McQuay AHB Installation Manual

Installation Manual IM 747

MicroTech II™ Unit Ventilator Controls

for AAF®-HermanNelson® Classroom Unit Ventilators

Group: Unit Ventilator
Part Number: 106506201

Date: July 2002
Supercedes: New

Used with AAF-HermanNelson Models: Vertical Floor - AVS, AVV, AVB, and AVR

Self-Contained Vertical Floor - AZS, AZQ, AZU, AZV, AZR, AED, AEQ, ARQ, ERQ

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

©2002 McQuay Incorporated

Horizontal Ceiling - AHF, AHV, AHB, and AHR

IMPORTANT

Before beginning installation, please read this publication in its entirety.

Develop a thorough understanding before starting the installation procedure.

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

Table of Contents

Safety Information........................................................ 3

Warnings and Cautions ................................................ 3

Introduction .................................................................. 4

General Description................................................... 4-5

Component Data ........................................................... 5

Unit Ventilator Controller (UVC)............................. 5

Expansion Board (EXP) ............................................ 6

Local User Interface (LUI) ....................................... 6

Plug-in LonMark Space Comfort Controller (SCC)

Communication Module (optional)........................... 6

Plug-in BACnet MS/TP

Communication Module (optional)........................ 6-7

Plug-in Metasys N2 Open Communication Module ..

Face & Bypass Damper Actuator (optional)............. 9

Modulating Valve Actuator (optional) ................... 10

2-position End-of-Cycle (EOC) Valves (optional) . 10

2-position Motorized Water Valves (optional) ....... 10

Time Clock (option) ........................................... 11-13

Make Electrical Wiring Connections ......................... 14

Field Wiring Harness Locations................................. 14

Field Wiring Remote Mounted Temperature Sensor . 15

Remote Wall Mounted Temperature Sensors ............ 15

Locating Wall Sensors ............................................... 16

Installing Wall Sensors.......................................... 17-19

External Input Option Wiring .................................... 19

External Output Option Wiring ............................. 19-20

(optional) ................................................................... 7

Temperature Sensor .................................................. 7

Humidity Sensor (optional)....................................... 8

Carbon Dioxide (CO2) Sensor (optional) ................. 8

Outdoor Air Damper (OAD) Actuator...................... 9

Split-System Condensing Unit Signal Wiring ........... 21

Communication Module Wiring ................................ 21

UVC Input and Output Tables ..............................22-27

UVC Configuration Parameters ............................ 28-30

Page 2 of 32 IM 747

Safety Information

NOTICE

WARNING

!

CAUTION

!

WARNING

!

Follow all safety codes. Wear safety glasses and work
gloves. Have a fire extinguisher available. Follow all
warnings and cautions in these instructions and attached
to the unit. Consult applicable local building codes and
National Electrical Codes (NEC) for special requirements.

Electric shock hazard. Can cause personal injury, or death, 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.

Recognize safety information. When you see a safety
symbol on the unit or in these instructions, be alert to the
potential for personal injury or death. Understand the
meanings of the words DANGER, WARNING, and
CAUTION. DANGER identifies the most serious hazards
that will result in death or severe personal injury; WARNING
means the hazards can result in death or severe personal
injury; CAUTION identifies unsafe practices that can
result in personal injury or product and property damage.

Improper installation, adjustment, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may result in personal injury or property
damage. This product must be installed only by personnel
with the training, experience, skills, and applicable licensing
that makes him/her “a qualified professional HVACR
installer.”

! DANGER

DISCONNECT ALL ELECTRICAL
POWER BEFORE SERVICING UNIT
TO PREVENT INJURY OR DEATH
DUE TO ELECTRICAL SHOCK.

If the unit ventilator is to be used for temporary heating or cooling,
the unit must first be properly commissioned. Failure to comply
with this requirement will void the warranty.

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

CAUTION

!

For proper space control, and a more trouble free unit operation,
it is important that End-of-Cycle (EOC) valves be used in all face
& bypass damper equipped unit ventilators. An EOC valve is

required for the wet heat coil in any unit ventilator that
combines both a refrigerant coil and a wet heat coil. Use an
EOC valve on all wet heat coils to minimize the potential for
overheating.

CAUTION

!

For proper space control, and a more trouble free unit operation,
it is important that an occupancy control means be used such that
the unit is placed into unoccupied mode during regular low load
conditions such as nighttime, weekends and holidays.

CAUTION

!

HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC POWER IN­CLUDING REMOTE DISCONNECTS BEFORE
SERVICING. FAILURE TO DISCONNECT
POWER BEFORE SERVICING CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.

USE COPPER CONDUCTORS ONLY.
UNIT TERMINALS ARE NOT DESIGNED TO
ACCEPT OTHER TYPES OF CONDUCTORS.
FAILURE TO DO SO MAY CAUSE DAMAGE
TO THE EQUIPMENT.

IM 747 Page 3 of 32

WARNING

!

CAUTION

CUS

Extreme temperature hazard. Can cause damage to system
components.

This MicroTech II controller is designed to operate in ambient
temperatures from -40°F to 158°F. It can be stored in ambient
temperatures from -65°F to 176°F. The controller is designed to
operate in a 10% to 90% RH (non-condensing) and be stored in a
5% to 95% RH (non-condensing) environment.

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 harmful interference when the equipment is
operated in a normal commercial environment. Operation of this
equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference
at his own expense.

McQuay International disclaims any liability resulting from
any interference or for the correction thereof.

!

Introduction

This manual contains information regarding
the MicroTech II™ Direct Digital Control
(DDC) system used in the

®

-HermanNelson® Unit Ventilator

AAF
product line. It describes the MicroTech II

Table 1. Model-Specific Unit Ventilator Installation Literature

Unit Ventilator

Model Designations

AED, AEQ Air Source Heat Pump IM 502
ARQ, ERQ Water Source Heat Pump IM UV-3-202

AZS, AZQ, AZV, AZU, AZR Self-contained Air Conditioner IM 503

AVS, AVV, AVR, AVB Vertical Floor Buildup and Split-system
AHF, AHV, AHR, AHB Horizontal Ceiling Buildup and Split-system

components, input/output configurations, field
wiring options and requirements.
For installation and commissioning
instructions and general information on a
particular unit ventilator model, refer to the

Description Data Bulletin

appropriate model-specific installation and
maintenance bulletin, see Table 1.

Installation & Maintenance

Number

IM 725

For a description of unit operation and information on using the Local User Interface (LUI) to view data and set control parameters, refer to the
appropriate software model-specific operation manual, see Table 2.

Table 2. Software Model-Specific Operation and Maintenance Literature

Type UV Description Software Model UV Model OM Bulletin

2 Pipe Damper Control, Chilled Water/Hot Water 12 AVS, AHF OM 755

2 PIPE

4 PIPE

2CLG

DX Direct Expansion Only 5 AVV, AHV, AZV, AZU OM 751

DX/WET

ASHP Air Source Heat Pump 0 AEQ, AED OM 748

WSHP

2 Pipe Damper Control w/Wet Heat Only 10 AVS, AHF OM 754
2 Pipe Valve Control, Chilled Water/Hot Water 11 AVV, AHV OM 755
2 Pipe Valve Control w/Wet Heat Only 9 AVV, AHV OM 754
4 Pipe Damper Control, Chilled Water & Wet Heat 14 AVS, AHF
4 Pipe Valve Control, Chilled Water & Wet Heat 13 AVV, AHV, AVR, AHR
2 Pipe Damper Control, Chilled Water Only 16 AVS, AHF OM 757
2 Pipe Damper Control, Chilled Water & Electric Heat 18 AVS, AHF OM 758
2 Pipe Valve Control, Chilled Water Only 15 AVV, AHV OM 757
2 Pipe Valve Control, Chilled Water & Electric Heat 17 AVV, AHV OM 758
Direct Expansion & Electric Heat 4 AZV, AZU, AZR, AVV, AHV, AVR, AHR OM 750

Electric Heat Only 6 AVV, AHV OM 752
Damper Control, Direct Expansion and Wet Heat 8 AZS, AZQ, AVS, AHF
Valve Control, Direct Expansion and Wet Heat 7 AZV, AZU, AZR, AVV, AHV.

Water Source Heat Pump 2 ARQ, ERQ
Water Source Heat Pump with Electric Heat 3 ARQ, ERQ

OM 756

OM 753

OM 749

For installation and maintenance instructions on a particular plug-in communications module, refer to the appropriate protocol-specific installation
and maintenance bulletin, see Table 3. For network wiring or master/slave units, follow the network wiring instructions provided in IM 729.

Table 3. Protocol-Specific Communication Card Installation Literature

Unit Ventilator Available Protocols Operation Manual Bulletin Number

Unit Ventilator Unit Controller LonWorks® Communications Module IM 729
Unit Ventilator Unit Controller BACnet® Communications Module IM 731
Unit Ventilator Unit Controller JCI N2Open® Communications Module IM 730
Protocol Data Packet ED 15065

General Description

The AAF-HermanNelson unit ventilator
comes equipped with a Direct Digital Control
(DDC) system that controls the unit in response
to various inputs e.g. temperatures, etc., in
either a stand-alone or network controlled by
a compatible Building Automation System
(BAS) with communications capability in
one of several industry standardized protocols.
The unit can operate in several modes;
occupied, unoccuped, stand-by, and bypass

Page 4 of 32 IM 747

(tenant override). The MicroTech II controls
are made up of the following standard
components.
The MicroTech II Unit Ventilator Controller
(UVC) is a DDC microprocessor-based
controller designed to provide sophisticated
comfort control of an economizer-equipped
AAF-HermanNelson unit ventilator. In
addition to providing normal operating
control, the MicroTech II UVC provides alarm

monitoring and alarm-specific component
shutdown if critical system conditions occur.
Each UVC is factory wired, factory
programmed and factory run tested for the
specific unit ventilator model and
configuration ordered by the customer.
The operator can view actual temperatures,
set the most common operating parameters,
view alarms, etc., through use of the Local
User Interface (LUI). The LUI provides a

user adjustable security feature to protect
against unauthorized or accidental control
parameter changes. When networked with a

BAS, additional parameters can be remotely
read / set in addition to all those available on
the LUI.

This MicroTech II™ UVC is capable of
complete, stand-alone unit control or it can be
incorporated into a building-wide network
using an optional plug-in communication
module. Available communication modules
include BACnet

®

MS/TP, LonMark Space
Comfort Controller (SCC), and Metasys® N2
Open.
Optional MicroTech II UV ServiceTool
software can be used along with a PC to adjust
operating parameters within the UVC. The
UV ServiceTool software, while optional, is
very useful for trouble-shooting and
commissioning by allowing access to all user
adjustable parameters within the UVC
controller including many parameters not
available through the LUI. The UV
ServiceTool requires one of the optional plug­in communication modules as well as
additional hardware components dependent
upon which communications module is being
used.

Basic Component Data

The main components of the unit ventilator
MicroTech II DDC system include the Unit
Ventilator Controller (UVC), an expansion
board (EXP), the local user interface (LUI),
and optional plug-in communication modules.
Following are brief descriptions of these
components.

Unit Ventilator Controller
(UVC)

The UVC contains a 16-bit microprocessor
that is preprogrammed with the application
code required to operate the unit (see figure

1). The UVC supports up to 6 analog inputs,
12 binary inputs, and 9 binary outputs, (see
table 4). Optional network communications
is provided via plug in communication cards
that connect directly to the UVC. The UVC
supports additional I/O points via an I
communications bus used to add the EXP
board. The LUI connects directly to the UVC
and is limited to unit mounted applications.

2

Figure 1. MicroTech II Unit Ventilator Confroller (UVC)

Table 4. MicroTech II Unit Ventilator Confroller (UVC) Specifications

Power Supply 24 VAC +/-20% 50/60 Hz

Transformer Sizing 16 VA (Class 2)
Operating Temperature -4OF(-20OC) to 158OF(70OC)
Storage Temperature -40OF(-40OC) to 185OF(85OC)
Humidity 10%RH to 90%RH (non-condensing)

- CSA C22.2 NO. 205 – Signal Equipment

- CFR47 Part 15, Class A

- UL 873

- CE Directive 89/336/EEC

Agency Compliance Emissions: EN50081-1, EN61000-3-2, EN61000-3-3

Immunity: EN50082-1 and EN50082-2 (the most stringent
requirements of either, as applicable)

- C-Tick Directive

- Low Voltage Directive 73/23/EEC EN 60730

- AI-1,2,3,4,5,6

Analog Inputs

Binary Inputs - BI-3,4,5,6

C

Binary Outputs - BO-3,4,5,6,9

Positive Temperature Coefficient (PTC) Thermistor,
Reference Resistance = 1035 ohms @ 77OF(25OC)

- A/D Resolution: 10-bit (software enhanced to 12-bit)

- BI-1,2
Supports dry contact closure using on board 9 VDC. On board
jumpers are used to disable the BO-1 and BO-2 interlocks with BI-1
and BI-2.

Supports dry contact closure using on board 9 VDC

- BI-7,8,9,10,11,12
Supports dry contact closure using 24 VAC

(Note: all binary inputs can be daisy-chained from controller to controller
providing that polarity is respected)

- BO-1,2
120 VAC, 1 HP, 16 FLA, 96 LRA, 750 VA Pilot Duty
240 VAC, 2 HP, 12 FLA, 72 LRA, 1150 VA Pilot Duty
277 VAC, 3 HP, 14.1 FLA, 84.7 LRA, 1550 VA Pilot Duty
BO-1: 277 VAC, 16 A Resistive
BO-2: 277 VAC, 25 A Resistive

120 VAC, 1/10 HP, 3 FLA, 18 LRA, 100 VA Pilot Duty
240 VAC, 1/4 HP, 2.9 FLA, 17.4 LRA, 250 VA Pilot Duty
277 VAC, 1/3 HP, 2.98 FLA, 17.88 LRA, 300 VA Pilot Duty
277 VAC, 16 A Resistive

- BO-7,8
Triac, 24 VAC, Class 2, 5 VA Maximum

IM 747 Page 5 of 32

Expansion Board (EXP)

The EXP board provides additional I/O points required by the UVC for unit ventilator operation
(see figure 2). The EXP is operated and monitored by the UVC through the use of an I2C bus.
The EXP I/O board supports up to 4 analog inputs and 8 binary outputs
(see table 5).

Figure 2. Expansion Board (EXP)

Plug-in LonMark Space
Comfort Controller (SCC)
Communication Module
(optional)

The LonMark SCC communication module
is designed to be an add-on module to the
UVC for networking to Building Automation
Systems using LonWorks
communications. It supports the LonMark
Space Comfort Controller (SCC) profile
number 8500. It is an optional plug-in module
that can be attached to the UVC via a 12-pin
header and 4 locking standoffs to securely
attach it to the UVC.

®

network

Table 5. Expansion Board (EXP) Specifications

Operating Temperature

Storage Temperature

Humidity

Agency Compliance

Analog Inputs 0 to 10 VDC

Binary Outputs Triac, 24 VAC, Class 2, 5 VA Maximum

Same as UVC

- xAI-1,2
Ratiometric 0.5 to 4.5 VDC

- xAI-3

- xAI-4
Positive Temperature Coefficient (PTC) Thermistor,
Reference Resistance = 1035 ohms @ 77OF(25OC)

- A/D Resolution: 10-bit (software enhanced to 12-bit)

- xBO-1,2
120 VAC, 1/10 HP, 3 FLA, 18 LRA, 100 VA Pilot Duty
240 VAC, 1/4 HP, 2.9 FLA, 17.4 LRA, 250 VA Pilot Duty
277 VAC, 1/3 HP, 2.98 FLA, 17.88 LRA, 300 VA Pilot Duty
277 VAC, 16 A Resistive

- xBO-3,4,5,6

- xBO-7,8
120 VAC, 1 HP, 16 FLA, 96 LRA, 750 VA Pilot Duty
240 VAC, 2 HP, 12 FLA, 72 LRA, 1150 VA Pilot Duty
277 VAC, 3 HP, 14.1 FLA, 84.7 LRA, 1550 VA Pilot Duty
xBO-1: 277 VAC, 16 A Resistive
xBO-2: 277 VAC, 25 A Resistive

Figure 4. Lonworks SCC Communication

Module - (4" x 2") PN-107293127

Figure 5. Communication Module Location ­Behind Right Front Access Panel on AH Unit
Types, or Below the Top Right Access Door
on AV, AZ, AE, and AR Unit Types

®

Local User Interface (LUI)

The LUI provides the user a local unit mounted
interface which indicates the current unit
operating state and can be used to adjust many
unit ventilator operating parameters. The LUI
features a 2-digit display, 7 keys (1 key is
hidden), and 9 individual LED indicators.

Figure 3. Local User Interface (LUI)

Plug-in BACnet
MS/TP Communication
Module (optional)

The BACnet MS/TP communication module
is designed to be an add-on module to the
UVC for networking to Building Automation
and Control Network (BACnet) systems. It is
an optional plug-in module that can be attached
to the UVC via a 12-pin header and 4 locking
standoffs to securely attach it to the UVC (see
figure 6). It allows the UVC to inter-operate

Page 6 of 32 IM 747

with systems that use the BACnet Master
Slave / Token Passing (MS/TP) protocol with
a conformance level of 3. It meets the
requirements of ANSI/AHSRAE 135-1995
standard for BACnet systems.

Figure 6. BACnet MS/TP Communication

Module - (4" x 2") PN-107293126

Plug-in Metasys® N2 Open
Communication Module
(optional)

The Metasys N2 Open communication module
is designed to be an add-on module to the
UVC for networking to a Building Automation
System of the Metasys N2 type. It provides
N2 Open network communication capability
to the UVC. It is an optional plug-in module
that can be attached to the UVC via a 12-pin
header and 4 locking standoffs to securely
attach it to the UVC (see figure 7).

Figure 7. Metasys N2 Open Communication

Module - (4" x 2") PN-107293125

Master-Slave Communication
Modules (optional)

On master-slave unit ventilators a
communication module is designed to be an
add-on module to the UVC for peer-to-peer
communications. It is an optional plug-in
module that can be attached to the UVC via a
12-pin header and 4 locking standoffs to
securely attach it to the UVC. It allows the
UVC to inter-operate with another unit setup
for master slave communication capability.

NOTICE

Do not use master/slave units when a
BAS will be connected to the UVC.

NOTICE

Master/slave units will not be able to be
connected with other LonWorks devices
without re-performing the network
variable binding process in the field.

When using master/slave control, you
cannot use the Cycle Fan feature. Refer
to the appropriate software model-specific
operation manual for more information on
the Fan Cycle feature.

NOTICE

Master / Slave Control
(optional)

When it is desirable to have multiple units
within one space (i.e. conference rooms,
library, stairwells, cafeteria, etc.), and there is
no BAS present, it may be necessary to use
one master unit connected to one or more
slave units to ensure each unit within the
space operates in a like manner.
Each unit provided as a master or slave unit
will be factory provided with one master or
slave module. The factory will pre-bind
network variables from the master and slave
unit to provide the master / slave relationship.
This binding process will in effect “marry”
the master unit with its corresponding slave
units for the life of the communication
modules.
The UVC has been provided with a
configuration variable to select if slave units
will operate as Independent (default) or
Dependent slaves (see table 6).
Refer to Unit Ventilator Unit Controller
LonWorks Communications Module IM729
for wiring master/slave units.

NOTICE

For proper master/slave operation, it is
very important that the factory correctly
understand which units will be master,
which units will be slaves, and which
slaves will be connected to which master
units at the job site. It is the responsibility
of the purchaser when placing orders to
ensure that the factory understands these
things. It is strongly recommended that
each group of master/slave units be
purchased separately from stand-alone
units, or other master/slave unit groups,
to help ensure proper configuration.

Table 6. Master / Slave Network Variable Binding List

Master Variables Slave Variables Used With...

Space Temp Space Temp Independent Slave
Setpoint Output Setpoint Input
Effective Occupancy Occupancy Sensor

Fan Speed Output
Space Humidity Output Space Humidity Input Independent Slave

Outdoor Air Humidity Output Outdoor Air Humidity Input Independent Slave
Space CO2 Output Space CO2 Input Independent Slave
Primary Heat Output Primary Heat Input Dependent Slave
Secondary Heat Output Secondary Heat Input Dependent Slave
Primary Cool Output Primary Cool Input Dependent Slave
Secondary Cool Output Secondary Cool Input Dependent Slave

Fan Speed Independent Slave
Command Input and Dependent Slave

Independent Slave Control

Independent slave control allows a slave
unit(s) to use its own sensors in determining
if conditioning is required local to the slave
unit while forcing the slave to use the master
unit setpoints and unit mode. For example, if
the master is in heat mode, then the slave units
will be in heat mode, however, because this is
independent slave control some units may
actually be heating while other units remain
idle (no heating). If heating is not required in
the area local to a slave unit, cooling will not
be allowed in this case. This type of slave
control is ideal for spaces with varying loads
across the space such as stairwells, cafeterias,
etc.
When the master unit is provided with CO2
(optional) and or humidity (optional) sensors,
independent slave units will automatically
share the value of these sensors from the
master unit.

Dependent Slave Control

Dependent slave control forces the slave
unit(s) to follow the master unit operation.
This type of slave control is ideal for spaces
with consistent loads across the space such as
libraries, conference rooms, etc. With this
type of control, if the master is in heat mode
providing 20% of its heating capability, then
all slave units will be in heat mode providing
20% of their heating capability.

Independent Slave

IM 747 Page 7 of 32

Temperature Sensor

The UVC is configured to use passive Positive
Temperature Coefficient (PTC) unit-mounted
and wall-mounted sensors (see figure 8and
figure 31, 32, 33). These sensors vary their
input resistance to the UVC as the sensed
temperature changes (see table 7), see figure
9 for sensor locations.

Figure 8. Unit Mounted Sensor, for Outdoor
Air, Discharge Air, and Room Air

Table 7. Temperature Sensor Specifications

Type Passive Positive

Temperature Coefficient
(PTC) - Silicon Sensing
Element

Range -40OF(-40OC) to

212OF(100OC)

Reference Resistance 1035 ohms at 77OC(25OC)
Accuracy 0.9OF(0.5OC) between

5OF(-15OC) to 167OF(75OC)

Leads 22 AWG, 2-wire (white)

Figure 9. Sensor Locations

Discharge Air Sensor

Room Air Sensor

Holes in Front
Access Panel

Indoor Humidity Sensor

Outdoor
Air Sensor

Outdoor
Humidity Sensor

Outdoor Air Opening

Carbon Dioxide (CO2)
Sensor (optional) for
Demand

Controlled

Ventilation (DCV)

On units equipped for Demand Controlled
Ventilation (CO
is configured to use a 0-2000 PPM, 0-10
VDC, single beam absorption infrared gas
sensor (see figure 11 and table 9). The CO
sensor is used by the UVC’s CO2 Demand
Controlled Ventilation feature. CO
are available as unit mounted only. An air
collection probe (pitot tube and filter) is
installed in the return air of the unit (see figure

12).

Figure 11. Carbon Dioxide (CO2) Sensor

Figure 12. Air Collecting Probe

sensor installed), the UVC

2

sensors

2

2

Humidity Sensor (optional)

On units equipped with humidity sensors, the

Figure 10. Humidity Sensor

UVC is configured to use a 0-100% RH, 0-5
VDC, capacitive humidity sensor(s) (see
figure 10 and table 8). Humidity sensors are
available as unit mounted only. The humidity
sensors are used with units capable of passive
or active dehumidification, or with units using
outdoor enthalpy economizer or indoor/
outdoor enthalpy economizer.

Table 8. Humidity Sensor Specifications

Type Capacitive Humidity Sensor
Voltage Supply 5 VDC Nominal (4.75 VDC to 5.25 VDC)

Voltage Output

Operating Temp -22OF(-30OC) to 140OF(60OC)
Storage Temp -40OF(-30OC) to 158OF(70OC)
Humidity 0%RH to 100%RH (not affected by water immersion)
Sensing Range 1 to 99 %RH
Accuracy +/- 3 %RH Typical, +/- 5 %RH Maximum
Calibration Calibrated to within +/- 2 %RH at 55 %RH
Leads 24 AWG, 3-wire (blue-supply, yellow-output, white-ground)

The humidity sensor is not protected against reversed polarity. Check carefully when
servicing the device or equipment damage will result.

1 to 4 VDC output for 0 to 100 %RH at 5 VDC supply (ratiometric to
voltage supply) (70 ohm output impedence)

CAUTION

!

Pitot Tube

Filter

Table 9. Carbon Dioxide (CO2)

Type Single Beam Absorption

Operating Temp 60OF(15OC) to 90OF(32OC)
Storage Temp -40OF(-40OC) to

Humidity 0%RH to 95%RH

Power Supply 18 to 30 VAC 50/60 Hz
Transformer Sizing 1.75 VA (Class 2)
Sensing Range 0 to 2000 PPM
Voltage Output 0 to 10 VDC

Accuracy +/- 100 PPM or 7% of

Calibration

Sensor Specifications

Infrared Gas Sensor

158OF(70OC)

(non-condensing)

(100 ohm output impedance)

range whichever is greater
Self-calibration system
eliminates the need for
manual calibration in most
applications

Page 8 of 32 IM 747

Face & Bypass Damper
Actuator (optional)

On units equipped with a face & bypass
damper, the UVC is configured to operate a
floating-point (tri-state) face & bypass
damper, direct coupled actuator (see figure
13 and table 18).
To determine the modulating damper position
the UVC uses a separate factory preset,
configurable setting for each actuator's stroke
time. To ensure the accuracy of actuator
positioning the UVC is provided with an
overdrive feature for the 0% and 100%
positions and also periodic (12-hour) auto­zero algorithm for each modulating actuator.

Figure 13. Face & Bypass Damper Actuator

Figure 15. Damper Actuators Located in Left
End Compartment

For correct space control, and proper unit
operation, use End-of-Cycle (EOC) valves
in all face & bypass damper equipped
unit ventilators.

for the wet heat coil in any unit
ventilator that combines both a
refrigerant coil and a wet heat coil.
Use an EOC valve on all wet heat coils
to minimize the potential for
overheating.

Table 10. Face & Bypass Damper Actuator Specifications

Type Floating Point (tri-state), Direct Coupled Actuator
Power Supply 24 VAC +/- 20% 50/60 Hz
Power Consumption 2 W Running
Transformer Sizing 3 VA (Class 2)
Operating Temp -22OF(-30OC) to 122OF(50OC)
Storage Temp -40OF(-40OC) to 176OF(80OC)
Humidity 5%RH to 95%RH (non-condensing)
Torque 35 in-lb (4 Nm)
Run Time 80 to 110-second for 0 to 35 in-lb
Overload Protection Electronic throughout rotation
Manual Override External push button
Noise Level Less than 35 dB(A) Running
Direction of Rotation Reversible with built-in switch
Position Indication Clip-on Indicator
Leads 18 AWG, 3-wire (black-24 VAC common, red-ccw, white-cw)

CAUTION

!

An EOC valve is required

Outdoor Air/Return Air
Damper (OAD) Actuator

The UVC is configured to operate a floating­point (tri-state) Outdoor Air Damper direct
coupled, spring returned shut actuator (see
figure 14 and table 11). The OAD actuator
provides spring return operation upon loss of
power positive close-off of the outdoor air
damper.
To determine damper position the UVC uses
a separate factory preset, configurable setting
for each actuator's stroke time. To ensure the
accuracy of actuator positioning the UVC is
provided with an overdrive feature for the 0%
and 100% positions and also a periodic (12­hour) auto-zero algorithm for each modulating
actuator.

Figure 14. Outdoor Air/Return Air Damper
Actuator

Table 11. Outdoor Air/Return Air Damper (OAD) Actuator Specifications

Type Floating Point (tri-state), Spring Return, Direct Coupled Actuator
Power Supply 24 VAC +/- 20% 50/60 Hz
Power Consumption 2.5 W Running, 1 W Holding
Transformer Sizing 5 VA (Class 2)
Operating Temp -22OF(-30OC) to 122OF(50OC)
Storage Temp -40OF(-40OC) to 176OF(80OC)
Humidity 5%RH to 95%RH (non-condensing)
Torque 35 in-lb (4 Nm)
Run Time 90-second constant, independent of load
Overload Protection Electronic throughout rotation
Noise Level Less than 30 dB(A) Running, less than 62 dB(A) Spring Return
Direction of Rotation Spring: Reversible with cw/ccw mounting

Motor: Reversible with built-in switch

Position Indication Visual Indicator, 0O to 90O (0O is the spring return position)

Leads

18 AWG, 4-wire (red-24 VAC supply, black-24 VAC common, white-ccw,
green-cw)

IM 747 Page 9 of 32

2-position End-of-Cycle

Figure 16. 2-Position End of Cycle Valve
Actuator (EOC)

(EOC) Valves (option)

On units equipped with 2-way or 3-way end­of-cycle (EOC) valves, the UVC is configured
to operate 2-position End-Of-Cycle (EOC)
valve actuators (see figure 16 and table 12).
Spring return actuators are used for all End of
Cycle (EOC) valves. All wet heat and heat/
cool EOC valves are normally open, and all
cooling EOC valves are normally closed.

Table 12. 2-Position End of Cycle (EOC) Valve Actuator Specifications

Type 2-position, Spring Return, Electric Valve Actuator
Power Supply 24 VAC 50/60 Hz
Power Consumption 6.5 W Running
Transformer Sizing 7 VA (class 2)

Dependent upon valve ordered:

Fluid Limits at Ambient General: 32OF(0OC) to 200OF(93OC) at 104OF(40OC)
Temp Limit Steam: 32OF(0OC) to 250OF(121OC) at 169OF(76OC),

15 psig (103 kPa)

Run Time 9 to 11-seconds
Spring Return 4 to 5-seconds

Table 13. WSHP 2-Position Motorized Valve Actuator Specifications

Type 2-position, Spring Return, Electric Valve Actuator
Power Supply 24 VAC 50/60 Hz
Power Consumption 6.5 W Running
Transformer Sizing 7 VA (class 2)
Fluid Limits at Ambient
Temp Limit
Run Time 9 to 11-seconds
Spring Return 4 to 5-seconds

O

F(0OC) to 200OF(93OC) at 104OF(40OC)

32

WSHP 2-position Motorized
Water Valves (option)

On water source heat pump unit ventilators
equipped with a motorized water valve, the
UVC is configured to operate a 2-position
motorized water valve actuator (see figure 17
and table 13).
Spring return actuators are used for all
motorized water valves. All motorized water
valves are normally closed.

Figure 17. WSHP 2-Position Motorized
Water Valve

Modulating Valve Actuator
(option)

On units equipped with modulating valves,
the UVC is configured to operate floating­point (tri-state) actuators for modulating 2­way and 3-way valves (see figure 18 and 19,
and table 14).
Spring return actuators are used for all
Modulating valves. All wet heat and heat/

Table 14. Modulating Valve Actuator Specifications

Type Floating Point (tri-state), Spring Return, Electric Valve Actuator
Power Supply 20 to 30 VAC 50/60 Hz
Transformer Sizing 12 VA (class 2)
Operating Temp 32OF(0OC) to 122OF(50OC)
Storage Temp -85OF(-65OC) to 185OF(85OC)

Humidity

Fluid Temp Limits 35OF(2OC) to 250OF(121OC); 15 psig (103 kPa) saturated steam
Force Output Minimum 61 lb (271 N)
Maximum Stroke 29/32 in. (23 mm)
Run Time 76-seconds (proportionally less for shorter stroke)
Spring Direction Stem-up, 3 to 15-seconds spring return
Noise Level 35 dB(A)

Leads

90 %RH non-condensing at 70OF(21OC) ambient temperature and
40OF(4OC) fluid temperature

20 AWG, 4-wire (yellow-24 VAC supply, white-24 VAC common, white/
brown-stem up, brown-stem down)

cool valves are normally open, all cooling
valves are normally closed.
To determine modulating valve position the
UVC uses a separate factory preset,
configurable setting for each actuator's stroke
time. To ensure the accuracy of actuator
positioning the UVC is provided with an
overdrive feature for the 0% and 100%
positions and also periodic (12-hour) auto­zero algorithm for each modulating actuator.

Figure 18. 2-Way Modulating Valve Actuator

Figure 19. 3-Way Modulating Valve Actuator

Page 10 of 32 IM 747