDT) relay (24 vac coil, contacts rated 10 amps at 240 vac) for the Fire Shutdown mode.

Fire Shutdown Mode — The ﬁre alarm system must provide a normally-open dry contact closure which, when activated, energizes the Fire Shutdown mode.

When the Fire Shutdown mode is energized, the supply and return fans stop, the outside and exhaust air dampers close, and the return-air dampers open.

This mode remains in effect as long as the input signal is maintained at the ﬁre system panel. An alarm is generated from this input and sent to the Building Supervisor. In order for this mode to be initiated, the input signal must be maintained for no less than 2 seconds.

Evacuation Mode — The building ﬁre alarm system must provide a normally-open dry contact closure which, when activated, energizes the Evacuation mode. When the Evacuation mode is energized, the supply fan shuts down, the return fan starts, the outside-air and return-air dampers close, and the exhaust air dampers open.

This mode remains in effect for as long as the input signal is maintained at the ﬁre system panel. An alarm is generated from this input and sent to the Building Supervisor. In order for this mode to be initiated, the input signal must be maintained for no less than 2 seconds.

Pressurization Mode — The building ﬁre alarm system must provide a normally-open dry contact closure which, when activated, energizes the Pressurization mode. When the Pressurization mode is energized, the supply fan starts, the return fan shuts down, the outside dampers open, and the exhaust and return-air dampers close.

Smoke Purge Mode — The building ﬁre alarm system must provide a normally-open dry contact closure which, when activated, energizes the smoke purge mode.

When the smoke purge mode is energized, the supply fan starts, the return fan starts, the outside air and exhaust air dampers open and the return-air dampers close.

ADAPTIVE OPTIMAL START — Optimal Start is used to heat up or cool down the space prior to occupancy. The purpose is to have the space temperature approach and then achieve the occupied set point by time of occupancy. The control uses outdoor-air temperature, space temperature, occupied

set point, and a ‘K’ factor in minutes/degrees to calculate a start time offset, which is the time in minutes that the system should be started in advance of the occupied time. The control monitors its results and adjusts the K factor to assure that the Occupied set point is achieved at time of occupancy.

Constant Volume Units Only

HEATINGCOILCONTROL — The heating coil control adjusts the steam or hot water valve. The valve is modulated to prevent the space temperature from falling below the desired set point.

If the supply fan is OFF, the heating valve is modulated

to maintain a desired minimum duct temperature (fan off value).

If the fan is ON, the system reads the space sensor and computes the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature and the heating coil valve modulates to the required position.

CHILLED WATER COIL COOLING CONTROL — The cooling coil control adjusts the chilled water valve. The valve is modulated to prevent space temperature from exceeding the desired set point. The valve holds its normal position if the space temperature is below the set point or the supply fan is OFF.

If the fan is ON, the control reads the humidity sensor (if supplied) and compares the value to the high humidity limit.

If the humidity is higher than the high humidity limit, the chilled water valve fully opens.

If the humidity is below the high humidity limit, the control reads the space temperature sensor and computes the supplyair temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature and the chilled water valve modulates to the position required to maintain desired conditions.

See Fig. 77 for cooling coil operation ﬂow chart. DIRECT EXPANSION COOLING CONTROL — The

direct expansion (DX) cooling control regulates the DX cooling system. The DX cooling stages are energized and deenergized to prevent the space temperature from exceeding the desired set point. The stages remain off if the space temperature is below the set point or the supply fan is OFF.

If the supply fan is ON, the control reads the humidity sensor (if supplied) and compares the value to the high humidity limit. If the humidity is higher than the high humidity limit, the DX cooling stages are energized to maintain a minimum supply-air temperature. If the humidity is below the limit, the control reads the space temperature sensor and computes the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature and the required DX cooling stages are energized to maintain the desired conditions.

See Fig. 77 for cooling operation and Fig. 78 for DX submaster gain operation. For more complete information, refer to the Application Data book for Product Integrated Controls with DX Cooling.

Fig. 77 — Cooling (DX and Chilled Water) Control Operation

LEGEND

CCV — Cooling Coil Valve CV — Constant Volume DX — Direct Expansion RAT — Return-Air

Temperature

RH — Relative Humidity

DX — Direct Expansion MAT — Mixed-Air Temperature RAT — Return-Air Temperature SAT — Supply-Air Temperature

Fig. 78 — DX Submaster Gain Control Operation

LEGEND

MIXED-AIR DAMPER CONTROL — The mixed-air damper control adjusts modulating outside-air, return-air,and exhaustair dampers. When outside air conditions are unsuitable for atmospheric cooling, the dampers are held to an adjustable minimum outside air position. When outside air conditions are suitable for atmospheric cooling, the mixed-air dampers are modulated to maintain a space temperature that is between the heating and cooling set points in an effort to minimize the need for heating or mechanical cooling. The damper set point is automatically adjusted as a function of outdoorair temperature or can be set to a ﬁxed value by the user.

If the supply fan is OFF, the mixed-air dampers are kept

closed to outside air and open to return air.

If the fan is ON, the system checks to see if the system is in the HEATmode. If system is in the HEATmode, the mixedair dampers are held in the minimum position.

If the system is not in the HEAT mode, it determines if the outside conditions are suitable for atmospheric cooling. The control compares the outdoor-air temperature to the space temperature. If the outdoor-air temperature is less than the space temperature, the system does either an enthalpy check (using an outside-air enthalpy switch) or a differential enthalpy check. (Return-air temperature is compared to returnair relative humidity for return-air differential enthalpy.Outsideair temperature is compared to outside-air relative humidity for outside-air differential enthalpy.)

The control then determines if the outdoor-air temperature is below the Nighttime Free Cool Lockout (NTLO). If so, the damper set point is changed to 1.0 degree less than the Occupied Cooling set point, allowing the system to use return air during the heating mode.

If the outdoor-air temperature is higher than 68 F, the control sets the damper set point to 1.0 degree higher than the Occupied Heating set point to provide cooling, allowing the system to use outside air.

If the outdoor-air temperature is higher than NTLO but less than 68 F, the system sets the damper set point halfway between the Occupied Heating and Occupied Cooling set points to provide ventilation.

If outside conditions are suitable, the control compares the space temperature to the damper set point and computes the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the mixed-air temperature sensor value (if installed), otherwise the supply-air temperature sensor determines the damper position. The damper adjustment rate is limited to 5% per minute if the outside-air temperature is less than 40 F. This rate limit prevents nuisance low temperature thermostat tripping.

ELECTRIC HEATER CONTROL — Electric heater staging regulates the electric heater. The heater is staged to prevent the space temperature from falling below the desired set point. (The number of heat stages is factory set for each unit’s heater.)

If the supply fan is OFF, all stages of electric heat are turned off.

If the fan is ON, the control reads the space temperature sensor and calculates the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature to determine the number of heat stages required to satisfy conditions. The required stages are energized one at a time, with 2-second intervals between stages.

ADAPTIVE OPTIMALSTOP—Optimal stop allows the space temperature to drift to an expanded occupied set point during the last portion of an occupied period. The control calculates a stop time offset, which is the time in minutes prior to the scheduled unoccupied time, during which expanded set points can be used. Adaptive optimal stop utilizes space temperature, an expanded Occupied set point, and a K factor to calculate stop time offset. The amount to expand the Occupied set point is user conﬁgurable. Like adaptive optimal start, the control corrects itself for optimal operation by adjusting the K factor.

TWO-STEP DEMAND LIMITING (Available on Units Connected to the Carrier Comfort Network Only) — If the Demand Limit option is enabled, the control receives and accepts redline alert and loadshed commands from the Network Loadshed option. See the CCN Loadshed manual for additional information.

When a redline alert is received, the Control decreases the Occupied Heating set point by 2° F and increases the Occupied cooling set point by 2° F.

When a loadshed command is received, the supply fan turns OFF.

The maximum loadshed timer prevents the system from remaining in loadshed, should the control lose communications with the Loadshed option. If the timer expires before the loadshed command is cleared by the Loadshed option, the control clears the loadshed command itself and returns to normal control. The loadshed timer is factory set at 60 minutes.

Variable Air Volume Units Only

CONSTANT OUTSIDE AIR (OAC) — During Occupied periods, this feature provides a continuous ﬂow of outside air into the building. The OAC control modulates the mixedair damper to a conﬁgurable minimum open position to ensure outside air is admitted. During Unoccupied periods, the control signals the dampers to fully close.

To monitor the outside airﬂow during Occupied periods, the OAC control reads the outside-air velocity pressure (OA VP) sensor, compares its value to the OAVP set point, and adjusts the mixed-air dampers to the position required to achieve the conﬁgured velocity pressure.

If a control routine (other than OAC) or the conﬁgured minimum damper position require the dampers to be more fully open than the OAC setting, that routine or position overrides the OAC control. To protect against coil freeze-up in colder climates, the PIC provides selectable low temperature protection to limit the minimum mixed-air temperature to approximately 45 F.

See Fig. 79 for OAC control ﬂowchart.

HEATINGCOILCONTROL — The heating coil control adjusts the steam or hot water valve. Heat is primarily used for morning warm-up or Occupied Heating with the valve modulated to maintain desired return-air temperature.

If the supply fan is OFF, the heating valve is modulated

to maintain a desired minimum duct temperature (fan off value).

If the fan is ON, the system determines if it is in the morning warm-up mode. If it is, the return-air sensor is read and compared to the Occupied Heating set point. If heating is required, the control calculates the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature and the heating coil valve modulates to the required position.

The heat interlock relay is energized whenever there is a need for heat.

Once morning warm-up is completed, heat is activated again unless Occupied Heat has been selected.

During cooling or fan-only operation, heat can also be provided to maintain the supply-air temperature when the amount of cold outside air admitted by the IAQ or OAC controls causes the temperature to fall below the supply-air set point.

CHILLED WATER COIL COOLING CONTROL — The cooling coil control adjusts the chilled water valve. The valve is modulated to maintain desired supply-air temperature set point. The valve is held in its normal position whenever the system is in Nighttime Free Cooling or whenever the supply fan is OFF.

If the fan is ON, the control reads the humidity sensor and compares the value to the high humidity limit.

If the humidity is higher than the humidity limit, the chilled

water valve fully opens.

If the humidity is below the high humidity limit, or if no humidity sensor is supplied, the control reads the supply-air sensor and computes the supply-air temperature required to satisfy conditions, provided that return-air temperature is greater than the Occupied Cooling set point.

Once the required supply-air temperature has been calculated, it is compared to the current supply-air temperature and the chilled water valve modulates to the position required to maintain desired conditions.

See Fig. 77 for cooling operation ﬂowchart. STATICPRESSURE CONTROL — The static pressure con-

trol adjusts the inlet guide vanes (IGVs) or the supply-fan motor inverter in a variable air volume system in order to maintain the duct static pressure set point.

If the supply fan is OFF, the IGVs remain closed or the minimum signal is sent to the inverter.

If the fan is ON, the system reads the duct static pressure sensor and computes the static pressure required to satisfy conditions. The system compares the duct static pressure to the computed value and calculates the required signal that is output to the IGV actuator or the inverter.

FAN VOLUME CONTROL — Fan volume control adjusts the inlet guide vanes or inverter in a VAV system. The return fan IGVs or inverters are modulated to maintain a constant differential cfm value between the supply and return fans in the system.

If the supply fan is OFF, the return fan inlet guide vanes

are closed and no signal is sent to the return fan inverter.

If the supply fan is ON, the control reads the supply fan differentialpressure transmitter and computes the supply cfm. The desired return cfm is calculated by subtracting the differential cfm set point from the calculated supply cfm. The return cfm is read and the return fan differential pressure required to satisfy conditions is calculated.

The calculated return fan differential pressure is compared to the current differential pressure. The signal required to satisfy conditions is sent to the return fan inlet guide vane actuator or return fan inverter.

DIRECT EXPANSION COOLING CONTROL — The direct expansion (DX) cooling control regulates the DX cooling system. The DX cooling stages are energized and deenergized to maintain the desired supply-air temperature set point. Whenever the system is in Nighttime Free Cooling mode or whenever the supply fan is off,the DX cooling stages remain off.

If the supply fan is on, the control reads the humidity sensor (if supplied) and compares the value to the high humidity limit. If the humidity is higher than the high humidity limit, the DX cooling stages are energized to maintain a minimum supply-air temperature. If the humidity is below the limit, the control reads the space temperature sensor and computes the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the actual supply-air temperature and the required DX cooling stages are energized to maintain the desired conditions.

See Fig. 77 for cooling operation and Fig. 78 for DX submaster gain operation. For more complete information, refer to the Application Data book for Product Integrated Controls with DX Cooling

ELECTRIC HEATER CONTROL — Electric heater staging regulates the electric heater. The heater is primarily used for morning warm-up or Occupied Heating, with the heater staged to maintain desired return air temperature. (The number of heat stages is factory set for each unit heater.)

If the supply fan is OFF, all stages of electric heat are turned off.

If the fan is ON, the control determines if the system is in morning warm-up. If it is, the return-air sensor is read and compared to the Occupied Heating set point. If heat is required, the control calculates the supply-air temperature required to satisfy conditions.

Once the required supply-air temperature has been calculated, it is compared to the supply-air temperature to determine the number of heat stages required to satisfy conditions. The required stages are energized sequentially with 2-second intervals between stages and the heat interlock relay is energized. For VAV units, the number of stages turned on is limited by the PIC IGV output.

Once the morning warm-up is completed, heat is not activated again unless OCCUPIED HEAT has been selected.

100

Carrier 39NX user guide manual

Specifications and Main Features

Frequently Asked Questions

User Manual