McQuay UV06 Installation Manual

Operation Maintenance Manual OM 752-2

MicroTech II® Unit Ventilator Controls

for AAF®-HermanNelson® Classroom Unit Ventilators

Group: Applied Systems

Part Number: 106506325

Date: April 2010

Electric Heat Only-

Software Model UV06

Used with AAF-HermanNelson Classroom Unit Ventilator

Model AVV - Floor Mounted

Model AHV - Ceiling Mounted

IMPORTANT

Before unit commissioning, please read this publication in its entirety.

Develop a thorough understanding before starting the commissioning procedure.

This manual is to be used by the commissioner as a guide. Each installation is unique, only general topics are covered.

The order in which topics are covered may not be those required for the actual commissioning.

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Acronyms/Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Display Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Menu Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Description of Operation . . . . . . . . . . . . . . . . . . . . 12

State Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

UVC Unit Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

OFF Mode (State 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Night Purge Mode (State 8) . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Fan Only Mode (State A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Emergency Heat Mode (Super State) . . . . . . . . . . . . . . . . . . . 16

Auto Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cool Mode (Super State) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

“CO2 Demand Controlled Ventilation (optional)” on page 33Special

Purpose Unit Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Unit Mode Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Occupancy Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Occupied Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Unoccupied Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Additional Occupancy Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Networked Occupancy Sensor Capability. . . . . . . . . . . . . . . . 23

Unit-Mounted Time-Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Unit-Mounted Tenant Override Switch . . . . . . . . . . . . . . . . . .24

Remote Wall-Mounted Sensor Tenant Override Switch . . . . . 24

Remote Wall-Mounted Sensor Status LED. . . . . . . . . . . . . . . 24

Space Temperature Set Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Networked Set Point Capability. . . . . . . . . . . . . . . . . . . . . . . . 25

Networked Set Point Offset Capability . . . . . . . . . . . . . . . . . .25

Networked Set Point Shift Capability . . . . . . . . . . . . . . . . . . . 25

Networked Space Temperature Sensor Capability . . . . . . . . . 25

Remote Wall-Mounted Sensor with +/–3°F

Adjustment (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Remote Wall-Mounted Sensor with 55°F to 85°F

Adjustment (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Effective Set Point Calculations . . . . . . . . . . . . . . . . . . . . . . .26

Proportional Integral (PI) Control Loops . . . . . . . . . . . . . . . . . . . . . 28

Discharge Air Temperature Control . . . . . . . . . . . . . . . . . . . . 28

PI Control Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Integral Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Indoor Air Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Auto Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Occupied, Standby, and Bypass Operation. . . . . . . . . . . . . . 30

Unoccupied Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Cycle Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Outdoor Air Damper Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Minimum Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Economizer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Networked Space Humidity Sensor Capability . . . . . . . . . . . 33

Networked Outdoor Humidity Sensor Capability . . . . . . . . . . 33

CO2 Demand Controlled Ventilation (optional) . . . . . . . . . . . 33

Networked Space CO2 Sensor Capability . . . . . . . . . . . . . . . 33

ASHRAE Cycle II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Outdoor Air Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Floating-Point Actuator Auto-Zero, Overdrive and Sync . . . . . . . . 34

External Binary Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

External Binary Input 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

External Binary Input 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

External Binary Input 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

External Binary Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

External Binary Output 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

External Binary Output 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

External Binary Output 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

UVC Input and Output Table . . . . . . . . . . . . . . . . . 38

Diagnostics and Service. . . . . . . . . . . . . . . . . . . . . 39

Alarm and Fault Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Space Temp Sensor Failure (). . . . . . . . . . . . . . . . . . . . . . 39

Outdoor Temp Sensor Failure () . . . . . . . . . . . . . . . . . . . . 40

Discharge Air Temp Sensor Failure () . . . . . . . . . . . . . . . . 40

Space Humidity Sensor Failure (optional) () . . . . . . . . . . . 40

Outdoor Humidity Sensor Failure (optional) () . . . . . . . . . . 40

Space CO2 Sensor Failure (optional) (). . . . . . . . . . . . . . . 40

Change Filter Indication () . . . . . . . . . . . . . . . . . . . . . . . . . 40

EPROM Memory Indicator () . . . . . . . . . . . . . . . . . . . . . . . 41

Configuration Display () . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Troubleshooting Temperature Sensors . . . . . . . . . . . . . . . . . . . . . 41

Troubleshooting Humidity Sensors . . . . . . . . . . . . . . . . . . . . . . . . 42

Troubleshooting Carbon Dioxide (CO2) Sensors . . . . . . . . . . . . . 42

UVC Configuration Parameters . . . . . . . . . . . . . . . 44

Introduction

This manual provides information on the MicroTech II® control system used in the AAF®-

HermanNelson

Unit Ventilator product line. It describes the MicroTech II components, input/

output configurations, field wiring options and requirements, and service procedures. For installation and general information on the MicroTech II Unit Ventilator Controller, refer

to IM 747, MicroTech II Unit Ventilator Controller. For installation, commissioning instructions, and general information on a particular unit

ventilator model, refer to the appropriate manual (Table 1), as well as accompanying software operating instruction manual (T able 4), and possible accessory manuals that may pertain to the unit (Table 3).

For installation and maintenance instructions on a plug-in communications card, refer to the appropriate protocol-specific installation and maintenance manual (Table 2). For a description of supported network variables for each protocol, refer to Protocol Data Packet bulletin ED

15065. Copies of the latest version of these manuals are available for download on our website at

www. mcquay.com or from your local McQuay Representative.

Table 1: Model-spe c ific unit ventilator installation literature

Description Manual #

Vertical IM 817 X X X X Horizontal IM 830 X X X X Vertical Self-Contained IM 789 X X X X X X

AHF

AHB

AHV

AHR

AVS

AVB

AVV

AVR

AZB

AZR

AZS

AZU

AZV

AZQ

Table 2: Protocol-specific communication card installation literature and protocol data

Description Manual #

Unit Ventilator Unit Controller LonWorks® Communications Module IM 729 Unit Ventilator Unit Controller JCI N2 Open® Communications Module IM 730 Unit Ventilator Unit Controller BACnet® Communications Module IM 731 Protocol Data Packet ED-15065

Table 3: Accessory-specific installation literature

Description Manual #

MTII Unit Ventilator Controls Installation IM 747 Room Temperature Sensors Installation IM 629 ATS Service Cable Installation for Unit Ventilators IM 762

McQuay OM 752 3

Introduction

Table 4: Software program literature

Description Manual #

Air Source Heat Pump with Electric Heat (Software Model 00) OM 748 Water Source Heat Pump with Electric Heat (Software Model 02) Water Source Heat Pump without Electric Heat (Software Model 03) DX Cooling with Electric Heat (Software Model 04) OM 750 DX Cooling Only (Software Model 05) OM 751 Electric Heat Only (Software Model 06) OM 752 DX Cooling with Hydronic Heat - Valve Control (Software Model 07) DX Cooling with Hydronic Heat - F&BP Damper Control (Software Model 08) 2-Pipe Hydronic Heat Only - Valve Control (Software Model 09) 2-Pipe Hydronic Heat Only - F&BP Damper Control (Software Model 10) 2-Pipe Chilled Water Cooling and Hot Water Heat - Valve Control (Software Model 11) 2-Pipe Chilled Water Cooling and Hot Water Heat - F&BP Damper Control (Software Model 12) 4-Pipe Chilled Water Cooling and Hydronic Heat - Valve Control (Software Model 13) 4-Pipe Chilled Water Cooling and Hydronic Heat - F&BP Damper Control (Software

Model 14) 2-Pipe Chilled Water Cooling Only - Valve Control (Software Model 15)

2-Pipe Chilled Water Cooling Only - F&BP Damper Control (Software Model 16) 2-Pipe Chilled Water Cooling with Electric Heat - Valve Control (Software Model 17)

2-Pipe Chilled Water Cooling with Electric Heat - F&BP Damper Control (Software Model 18)

OM 749

OM 753

OM 754

OM 755

OM 756

OM 757

OM 758

NOTICE

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this instruction manual, may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against detrimental interference when the equipment is operated in a commercial environment. Operation of this equipment in a residential area is likely to cause detrimental interference in which case users are required to correct the interference at their own expense. McQuay International disclaims any liability resulting from any

interference or for the correction thereof.

WARNING

Electric shock hazard. Can cause personal injury or equipment damage.

This equipment must be properly grounded. Connections and service to the MicroTech II control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.

CAUTION

Extreme temperature can damage system components.

The MicroTech II controller is designed to operate in ambient temperatures from -20°F to 125°F. It can be stored in ambient temperatures from -40°F to 140°F. It is designed to be stored and operated in relative humidity up to 95% (non-condensing).

CAUTION

Static sensitive components. A static discharge while handling electronic circuit boards can damage components.

Discharge any static electrical charge by touching the bare metal inside the main control panel before performing any service work. Never unplug any cables, circuit board terminal blocks, relay modules, or power plugs while power is applied to the panel.

4 McQuay OM 752

Introduction

Acronyms/Abbreviations

The following table list acronyms and abbreviations that may or may not be used within this manual. Other abbreviations for keypad displays and parameters can be found in Table 7 on page 10 and Table 25 on page 44.

Table 5: Acronyms and abbre v iations

Description

Air Fan AF Auxiliary Heat End Differential AHED Auxiliary Heat Start Differential AHSD American Standard Code for Information Interchange ASCII American Society of Heating, Refrigerating, and Air Conditioning Engineers, Inc Compressorized Cooling Lockout CCLO Spac e CO Chilled Water CW Chilled Water Valve Position CWVP Discharge Air DA Discharge Air High Limit DAHL Discharge Air Temperature DAT Discharge Air Temperature Setpoint DATS Demand Controlled Ventilation DX Cooling Discharge Air Low Limit DXLL Economizer Compare Differential ECD Economizer IA/OA Enthalpy Differential EED Economizer OA Enthalpy Setpoint EES Emergency Heat Setpoint EHS Exhaust Interlock OAD Min Position Setpoint EOAD Outdoor Air Temperature Setpoint EOAT End-of-Cycle EOC EOC OAT Low Setpoint EOCS Outdoor Air Humidity Output EORH Space Humidity Setpoint ERH Economizer IA/OA Temp Differential ETD Economizer OA Temp Setpoint ETS Source (water in) Temperature EWIT Face and Bypass Damper Position FBDP Federal Communications Commission FCC Face and Bypass F & BP Heating, Ventilating, Air Conditioning Refrigeration HVACR Heating EOC Valve Setpoint HEOC Hot Water HW Indoor Air IA Indoor Air Fan IAF Indoor Air Temperature IAT Light Emitting Diode LED Local User Interface LUI Mixed Air Low Limit MALL Mechanical Cooling Low Limit Setpoint MCLL National Electric Code NEC Outside Air OA Outside Air Dampers OAD Energize Exhaust Fan OAD Setpoint OADE OAD Min Position High-Speed Setpoint OADH OAD Min Position Low-Speed Setpoint OADL OAD Min Position Med-Speed Setpoint OADM Outdoor Air Damper Position OADP OAD Lockout Setpoint OALS OAD Max Position Setpoint OAMX Outside Air Temperature OAT

Setpoint CO2S

Acronym/

ASHRAE

DCV

Abr.

McQuay OM 752 5

Introduction

Description

Occupied Cooling Setpoint OCS Occupied Heating Setpoint OHS Occupancy Override Input OOI Occupancy Sensor Input OSI Proportional Integral PI Parts Per Million PPM Positive Temperature Coefficient PTC Relative Humidity RH Space Humidity Setpoint Read Only RO Read Write RW Standby Cooling Setpoint SCS Standby Heating Setpoint SHS Thermal Expansion Valve TXV Unoccupied Cooling Setpoint UCS Unoccupied Heating Setpoint UHS Unit Ventilator UV Unit Ventilator Controller UVC UVC (Heat/Cool) Mode Output UVCM UVC State Output UVCS Wet Heat Valve Position VALP Ventilation Cooling Low Limit Setpoint VCLL Ventilation Cooling Lockout VCLO Ventilation Cooling Setpoint VCS Wet Heat WH Source (water in) Temperature Differential WITD

Acronym/

RHS

Abr.

6 McQuay OM 752

Getting Started

The MicroTech II U nit Vent Controller (UVC) is a self-contained device that is capable of complete, stand-alone operation. Information in the controller can be displayed and modified by using the keypad/display (local user interface). The following sections describe how to use the keypad/display.

Note – Many UVC parameters are accessible both through the keypad/display and the network

interface. The shared keypad/display and the network interface variables have a “lastchange-wins” relationship.

Using the Keypad/Display

The keypad/display shown in Figure 1 is provided with all MicroTech II Applied Unit Ventilator unit controllers. With the keypad/display, operating conditions, system alarms, and control parameters can be monitored. Set points and other parameters also can be modified.

Figure 1: Keypad/display

MicroTechTMII

FAN ONLY

COOL

HEAT

AUTO

MODE FAN

HIGH

MED

LOW

AUTO

FUNC

ON /

STOP

Display Format

The keypad/display’s 2-digit, 7-segment display normally shows the effective heating or cooling temperature set point (Effective Set Point Output). The display also is used to view and modify UVC parameters as explained in the following sections.

Note – When the UVC is in the OFF mode, the effective heating set point appears in the display.

All other LEDs are switched off.

Keypad Functions

Security Levels

The keypad/display provides a 4-level password security feature that can be used to restrict access. The available security levels are shown in Table 6.

Note – All unit ventilator controllers ship with the lowest security (level 0) enabled. To change

security levels, see Figure 2. Once a security level is changed, the keypad/display remains at that security level until the next time it is changed.

Why can’t I use the MODE or FAN key or adjust Set Point Offset?

Most likely this is due to the security feature being used. If the security feature is set higher than level 0, then some keypad/display functionality is locked out. To ensure this is not the problem, enter the level 0 password then try to use the keypad/display again.

McQuay OM 752 7

Getting Started

Table 6: Keypad/display security levels

Level Display What is restricted? Password



Default level (access all) 10 Does not allow set point offset changes;



also locks out keypad/display menu access.

Does not allow set point offset changes nor MODE key changes; also locks out



keypad/display menu access. Does not allow set point offset changes



nor MODE and FAN key changes; also locks out keypad/display menu access.

Figure 2: Changing keypad/display security levels

ON/STOP Key and LED

Use the ON/STOP key to toggle the UVC between OFF mode and running (Application Mode Input). The ON/STOP LED is off when the UVC is in the OFF mode.

Note – When the UVC is in the OFF mode, the effective heating set point appears in the display.

All other LEDs are switched off.

– The UVC archives each change to the keypad/display FAN and MODE keys. When the

ON/STOP key is used to bring the unit out of OFF mode, the UVC implements the last active fan and unit modes.

– Each time the UVC power cycles, the UVC is in the auto fan and auto unit modes when

power is returned.

WARNING

Off mode is a “stop” state for the unit ventilator. It is not a “power off” state. Power may still be provided to the unit.

FAN Key

Use the F AN key to toggle through each of the fan speeds (Fan Speed Command Input): Auto, Low, Medium, and High.

MODE Key

Use the MODE key to toggle through the keypad/display accessible unit modes (Heat/Cool Mode Input): Auto, Heat, Cool, and Fan Only.

Arrow Keys

Use the arrow keys to scroll between parameters and to adjust parameters.

FUNC Key

Use the Func key to view the actual space temperature or to confirm selection and changes to user-adjustable parameters.

8 McQuay OM 752

Getting Started

Using the Keypad/Display

Viewing Actual Indoor Air Temperature (IAT)

Normally, the effective set point temperature appears on the keypad/display. You also can use the keypad/display to view the indoor air temperature (IAT). See Figure 3.

Note – When the actual indoor air temperature (Effective Space Temp Output) equals the

effective set point temperature (Effective Set Point Output), you there is no change to the keypad/display when you view space temperature.

Figure 3: Viewing indoor air temperature

70 71 70

Effective set point

Changing Set Points

The keypad/display can be used to make a +/–5°F (+/–3°C) offset adjustment to the effective temperature set point. See Figure 4. Also see “Space Temperature Set Points” on page 24 to learn more about temperature set points.

Figure 4: Adjusting the set point offset

FUNC

Enter

(5-sec)

Actual space temperature

Effective set point

-1

Flash value

FUNC

Enter

Current

offset

So 69

Effective set point

-1

Adjusted

offset

FUNC

Save

change

Set point

offset

Note – The set point offset clears whenever UVC power is cycled. When you change the set point

offset after a power cycle, or for the very first time, this cleared value shows as the highest allowed value (5°F/3°C) but is not an actual offset value.

– When using the +/–3°F (+/–1.7°C) remote wall sensor, any set point offset adjustment

made at the keypad/display causes the UVC to override and ignore the remote wall sensor set point adjustment knob. To use the remote wall sensor set point adjustment knob after you changed the set point offset on the keypad/display, clear the keypad/ display set point offset by cycling UVC power.

– When using the 55°F to 85°F remote wall sensor, the UVC ignores any LUI set point offset

adjustments.

Menu Reference

The keypad/display menu eases troubleshooting and simplifies UVC configuration. The user can access the most common parameters and system status values without a PC or network interface.

The keypad/display menu is accessed via an unmarked, hidden key. This hidden key is located approximately behind the letter “h” in the MicroTech II logo on the keypad/display face.

The keypad/display menu consists of two levels. The first level is the keypad/display Menu Item List containing alphanumeric characters representing each parameter. The second level is where the parameter’s value is viewed and adjusted if the parameter is adjustable. After 15seconds, an inactivity timer automatically causes the display to back out of the menu levels, returning to the effective set point display.

McQuay OM 752 9

Getting Started

Figure 5: Changing a keypad/display menu item

Table 7: Keypad/display menu item list

Display Keypad menu item list Abr. Description

Reset Alarm Input Enter 1 to clear alarms (clears all inactive alarms, except filter alarm). To enable



UVC (Heat/Cool) Mode



Output UVC State Output



Discharge Air Temp Set



point Output Discharge Air Temp



Output Ventilation Cooling Low



Limit set point Mechanical Cooling Low



Limit set point Slave Type Configuration Set slave type: 0 = Independent (slave uses own sensors), 1 = Dependent (slave



Effective Occupancy



Output Occupancy Override Input



Occupied Cooling set



point Standby Cooling Set



point Unoccupied Cooling Set



point Occupied Heating Set



point Standby Heating Set



point Unoccupied Heating Set



point Wall Sensor Type



Outside Air Damper



Position Output OAD Min Position High-



Speed Set point OAD Min Position MedSpeed Set point OADM



OAD Min Position LowSpeed Set point OADL



the alarm again, enter 0. Display current UVC mode. 1 = Heat, 3 = Cool, 4 = Night Purge, 6 = Off, 8 = Emerg.

UVCM

Heat, 9 = Fan Only Display current UVC state. 1 = EconMech, 2 = Mech, 3 = Econ, 4 = DA Heat, 5 = Heat, 6 = ActiveDehum, 7 = Full Heat, 8 = Night Purge, 9 = Off, 10 = Fan Only, 11

UVCS

= Heat Mode Cant Heat, 12 = CantCool, 13 = Emerg Heat Mode Cant Heat, 14 = Heat Mode Low Limit, 15 = Cool Mode Low Limit

DATS Display current DA temperature set point. RO x

DAT Display current DA temperature. RO x

VCLL Adjust economizer cooling DA temperature low limit. RW x

MCLL Adjust mechanical cooling DA temperature low limit. RW x

follows master). This feature requires a network over which the master and slave UVCs can communicate.

Display current occupancy. RO x

Set occupancy: 0 = occupied, 1 = unoccupied, 2 = bypass, 3 = standby. Adjusting this variable is intended only for troubleshooting. Once you are done, cycle unit power to clear this variable and return the UVC to normal operation.

OCS Adjust occupied cooling set point. RW x

SCS Adjust standby cooling set point. RW x

UCS Adjust unoccupied cooling set point. RW x

OHS Adjust occupied heating set point. RW x

SHS Adjust standby heating set point. RW x

UHS Adjust unoccupied heating set point. RW x

Set wall sensor type: 0 = +/–3F, 1 = 55°F to 85°F. RW x 0

OADP Display OA damper position. RO x

Adjust OA damper minimum position with IAF at high speed. (This variable is

OADH

factory set to 5% open when the unit is ordered with optional Adjust OA damper minimum position with IAF at medium speed. (This variable is not used when the optional damper minimum regardless of fan speed.) Adjust OA damper minimum position with IAF at low speed. (This variable is not used when the optional damper minimum regardless of fan speed.)

CO2 DCV is enabled. Only OADH is active as the OA

CO2 DCV.)

RW x

RO x

RW x 0

RW x

RW x 20%

RW x 25%

RW x 30%

Default



54°F

(12°C)

45°F

(7°C)



73.4°F (23°C)

77°F

(25°C)

82.4°F (28°C)

69.8°F (21°C)

66.2°F (19°C)

60.8°F (16°C)



10 McQuay OM 752

Display Keypad menu item list Abr. Description

Exhaust Interlock OAD



Min Position set point Energize Exhaust Fan



OAD Set point OAD Max Position Set



point

OAD Lockout Enable



OAD Lockout Set point OALS



Economizer Enable Set economizer status: 0 = disable, 1 = enable. RW x 1



Economizer OA Temp



Set point Economizer IA/OA Temp



Differential Economizer OA Enthalpy



Set point Economizer IA/OA



Enthalpy Differential

Space Humidity Output ERH Display room humidity (optional). 00 = No sensor connected. RO x



Outdoor Air Humidity



Output

Outdoor Air Temp Output EOAT Display OA temperature. RO x



Emergency Heat Enable Set emergency heat status: 0 = disable, 1 = enable. RW x 1



Emergency Heat Set



point Emergency Heat



Shutdown Configuration External BI-3



Configuration Fan Cycling



Configuration

Filter Alarm Enable Set filter alarm status: 0 = disable, 1 = enable. RW x 0



Reset Filter Alarm Input Enter 1 to clear filter alarm. RW x



Space Temp Sensor



Offset

Keypad/display



Temperature Units

1. RW = read and write capable, RO = read only.

2. If a menu value is greater than 2-digits (higher than 99), then

Adjust OA damper position above which the exhaust fan output will be energized.

EOAD

There is a fixed –5% differential associated with this set point. Adjust OA damper minimum position when the exhaust interlock input is

OADE

energized.

OAMX Adjust OA damper maximum position. RW x 99%

Set OA damper lockout feature status: 0 = disable, 1 = enable. (This variable is factory set to 1 when the unit is ordered as a recirc unit with no OAD.) Adjust OA temperature below which the OA damper closes if the OA damper lockout is enabled. (This variable is factory set to –99°C when the unit is ordered as a recirc unit with no OAD.)

Adjust economizer OA temperature set point. DO NOT lower this set point below

ETS

CCLO or you risk creating a deadband where no cooling occurs.

ETD Adjust economizer IA/OA temperature differential. RW x 1.8°F (1°C)

EES Adjust economizer OA enthalpy set point. RW x

EED Adjust economizer IA/OA enthalpy differential. RW x

EORH Display OA humidity (optional). 00 = No sensor connected. RO x

EHS Adjust emergency heat set point. RW x

Set emergency heat operation during shutdown, 0 = no emergency heat during shutdown: 1 = allow emergency heat during shutdown.

Set the function external binary Input 3: 0 = ventilation lockout, 1 = exhaust interlock.

Set space fan cycles (switches off) during occupied, bypass, and standby mode: 2 = continuous, 3 = cycling.

Adjust this setting to bias the UVC measured space temperature. RW x 0

Set keypad/display temperature units in English or SI. This set point also effects which unit types displayed over Metasys N2 and BACnet MS/TP networks using the appropriate optional communications modules.

will be displayed on the keypad/display.

Getting Started

RW x 99%

RW x 12%

RW x 0

RW x

RW x 0

RW x 2

Default

35.6°F (2°C)

68°F

(20°C)

25 Btu/lb

(58 kJ/kg)

1.3 Btu/lb (3 kJ/kg)

53.6°F (12°C)



RW x F

McQuay OM 752 11

Description of Operation

State Programming

The MicroTech II UVC takes advantage of “state” machine programming to define and control unit ventilator operation. “State” defines specific states or modes of operation for each process within the unit ventilator (e.g., heating, cooling, etc.) and contain the specific logic for each state. This eliminates some of the most common problems associated with control sequences such as the possibility of simultaneous heating and cooling, rapid cycling, etc.

State machine programming, and the unique nature of state diagrams, can be easily used to describe operation. It can simplify sequence verification during unit commissioning, as well as simplify troubleshooting. With the unique combination of state machine programming and the keypad/display’s ability to allow a technician to easily determine the active UVC state, troubleshooting the UVC can be very simple.

The state diagrams presented in the following sections consist of several “elements” including super states, states, conditional jumps (also called transitions) and transition points. Super states are used as a means to group two or more related states into a single control function such as cooling, or heating, etc. States are where all the actual work takes place, within each state the UVC enables PI-loops and other logic sequences required to control unit ventilator operation within that particular state, while other functions and PI-loops not needed durin g that state may be disabled. Conditional jumps, or transitions, are the logic paths used by the UVC to determine which state should be made active, these are the “questions” the UVC continually considers. The transition point is simply a point through which a number of conditional jumps meet. Think of it as a point where a number of questions must be considered from which the UVC then determines which path is followed and which state is then made active.

The UVC states and super states are used to define the “normal” unit modes, such as Off, Night Purge, Fan Only, Emergency Heat, Auto, Cool, and Heat. The UVC also supports several “special purpose” unit modes such as Purge, Pressurize, De-pressurize, and Shutdown, which can be forced via a network connection and override typical UVC operation.

Note – Not all states or modes are available for all UV configurations, and some states (such as

Active Dehum) are optional.

– In the state descriptions below the terms, saturated high and saturated low, indicate that

the heating or cooling function being described has reached 100% or 0%, respectively.

12 McQuay OM 752

Figure 6: Complete UVC—state diagram

EmergencyHeat

ModeSuperState

FullHeat

CantHeat

Heat

LowLimit

FanOnly

NightPurge

Off

HeatMode

SuperState

AutoMode

Econ

CantCool

DAHeat

LowLimit

CoolMode

SuperState

CantHeat

Description of Operation

UVC Unit Modes

The UVC provides several “normal” modes of unit operation. These include: Off, Night Purge, Fan Only, Cool, Emergency Heat, Auto, Heat, and Cool.

Normal UVC modes can contain a single state or several states depending upon the functionality required for each particular mode. Each UVC state is assigned a number, which can be very helpful when trying to understand which state is currently active within the UVC. To view the current UVC state number, use the keypad/display.

McQuay OM 752 13

Description of Operation

OFF

Table 8: UVC st a t e na mes and numbers

Normal UVC modes State names

OFF OFF 9 9 57

Night purge Night Purge 8 8 56

Fan only Fan Only 10 A 65

Emergency heat

Heat

Auto

Cool

Full Heat 7 7 55

Cant Heat 13 D 68

Heat 5 5 53 Cant Heat 11 B 66 Low Limit 14 E 69

EconMech 1 1 49

Mech 2 2 50

Econ 3 3 51

DA Heat 4 4 52 Cant Cool 12 C 67 Low Limit 15 F 70

Decimal ASCII Hex

State numbers

WARNING

Off mode is a “stop” state for the unit ventilator. It is not a “power off” state. Power may still be provided to the unit.

OFF Mode (State 9)

Off mode is provided so that the UVC can be forced into a powered OFF condition. OFF mode is a “stop” state for the unit ventilator; it is not a power off state. OFF mode consists of a single UVC state: OFF [9].

When OFF mode becomes active, the UVC stops all normal heating, cooling, and ventilatio n (OA damper is closed), and fan operation ends. The UVC continues to monitor space conditions, indicate faults, and provide network communications (if connected to a network) in the OFF mode while power is maintained to the unit.

While in OFF mode, the UVC does not maintain DA temperatures. If the space temperature drops below EHS while in the OFF mode, the UVC is forced into the Emergency Heat mode (see “Emergency Heat Mode (Super State)” on page 16).

The space lighting output continues to operate based upon the current occupancy mode.

Note – Special purpose unit modes such as Purge, Pressurize, and De-pressurize can force the

UVC to perform “special” functions during which the display appears to be in the OFF mode.

Figure 7: Off state diagram

UVC Mode

UVC Mode  OFF



Transition

point

14 McQuay OM 752

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