Sterling 30RA010-055 User Manual

Controls, Start-Up, Operation,

Service, and Troubleshooting

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical components, and equipment location (roof, elevated structures, mechanical rooms, etc.). Only trained, qualified installers and service mechanics should install, start up, and service this equipment.

When working on this equipment, observe precautions in the literature, and on tags, stickers, a nd labels attached to the equipment, and any other safety precautions that apply. Follow all safety codes. Wear safety glasses and work gloves. Use care in handling, rigging, and setting this equipment, and in handling all electrical components.

Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.

DO NOT VENT refrigerant relief valves within a building. Outlet from relief valves must be vented outdoors in accordance with the latest edition of ANSI/ASHRAE (American National Standards Institute/Ame rican Society of Heating, Refrigeration and Air Conditioning Engineers) 15 (Safety Code for Mechanical Refrigeration). The accumulation of refrigerant in an enclosed space can displace oxygen and cause asphyxiation. Provide adequate ventilation in enclosed or low overhead areas. Inhalation of high concentrations of vapor is harmful and may cause heart irregularities, unconsciousness or death. Misuse can be fatal. Vapor is heavier than air and reduces the amount of oxygen available for breathing. Product causes eye and skin irritation. Decomposition products are hazardous.

30RA010-055

AquaSnap® Air-Cooled Chillers

with ComfortLink™ Controls

50/60 Hz

This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

To prevent potential damage to heat exchanger, always run fluid through heat exchanger when adding or removing refrigerant charge. Use appropriate brine solutions in cooler fluid loop to prevent the freezing of brazed plate heat exchanger, option al hydronic section and/or interconnecting piping when the equipment is exposed to temperatures below 32 F (0 °C). Proof of flow switch and strainer are factory installed on all models. Do NOT remove power from this chiller during winter shutdown periods without taking precaution to remove all water from heat exchanger and optional hydronic system. Failure to properly protect the system from freezing may constitute abuse and may void warranty.

Compressors and optional hydronic system pumps require specific rotation. Test condenser fan(s) first to ensure proper phasing. Swap any two incoming power leads to correct condenser fan rotation before starting any other motors.

Refrigerant charge must be removed slowly to prevent loss

DO NOT attempt to unbraze factory joints w hen servicing this equipment. Compressor oil is flammable and there is no way to detect how much oil may be in any of the refrigerant lines. Cut lines with a tubing cutter as re quired when performing service. Use a pan to catch any oil that may come out of the lines and as a gage for how much oil to add to system. DO NOT re-use compressor oil.

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

Book 2 Ta b 5 c

PC 903 Catalog No. 533-00047 Printed in U.S.A. Form 30RA-2T Pg 1 1-03 Replaces: 30RA-1T

of compressor oil that could result in compressor failure.

CONTENTS

Page

SAFETY CONSIDERATIONS GENERAL MAJOR SYSTEM COMPONENTS

General Main Base Board (MBB) Scrolling Marquee Display Energy Management Module (EMM) Enable/Off/Remote Contact Switch Emergency On/Off Switch Board Addresses Control Module Communication Sterlco Comfort Network Interface OPERATING DATA Sensors

• T1 — COOLER LEAVING FLUID SENSOR

• T2 — COOLER ENTERING FLUID SENSOR

• T7,T8 — COMPRESSOR RETURN GAS TEMPERATURE SENSOR (ACCESSORY)

• T9 — OUTDOOR-AIR TEMPERA TURE SENSOR

• T10 — REMOTE SPACE TEMPERATURE SENSOR OR DUAL LEAVING WATER TEMPERATURE SENSOR

Energy Management Module Loss-of-Cooler Flow Protection Thermostatic Expansion Valves (TXV) Capacity Control

• MINUTES LEFT FOR START

• MINUTES OFF TIME

• LEAD/LAG DETERMINATION

• CAPACITY CONTROL OVERRIDES

Head Pressure Control Operation of Machine Based on Control Method

and Cooling Set Point Selection Settings Cooling Set Point Select Marquee Display Usage Service Test Optional Factory-Installed Hydronic Package Cooler Pump Control Cooler Pump Sequence of Operation Configuring and Operating Dual Chiller Control Temperature Reset Demand Limit

• DEMAND LIMIT (2-Stage Switch Controlled)

• EXTERNALLY POWERED DEMAND LIMIT

(4 to 20 mA Controlled)

• DEMAND LIMIT (SCN Loadshed Controlled)

Cooling Set Point (4 to 20 mA) TROUBLESHOOTING Complete Unit Stoppage and Restart

• GENERAL POWER FAILURE

• UNIT ENABLE-OFF-REMOTE CONTACT SWITCH IS

OFF

• CHILLED FLUID PROOF-OF-FLOW SWITCH OPEN

• OPEN HIGH-PRESSURE SWITCH(ES)

• OPEN COMPRESSOR INTERNAL THERMAL

PROTECTION

• OPEN 24-V CONTROL CIRCUIT BREAKERS

• COOLING LOAD SATISFIED

• THERMISTOR FAILURE

• LOW SATURATED SUCTION

Alarms and Alerts SERVICE Electronic Components

• CONTROL COMPONENTS

Compressor Replacement Cooler

• BRAZED-PLATE COOLER HEAT EXCHANGER

REPLACEMENT

• BRAZED-PLATE COOLER HEAT EXCHANGER

CLEANING

Check Oil Charge

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Page

Condenser Section and Coils

• COIL CLEANING

• CLEANING E-COATED COILS

• CONDENSER SECTION

Check Refrigerant Feed Components

• THERMOSTATIC EXPANSION VALVE (TXV)

•FILTER DRIER

• MOISTURE-LIQUID INDICATOR

• MINIMUM LOAD VALVE

• PRESSURE RELIEF DEVICES

Compressor and Unit Protective Devices

• MANUAL STARTER

• COMPRESSOR INTERNAL THERMAL PROTECTION

Check Unit Safeties

• HIGH-PRESSURE SWITCH

• PRESSURE TRANSDUCERS

• COOLER FREEZE-UP PROTECTION

• HEATER CABLE

• WINTER SHUTDOWN

Thermistors Pressure Transducers Flow Sensor Strainer Motormaster® V Controller

• GENERAL OPERATION

• SET POINTS

•INSTALLATION

• PROGRAMMING

•EPM CHIP

• LIQUID LINE PRESSURE SET POINT ADJUSTMENT

• LOSS OF SCN COMMUNICATIONS

• REPLACING DEFECTIVE MODULES

Hydronic Package MAINTENANCE

Recommended Maintenance Schedule PRE-START-UP System Check START-UP AND OPERATION Actual Start-Up Check Refrigerant Charge Operating Limitations

• TEMPERATURES

• LOW AMBIENT OPERATION

• VOLTAGE — ALL UNITS

OPERATION SEQUENCE APPENDIX A — SCN TABLES APPENDIX B — FACTORY SETTINGS FOR

COMPRESSOR, FAN, PUMP AND MANUAL

STARTERS APPENDIX C — BUILDING INTERFACE START-UP CHECKLIST FOR 30RA LIQUID

CHILLER

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GENERAL

This publication contains Controls Start-Up, Service, Operation, and Troubleshooting information for the 30RA AquaSnap® air-cooled chillers. Se e Table 1. These chillers are equipped with ComfortLink™ controls and conventional thermostatic expansion valves (TXVs).

This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out or bypass components or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the board or electrical component.

Table 1 — Unit Sizes

NOMINAL CAPACITY

(TONS) 50/60 Hz

10/10 14/13 16/16 22/20 24/23

27 30

35/34

38 40

43/45

47 54

*60 Hz only.

†50 Hz only.

UNIT

30RA010

30RA015

30RA018

30RA022

30RA025

30RA030*

30RA032†

30RA035

30RA040*

30RA042†

30RA045

30RA050*

30RA055*

MAJOR SYSTEM COMPONENTS

General —

contain the ComfortLink™ electronic control system that controls and monitors all operations of the chiller.

The control system is composed of several components as listed in the sections below. See Fig. 1 and 2 for typical control box drawing. See Fig. 3-6 for control schematics.

Main Base Board (MBB) —

the heart of the ComfortLink control system. It contains the major portion of operating software and controls the ope ration of the machine. The MBB continuously monitors input/output channel information received from its inputs and from all other modules. The MBB receives inputs from the discharge and suction pressure transducers and thermistors. See Table 2. The MBB also receives the feedback inputs from each compressor contactor, auxiliary contacts, and other status switches. See T a ble 3. The MBB also controls several outputs. Relay outputs controlled by the MBB are shown in Table 4. Information is transmitted between modules via a 3-wire communication bus or LEN (Local Equipment Network). The SCN (Sterlco Comfort Network) bus is also supported. Connections to both LEN and SCN buses are made at TB3. See Fig. 8.

Scrolling Marquee Display —

is the keypad interface used for accessing chiller information, reading sensor values, and testing the chiller. The marquee display is a 4-key, 4-character , 16-segment LED (light-emitting diode) display. Eleven mode LEDs are loca ted on the display as well as an Alarm Status LED. See Marquee Display Usa ge section on page 23 for further details.

Energy Management Module (EMM) —

module is available as a factory-installed option or as a fieldinstalled accessory. The EMM module receives 4 to 20 mA inputs for the leaving fluid temperature reset, cooling set point and demand limit functions. The EMM module also receives the switch inputs for the field-installed 2-stage demand limit and ice done functions. The EMM module communicates the status of all inputs with the MBB, and the MBB adjusts the control point, capacity limit, and other functions according to the inputs received.

Enable/Off/Remote Contact Switch —

Off/Remote Contact switch is a 3-position switch used to control the chiller. When switched to the Enable position the chiller is under its own control. Move the switch to the Off position to shut the chiller down. Move the switch to the Remote Contact position and a field-installed dry contact can be used to start the chiller. The contacts must be capable of handling a 24 vac, 50-mA load. In the Enable and Remote

The 30RA air-cooled reciprocating chillers

See Fig. 7. The MBB is

This standard device

The EMM

The Enable/

Contact (dry contacts closed) positions, the chiller is allowed to operate and respond to the scheduling configuration, SCN configuration and set point data. See Fig. 8.

Emergency On/Off Switch —

The Emergency On/Off switch should only be used when it is required to shut the chiller off immediately. Power to the MBB, EMM, and marquee display is interrupted when this switch is off and all outputs from these modules will be turned off.

Board Addresses —

The Main Base Board (MBB) has a 3-position Instance jumper that must be set to ‘1.’ All other boards have 4-position DIP switches. All switches are set to ‘On’ for all boards.

Control Module Communication

RED LED — Proper operation of the control boards can be visually checked by looking at the red status LEDs (light-emitting diodes). When operating correctly, the red status LEDs should be blinking in unison at a rate of once every 2 seconds. If the red LEDs are not blinking in unison, verify that correct power is being supplied to all modules. Be sure that the Main Base Board (MBB) is supplied with the current software. If necessary, reload current software. If the problem still persists, replace the MBB. A red LED that is lit continuously or blinking at a rate of once per second or faster indicates that the board should be replaced.

GREE N LED — The MBB has one green LED. The Local Equipment Network (LEN) LED should always be blinking whenever power is on. All other boards have a LEN LED which should be blinking whenever power is on. Check LEN connections for potential communication errors at the board J3 and/or J4 connectors. Communication between modules is accomplished by a 3-wire sensor bus. These 3 wires run in parallel from module to module. The J4 connector on the MBB provides both power and communication directly to the marquee display only.

YELLOW LED — The MBB has one yellow LED. The Sterlco Comfort Network (SCN) LED will blink during times of network communication.

Sterlco Comfort Network (SCN) Interface —

The 30RA chiller units can be connected to the SCN if desired. The communication bus wiring is a shielded, 3-conductor cable with drain wire and is supplied and installed in the field. See Table 5. 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 elements on either side of it. This is also required for the negative and signal ground pins of each system element. Wiring connections for SCN should be made at TB3. Consult the SCN Contractor’s Manual for further information.

NOTE: Conductors and drain wire must be 20 AWG (American Wire Gage) 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. Wire manufactured by Alpha (2413 or 5463), American (A22503), Belden (8772), or Columbia (02525) meets the above mentioned requirements.

It is important when connecting to a SCN communication bus that a color coding scheme be used for the entire network to simplify the installation. It is recommended that red be used for the signal positive, black for the signal negative, and white for the signal ground. Use a similar scheme for cables containing different colored wires.

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 a ground at one point only. If the communication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building (one point per building only). To connect the unit to the network:

1. Turn off power to the control box.

2. Cut the SCN wire and strip the ends of the red (+), white (ground), and black (–) conductors. (Substitute appropriate colors for different colored cables.)

3. Connect the red wire to (+) terminal on TB3 of the plug, the white wire to COM terminal, and the black wire to the (–) terminal.

4. The RJ14 SCN connector on TB3 can also be used, but is only intended for temporary connection (for example, a laptop computer running Service Tool).

Table 4 — Output Relays

RELAY

NO.

Energize Compressor A1 (010-030)

Energize Compressor A1 and Condenser Fan A1 (032-055) Energize Compressor B1 and Condenser Fan B1 at Low

Speed (032-040)

Energize Compressor B1 and Condenser Fan B1 (042-055)

K3 Energize Chilled Water Pump 1 Output K4 Energize Chilled Water Pump 2 Output K5 Energize Compressor A2 (all but 010, 015 60Hz) K6 Energize Compressor B2 (042-055 only) K7 Alarm Relay K8 Cooler/Pump Heater

Energize Condenser Fan at Low Speed (010-018) Energize Condenser Fan A1 (022-030)

Energize Condenser Fan A2 (032-055) Energize Condenser Fan at High Speed (010-018)

Energize Condenser Fan A2 (022-030)

K10

Energize Condenser Fan B1 at High Speed (032-040) Energize Condenser Fan B2 (042-055)

K11 Minimum Load Valve

DESCRIPTION

IMPORTANT: A shorted SCN bus cable will prevent some routines from running and may prevent the unit from starting. If abnormal conditions occur, unplug the connector. If conditions return to normal, check the SCN connector and cable. Run new cable if necessary. A short in on e section of the bus can cause problems with all system elements on the bus.

Table 2 — Thermistor Designations

THERMISTOR

NO.

T1 J8-13,14 (MBB) Cooler Leaving Fluid T2 J8-11,12 (MBB) Cooler Entering Fluid

T10

LW T — Leaving Water Temperature MBB — Main Base Board

LEGEND

CONNECTION

POINT

J8-1,2 (MBB) Circuit A Return Gas

J8-3,4 (MBB) Circuit B (032-055 only) Return

J8-7,8 (MBB) Outdoor-Air Temperature

J8-5,6 (MBB) TB5-5,6

THERMISTOR INPUT

Temperature (Accessor y)

Gas Temperature (Accessory)

Sensor Accessory Remote Space

Temperature Sensor or Dual LWT Sensor

Table 3 — Status Switches

STATUS

SWITCH Chilled Water Pump 1 J7-1,2 Chilled Water Pump 2 J7-3,4

Remote On/Off TB5-9,10

Cooler Flow Switch J7-9,10 Compressor Fault Signal, A1 J9-11,12 Compressor Fault Signal, A2 J9-5,6 Compressor Fault Signal, B1 J9-8,9 Compressor Fault Signal, B2 J9-2,3

PIN CONNECTION

POINT

Table 5 — SCN Communication Bus Wiring

MANUFACTURER

Alpha 1895 — American A21451 A48301 Belden 8205 884421 Columbia D6451 — Manhattan M13402 M64430 Quabik 6130 —

Regular Wiring Plenum Wiring

PART NO .

OPERATING DATA

Sensors —

The electronic control uses 3 to 6 thermistors to sense temperatures for controlling chiller operation. See T able 2. These sensors are outlined below. Thermistors T1, T2, T9 and accessory suction gas temperatures (T7,T8) are 5 kΩ at 77 F (25 C) and are identical in temperature versus resistance and voltage drop performance. Thermistor T10 is 10 kΩ at 77 F (25 C) and has a different temperature vs. resistance and voltage drop performance. See Thermistors section for temperature-resistance-voltage drop characteristics.

T1 — CO OL ER L EAVIN G FL UID SE NSO R — On 30RA010030 sizes, this thermistor is installed in a friction fit well at the bottom of the brazed-plate heat exchanger on the cont rol box side. For 30RA032-055 sizes, this thermistor is installed in a well in the factory-installed leaving fluid piping coming from the bottom of the brazed-plate heat exchanger opposite the control box side.

T2 — C OO L E R E NT E RI N G F L UI D SE N SO R — On 30RA010030 sizes, this thermistor is installed in a friction fit well at the top of the brazed-plate heat exchanger on the control box side. For 30RA032-055 sizes, this thermistor is installed in a well in the factory-installed entering fluid piping coming from t he top of the brazed-plate heat exchanger opposite the control box side.

T7,T8 — COMPRESSOR RETURN GAS TEMPERATURE SENSOR (ACCESSORY) — A well for this sensor is factory installed in each circuit's suction line. If desired, a 5 kΩ thermistor (Sterling part number HH79NZ029) can be installed in this well and connected to the Main Base Board as shown in Tabl e 2. Use the Scrolling Marquee display to configure the sensor (Configuration mode, sub-mode OPT1 — enable item RG.EN).

T9 — OUTDOOR-AIR TEMPERATURE SENSOR — This sensor is factory-installed on a bracket at the left side of compressor A1 on 30RA010-030 models. For models 30RA032-055, it is installed behind the panel below the control box center door.

T10 — REMOTE SPACE TEMPERATURE SENSOR OR DUAL LEAVING WATER TEMPERATURE SENSOR —

One of two inputs can be connected to TB5-5 and TB5-6. See appropriate sensor below.

T10 — Remote Space Temperature Sensor

— Sensor T10 (part no. 33ZCT55SPT) is an accessory sensor that is remotely mounted in the controlled space and used for space temperature reset. The sensor should be installed as a wall-mount ed thermostat would be (in the conditioned space where it will not be subjected to either a cooling or heating source or direct exposure to sunlight, and 4 to 5 ft above the floor).

Space temperature sensor wires are to be connected to terminals in the unit main control box. T he space temperature sensor includes a terminal block (SEN) and a RJ11 female connector. The RJ11 connector is used access into the Sterlco Comfort Network (SCN) at the sensor.

T o connect the space temperature sensor (Fig. 9):

1. Using a 20 AWG twisted pair conductor cable rated for the application, connect 1 wire of the twisted pair to one SEN terminal and connect the other wire to the other SEN terminal located under the cover of the space temperature sensor.

2. Connect the other ends of the wires to terminals 5 and 6 on TB5 located in the unit control box.

Units on the SCN can be monitored from the space at the sensor through the RJ11 connector, if desired. To wire the RJ11 connector into the SCN (Fig. 10):

IMPORTANT: The cable selected for the RJ11 connector wiring MUST be identical to the SCN communication bus wire used for the entire network. Refer to Table 5 for acceptable wiring.

1. Cut the SCN wire and strip ends of the red (+), white (ground), and black (–) conductors. (If another wire color scheme is used, strip ends of appropriate wires.)

2. Insert and secure the red (+) wire to terminal 5 of the space temperature sensor terminal block.

3. Insert and secure the white (ground) wire to terminal 4 of the space temperature sensor.

4. Insert and secure the black (–) wire to terminal 2 of the space temperature sensor.

5. Connect the other end of the communication bus cable to the remainder of the SCN communication bus.

T10 — Dual Leaving Water Temperature Sensor

— For dual chiller applications (parallel only are supported), connect the dual chiller leaving fluid temperature sensor (5 k Ω ther- mistor, Sterling part no. HH79NZ029) to the space temperature input of the Master chiller. If space temperature is required for reset applications, connect the sensor to the S lave chiller and configure the slave chiller to broadcast the value to the Master chiller.

LEGEND FOR FIG. 1-6

ALMR — Alarm Relay BR — Boiler Relay C—Contactor, Compressor CB — Circuit Breaker CCB — Compressor Circuit Breaker CHC — Cooler/Pump Heater Contactor COMP — Compressor CWFS — Chilled Water Flow Switch CWP — Chilled Water Pump DPT — Discharge Pressure Transducer EMM — Energy Management FIOP — factory Installed Option FM — Fan Motor GND — Ground HPS — High-Pressure Switch HR — Heat Relay ICP — Inrush Current Protection IP — Internal Protection Thermostat LW T — Leaving Water Temperature MBB — Main Base Board MLV — Minimum Load Valve MS — Manual Starter OAT — Outdoor-Air Thermistor OL — Overload R—Relay SPT — Suction Pressure Transducer SW — Switch T—Thermistor TB — Te r mi na l B l oc k TNKR — Storage Tank Heater Relay TRAN — Transformer

Te r m in al Bl o ck

Terminal (Unmarked)

Terminal (Marked)

Splice

Factory Wiring

Field Wiring

Accessory or Option Wiring

To indicate common potential only; not to represent wiring.

Fig. 1 — Typical Control Box for 30RA010-030 (022-030 Shown)

Fig. 2 — Typical Control Box for 30RA032-055 (042-055 Shown)

30RA010-018 AQUA SNAP

Fig. 3 — Wiring Schematic 30RA010-018

AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (010-018)

SEE NOTE 8

Fig. 3 — Wiring Schematic 30RA010-018 (cont)

30RA022-030 AQUA SNAP

Fig. 4 — Wiring Schematic 30RA022-030

AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (022-030)

Fig. 4 — Wiring Schematic 30RA022-030 (cont)

30RA032-040 AQUA SNAP

Fig. 5 — Wiring Schematic 30RA032-040

AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (032-040)

Fig. 5 — Wiring Schematic 30RA032-040 (cont)

30RA042-055 AQUA SNAP

Fig. 6 — Wiring Schematic 30RA042-055

AQUA-SNAP LOW VOLTAGE CONTROL SCHEMATIC (042-055)

Fig. 6 — Wiring Schematic 30RA042-055 (cont)

RED LED - STATUS GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

CEPL130346-01

YELLOW LED SCN (STERLCO COMFORT NETWORK)

INSTANCE JUMPER

K11

K10 K9

Run Status

Service Test

Temperature

Pressures

Setpoints

Inputs

Outputs

Configuration

Time Clock

Operating Modes

Alarms

MODE

Alarm Status

ESCAPE

LEN

SCN

STATUS

Fig. 7 — Main Base Board

ENTER

SW1

SW2

REMOTE

CONTACT

ENABLE

OFF

CB1

OFF

K3 K2

TB3

LEN

SCN

(COM)

SHIELD

J10

ENABLE/OFF/REMOTE CONTACT SWITCH

(+)

SCN

(-)

COMMUNICATIONS

EMERGENCY ON/OFF SWITCH

CB2

Fig. 8 — LEN/SCN Interface, Enable/Off/Remote Contact Switch, and Emergency On/Off Switch Locations

SPT (T10) PART NO. 33ZCT55SPT

SENSOR

SEN

TB5

Fig. 9 — Typical Space Temperature

Sensor Wiring

T-55 SPACE SENSOR

TO SCN COMM 1 BUS (PLUG) AT UNIT

SCN+

SCN GND

SCN-

Fig. 10 — SCN Communications Bus Wiring

to Optional Space Sensor RJ11 Connector

Energy Management Module (Fig. 11) —

This factory-installed option (FIOP) or field-installed accessory is used for the following types of temperature reset, demand limit, and/or ice features:

• 4 to 20 mA leaving fluid temperature reset (requires

field-supplied 4 to 20 mA generator)

• 4 to 20 mA cooling set point reset (requires field-

supplied 4 to 20 mA generator)

• Discrete inputs for 2-step demand limit (requires field-

supplied dry contacts capable of handling a 24 vac, 50 mA load)

• 4 to 20 mA demand limit (requires field-supplied 4 to

20 mA gener ator)

• Discrete input for Ice Done switch (requires field-

supplied dry contacts capable of handling a 24 vac, 50 mA load)

See Demand Limit and Temperature Reset sections on

pages 44 and 43 for further details.

Care should be taken when interfacing with other manufacturer’s control systems due to possible power supply differences, full wave bridge versus half wave rectification. The two different power supplies cannot be mixed. ComfortLink™ controls use half wave rectification. A signal isolation device should be utilized if a full wave bridge signal generating device is used.

Loss-of-Cooler Flow Protection —

A proof-of-cooler flow device is factory installed in all chillers. It is recommended that proper operation of the switch be verified on a regular basis .

Thermostatic Expansion Valves (TXV) —

All units

are equipped from the factory with conventional TXVs. Each

refrigeration circuit is also supplied with a factory-installed liquid line filter drier and sight glass.

The TXV is set at th e factory to maintain approxim ately 8 to 12° F (4.4 to 6.7° C) suction superheat leaving the cooler by metering the proper amount of refrigerant into the cooler. All TXVs are adjustable, but should not be adjusted unless absolutely necessary.

The TXV is designed to limit the cooler saturated suction temperature to 55 F (12.8 C). This makes it possible for unit to start at high cooler fluid temperatures without overloading the compressor.

Capacity Control —

The control system cycles compressors, and minimum load valve solenoids (if equipped) to maintain the user-configured leaving chilled fluid temperat ure set point. Entering fluid temperature is used by the Main Base Board (MBB) to determine the temperature drop across the cooler and is used in determining the optimum time to add or subtract capacity stages. The chilled fluid temperature set point can be automatically reset by the return fluid temperature, space, or outdoor-air temperature reset features. It can also be reset from an external 4 to 20-mA signal (requires Energy Management Module FIOP or accessory).

The control has an automatic lead-lag feature built in which determines the wear factor (combination of starts and run hours) for each compressor. If all compressors are off and less than 30 minutes has elapsed since the last compressor was turned off, the wear factor is used to determine which compressor to start next. If no compressors have been running for more than 30 minutes and the leaving fluid temperature is greater than the saturated condensing temperature, the wear factor is still used to determine which compressor to start next. If the leaving fluid temperature is less than the saturat ed condensing temperature, then the control will start either compressor A1 or compressor B1 first, depending on the user-configurable circuit lead-lag value.

The TXVs will provide a controlled start-up. During startup, the low pressure logic will be bypa ssed for 2

/2 minutes to allow for the transient changes during start-up. As additional stages of compression are required, the processor control will add them. See Table 6 and 7.

If a circuit is to be stopped, the compressor with t he lowe st wear factor will be shut off first in most cases. Certain override conditions may shut off the smaller of two compressors on a circuit first.

The capacity control algorithm runs every 30 seconds. The algorithm attempts to main tain the Control Point at the desired set point. Each time it runs, the control reads the entering and leaving fluid temperatures. The control determines t he rate at which conditions are changing and calculates 2 variables based on these conditions. Next, a capacity ratio is calcul ated using the 2 variables to determine whether or not to make any changes to the current stages of capacity. This ratio value ranges from –100 to +100%. If the next stage of capacity is a compressor, the control starts (stops) a compressor when the ratio reaches +100% (–100%). If installed, the minimum load valve solenoid will be energized with the first stage of capacity. Minimum load valve value is a fixed 30% in the total capacity calculation. The control will also use the minimum load valve solenoid as the last stage of capacity before turning off the last compressor. If the close control feature (CLS.C) [Configuration, OPT2] is enabled the control will use the minimum load valve solenoid whenever possible to fine tune leaving fluid temperature control. A delay of 90 seconds occurs after each capacity step change. Refer to Tables 6 and 7.

CEBD430351-0396-01C

PWR

J4 J3

RED LED - STATUS

LEN

STATUS

GREEN LED LEN (LOCAL EQUIPMENT NETWORK)

Fig. 11 — Energy Management Module

ADDRESS DIP SWITCH

TEST 1

CEPL130351-01

TEST 2

Table 6 — Part Load Data Percent Displacement, Standard Units without Minimum Load Valve

30RA UNIT SIZE

010,015 (60 Hz)

015 (50 Hz), 018

022 (60 Hz)

022 (50 Hz), 025, 030

032, 035 (60 Hz)

035 (50 Hz)

040

042, 045 (50 Hz), 050,

055

045 (60 Hz)

NOTE: These capacity steps may vary due to different capacity staging sequences.

CONTROL

STEPS

1 100 A1 —— 150A1——

2 100 A1,A2 —— 142A1——

2 100 A1, A2 —— 150A1 ——

2 100 A1,A2 —— 1 25A1 40B1

2 60 A1,A2 65 A1,B1 3 100 A1,A2,B1 100 A1,A2,B1

1 33A1 33B1 2 67 A1, A2 67 A1, B1 3 100 A1, A2, B1 100 A1, A2, B1

1 32A1 37B1 2 63 A1, A2 68 A1, B1 3 100 A1, A2, B1 100 A1, A2, B1

1 25A1 25B1 2 50 A1,B1 50 A1,B1 3 75A1,A2,B1 75A1,B1,B2

4 100 A1,A2,B1,B2 100 A1,A2,B1,B2

1 22A1 22B1 2 44 A1,B1 44 A1,B1

3 72A1,A2,B1 72A1,B1,B2

4 100 A1,A2,B1,B2 100 A1,A2,B1,B2

% Displacement Compressor % Displacement Compressor

LOADING SEQ A LOADING SEQ B

Table 7 — Part Load Data Percent Displacement, Standard Units with Minimum Load Valve

30RA UNIT SIZE

010 (50/60 Hz)

015 (60 Hz)

015 (50 Hz)

018 (50/60 Hz)

022 (50/60 Hz)

025 (50/60 Hz)

030

032

035 (50/60 Hz)

040

042

045 (60 Hz)

045 (50 Hz), 050

055

*Minimum Load Valve energized. NOTE: These capacity steps may vary due to different capacity

staging sequences.

CONTROL

STEPS

1 2

1 2 3

1 2 3 4

1 2 3 4 5

% Displacement Compressor % Displacement Compressor

69/ 71

100/100

32/ 31 50/ 50

100/100

27/ 35 42/ 50

100/100

38/ 37 50/ 50

100/100

16/25 25/33 60/67

LOADING SEQ A LOADING SEQ B

100

28 50

100

39 50

100

15 25 60

100

24 32 63

100

18 25 50 75

100

15 22 44 72

100

19 25 50 77

100

20 25 50 75

100

A1*

A1,A2

A1*

A1,A2

A1*

A1,A2

A1*

A1,A2

A1*

A1,A2

A1*

A1,A2

A1,A2,B1

A1*

A1,A2

A1,A2,B1

A1*

A1,A2

A1,A2,B1

A1*

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1*

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1*

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1*

A1,B1

A1,A2,B1

A1,A2,B1,B2

— —

— — —

30 40 65

100

32/25 40/33 65/67

100

29 37 68

100

18 25 50 75

100

15 22 44 72

100

19 25 50 77

100

20 25 50 75

100

— —

— — —

B1*

A1,B1

A1,A2,B1

B1*

A1,B1

A1,A2,B1

B1*

A1,B1

A1,A2,B1

B1*

A1,B1

A1,B1,B2

A1,A2,B1,B2

B1*

A1,B1

A1,B1,B2

A1,A2,B1,B2

B1*

A1,B1

A1,B1,B2

A1,A2,B1,B2

B1*

A1,B1

A1,B1,B2

A1,A2,B1,B2

MINUTES LEFT FOR START — This value is displayed only in the network display tables (using Service Tool, ComfortVIEW™ or ComfortWORKS® software) and represents the amount of time to elapse before the unit will start its initialization routine. This value can be zero without the machine running in many situations. This can include being unoccupied, ENABLE/OFF/REMOTE CONTACT switch in the OFF position, SCN not allowing unit to start, Demand Limit in effect, no call for cooling due to no load, and alarm or alert conditions present. If the machine should be running and none of the above are true, a minimum off time (DELY, see below) may be in effect. The machine should start normally once the time limit has expired.

MINUTES OFF TIME (DELY) [Configuration OPT2] — This user-configurable time period is used by the control to determine how long unit operation is delayed a fter power is applied/restored to the unit. Typically, this time pe riod is configured when multiple machines are located on a single site. For example, this gives the user the abilit y to prevent all the units from restarting at once after a power failure. A value of zero for this variable does not mean that the unit should be running.

LEAD/LAG DETERMINATION — This is a configurable choice and is factory set to be automatic for all units. The value can be changed to Circuit A or Circuit B leading as desired. Set at automatic, the control will sum the current number of logged circuit starts and one-quarter of the current operating hours for each circuit. The circuit with the lowest sum is started first. Changes to which circuit is the lead circuit and which is the lag are also made when total machine capacity is at 100% or when there is a change in the direction of capacity (increase or decrease) and each circuit’s capacity is equal.

CAP ACITY CONTROL OVERRIDES — The following overrides will modify the normal operation of the routine.

Deadband Multiplier

— The user configurable Deadband Multiplier (Z.GN) [Configuration, SLCT] has a default value of 1.0. The range is from 1.0 to 4.0. When set to other than 1.0, this factor is applied to the capacity Load/Unload Factor. The larger this value is set, the longer the control will delay between adding or removing stages of capacity. Figure 12 shows how compressor starts can be reduced over time if the leaving water temperature is allowed to drift a larger amount above and below the set point. This value should be set in the range of 3.0 to

4.0 for systems with small loop volumes. First Stage Override

— If the current capa city stage is zero, the control will modify the routine with a 1.2 fac tor on adding the first stage to reduce cycling. This factor is also applied when the control is attempting to remove the last stage of capacity.

Slow Change Override

— The control prevents the capacity stages from being changed when the leaving fluid temperature is close to the set point (within an adjustable deadband) and moving towards the set point.

Ramp Loading

(CRMP) [Configuration, SLCT] — Limits the rate of change of leaving fluid temperature. If the unit is in a Cooling mode and configured for Ramp Loading, the control makes 2 comparisons before deciding to change stages of capacity. The control calculates a temperature difference between the control point and leaving fluid temperature. If the difference is greater than 4 °F (2.2 °C) and the rate of change (°F or °C per minute) is more than the configured Cooling Ramp Loading value (CRMP), the control does not allow any changes to the current stage of capacity.

Low Entering Fluid Temperature Unloading

— When the entering fluid temperature is below the control point, the control will attempt to remove 25% of the current stages being used. If exactly 25% cannot be removed, the control removes an amount greater than 25% but no more than necessary. The lowest stage will not be removed.

Minimum Load Control

— If equipped, the minimum load control valve is energized only when one compressor in the circuit is running. If the close control feature is enabled the minimum load control valve may be used as needed to obtain leaving fluid temperature close to set point.

Cooler Freeze Protection

— The control will try to prevent shutting the chiller down on a Cooler Freeze Protection ala rm by removing stages of capacity. If the cooler fluid selected is Water, the freeze point is 34 F (1.1 C). If the cooler fluid selected is Brine, the freeze point is the Brine freeze Point (BR.FZ) [Set Points, FRZ]. This alarm condition (A207) only references leaving fluid temperature and NOT Brine Freeze point. If the cooler leaving fluid temperature i s less than the freeze point plus 2.0° F (1.1° C), the control will immediately remove one stage of capacity. This can be repeated once every 30 seconds.

Low Saturated Suction Protection

— The control will try to prevent shutting a circuit down due to low saturated suction conditions by removing stages of capacity. These circuit alert conditions (T116, T117) compare saturated suction temperature to the configured Brine Freeze point (BR.FZ) [Set Points, FRZ]. The Brine Freeze point is a user-configurable value that must be left at 34 F (1.1 C) for 100% wate r sys tems. A lower value may be entered for systems with brine solutions, but this value should be set according to the freeze protection level of the brine mixture. Failure to properly set this brine freeze point value may permanently damage the brazed plate heat exchanger. The control will initiate Mode 7 (Circuit A) or Mode 8 (Circuit B) to indicate a circuit’s capacity is limited and that eventually the circuit may shut down.

LEGEND

Leaving Water Temperature

LWT —

LWT (C)

MODIFIED DEADBAND

2 STARTS

3 STARTS

DEADBAND EXAMPLE

LWT (F)

0 200 400 600 800 1000

TIME (SECONDS)

STANDARD DEADBAND

Fig. 12 — Deadband Multiplier

Head Pressure Control —

The Main Base Board (MBB) controls the condenser fans to maintain the lowest condensing temperature possible, and thus the highest unit efficiency. The MBB uses the saturated condensing temperature input from the discharge pressure transducer to control the fans. Head pressure control is maintained through a calculated set point which is automatically adjusted based on actual

160

140

120

105

100

SCT (F)

47.5

-10 -5

LEGEND

SCT — SST —

Saturated Condensing Temperature Saturated Suction Temperature

R-22 SST (F)

25 30

149

35 40 45 50 55

154

Fig. 13 — Operating Envelope for

R-22 Maneurop Compressor

saturated condensing and saturated suction temperatures so that the compressor(s) is (are) always operating within the manufacturer's specified envelope (see Fig. 13). The control will automatically reduce the unit capacity as the saturated condensing temperature approaches an upper limit. The control will indicate through an alert that a high ambient unloading mode is in effect. If the saturated condensing temperature in a circuit exceeds the calculat ed maximum, the circuit will be stopped. For these reasons, there are no head pressure control methods or set points to enter. If the saturated condensing temperature in a circuit is greater than or e qual to 95 F (35 C) at start-up, all available condenser fans will be started to prevent excessive discharge pressure during pull-down. The control will turn off a fan stage when the condensing temperature has been below the calculated head pressure set point by 35 F (19.4 C) for more than 2 minutes. Fan sequences are shown in Fig. 14.

MOTORMASTER® V OPTION — For low-ambient operation, the lead fan on a circuit can be equipped with the Motormaster V head pressure controller option or accessory. The control will automatically raise the head pressure set point by 5 F (2.8 C) when Motormaster control is configured. The controller is energized with the first fan stage and adjusts fan speed to maintain a liquid pressure of 135 psig (931 kPa). For sizes 010-018 and Circuit B of sizes 032-040, the two-speed fan is wired for high speed operation and the Motormaster V controller adjusts fan speed. For size 022-030, 042-055 and circuit A of the 032-040 sizes, the lead fan (A1 or B1) in the circuit is controlled. Refer to Fig. 14 for condenser fan staging information. Refer to Fig. 15 for typical pressure transducer location.

FAN ARRANGEMENT FAN NO. FAN RELAY NORMAL CONTROL

30RAN010-018

CONTROL BOX END

30RAN022-030

CONTROL BOX END

30RAN032-040

CONTROL BOX END

30RAN042-055

CONTROL BOX END

1 2

3 4

1FC-LS

1FC-HS

1FC-A1

2FC-A2

1FC-A1

2FC-A2

3FC-LS

3FC-HS

1FC-A1

2FC-A2

3FC-B1

4FC-B2

Energize Fan at

Low Speed

Energize Fan at

High Speed

First Stage

Condenser Fan

Second Stage

Condenser Fan

On with Compressor A1

and/or Compressor A2

First Stage Condenser

Fan, Circuit A

Low Speed, Fan on

w/Compressor B1

Energize Fan at High Speed,

First Stage Condenser Fan,

Circuit B

On with Compressor A1

and/or Compressor A2

Circuit A

On with Compressor B1

and/or Compressor B2

Circuit B

Fig. 14 — 30RA Condenser Fan Sequence

DETAIL A

PRESSURE TRANSDUCER INSTALLED HERE

SEE DETAIL A

Fig. 15 — Typical Motormaster® V Controller and Pressure Transducer Location (Sizes 022-030 Shown)

Operation of Machine Based on Control Method and Cooling Set Point Selection Settings —

configuration of the control method (CTRL) [Configuration, OPT2] and cooling set point select (CLSP) [Configuration, SLCT] variables. All models are factory confi gured with cooling set point select set to 1 (single set point, CSP1). With the control method set to 0, simply switching the Enable/Off/Remote Contact switch to the Enable or Remote Contact position (external contacts closed) will put the chiller in an occupied state. The control mode [Operating Modes, MODE] will be 1 (OFF LOCAL) when the sw itch is Off an d wi ll be 5 (O N LOCAL) when in the Enable position or Remote Contact position with exte rn al cont ac ts clo se d.

Two other control methods are avai lable for Machine On/

Off control: OCCUPANCY SCHEDULE (CTRL=2) — The Main Base

Board will use the operating schedules as defined under the Time Clock mode in the Marquee display. These schedules are identical. The schedule number must be set to 1 for local schedule.

The schedule number can be set anywhere from 65 t o 99 for operation under a SCN global schedule. The Enable/Off/ Remote Contact must be in the Enable or Remote Contact position. The control mode [Operating Modes, MODE] will be 1 when the switch is Off. The control mode will be 3 when the Enable/Off/Remote Contact switch input is On and the time of day is during an unoccupied period. Similarly, the control mode will be 7 when the time of day is during an occupied period.

SCN SCHEDULE (CTRL=3) — An external SCN device such as Flotronic™ System Manager controls the On/Off state of the machine. This SCN device forces the variable ‘CHIL_S_S’ between Start/Stop to control the chiller. The control mode [Operating Modes, MODE] will be 1 when the switch is Off. The control mode will be 2 when the Enable/Off/ Remote Contact switch input is On and the CHIL_S_S variable is ‘Stop.’ Similarly, the control mode will be 6 when the CHIL_S_S variable is ‘Start.’

Machine On/Off control is determined by the

Table 8 illustrates how the control method and cooling set point select variables direct the operation of the chiller and the set point to which it controls. The illustration also shows the ON/OFF stat e of th e ma chi ne fo r t he gi ven co mbin at ions .

Cooling Set Point Select

SING LE — Unit operation is based on Cooling Set Point 1 (CSP1) [Set Point, COOL].

DUAL SWITCH — Unit operation is based on Cooling Set Point 1 (CSP1) [Set Po int, COOL] when the Dual Set Point switch contacts are open and Cooling Set Point 2 (CSP2) [Set Point, COOL] when they are closed.

DUAL SCN OCCUPIED — Unit operation is based on Cooling Set Point 1 (CSP1) [Set Point, COOL] during the Occupied mode and Cooling Set Point 2 (CSP2) [Set Point, COOL] during the Unoccupied mode as configured under the local occupancy schedule accessible only from SCN. Schedule Number in Table SCHEDOVR (See Appendix A) must be configured to 1. If the Schedule Number is set to 0, the unit will operate in a continuous 24-hr Occupied mode. Control method must be configured to 0 (switch). See Table 8.

4 TO 20 mA INPUT — Unit operation is based on an external 4 to 20 mA signal input to the Energy Management Module (EMM).

LOW SOUND MODE OPERATION — All models are factory configured with the Low Sound Mode disabled. In the Configuration mode under sub-mode OPT2, items for low sound mode select (LS.MD), low sound start time (LS.ST), low sound end time (LS.ND) and low sound capacity limit (LS.LT) are factory configured so that the chiller always runs as quietly as possible. This results in operation at increased saturated condensing temperature. As a result, some models may not be able to achieve rated efficiency. For chiller operation at rated efficiency, disable the low sound mode or adjust the low sound mode start and stop times accordingly or set both times to 00:00 for rated efficiency operation 24 hours per day. In addition, the low sound capacity limit can be used to reduce overall chiller capacity, if required, by limiting the maximum to a user-configured percentage.

Table 8 — Control Methods and Cooling Set Points

ENTER

CONTROL

TYPE

(CTRL)

0 (switch)

2 (Occupancy)

3 (SCN)

*Dual set point switch input used. CSP1 used when switch input is open. CSP2 used when switch input is closed.

†Cooling set point determined from 4 to 20 mA input to Energy Management Module (EMM) to terminals TB6-3,5.

OCCUPANCY

STATE

Occupied ON,CSP1 ON* ON,CSP1 ON† Unoccupied ON,CSP1 ON* ON,CSP2 ON Occupied ON,CSP1 ON* Illegal ON† Unoccupied OFF OFF Illegal OFF Occupied ON,CSP1 ON* ON,CSP1 ON† Unoccupied ON,CSP1 ON* ON,CSP2 ON†

(single)

HEATING OPERATION — The chiller can be used for pump outputs or optional factory-installed hydronic system operation can be utilized for heating applications. The heating mode is activated when the control sees a field-supplied closed switch input to terminal block TB5-7,8. The control locks out cooling when the heat relay input is seen. A field-supplied boiler relay connection is made using heat relay and alarm relay contacts. Factory-installed ‘BOILER’ connections exist in the control panel near TB5 for these applications. Alarms and alerts A189 through A202 are active during heating operation.

Marquee Display Usage (See Fig. 16 and Tables 8-27) —

user interface to the ComfortLink™ control system. The display has up and down arrow keys, an key, and an

ENTER

different levels of the display structure. See Table 9. Press the

ESCAPE top 11 mode levels indicated by LEDs on the left side of the display .

will scroll a clear language text description across the display indicating the full meaning of each display acronym. Pressing the and keys when the display is bl ank (Mode LED level) will return the Marquee display to its default menu of rotating display items. In addition, the password will be disabled requiring that it be entered again before changes can be made to password protected items.

Portuguese can be displayed when properly configuring the LANG Item in the Configuration Mode, under the Display (DISP) submode. See Table 17. Throughout this text, the location of items in the menu structure will be described in the following format:

Item Expansion (ITEM) [Mode Name, Sub-mode Name] For example, using the language selection item: Language Selection (LANG) [Configuration, DISP]

key. These keys are used to navigate through the

key until the display is blank to move through the

Pressing the a nd keys simultaneously

ESCAPE ENTER

Clear language descriptions in English, Spanish, French, or

The Marquee display module provides the

ESCAPE

ESCAPE ENTER

COOLING SET POINT SELECT (CLSP)

(dual, switch)

(dual, occ)

NOTE: When the LANG variable is c hanged to 1, 2, or 3, all appropriate display expansions will immediately change to the new language. No power-off or control reset is required when reconfiguring languages.

When a specific item is located, the display will flash showing the operator, the item, followed by the item value and then followed by the item units (if any). Press the key to stop the display at the item value. Items in the Configuration and Service Test modes are password protected. The display will flash PASS and WORD when required. Use the and arrow keys to enter the 4 digits of the password. The default password is 1111.

Changing item values or testing outputs is accomplished in the same manner. Locate and display the desired item. Press

to stop the display at the item value. Press the key again so that the item value flashes. Use the

arrow keys to change the value or state of an item and press the

key to accept it. Press the key and the item, value, or units display will resume. Repeat the process as required for other items.

See Tabl es 8-27 for further details.

Service Test (See Table 11) —

and control cir cuit power must be on.

The Service Test function should be used to verify proper operation of condenser fan(s), compressors, minimum load valve solenoid (if installed), cooler pump(s) and remote alarm relay. To use t he Service Test mode, the Enable/Off/Remote Contact switch must be in the OFF position. Use the display keys and Table 11 to enter the mode and display TEST. Press

twice so that OFF flashes. Enter the password if required. Use either arrow key to change the TEST value to the ON position and press . Press and the button to enter the OUTS or COMP sub-mode.

T est the condenser fans, cooler pump(s) and alarm relay by

changing the item values from OFF to ON. These discrete

ENTER ESCAPE

outputs are then turned off if there is no keypad activity for 10 minutes. Test the compressor and minimum load valve solenoid (if installed) outputs in a similar manner. The

MODE

Run Status

Service Test

Temperature

Pressures

Setpoints

Inputs

Outputs

Configuration

Time Clock

Operating Modes

Alarms

Alarm Status

ESCAPE

ENTER

minimum load valve solenoids will be turned off if there is no keypad activity for 10 minutes. Compressors will stay on until they are turned off by the operator. The Service Test mode will remain enabled for as long as there is one or more compressors running. All safeties are monitored during this test and will turn a compressor, circuit or the machine off if required. Any other mode or sub-mode can be accessed, viewed, or changed during the TEST mode. The STAT item [Run/Status, VIEW] will display “0” as long as the Service mode is enabled. The TEST sub-mode value must be changed back to OFF before the chill-

Fig. 16 — Scrolling Marquee Display

er can be switched to Enable or Remote contact for normal operation.

(4 to 20 mA)

ENTER

ESCAPE

Both main power

Optional Factory-Installed Hydronic Package —

If the chiller has factory-installed chilled fluid pumps, specific steps should be followed for proper operation.

The pump(s) in the hydronic package come factory pre-wired into the main unit power supply/starter. In order to check proper pump rotation, use the Service Test function to test the condenser fans and observe them for proper rotation (counter clockwise when viewed from the top). If fans turn correctly, the pumps will rotate corr ectly. Clockwise rotation of the pump motor cooling fans can also be used to determine that pumps are rotating correctly.

Operation of pump in wrong direction, even for a few seconds, can cause irreversible damage t o pump impeller and housing. Always verify correct wiring/pump rotation before operation.

Use Service T est function to test operation of pumps. Verify that the flow switch input is made when the pump is running. For dual pump hydronic systems, the control only uses one pump at a time. Consult the Installation Instructions supplied with this chiller and use the circuit setter balancing valve installed in hydronic package to adjust fluid flow rate.

Cooler Pump Control —

chines equipped with a factory installed pump package are configured with the Cooler Pump Control (CPC) [Configuration, OPT1] ON.

Machines not equipped with a pump package are configured with the cooler pump control OFF. It is recommended that the machine control the chilled water pump. If not, a 5-minute time delay is required after the command to shut the machine down is sent before the chilled water pump is turned off. This is required to maintain water flow during the shutdown period of the machine.

With or without this option enabled, the cooler pump relay will be energized when the mac hine enters an ON status (i.e., On Local, On SCN, On Time). An A207 - Cooler Freeze Protection Alarm, will energize the cooler pump relay also, as an override. The cooler pump relay will remain energized if the machine is in MODE 10 – Minimum Off Time.

Cooler Pump Sequence of Operation —

time the unit is in an ON status, as defined by the one of the following conditions, the cooler pump relay will be enabled.

1. The Enable-Off-Remote Switch in ENABLE, (CTRL=0).

2. Enable-Off-Remote Switch in REMOTE with a Start-Stop remote contact closure, (CTRL=0).

3. An Occupied Time Period from an Occupancy Schedule in combination with items 1 or 2, (CTRL=2).

4. A SCN Start-Stop Command to Start in combination with items 1 or 2, (CTRL=3).

As stated before, there are certain alarm conditions and Operating Modes that will turn the cooler pump relay ON. This sequence will describe the normal operation of the pump control algorithm.

When the unit cycles from an “On” state to an “ Off” state, the cooler pump output will remain energized for the Cooler Pump Shutdown Delay (PM.DY) [Configuration, OPT1]. This is configurable from 0 to 10 minutes. The factory default is 1 minute. If the pump output was deenergized during the transition period, the pump output will not be energized.

NO INTEGRAL PUMP — SINGLE EXTERNAL PUMP CONTROL — With a single external pump, the following options must be configured:

• Cooler Pump Control (CPC) [Configuration, OPT1]

OFF.

The 30RA AquaSnap® ma-

At any-

• Cooler Pump 1 Enable (PM1E) [Configuration, UNIT] NO.

• Cooler Pump 2 Enable (PM2E) [Configuration, UNIT] NO.

The maximum load allowed for the Chilled Water Pump

Starter is 5 VA sealed, 10 VA inrush at 24 volts. The starter coil is powered from the chiller control system. The starter s hould be wired between TB5-11 and TB5-13. If equipped, the fieldinstalled chilled water pump starter auxiliary contacts should be connected in series with the chilled water flow switch.

The Cooler Pump Relay will be energized when the

machine is “On.” The chilled water pump interlock circuit consists of a chilled water flow switch and a field-installed chilled water pump interlock. If the chilled water pump interlock circuit does not close within five (5) minutes of starting, an A200 — Cooler Flow/Interlock failed to close at Start-Up alarm will be generated and chiller will not be allowed to start.

If the chilled water pump in terlock or chilled water flow

switch opens for at least three (3) seconds after initially being closed, an A201 — Cooler Flow/Interlock Contacts Opened During Normal Operation Alarm will be generated and the machine will stop.

NO INTEGRAL PUMP — DUAL EXTERNAL PUMP CONTROL — With two external pumps, the following options must be configured:

• Cooler Pump Control (CPC) [Configuration, OPT1] ON.

• Cooler Pump 1 Enable (PM1E) [Configuration, UNIT] YES.

• Cooler Pump 2 Enable (PM2E) [Configuration, UNIT] YES.

The maximum load allowed for the Chilled Water Pump

Starters is 5 VA sealed, 10 VA inrush at 24 volts. The st arter coil is powered from the chiller control system. The starter for Chilled Water Pump 1 should be wired between TB5-11 and TB5-13. The starter for Chilled W ater Pump 2 shoul d be wired between TB5-15 and TB5-13. A field-installed chille d water pump interlock for each pump must be connected to each pump’s interlock points on the Main Base Board. The Chilled Water Pump 1 Interlock, CWP1, must be connected to MBBJ7-1 and –2. The Chilled W ater Pump 2 Interlock, CWP2, must be connected to MBB-J7-3 and –4. The chilled water pump interlock contacts should be rated for dry circuit application capable of handling 5 vdc at 2 mA.

SINGLE INTEGRAL PUMP CONTROL — With a single pump, the following options must be configured:

• Cooler Pump Control (CPC) [Configuration, OPT1] ON.

• Cooler Pump 1 Enable (PM1E) [Configuration, UNIT] YES.

• Cooler Pump 2 Enable (PM2E) [Configuration, UNIT] NO.

With a single integral pump, the Cooler Pump Starter will

be energized when the machine is occupied. As part of the factory-installed package, an auxiliary set of contacts is wired to the MBB to se rve as Chilled Water Pump Interlock. W hen the mechanical cooling is called for, the pump interlock and flow switch is checked. If the circuits are c losed, the machine starts its capacity routine. If the auxiliary contact interlock does not close within 25 seconds of the ON command, a T190 — Cooler Pump 1 Aux Contacts Failed to Close at Start-Up Alert will be generated and the pump shut down. The unit will not be allowed to start. If the chilled water flow switch does not close within one (1) minute, two alarms will be generated. A T192 — Cooler Pump 1 Failed to Provide Flow at Start-Up Alert and an A200 – Cooler Flow/Interlock failed to close at Start-Up will be generated and chiller will not be allowed to start.

If the chilled water flow switch opens for at least 3 seconds

after initially being closed, a T196 — Flow Lost While Pump 1 Running Alert and an A201 — Cooler Flow/Interlock Contacts

Opened During Normal Operation Alarm will be generated and the machine will stop.

If the control detects the chilled water pump interlock open for 25 seconds after initially being closed, a T194 — Cooler Pump 1 Contacts Opened Duri ng Normal Operation Alert is generated and the unit is shut down.

If the control detects the chilled water flow switch circuit closed for at least 5 minutes with the pump output OFF, an A202 — Cooler Pump Interlock Closed When Pump is Off Alarm will be generated and the unit will not be allowed to start.

If the control detects that the chilled water pump auxiliary contacts are closed for at least 25 seconds while the pump is OFF, a T198 — Cooler Pump 1 Aux Contacts Closed While Pump Off A l e r t i s generated. The ch il le r will not be allowe d to start.

If the control starts a pump and the wrong interlock circuit closes for at least 20 seconds, an A189 — Cooler Pump and Aux Contact Input Miswire Alarm will be generated. The unit will be prevented from starting.

As part of a pump maintenance routine, the pump can be started to maintain lubrication of the pump seal. To utilize this function, Cooler Pmp Periodic Start (PM.P.S) [Configuration, UNIT] must be se t to YES. This option i s se t to N O a s th e f a ctory default. With this feature enabled, if the pump is not operating, it will be started and operated for 2 seconds starting at 14:00 hours. If the pump is operating, this routine is skipped. If the pump has failed and an Alarm/Alert condition is active, the pump will not start that day.

DUAL INTEGRAL PUMP CONTROL — With a dual integral pump package, the following options must be configured:

• Cooler Pump Control (CPC) [Configuration, OPT1] ON.

• Cooler Pump 1 Enable (PM1E) [Configuration, UNIT]

YES

• Cooler Pump 2 Enable (PM2E) [Configuration, UNIT]

YES

Pump Start Selection is a field-configurable choice. Cooler Pump Select (PM.SL) [Configuration, UNIT] is factory defaulted to 0 (Automatic). This value can be changed to 1 (Pump 1 Starts First) or 2 (Pump 2 Starts First). If PM.SL is 0 (Automatic), the pump selection is based on two cri teria: the alert status of a pump and the operational hours on the pump. If a pump has an active Alert condition, it will not be considered for the lead pump. The pump with the lowest operational hours will be the lead pump. A pump is selected by the control to start and continues to be the lead pump until the Pump Changeover Hours (PM.DT) [Configuration, UNIT] is reached. The Lead Pump (LD.PM) [Run Status, VIEW] indicates the pump that has been selected as the lead pump: 1 (Pump 1), 2 (Pump 2), 3 (No Pump). The Pump Changeover Hours is factory defaulted to 500 hours. Regardless of the Cooler Pump Selection, any pump that has an active alert will not be allowed to start.

With the dual integral pump package, the Cooler Pump Starter will be energized when the machine is in an occupied period. As part of the factory-installed package, an au xiliary set of contacts is wired to the MBB to serve as Chilled Water Pump Interlock, one set for each pump to individual channels on the MBB. With a call for mechanical cooling, the specific pump interlock and flow switch are checked. If the circuits are closed, the machine starts its capacity routine. If Pump 1 starts and the auxiliary contact interlock does not close within 25 seconds of the ON command, a T190 – Cooler Pump 1 Aux Contacts Failed to Close at Start-Up Alert will be generated and the pump shut down. The unit will not be allowed to start. If the chilled water flow switch does not close with in 1 minute, two alarms will be generated. A T192 – Cooler Pump 1 Failed to Provide Flow at Start-Up Alert and an A200 – Cooler Flow/ Interlock failed to close at Start-Up will be generated and chiller

will not be allowed to start. In either fault ca se listed above, Pump 2 will be commanded to start once Pump 1 has fail ed.

If Pump 2 starts and the auxiliary contact interlock does not close within 25 seconds of the ON command, a T191 — Cooler Pump 2 Aux Contacts Failed to Close at Start-Up Alert will be generated and the pump shut down. The unit will not be allowed to start. If the chilled water flow switch does not close within one (1) minute, two alarms will be genera ted. A T193 — Cooler Pump 2 Failed to Provide Flow at Start-Up Alert and an A200 – Cooler Flow/Interlock failed to close at Start-Up will be generated and chiller will not be allowed to start. In either fault case listed above, Pump 1 will be commanded to start once Pump 2 has failed.

If the chilled water flow switch opens for at least 3 seconds after initially being closed, a T196 — Flow Lost While Pump 1 Running Alert or T197 — Flow Lost While Pump 2 Running Alert for the appropriate pump and an A201 — Cooler Flow/ Interlock Contacts Opened During Normal Operation Alarm will be generated and the machine will stop. If ava ilable, the other pump will be started. If flow is proven, the machine will be allowed to restart.

If the chilled water pump interlock opens for 25 seconds after initially being closed is detected by the control, the appropriate T194 – Cooler Pump 1 Contacts Opened During Normal Operation Alert or T195 – Cooler Pump 2 Contacts Opened During Normal Operation Alert is generated and the unit is shut down. If available, the other pump will be started. If flow is proven, the machine will be allowed to restart.

If the control detects that the chilled water flow switch circuit is closed for at least 5 minutes wi th the pump output OFF, an A202 – Cooler Pump Interlock Closed When Pump is Off Alarm will be generated and the unit will not be allowed to start.

If the control detects that the chilled water pump auxiliary contacts are closed for at least 25 seconds while the pump is OFF, the appropriate T198 – Cooler Pump 1 Aux Contacts Closed While Pump Off or Alert T199 – Cooler Pump 2 Aux Contacts Closed While Pump Off Alert is generated. The chiller will not b e al lowe d to st art .

If the control starts a pump and the wrong inte rlock circuit closes for at least 20 seconds, an A189 – Cooler Pump and Aux Contact Input Miswire Alarm will be generated. The unit will be prevented from starting.

The control will allow for pump changeover. Tw o methods will change the pump sequence. Before the changeover can occur, the unit must be at Capacity Stage 0. During changeover the chilled water flow switch input is ignored for 10 seconds to avoid a nuisance alarm.

With Cooler Pump Select (PM.SL) [Configuration, UNIT] set to 0 (Automatic) and when the differential time limit Pump Changeover Hours (PM.DT) [Configurat ion, UNIT] is reache d, the lead pump will be turned OF F. Approximately one (1) second later, the lag pump will start. Manual changeover can be accomplished by changing Rotate Cooler Pump Now (ROT.P) [Configuration, UNIT] to YES only if the machine is at Capacity Stage 0 and the differential time limit Pump Changeover Hours (PM.DT) [Configuration, UNIT] is reached. If the PM.DT is not satisfied, the changeover will not occur. With the machine at Capacity Stage 0, the pumps would rotate automatically as part of the normal routine.

With Cooler Pump Select (PM.SL) [Configuration, UNIT] set to 1 (Pump 1 Starts First) or 2 (Pump 2 Starts First), a manual changeover can be accomplished by changing PM.SL only. The machine Rem ote-Off-Enable S witch must be in the OFF pos ition to change this variable. The Rotate Cooler Pump Now (ROT.P) [Configuration, UNIT] feature does not work for these configuration options.

As part of a pump maintenance routine, the pumps can be

*Depending on piping sizes, use either:

• HH79NZ014 sensor/10HB50106801 well (3-in. sensor/well)

• HH79NZ029 sensor/10HB50106802 well (4-in. sensor/well)

Fig. 17 — Dual Chiller Thermistor Location

started to maintain lubrication to the pump seal. To utilize this function, Cooler Pmp Periodic Start (PM.P.S) [Configuration, UNIT] must be se t to YES. This option i s se t to N O a s th e f a ctory default. If feature is enabled and the pump(s) are not operating, then the pumps will be operated every other day for 2 seconds starting at 14:00 hours. If a pump has failed and has an active Alert condition, it will not be started that day .

Configuring and Operating Dual Chiller Control —

two units supplying chilled fluid on a common loop. This control algorithm is designed for parallel fluid flow arrangement only. One chiller must be configured as the master chiller, the other as the slave. An additional leaving fluid temperature thermistor (Dual Chiller LWT) must be installed as shown in Fig. 17 and connected to the master chiller. Refer to Sensors section, page 4, for wiring. The SCN communication bus must be connected between the two chillers. Connections can be made to the SCN screw terminals on TB3. Refer to Sterlco Comfort Network Interface section, page 3, for wiring inf ormation.

example the master chiller will be confi gured at address 1 and the slave chiller at address 2. The master and slave chillers must reside on the same SCN bus (SCNB) but cannot have the same SCN address (SCNA) [Configuration, OPT2]. Both master and slave chillers must have Lead/Lag Chiller Enable (LLEN) [Configuration, RSET] configured to ENBL. Master/ Slave Select (MSSL) [Configuration, RSET] must be configured to MAST for the mast er chiller and SLVE for the slave. Also in this example, the m aster chiller will be configured t o use Lead/Lag Balance Select (LLBL ) and Lead/Lag Balance Delta (LLBD) [Configuration, RSET] to even out the chiller run-times weekly. The Lag Start Delay (LLDY) [Configuration, RSET] feature will be set to 10 minutes. This will prevent the lag chil ler from starting u ntil the lead ch iller has been at 100% capacity for the length of the delay time. Parallel configuration (PARA) [Configuration, RSET] can only be configured to YES. The variables LLBL, LLBD and LLDY are not used by the slave chiller.

SUB-MODE

Ckt — Circuit

*Throughout this text, the location of items in the menu structure will be

described in the following format: Item Expansion (ITEM) [Mode Name, Sub-mode Name]

The dual chiller routine is available for the control of

Refer to Table 21 for dual chiller configuration. In this

Table 9 — Marquee Display Menu Structure*

MODE

LEGEND

RUN

STATUS

Auto Display (VIEW)

Machine

Hours/Starts

(RUN)

Compressor

Run Hours

(HOUR)

Compressor

Starts

(STRT)

Pump Maint.

(PM)

Software

Ver si on (VERS)

SERVICE

TEST

Manual

Mode

On/Off

(TEST)

Unit Outputs (OUTS)

Ckt A Comp

Tests

(CMPA)

Ckt B Comp

Tests

(CMPB)

TEMPERATURES PRESSURES

Unit

Temperatures

(UNIT)

Ckt A

Temperatures

(CIR.A)

Ckt B

Temperatures

(CIR.B)

Ckt A

Pressures

(PRC.A)

Ckt B

Pressures

(PRC.B)

SET

POINTS

Cooling (COOL)

Head

Pressure

(HEAD)

Brine

Freeze-

point

(FRZ)

Dual chiller start/stop control is determined by configuration of Control Method (CTRL) [Configuration, OPT2] of the Master chiller. The Slave chiller should always be configured for CTRL=0, Switch. If the chillers are to be controlled by Remote Contacts, both Master and Slave chillers should be enabled together. Two separate relays or one relay with two sets of contacts may control the chiller s. The Enable/Off/ Remote Contact switch should be in the Remote Contact position on both the Master and Slave chillers. The Enable/Off/ Remote Contact switch should be in the Enable position for CTRL=2, Occupancy or CTRL=3, SCN Control.

Both chillers will stop if the Master chiller Enable/Off/ Remote Contact switch is in the Off position. If the Emergency Stop switch is turned off or an alarm is generated on the Master chiller the Slave chiller will opera te in a Stand-Alone mode. If the Emergency Stop switch is turned off or an alarm is generated on the Slave chille r th e M a ste r c h il ler will operate in a Stand-Alone mode.

The master chiller controls the sla ve chiller by changi ng its Control Mode (STAT) [Run Status, VIEW] and its operating setpoint or Control Point (CTPT) [Run Status, VIEW].

THERMISTOR WIRING*

MODES

Modes

(MODE)

LEAVING FLUID

ALARMS

Current (CRNT)

Alarms

(RCRN)

History

Reset

Alarm

(HIST)

RETURN FLUID

INPUTS OUTPUTS CONFIGURATION

Unit

Discrete

(GEN.I)

Ckt A/B (CRCT)

Unit

Analog

(4-20)

For example, using the language selection item: Language Selection (LANG) [Configuration, DISP]

Unit

Discrete

(GEN.O)

Ckt A

(CIR.A)

Ckt B

(CIR.B)

MASTER

CHILLER

SLAVE

CHILLER

Display

(DISP)

Machine

(UNIT)

Options 1

(OPT1)

Options 2

(OPT2)

Temperature

Reset

(RSET)

Set Point

Select

(SLCT) Service

Configuration

(SERV)

Broadcast

Configuration

(BCST)

INSTALL DUAL CHILLER LWT LEAVING FLUID TEMPERATURE THERMISTOR (T10) HERE

TIME

CLOCK

Unit Time

(TIME)

Unit Date

(DATE)

Daylight

Saving

Time

(DST)

Schedule

Number

(SCH.N)

Local

Schedule

(SCH.L)

Schedule

Override

(OVR)

OPERATING

Table 10 — Run Status Mode and Sub-Mode Directory

SUB-MODE

VIEW EWT

KEYPAD

ENTRY

ENTER

ITEM DISPLAY SUB-ITEM DISPLAY SUB-ITEM DISPLAY

XXX.X °F

LWT

XXX.X °F

SETP

XXX.X °F

CTPT

XXX.X °F

ENTERING FLUID TEMP

ITEM

EXPANSION

LEAVING FLUID TEMP

ACTIVE SETPOINT

CONTROL POINT

COMMENT

LOD.F XXX LOAD/UNLOAD FACTOR

STAT X CONTROL MODE 0 = Service Test

1 = Off Local 2 = Off SCN 3 = Off Time 4 = Off Emrgcy 5 = On Local 6 = On SCN 7 = On Time 8 = Ht Enabled 9 = Pump Delay

LD.PM LEAD PUMP

OCC YES/NO OCCUPIED

LS.AC YES/NO LOW SOUND ACTIVE

MODE YES/NO OVERRIDE MODES IN EFFECT

CAP XXX % PERCENT TOTAL CAPACITY

STGE X REQUESTED STAGE

ALRM XXX CURRENT ALARMS & ALERTS

TIME XX.XX TIME OF DAY 00.00-23.59

MNTH XX MONTH OF YEAR 1 = January, 2 = February, etc.

DATE XX DAY OF MONTH 01-31

YEAR XX YEAR OF THE CENTURY

RUN HRS.U XXXX HRS MACHINE OPERATING HOURS

ENTER

STR.U XXXX MACHINE STARTS

HR.P1 XXXX.X PUMP 1 RUN HOURS

HR.P2 XXXX.X PUMP 2 RUN HOURS

HOUR HRS.A XXXX HRS CIRCUIT A RUN HOURS

ENTER

HRS.B XXXX HRS CIRCUIT B RUN HOURS See Note

HR.A1 XXXX HRS COMPRESSOR A1 RUN HOURS

HR.A2 XXXX HRS COMPRESSOR A2 RUN HOURS

HR.B1 XXXX HRS COMPRESSOR B1 RUN HOURS See Note

HR.B2 XXXX HRS COMPRESSOR B2 RUN HOURS See Note

STRT ST.A1 XXXX COMPRESSOR A1 STARTS

ENTER

ST.A2 XXXX COMPRESSOR A2 STARTS

ST.B1 XXXX COMPRESSOR B1 STARTS See Note

ST.B2 XXXX COMPRESSOR B2 STARTS See Note

PM PUMP PUMP MAINTENANCE

ENTER

SI.PM XXXX HRS PUMP SERVICE INTERVAL

P.1.DN XXXX HRS PUMP 1 SERVICE COUNTDOWN

P.2.DN XXXX HRS PUMP 2 SERVICE COUNTDOWN

P.1.MN YES/NO PUMP 1 MAINTENANCE DONE User Entry

P.2.MN YES/NO PUMP 2 MAINTENANCE DONE User Entry

NOTE: If the unit has a single circuit, the Circuit B items will not appear in the display, except the ability to configure circuit B will be displayed.

Table 10 — Run Status Mode and Sub-Mode Directory (cont)

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY SUB-ITEM DISPLAY SUB-ITEM DISPLAY

ITEM

EXPANSION

PM (cont) PMDT PUMP MAINTENANCE DATES

ENTER

P.1.M0 MM/DD/YY HH:MM

P.1.M1 MM/DD/YY HH:MM

P.1.M2 MM/DD/YY HH:MM

P.1.M3 MM/DD/YY HH:MM

P.1.M4 MM/DD/YY HH:MM

P.2.M0 MM/DD/YY HH:MM

P.2.M1 MM/DD/YY HH:MM

P.2.M2 MM/DD/YY HH:MM

P.2.M3 MM/DD/YY HH:MM

P.2.M4 MM/DD/YY HH:MM

ENTER

STRN STRAINER MAINTENANCE

ENTER

SI.ST XXXX HRS STRAINER SRVC INTERVAL

S.T.DN XXXX HRS STRAINER SRVC COUNTDOWN

S.T.MN YES/NO STRAINER MAINT. DONE User Entry

ST.DT STRAINER MAINT. DATES

ENTER

S.T.M0 MM/DD/YY HH:MM

COMMENT

S.T.M1 MM/DD/YY HH:MM

S.T.M2 MM/DD/YY HH:MM

S.T.M3 MM/DD/YY HH:MM

S.T.M4 MM/DD/YY HH:MM

ENTER

COIL COIL MAINTENANCE

ENTER

SI.CL XXXX HRS COIL SRVC INTER

C.L.DN XXXX HRS COIL SERVICE COUNTDOWN

C.L.MN YES/NO COIL MAINT. DONE User Entry

CL.DT COIL MAINTENANCE DATES

ENTER

C.L.M0 MM/DD/YY HH:MM

C.L.M1 MM/DD/YY HH:MM

C.L.M2 MM/DD/YY HH:MM

C.L.M3 MM/DD/YY HH:MM

C.L.M4 MM/DD/YY HH:MM

VERS MBB CESR-131279-xx-xx xx-xx is Version number*

ENTER

MARQ CESR-131171-xx-xx xx-xx is Version number*

EMM CESR-131174-xx-xx xx-xx is Version number*

NAVI CESR-131227-xx-xx xx-xx is Version number*

*Press and simultaneously to obtain version number.

ENTER ESCAPE

Table 11 — Service Test Mode and Sub-Mode Directory

SUB-MODE

TEST ON/OFF SERVICE TEST MODE To Enable Service Test Mode,

KEYPAD

ENTRY

ENTER

ITEM DISPLAY

ITEM

EXPANSION

COMMENT

move Enable/Off/Remote Contact switch to OFF. Change TEST to ON. Move switch to ENABLE.

OUTS OUTPUTS AND PUMPS

ENTER

FAN1 ON/OFF FAN 1 RELAY

FAN2 ON/OFF FAN 2 RELAY

CLP.1 ON/OFF COOLER PUMP 1 RELAY

CLP.2 ON/OFF COOLER PUMP 2 RELAY

CL.HT ON/OFF COOLER/PUMP HEATER

RMT.A ON/OFF REMOTE ALARM RELAY

CMPA CIRCUIT A COMPRESSOR TEST

ENTER

CC.A1 ON/OFF COMPRESSOR A1 RELAY

CC.A2 ON/OFF COMPRESSOR A2 RELAY

MLV ON/OFF MINIMUM LOAD VALVE RELAY

CMPB CIRCUIT B COMPRESSOR TEST See Note

ENTER

CC.B1 ON/OFF COMPRESSOR B1 RELAY

CC.B2 ON/OFF COMPRESSOR B2 RELAY

MLV ON/OFF MINIMUM LOAD VALVE RELAY

NOTE: If the unit has a single circuit, the Circuit B items will not appear in the display, except the ability to configure circuit B will be displayed.

Table 12 — Temperature Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

UNIT ENT AND LEAVE UNIT TEMPS

ENTER

CEWT

CLWT

OAT

SPT

DLWT

XXX.X °F

COOLER ENTERING FLUID

COOLER LEAVING FLUID

OUTSIDE AIR TEMPERATURE

LEAD/LAG LEAVING FLUID

CIR.A TEMPERATURES CIRCUIT A

ENTER

SCT.A

SST.A

RGT.A

XXX.X °F

SATURATED CONDENSING TMP

SATURATED SUCTION TEMP

COMPR RETURN GAS TEMP

SH.A XXX.X ^F SUCTION SUPERHEAT TEMP

CIR.B TEMPERATURES CIRCUIT B See Note

ENTER

SCT.B

SST.B

RGT.B

XXX.X °F

SATURATED CONDENSING TMP See Note

SATURATED SUCTION TEMP See Note

COMPR RETURN GAS TEMP See Note

SH.B XXX.X ^F SUCTION SUPERHEAT TEMP See Note

ITEM

EXPANSION

SPACE TEMPERATURE

COMMENT

NOTE: If the unit has a single circuit, the Circuit B items will not appear in the display, except the ability to configure circuit B will be displayed.

Table 13 — Pressure Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

PRC.A PRESSURES CIRCUIT A

ENTER

DP.A XXX.X PSIG DISCHARGE PRESSURE

SP.A XXX.X PSIG SUCTION PRESSURE

PRC.B PRESSURES CIRCUIT B See Note

ENTER

DP.B XXX.X PSIG DISCHARGE PRESSURE See Note

SP.B XXX.X PSIG SUCTION PRESSURE See Note

NOTE: If the unit has a single circuit, the Circuit B items will not appear in the display, except the ability to configure circuit B will be displayed.

ITEM

EXPANSION

Table 14 — Set Point and Sub-Mode Directory

COMMENT

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

ITEM

EXPANSION

COOL COOLING SETPOINTS

ENTER

CSP.1

CSP.2

CSP.3

XXX.X °F

COOLING SETPOINT 1 Default: 44 F

COOLING SETPOINT 2 Default: 44 F

ICE SETPOINT Default: 32 F

HEAD HEAD PRESSURE SETPOINTS

ENTER

HD.P.A

HD.P.B

XXX.X °F

CALCULATED HP SETPOINT A

CALCULATED HP SETPOINT B

FRZ BRINE FREEZE SETPOINT

ENTER

BR.FZ

XXX.X °F

BRINE FREEZE POINT Default: 34 F

Table 15 — Inputs Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

GEN.I GENERAL INPUTS

ENTER

STST STRT/STOP START/STOP SWITCH

FLOW ON/OFF COOLER FLOW SWITCH

PM.F.1 OPEN/CLSE COOLER PUMP 1 INTERLOCK

LD.PM X Lead Pump

PM.F.2 OPEN/CLSE COOLER PUMP 2 INTERLOCK

ITEM

EXPANSION

COMMENT

Default: 113 F

(Read Only)

Default: 113 F

(Read Only)

COMMENT

1 = Pump 1 2 = Pump 2 3 = No Pump

HT.RQ ON/OFF HEAT REQUEST

DLS1 ON/OFF DEMAND LIMIT SWITCH 1

DLS2 ON/OFF DEMAND LIMIT SWITCH 2

ICED ON/OFF ICE DONE

DUAL ON/OFF DUAL SETPOINT SWITCH

CRCT CIRCUITS INPUTS

ENTER

FKA1 ON/OFF COMPRESSOR A1 FEEDBACK

FKA2 ON/OFF COMPRESSOR A2 FEEDBACK

FKB1 ON/OFF COMPRESSOR B1 FEEDBACK See Note

FKB2 ON/OFF COMPRESSOR B2 FEEDBACK See Note

4-20 4-20 MA INPUTS

ENTER

DMND XX.X MA 4-20 MA DEMAND SIGNAL

RSET XX.X MA 4-20 MA RESET SIGNAL

CSP XX.X MA 4-20 MA COOLING SETPOINT

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