Microtech 325 Installation & Maintenance Data

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Page 1

MicroTech

U nit Ventilator Controller

Installation & Maintenance Data

IM 613-1

Group: Unit V entilator P art No.: 106102101 Date: July 1999

Used with AAF-HermanNelson Models AVS, AVV, AVR, AHF,

AHV, AHR, AED, AEQ, AZS, AZQ, AZR, ARQ, ERQ

HermanNelson

Page 2

Table of Contents

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

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Component Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Setpoint Adjustment Potentiometers . . . . . . . . . . . . . . 5

Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Hex Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Communication Ports . . . . . . . . . . . . . . . . . . . . . . . . . 6

Temperature Sensors . . . . . . . . . . . . . . . . . . . . . . . . . 6

Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Standard Control Features . . . . . . . . . . . . . . . . . . . . . . . 6

Control Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Change and Step-&-Wait Algorithms . . . . . . . . . . . . . . 6

Compressor Short-Cycle Protection . . . . . . . . . . . . . . 7

Low Ambient Lockout . . . . . . . . . . . . . . . . . . . . . . . . . 7

Random Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Delayed Reversing Valve De-energization . . . . . . . . . 7

Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Alarm Monitoring & Controlled Response . . . . . . . . . . 7

Factory Configured Options . . . . . . . . . . . . . . . . . . . . . 8

Communication Type . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ASHRAE Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Room Temperature Sensor . . . . . . . . . . . . . . . . . . . . . 9

Remote Room Setpoint Adjustment . . . . . . . . . . . . . . 9

Tenant Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Day-Night Changeover . . . . . . . . . . . . . . . . . . . . . . . . 9

Ventilation Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Exhaust Fan Interlock . . . . . . . . . . . . . . . . . . . . . . . . . 9

Software ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Required Tools and Literature . . . . . . . . . . . . . . . . . . 11

Unit Ventilator Identification . . . . . . . . . . . . . . . . . . . . 11

Field Wiring Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Setpoint Initialization . . . . . . . . . . . . . . . . . . . . . . . . . 12

Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Stand-alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Master/Slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Diagnostics & Service . . . . . . . . . . . . . . . . . . . . . . . . . 18

Alarm Monitoring & Control . . . . . . . . . . . . . . . . . . . . 18

Fault Code Interpretation . . . . . . . . . . . . . . . . . . . . . . 18

Clearing Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Alarm Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

PC Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

UVC Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . 21

Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

UVC Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Valve & Damper Actuator Calibration Procedures . . 29

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

List of Illustrations

Figures:

1. MicroTech Unit Ventilator Controller . . . . . . . . . . . . . . . 4

2. Hex Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3. Software ID Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. Digital Input Wiring Example . . . . . . . . . . . . . . . . . . . . 22

5. Relay Output Wiring Example . . . . . . . . . . . . . . . . . . . 22

6. Barber-Colman Actuator Position

Feedback Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

IM 613 / Page 2 (Rev. 7/99)

Tables:

1. Status LED Indication . . . . . . . . . . . . . . . . . . . . . . . . 5

2. Hexadecimal to Decimal Conversion Guide . . . . . . . . 5

3. Alarm & Controlled Response Feature Availability . . 7

4. Programs and Software Models . . . . . . . . . . . . . . . . 10

5. Model-Specific Unit Ventilator Installation Literature 11

6. Program-Specific Sequence of Operation Literature 11

7. Network UVC Default Setpoints . . . . . . . . . . . . . . . . 12

8. Network Communications Port Terminal

Voltage Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9. Alarm and Fault Code Summary . . . . . . . . . . . . . . . 18

10. RS-232 Communications Cable Terminations . . . . . 21

11. Inputs and Outputs for Program UV1*** Units . . . . . 22

12. Inputs and Outputs for Program UV2*** Units . . . . . 23

13. Inputs and Outputs for Program UV3*** Units . . . . . 23

14. Inputs and Outputs for Program UV4*** Units . . . . . 24

15. Inputs and Outputs for Program UV5*** Units . . . . . 24

16. Inputs and Outputs for Program UV6*** Units . . . . . 25

17. Inputs and Outputs for Program UV7*** Units . . . . . 25

18. Thermistor Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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Introduction

Certified Drawing

This manual provides information pertaining to the MicroTech Unit Ventilator Controller (UVC) as applied in the AAF-HermanNelson Unit Ventilator product line. It should be used

CAUTION This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. It has been tested and found to comply with the limits for a Class B 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 residential environment. AAF-HermanNelson

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

This MicroTech controller contains static electricity sensitive components. A static discharge while handling electronic circuit boards may cause damage to the components. T o prevent such damage during service involving board replacement, discharge any static charge by touching grounded bare metal inside the unit before performing any service work.

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.

WARNING

This MicroTech control panel is designed to be stored and operated in temperatures from 32°F to 140°F and in relative humidity up to 95% (noncondensing).

in conjunction with the separate installation (Bulletin No. OM101 through OM107) and sequence of operation literature (see Tables 5 and 6).

CAUTION

WARNING

IM 613 / Page 3 (Rev. 7/99)

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General Description

The MicroT ech Unit V entilator Controller (UVC) is a microprocessor-based controller designed to provide sophisticated control of an economizer-equipped AAF-HermanNelson unit ventilator. In addition to providing normal operating control, the MicroT ech UVC provides alarm monitoring and alarm-specific component shutdown if critical system conditions occur.

Each UVC is factory wired and factory programmed for the specific unit ventilator model and configuration options ordered by

Component Data

Figure 1. MicroTech Unit Ventilator Controller

Communication

Ports

Digital Inputs

30 40

LED GO

100

1 2 3 4 5 6 R 5 4

UNOCCUPIED

°F

OFFSET

J7 J8

RELAY OUT

H12345678

HEATING SETPOINT

Minimum OA Damper Position Pot

Unoccupied Offset Pot

Heating Setpoint Pot

1 2 3

COMMB COMM A DIGITAL INPUT

0 MINIMUM OA

POSITION

MicroTech 325 Controller

This device complies with part 15 of the FCC rules. Operation is subject to the following 2 conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation.

the customer. The UVC can be wired and programmed to operate as a stand-alone controller, as a master or slave controller, or as a MicroTech network controller.

Communication ports allow networking capability and access to any UVC from an IBM compatible personal computer (PC) equipped with Monitor software.

The MicroTech Unit Ventilator Controller (UVC) is shown in Figure 1.

Analog Inputs

GGGGGGS S S S S S GSGS

8060

AUX OUT V910

(COOLING SETPOINT IS FACTORY SET 6° F ABOVE

HEATING SETPOINT)

SERIAL EOS

PROG

PART NO. 107627201

STATUS POWER

IN3IN4IN5IN6IN7IN12IN13

IN2

HI LO

NETWORK

ADDRESS

PWR

G 24V

GS1SO

Hex Switches

EOS + S/N tag

Software ID tag

Electro-Mechanical Relays

Remote Status

LED Output

Relay Outputs

IM 613 / Page 4 (Rev. 7/99)

Auxiliary

Outputs

(TRIAC)

STATUS POWER

Status LED

Power Supply LED

Page 5

Microprocessor

The UVC contains a microprocessor that is preprogrammed with the software required to monitor and control the unit. It receives input data from as many as 20 inputs (analog or digital) and sends commands to as many as 8 outputs (electromechanical relays). (There are 2 additional solid-state relay “aux” outputs which are not used for standard unit ventilator configurations.) The quantities and types of inputs and outputs are dependent on the unit ventilator model type and configuration options. All input and output connections to the UVC are made using insulation displacement type (IDC) terminal connectors.

The UVC uses field-adjustable setpoints and fixed, preprogrammed parameters to maintain unit control. (Many of the preprogrammed parameters can be adjusted with a PC equipped with Monitor software.)

Setpoint Adjustment Potentiometers

There are three setpoint adjustment potentiometers (pots) on the UVC:

• Minimum outdoor air damper position pot

• Heating setpoint pot

• Unoccupied offset adjustment pot Note: On slave and network controllers, these three setpoint

values are received via network communications, and the pot settings are ignored. On slave controllers only, the pot settings are used when communications are lost. Therefore, it is recommended that appropriate “default” pot settings be set for slave units.

Table 1. Status LED Indication

Status LED State Indication

Certified Drawing

On Continually Occupied Mode On 1⁄2 sec./ Off 51⁄2 sec. Unoccupied Mode On 51⁄2 sec./ Off 1⁄2 sec. Tenant Override Mode Flashing* Alarm Condition

On 3 sec. / off 3 sec.** Calibration * Refer to Table 9 in the “Alarm Monitoring & Control” section of this manual. ** Calibration of OA Damper, F&BP Damper, and/or valve actuators will be

completed within approximately 5-min after power-on.

on-board status LED. If used, the remote LED is connected to the UVC at the terminal section labeled “LED.”

Power LED

The green, on-board power LED indicates microprocessor “on” status. After applying power to the unit, the power LED should illuminate continuously. For more information, refer to “Test Procedures” in the “Service Information” section of this manual.

Hex Switches

The UVC includes two hex (hexadecimal) switches that may need to be set. The HI and LO hex switches are shown in Figures 1 and 2. Table 2 provides a hex-to-decimal conversion guide.

Figure 2. Hex Switches

Minimum Outdoor Air Damper Position Pot

The minimum position pot defines the minimum outdoor air (OA) damper position. The OA damper is typically held at its minimum position when cooling is not required or when the OA temperature is not suitable for free cooling. Refer to the sequence of operation document provided with your unit for more detailed information.

Heating Setpoint Pot

The heating setpoint pot adjusts both the occupied cooling and heating setpoints. The room occupied heating setpoint is shown on the UVC faceplate. The room occupied cooling setpoint is calculated by adding the deadband value to the heating setpoint (deadband default = 6°F).

Unoccupied Offset Adjustment Pot

The unoccupied offset pot sets the offset value used to determine the unoccupied heating (or night setback) and unoccupied cooling (or night setup) setpoints. The night setback setpoint is calculated by subtracting the offset value from the occupied heating setpoint. The night setup setpoint is calculated by adding the offset value to the occupied cooling setpoint.

Status LED

An amber, on-board status LED aids in diagnostics by indicating the unit ventilator operating mode and alarm conditions. If there are no current alarm conditions, the LED will indicate the unit operating mode as shown in Table 1. If there are one or more alarm conditions present, the LED will flash in a specific sequence to indicate a particular alarm condition. For more information on alarms, refer to the “Alarm Monitoring & Control” section of this manual.

A remote status LED is provided with all optional wall- mounted temperature sensor packages. It has the same function as the

A “hex switch setting” is defined as the HI switch digit followed by the LO switch digit. For example, a hex switch setting of 2F would have the HI switch set to “2” and the LO switch set to “F.”

Stand-alone Units

On compressor-equipped units (self-contained or split system), the hex switch setting defines the random start delay period. Each unit on a common circuit or time clock should have a different hex switch setting to ensure that multiple units do not start simultaneously. The settings may be between 01 and 3F.

If the unit ventilator has no compressor, leave the hex switch setting at 01.

Master, Slave and Network Units

The hex switch setting defines the controller’s network address. (If the master, slave or network unit has a compressor, the random start delay is also defined by the hex switch setting.) For more information on master/slave addressing, refer to “Master/ Slave” in the “Start-up” section of this manual. For more information on MicroTech network addressing, refer to the MicroTech Network Master Panel installation bulletin.

Table 2. Hexadecimal to Decimal Conversion Guide

HI Hex

Digit 0123456789ABCDEF

0 0*123456789101112131415 1 16171819202122232425262728293031 2 32333435363738394041424344454647 3 48495051525354555657585960616263

* Hex switch setting 00 has a special purpose. It should not be used for

normal operation.

LO Hex Digit

IM 613 / Page 5 (Rev. 7/99)

Page 6

Communication Ports

The UVC has two communication ports: Comm A and Comm B. Following are brief descriptions of each communication port’s function. For further information, refer to the “Service Information” section of this manual.

Stand-alone and Network Units

Comm B is for MicroTech network communications to the Local Master Controller using an RS-485 format. (Comm B is configured this way in a stand-alone unit, but not used.) Comm A is for communications to an IBM compatible PC using an RS-232 format.

Master/Slave Units

Communications between master and slave UVC’s is done using an RS-485 format. On the master unit, Comm B is used for communications to the slaves, and Comm A is not used. On a slave unit, Comm B is used for communications to the master, and Comm A is available for communications to an IBM compatible PC using an RS-232 format.

Temperature Sensors

The MicroT ech UVC uses negative temperature coef ficient (NTC) thermistors for temperature sensing. A thermistor chart, which provides voltage-to-temperature and resistance-to-temperature conversion data, is included in the “Service Information” section of this manual (Table 18).

Actuators

The UVC uses hydraulic, spring return, floating control actuators with position feedback for valve and damper modulation. These actuators are controlled using the “Change” and “Step-and-Wait” control algorithms. All cooling valves are normally closed, and all heating valves (including “2-pipe” hot/chilled water) are normally open. Outside air dampers are normally closed, and face and bypass (F&BP) dampers are normally open to the coil face.

On some units equipped with F&BP dampers, a spring return, two-position “end-of-cycle” (EOC) valve is used to prevent overheating or overcooling when the damper is in the full bypass position. Cooling EOC valves are normally closed, and heating EOC valves (including “2-pipe” hot/chilled water) are normally open.

Standar d Control Features

The following are standard MicroTech UVC control features as applicable to the various unit ventilator model types:

• Control Temperature

• Change and Step-&-Wait control algorithms

• Compressor short-cycle protection

• Low ambient lockout

• Random start

• Delayed reversing valve de-energization

• Emergency heat

• Defrost

• Alarm monitoring & controlled response

Control Temperature

All unit ventilators are designed to control the room (or zone) temperature. In order to maintain more stable room temperature control, the UVC uses the concept of a “Control Temperature.” Depending on the unit ventilator model, configuration, and current mode of operation, the Control Temperature could be either (1) the actual room temperature or (2) a weighted value equal to 19/20 room temperature and 1/20 discharge air temperature.

Throughout the remainder of this manual, “room temperature” and “Control Temperature” will be assumed to be synonymous. For further information, refer to the sequence of operation document provided with your unit (see Table 6).

Change and Step-&-Wait Algorithms

The “Change” and “Step-and-Wait” algorithms work together in a

two-stage process to modulate actuators (valves or dampers) in the unit ventilator. This control process enables the UVC to maintain tight space temperature control with no overshoot.

There are several Change and Step-and-Wait parameters that are factory set and adjustable only with a PC equipped with Monitor software. For most applications, the factory-set parameters will provide the best control. It is recommended that these values not be changed.

Following is a brief description of the Change and Step-and-Wait functions. For additional information, refer to the

Ventilator Controller Monitor Program User’s Manual

Change

The Change function changes the valve or damper position

setpoint

from its setpoint (offset). The amount of actuator-position setpoint change varies and is dependent on the amount of room temperature setpoint offset.

The Change algorithm is executed on a factory-set, periodic basis.

Step-and-Wait

The Step-and-Wait function causes the valve or damper to open or close as required to maintain the Change function’s calculated position setpoint. The “step” period is the amount of time the electric actuator is driven either open or closed, and the “wait” period is the amount of time the actuator holds its position. The “step” and “wait” periods vary and are dependent on the amount of actuator-position setpoint offset.

The Step-and-Wait algorithm is executed on a periodic basis. This period is a factory-set constant that is equal to the sum of the “step” and “wait” periods described above.

in response to the deviation of the room temperature

MicroTech Unit

IM 613 / Page 6 (Rev. 7/99)

Page 7

Compressor Short-Cycle Protection

All compressor-equipped unit ventilator models (self-contained or split system) include compressor short-cycle protection.

When a compressor is energized, it will remain energized for at least 2 minutes before the temperature control sequence will be allowed to de-energize it. An alarm condition can override this “minimum-on” timer and stop the compressor if necessary.

When a compressor is de-energized, it will remain de-energized for at least 3 minutes before the temperature control sequence will be allowed to energize it again.

Low Ambient Lockout

Except for the water source heat pump (WSHP) models, all compressor-equipped unit ventilators (self-contained or split system) include compressor low ambient lockout protection.

This feature will prevent compressor operation when the unit is in the cooling mode and the outdoor air temperature is below 59°F.

Random Start

A random start feature is provided with all compressor-equipped unit ventilators (self-contained or split system). This feature will prevent simultaneous compressor start-up that could otherwise occur after the following events:

• Unit power-up

• Unoccupied to occupied changeover

• Brownout condition The compressor start delay can be from 1 to 63 seconds and is

determined by the UVC hex switch setting. For more information, refer to “Hex Switches” in the “Component Data” section of this manual.

Delayed Reversing Valve De-energization

All heat pump unit ventilator models have a 60-second (default) reversing valve de-energization delay feature.

This delay prevents the reversing valve from returning to its normal (cooling) position for a period of 60 seconds after the compressor is de-energized when the unit is in the heating mode. If necessary , an alarm condition can override the 60-second timer and de-energize the reversing valve with the compressor.

Emergency Heat

All heat pump unit ventilator models that are equipped with electric heat have an emergency heat feature.

The emergency heat mode is initiated by depressing the momentary, unit-mounted emergency heat switch. When the unit is in the emergency heat mode, the following actions occur:

• Compressor is immediately de-energized and locked out.

• Reversing valve is de-energized after a delay.

• Electric heat is staged to maintain the room heating setpoint regardless of outdoor air temperature (ASHP units) or entering water temperature (WSHP units).

The unit ventilator may be returned to normal operation by cycling power to the controller (use fan switch or main power switch).

ASHP Units Only: Note that the emergency heat switch (SW5) and defrost control contacts are wired in parallel and use the

Certified Drawing

same UVC digital input (DI-3). The emergency heat switch provides a momentary contact closure and the defrost control provides a maintained contact closure. Therefore, do not hold the emergency heat switch down or the unit may enter the defrost mode instead of the desired emergency heat mode.

Defrost

The AE air source heat pump (ASHP) unit ventilator models have a defrost cycle which prevents frost from building up on the outdoor coil when the unit is operating in the heating mode.

An external defrost control provides a maintained contact closure to the UVC when defrost is required.

When the unit is in the defrost mode, the following actions occur:

• Reversing valve is de-energized (unit enters “cooling” cycle).

• Electric heat is staged to maintain the room setpoint regardless of outdoor air temperature.

• Compressor cannot be de-energized by room temperature control until defrost mode ends.

For further information on the defrost control cycle, refer to Bulletin No. OM 101, MicroTech Unit Ventilator Controller Sequences of Operation: Program UV1.

Alarm Monitoring & Controlled Response

The MicroTech UVC is capable of sophisticated alarm monitoring and controlled response functions. Each alarm (or “fault”) is prioritized, indicated, and responded to with the appropriate action. If multiple alarms are present, the alarm with the highest priority is indicated.

A summary of the available alarm features is shown in Table 3. For more information, refer to the “Alarm Monitoring & Control” section of this manual. Following are brief descriptions of each feature.

Tab le 3. Alarm & Controlled Response Feature Availability

Alarm & Controlled Response Feature

Sensor Diagnostics (Each Sensor) • • • • • Actuator Feedback Diagnostics

(Each Actuator) Brownout Protection • • • • •

High Pressure • • • Low Coil Temperature (DX and/or Water) • • • • • Low Refrigerant Temperature (Water Coil) • Communication Error (Master/Slave Only) • • • • • Change Filter (Network Units Only) • • • • •

Unit Ventilator Model

AE AZ AR AV AH

•••••

IM 613 / Page 7 (Rev. 7/99)

Page 8

Sensor Diagnostics

If a temperature sensor’s value is out of range, the UVC will detect it and take the appropriate action. Each sensor fault has a specific priority, alarm indication, and set of response actions.

Actuator Feedback Diagnostics

The UVC will monitor the position feedback voltages of every modulating actuator provided with a particular unit ventilator. If a feedback value is out of range, the UVC will detect it and discontinue control of that actuator. Each feedback failure fault has a specific priority and alarm indication.

Brownout Protection

The brownout feature is meant to protect the compressor and electric heat contactors from low voltage or “brownout” conditions. If the supply voltage to the unit ventilator is below 85% of the nameplate value, the UVC will detect it, indicate it, and de-energize the compressor and electric heaters.

High Pressure

If excessive pressure in the refrigeration circuit is detected by the external pressure switch, the compressor will be de-energized immediately (hardware wired). The UVC will immediately de-energize the reversing valve, disable the compressor and indicate the alarm.

Factory Configured Options

Low Coil Temperature

External thermostats will sense the DX and water coil temperatures (if present). The UVC will monitor each thermostat, and if a low coil temperature is detected, alarm indication and the appropriate action will occur.

Low Refrigerant Temperature (Water Coil)

If the WSHP unit is in the heating mode and the refrigerant temperature is too low, the UVC will indicate the alarm and immediately de-energize the compressor and reversing valve.

Communication Error (Master/Slave Units Only)

If a communication error occurs between a slave UVC and its master, the alarm will be indicated at the slave, and the affected units will continue operating. For further information, refer to the description of the master/slave communication type in the “Factory Configured Options” section of this manual.

Change Filter (Network Units Only)

When the unit ventilator fan run-time exceeds a networkadjustable setpoint, a change filter alarm is indicated locally and over the MicroTech network.

In addition to the various heating and cooling options, the AAF-HermanNelson product line provides several factoryconfigured options that affect installation requirements and unit control. These options are either factory programmed, factory wired, or both. The model number code string specifies which options are present in a particular unit ventilator. The following options are described in this section:

• Communication type (stand-alone, master/slave or network)

• ASHRAE cycle II

• Room temperature sensor (unit or wall mounted)

• Tenant override (unit or wall mounted)

• Remote room setpoint adjustment

• Day-night changeover

• Ventilation lockout

• Exhaust fan interlock

Communication Type

All Unit Ventilator Controllers can be programmed to operate in one of the following communication modes:

• Stand-alone

• Master/slave

• MicroTech network

Stand-alone

A stand-alone UVC does not communicate over a network. It is independent and capable of performing complete room temperature and ventilation control.

Master/Slave

The master/slave application is designed to provide even temperature control of a zone containing up to six unit ventilators. One controller in the zone must be designated and programmed to be the master, and up to five controllers may be designated and programmed to be its slaves.

IM 613 / Page 8 (Rev. 7/99)

The master controller establishes the following parameters for itself and for each of its slaves:

• Operating mode (occupied, unoccupied, or tenant override)

• Minimum OA damper position setpoint

• Occupied heating and cooling setpoints

• Unoccupied heating and cooling setpoints Because each UVC in the zone uses its own room

temperature sensor and a common room temperature setpoint, even temperature control will be maintained regardless of any load variation within the zone.

Master: A master UVC is similar to stand-alone UVC. The only difference is that Comm B of a master controller is used for master/slave network communications. The minimum position setpoint, room setpoint, unoccupied offset, operating mode, and remote setpoint adjustment (if used) must be set at the master.

Slave: A slave UVC receives its operating mode and the above setpoint information from its master. When communications are established between a slave and its master , the slave will ignore its three on-board setpoint potentiometers.

Communication Failure: If the communication link between a slave and its master fails, the slave UVC will indicate the alarm and continue to operate using the temperature and minimum position setpoints defined by its on-board potentiometers. Its operating mode will be that last received from its master, or if power is cycled, it will default to occupied.

MicroTech Network

A variety of MicroTech unit and auxiliary controllers can be interconnected to form a MicroTech network. A MicroTech network provides a building operator with the capability to perform advanced equipment control and monitoring from a central or remote location. A network UVC is a controller that has been programmed with the software required to operate in a MicroTech network. The following features are provided for each network UVC over the MicroTech network:

Page 9

• Day-night changeover scheduling

• Heating and cooling setpoint adjustment

• Minimum OA damper position setpoint adjustment

• Ventilation lockout

• Change filter alarm

• Demand limiting Communication Failure: If the MicroTech network communica-

tion link failures for any reason, the affected UVC will remain operational. Its operating mode will be that last received over the network, or if power is cycled, it will default to occupied. Its minimum position, heating, and cooling setpoints will be those last received over the network, regardless of whether power is cycled.

Except for the fact that it is temporary, the tenant override operating mode is identical to the occupied operating mode.

Certified Drawing

Unit Mounted Tenant Override Switch

The optional unit mounted tenant override switch is factory installed and factory wired.

Wall Mounted Tenant Override Switch

The wall mounted tenant override switch is available with several of the optional wall sensor packages. The wall sensor package must be field installed and field wired to the unit ventilator. Refer to the model-specific unit ventilator installation manual and to Bulletin No. IM 529, MicroTech Room Temperature Sensors, for information on wall sensor package installation.

ASHRAE Cycle

All unit ventilator controllers are factory programmed to follow ASHRAE II unit ventilator control cycle. The UVC uses the room temperature sensor to control the heating, ventilating, and cooling functions of the unit ventilator.

ASHRAE II Cycle

A discharge air temperature sensor is installed in all unit ventilators. If necessary, the ASHRAE II control algorithm can override room control and modify the heating, ventilating, and cooling functions (as available) to prevent the discharge air temperature from falling below the discharge air low limit setpoint. The discharge air low limit setpoints and sequences of operation vary and are dependent on the unit ventilator model and configuration. For further information, refer to the sequence of operation document (Bulletin No. OM101 through OM107) provided with your unit.

Room Temperature Sensor

A room temperature sensor is required for all unit ventilators. It may be unit mounted or wall mounted.

Unit Mounted Sensor

The unit mounted room sensor is factory installed and factory wired. It is located within an aspirating sampling chamber behind the unit ventilator fan access panel.

Wall Mounted Sensor

There are optional wall sensor packages available. All wall sensors include a remote status LED. Tenant override, setpoint adjustment, and bimetal thermometer are optional wall sensor features that are available in any combination.

The wall mounted sensor must be field installed and field wired to the unit ventilator. Refer to the model-specific unit ventilator installation manual and to Bulletin No. IM 529, MicroT ech Room Temperature Sensors, for information on wall sensor package installation.

Day-Night Changover

Day-night changeover control is required to change the unit ventilator operating mode from occupied (default) to unoccupied. When the unit is in the unoccupied operating mode, the OA damper is closed, and the night setback and setup room setpoints are maintained. The fan is energized only when heating or cooling is required. For further information, refer to sequence of operation document provided with your unit.

Stand-alone and Master Units

The day-night changeover function is provided by a factoryinstalled or field-installed device. The following changeover options are available:

• Relay (24 VAC coil for field connection)

• Time clock and holiday switch

• Manual day-night switch

• Pneumatic-electric (PE) switch or relay (field supplied & installed)

All of the above methods must provide a maintained contact closure (at DI-2) to place the UVC into the unoccupied operating mode. When the contacts are open (or if none are provided), the unit will be in the occupied operating mode.

Network Units

The day-night changeover function is provided over the MicroTech network. It can be scheduled for every controller on the network using the UVC Monitor program.

Ventilation Lockout

The ventilation lockout option provides a means of overriding normal UVC control and closing the outdoor air damper at any time.

Stand-alone, Master, and Slave Units

When the ventilation lockout option is ordered, a relay (24 or 115 VAC) is factory installed and wired to the UVC. The OA damper will close when the field-connected relay coil is energized.

Remote Room Setpoint Adjustment

The remote setpoint adjustment potentiometer allows the room setpoint to be adjusted up or down by as much as 3°F. It is available with several of the optional wall sensor packages, and it may be used with all except slave-type Unit Ventilator Controllers.

Tenant Override

A unit mounted or wall mounted tenant override switch is available for use with all except slave-type Unit Ventilator Controllers. The tenant override switch provides a momentary contact closure that causes the unit to enter the “tenant override” operating mode for a set time period (default = 120 minutes).

Network Units

The ventilation lockout function is provided over the MicroTech network.

Exhaust Fan Interlock

The exhaust fan interlock option provides a means of overriding normal UVC control and fully opening the outdoor air damper at any time. Typically, this application is used to supply makeup air when an exhaust fan is energized.

When the exhaust fan interlock option is ordered, a relay (24 VAC) is factory installed and wired to the UVC. The OA damper will open when the field-connected relay coil is energized.

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Page 10

Software ID

Unit Ventilator Controller software is factory installed and tested in each unit prior to shipment. The software is identified by a program code and “software model” number printed on a small label attached to the controller. Refer to Figure 3.

Figure 3. Software ID Tag

Software ModelProgram Number

Table 4. Programs and Software Models

Program

UV1*** MDL00 • ASHP with Electric Heat UV2***

UV3*** MDL05 • • DX Cooling Only

UV4***

UV5***

UV6***

UV7***

Abbreviations: ASHP Air source heat pump WSHP Water source heat pump

Software

Model AE AZ AR AV AH Description

MDL02 • WSHP with Electric Heat MDL03 • WSHP Only MDL04 • • • DX Cooling with Electric Heat

MDL06 • • Electric Heat Only MDL07 • • • DX with Wet Heat, Valve Control MDL08 • • • DX with Wet Heat, Damper Control MDL09 • • Wet Heat Only, Valve Control MDL10 • • Wet Heat Only, Damper Control MDL11 • • 2-Pipe, Valve Control MDL12 • • 2-Pipe, Damper Control MDL13 • • 4-Pipe, Valve Control MDL14 • • 4-Pipe, Damper Control MDL15 • • CW Cooling Only, Valve Control MDL16 • • CW Cooling Only, Damper Control MDL17 • • CW with Electric Heat, Valve Control MDL18 • • CW with Electric Heat, Damper Control

Unit Ventilator Model

DX Direct expansion (refrigerant) CW Chilled water Wet Heat Steam or hot water heat

Table 4 shows the 7 programs and 18 software models used for the various unit ventilator models and configurations. As shown in the table, a program comprises one or more software models. Program number codification is as follows:

Unit Ventilator Program Number Unit Type

S = Stand-alone, Open Protocol M = Master/Slave

N = MicroTech Network Software Version (Numeric) Software Version Revision (Alphabetical)

Configuration

2-Pipe Common hot water and chilled water coil 4-Pipe Separate wet heat and chilled water coils

UV 1 S 2 B

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Page 11

Commissioning

Certified Drawing

W ARNING

ELECTRICAL SHOCK HAZARD! Could cause severe injury or death. Failure to bond the frame of this equipment to the

building electrical ground by use of the grounding terminal provided or other acceptable means may result in electrical shock. Service must be performed only by qualified personnel.

The following commissioning procedures pertain to unit ventilators equipped with the MicroT ech Unit V entilator Controller (UVC). These procedures must be performed in addition to the mechanical and electrical system commissioning procedures that are outlined in the model-specific installation literature. Table 5 provides a listing of this literature.

Caution: Before power is applied to any unit, the pre-start procedures in the model-specific installation literature must be closely followed.

Table 5. Model-Specific Unit Ventilator Installation Literature

Unit Ventilator Installation & Maintenance

Model Data Bulletin Number

AE UV-3-204 (IM 502) AZ UV-3-205 (IM 503) AR UV-3-202 (IM 504)

A V/AH UV -3-200 (IM 506)

Pr e-Start

Required Tools and Literature

The following tools and additional literature may be required to properly commission a MicroTech UVC.

Tools:

1. Digital voltmeter

2. Digital ohmmeter

3. Digital thermometer

4. General technician’s tools

5. PC equipped with Monitor software (required for master/ slave and Network UVC, optional for stand-alone UVC’s)

Literature:

1. Model-specific unit ventilator installation bulletin (see T able

2. Program-specific sequence of operation bulletin (see T able 6)

Unit Ventilator Identification

The AAF-McQuay unit ventilators look similar; however, there are significant internal differences which are defined by the model number code string. In addition to the basic heating and cooling equipment, the model number code string specifies which factory-configured options have been provided. These options determine the internal wiring configuration and the field wiring requirements.

Obviously, it is extremely important that the correct unit ventilator be placed in the correct location in accordance with job requirements. Proper unit ventilator location should have been determined during the installation process. Nevertheless, proper location must be verified during the commissioning process.

A large part of the commissioning procedure is ensuring that the unit ventilator operates according to its programmed sequence of operation. The unit ventilator sequences of operation are described in the program-specific literature listed in Table 6.

T able 6. Program-Specific Sequence of Operation Literature

UVC Program Operation Manual Bulletin Number

UV1*** OM 101 UV2*** OM 102 UV3*** OM 103 UV4*** OM 104 UV5*** OM 105 UV6*** OM 106 UV7*** OM 107

Know Y our Unit Ventilator

Before commissioning can proceed, the start-up technician must know which options are supposed to be present on a particular unit ventilator.

1. Check the model number code string against the job requirements. Refer to the unit-specific installation bulletin for a guide to model number nomenclature.

2. Check the program and software model numbers against the unit model number code string. The UVC software must be compatible with the unit ventilator configuration. Refer to the “Software ID” section of this manual.

Note: If a PC is being used for commissioning, check the software ID using the Monitor program. The controller’s program is identified on one of the display screens.

Field Wiring Check

The unit ventilator factory-configured options determine the low voltage field wiring requirements. If a specific option is present on a particular unit ventilator (as denoted by the model number), the associated field wiring (if any) must be checked.

Detailed electrical installation instructions and field wiring diagrams are included in the model-specific installation literature supplied with each unit ventilator. Referring to this literature and using the following check lists, the start-up technician should thoroughly check the electrical installation before the commissioning process proceeds.

Wall Sensor Packages

1. Check that the cable is twisted and shielded.

2. Check that the required number of conductors are available.

3. Check that the shield is grounded in accordance with the installation literature.

IM 613 / Page 11 (Rev. 7/99)

Page 12

4. Check that the conductors have been terminated at the unit and the wall sensor package in accordance with the field wiring diagram.

5. Check that the cable length between the wall sensor package and its UVC does not exceed 250 feet.

6. 460V , Type AE & AZ Only: Check that 600-volt rated cable has been used.

Network Communication (Master/Slave or MicroTech Network Units)

1. Check that the cable is a twisted, shielded pair of conductors.

2. Check that the shield is grounded in accordance with the installation literature.

3. Check that the conductors have been terminated at the units in accordance with the field wiring diagram.

4. At the UVC board, verify that the IDC connectors are disconnected from the Comm A and Comm B ports. (They will be connected during the start-up process.)

5. 460V , Type AE & AZ Only: Check that 600-volt rated cable has been used.

6. MicroTech Network Units Only: Check that the conduc- tors have been terminated at the Local Master Controller (LMC) in accordance with the field wiring diagram supplied with the LMC. Check that the cable length between the LMC and the farthest UVC does not exceed 5000 feet.

Day-Night Changeover (Stand-alone or Master Units)

1. Check that the conductors have been terminated at the unit in accordance with the field wiring diagram.

Note: Field terminations are not required for the factory-mounted

time clock and manual switch options.

2. Check that the ultimate changeover device provides the proper action at the UVC. The dry contacts connected to DI-2 must be “open for occupied” and “closed for unoccupied.” If used, the factory-installed relay is wired so that it must be “de-energized for occupied” and “energized for unoccupied.”

3. 460V, Type AE & AZ Only: Check that 600-volt rated conductors have been used.

Ventilation Lockout (Stand-alone, Master or Slave Units)

1. Check that the conductors have been terminated at the unit in accordance with the field wiring diagram.

2. Check that the field-supplied device energizes the factoryinstalled relay when ventilation lockout is desired.

3. 460V, Type AE & AZ Only: Check that 600-volt rated conductors have been used.

Remote Condensing or Heat Pump Unit (AV/AH Units Only)

Check that the conductors have been terminated at the unit in accordance with the field wiring diagram.

CAUTION

On AH units, it is recommended that the outdoor air temperature sensor be located so that it will accurately sense the outdoor air temperature. If this is not done, improper unit operation or damage to the remote condensing or heat pump unit could occur. The best location for the sensor is either outside the building (shielded from solar radiation) or in the outdoor air ductwork very near the intake.

Setpoint Initialization

Stand-alone and Master/Slave Units

The heating setpoint, unoccupied offset, and minimum OA damper position potentiometers (pots) should be set to the desired settings prior to start-up. For more information, refer to “Setpoint Adjustment Potentiometers” in the “Component Data” section of this manual.

Note: In a master/slave application, the master’s pot

settings define the setpoint values for its slave controllers. If communications fail, the affected slaves read their setpoint values from their own setpoint pots. For this reason, it is recommended that the three on-board setpoint pots on each slave be set so that they match the master’s settings.

Network Units

The three setpoint adjustment potentiometers on a network unit are not operational. The UVC setpoint values are held in memory and can only be modified over the MicroTech network. Initially, before any changes are made over the network, the UVC will use the default, factory-set setpoints shown in Table 7.

Table 7. Network UVC Default Setpoints

Setpoint Value

Occupied Cooling 78°F Occupied Heating 72°F Unoccupied Cooling 88°F Unoccupied Heating 62°F Minimum OA Damper Position 20%

Exhaust Fan Interlock

1. Check that the conductors have been terminated at the unit in accordance with the field wiring diagram.

2. Check that the field-supplied device energizes the factoryinstalled relay when exhaust fan interlock is desired.

3. 460V, Type AE & AZ Only: Check that 600-volt rated conductors have been used.

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Page 13

S tart-Up

Following are UVC start-up procedures for each communication type. The start-up procedure must be performed by a qualified technician for every UVC on a job.

T able 8. Network Communication Port T erminal V oltage Ranges

Communication Acceptable

Port Terminal Voltage Reading

4 (+) 3.0 ± 0.3 VDC

5 (-) 2.0 ± 0.3 VDC

6 (ground) 0.0 ± 0.2 VDC

Stand-alone

Because stand-alone controllers are independent of each other, they may be started in any order.

PC Access

A PC is not required for stand-alone UVC start-up; however, the start-up process will be easier and faster if a PC is used. If a PC is used, it must be equipped with Monitor software. For further information, refer to “PC Connection” in the “Service Information” section of this manual.

Procedure for Each Stand-alone UVC

1. Verify that the main power switch is at “Off.”

2. Verify that the hex switch setting is not “00” or “FF.” These settings are reserved for special applications. For

further information, refer to “Hex Switches” in the “Component Data” section of this manual.

3. Compressorized Units Only (Self-contained or Split System): Set hex switches for random start delay.

Valid settings are between 01 and 3F. For further information, refer to “Random Start” in the “Standard Control Features” section of this manual.

4. Apply power to the unit. Turn the main power switch to “On” and the motor speed

switch to the desired speed, wait 5-minutes until calibration is complete.

5. Check the status LED and operating mode changeover devices. The status LED should illuminate after calibration. If a wall sensor package is used, the remote status LED should also illuminate. Referring to Table 1, verify that the day-night changeover and tenant override options (if present) are working properly. Do this by switching these devices and observing the status LED.

6. Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation (refer to T able 6).

Since the sensed temperatures are fixed at any given moment, adjust the room setpoint and unoccupied offset pots to obtain the expected heating or cooling control actions. If a PC is available, adjust any other applicable parameters to obtain the expected UVC control actions.

7. Check the remote setpoint adjustment pot operation (if present).

Verify that the expected UVC control action occurs when the remote pot is adjusted up or down.

8. Check that the ventilation lockout option works properly (if present).

Certified Drawing

When the unit is in the occupied operating mode, verify that the OA damper closes when the ventilation lockout relay is energized.

9. Check that the exhaust fan interlock option works properly (if present).

Verify that the OA damper opens when the exhaust fan interlock relay is energized.

Master/Slave

Because it provides operating mode and setpoint information to the slaves on its network, the master UVC must be started before any slave. After the master has been started, the slaves may be started in any order. However , if the start-up order follows the daisy chain from the master UVC to successive slaves, it will be easier to detect any wiring problems that may exist in the communications trunk.

T o perform the setup procedures on the next page you must have the Windows Monitor program installed on a PC, the PC must be connected with proper cabling to Port-A on the MicroTech controller, and you must have established communication between the PC and the controller. The cable kit required to properly connect a 9-pin serial PC port to Port-A on a MicroTech controller is P/N 057186802 which will contain cables P/N 067784501 and P/N 067784503.

The DOS Monitor program may also be used to perform these setup procedures.

Points to keep in mind about Master/Slave Units

• Master/Slave controllers must be either all MicroTech 125 or all MicroTech 325; you cannot mix 125’s with 325’s and vice versa.

• Master/Slave networks that have both new and old EOS version MicroTech 325 controllers must use a new EOS controller for the Master (new EOS 325 controllers are labeled 21.169 or 21.A9, all other 325’s are old EOS).

• Master/Slave controllers both use the same program (UV*M**.COD).

• All units are shipped as stand-alone units. Master/Slave code must be downloaded and then Master/Slave configuration performed.

• Slave UVC’s are considered to be independent slaves, this means that Slave UVC’s obtain their setpoints from the Master UVC but the Slave UVC’s then operate based upon their own sensors.

• Port-A on a Master UVC unit will not communicate as you may expect a stand-alone UVC to communicate. If you must connect directly with a Master UVC, you must first set its HEX network address switches to FF then cycle power. The address to use in the Monitor program would then be 00.FF . While the HEX network address switches are set at FF , the Master UVC will not communicate with the Slave UVC’s properly; therefore, you must remember to return the HEX switches to their proper settings, then cycle power when you are done.

IM 613 / Page 13 (Rev. 7/99)

Page 14

• Slave units will communicate as expected when your PC is connected to Port-A, simply make sure you use the correct address for each Slave when using the Monitor program. For example, if the Slave HEX switches are set at 01, then the address you will use in the Monitor program will be 01.01; if the HEX switches are set to 02 on the Slave UVC, then you use 01.02 as the address, etc.

• If you need to communicate with a UVC that is already configured as a Master and is part of an operating Master/Slave network, then use the following method. For example, to calibrate actuators on a Master UVC, connect to Port-A on a Slave unit and set the Controller Address box on the Monitor Read/Write screen to 01.00. This will gain access to the Master controller so that actuator calibration may be performed.

• When a slave UVC loses communication to the Master UVC, the Slave UVC will operate based upon its potentiometer settings (i.e. % Minimum OA Position, etc.) located on the faceplate of the Slave UVC.

Initial Master Configuration

1. Connect the Master UVC’s Port-A to your PC using the proper cables.

2. Adjust the Master UVC’s Hex switches to FF and cycle unit power (auto calibration will occur).

3. Using the Windows Monitor software establish communications with the controller using address 00.FF.

4. In the Windows Monitor program, secure the correct Master/ Slave software, then go to the Support menu and choose Read/Write.

5. On the Read/Write screen, in the Operation box select the Monitor radio button by clicking on it. In the Display box select the Decimal radio button by clicking on it.

6. Enter the following string of memory addresses into the Memory Address box exactly as shown then press the Enter key: 8011-8012,8001-8002,0911,0204.

7. Write a value of 73 to location 8011 by clicking on the current value.

8. Write a value equal to the number of slaves you will have into location 8012 by clicking on the current value of 8012. This value must be 1 through 5 as the minimum number of slaves is 1 and the maximum is 5.

9. Write a value of 0 to location 0911 by clicking on the current value.

10. Write a value of 4 to location 0204 to reset the controller.

11. Change location 8001 to equal location 8002 if there is a difference. If no difference, go to the next step.

12. Change the Master UVC Hex switches to 01.

13. Write a value of 4 to location 0204 to again reset the controller.

14. Master configuration is complete.

15. At this point you will lose communications with the Master UVC through Port-A on the Master. If you need to communicate with the Master UVC, the recommended method is to connect to one of the Slave UVC’s Port-A and set the network address within the Monitor program to 01.00.

Initial Slave Configuration

1. Connect all Slave UVC Port-B’s to the Master UVC’s PortB as shown on the drawings provided with the unit ventilator (these drawings are typically mounted on the inside of one of the unit ventilators removable panels).

2. Connect the Slave UVC’s Port-A to the PC using the proper cables.

3. Using the Windows Monitor software, establish communications with the controller using network addresses 00.FF.

4. In the Windows Monitor program, secure the correct Master/Slave sotware, then go to the Support menu and choose Read/Write.

5. On the Read/Write screen, in the Operation box select the Monitor radio button by clicking on it. In the Display box, select the Decimal radio button by clicking on it.

6. Enter the following string of memory addresses into the Memory Address box exactly as shown, then press the Enter Key: 8011-8012,8001-8002,0911,0204.

7. Write a value of 33 to location 8011 by clicking on the current value.

8. Write a value of 0 to location 8012 by clicking on the current value.

9. Write a value of 1 to location 0911 by clicking on the current value.

10. Write a value of 4 to location 0204 to reset the controller.

11. Change location 8001 to equal 8002 if there is a difference. If no difference, go to the next step.

12. Change the Slave UVC Hex switches to 01 for Slave-1, 02for Slave-2, 03 for Slave-3, etc.

13. Write a value of 4 to location 0204 to again reset the controller.

14. Slave configuration is complete, repeat this process for each Slave.

To Check an Existing Master UVC

1. Verify that the main power switch is at “Off.”

2. Set the network address. For a master UVC, it is recommended that this hex switch

setting be “01”. (This is a “level 2” network address.) For further information, refer to “Hex Switches” in the “Component Data” section of this manual.

3. Apply power to the unit. Turn the main power switch to “On” and the motor speed

switch to desired speed.

4. Check the status LED and operating mode changeover devices.

The status LED should illuminate after calibration. If a wall sensor package is used, the remote status LED should also illuminate.

Referring to Table 1, verify that the day-night changeover and tenant override options (if present) are working properly. Do this by switching these devices and observing the status LED.

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Page 15

5. Check for proper voltage levels at the Comm B port. Use a DC voltmeter to test the voltage levels at the Comm

B terminals with respect to ground. The terminals and acceptable voltage ranges are specified in Table 8.

If the voltage levels are acceptable, connect the IDC connector to the Comm B port.

If no voltage or improper voltage levels are found, the UVC is defective and must be replaced.

6. Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation (refer to Table 6).

7. Check for remote setpoint adjustment pot operation (if present). Verify that the expected UVC control action occurs when the remote pot is adjusted up or down.

8. Check that the ventilation lockout option works properly (if present).

When the unit is in the occupied operating mode, verify that the OA damper closes when the ventilation lockout relay is energized.

Verify that the OA damper opens when the exhaust fan interlock relay is energized.

9. Check that the fan interlock option works properly (if present).

Verify that the OA damper opens when the exhaust fan interlock relay is energized.

To Check Existing Slave UVC

1. Verify that the main power switch is at “Of f.”

2. Set the network address. Each slave must have a unique hex address. Begin by

setting the first slave’s address to “01.” (This is a “level 3” network address.) Address each subsequent Slave in consecutive order (02, 03, 04, 05). For further information, refer to “Hex Switches” in the “Component Data” section of this manual.

3. Apply power to the unit. Turn the main power switch to “On” and the motor speed

switch to desired speed, wait 5 minutes until calibration is complete.

4. Check the status LED. The status LED should illuminate after calibration. If a wall

sensor package is used, the remote status LED should also illuminate.

Verify that the slave’s status LED indication matches the master’s indication, regardless of the operating mode.

If the status LED is flashing in a 16-blink sequence, the slave is not communicating with its master. Refer to “Test Procedures” in the “Service Information” section of this manual.

5. Check for proper voltage levels at the Comm B port. Use a DC voltmeter to test the voltage levels at the Comm B

Certified Drawing

terminals with respect to ground. The terminals and acceptable voltage ranges are specified in Table 8.

If the voltage levels are acceptable, go on to step 6. If no voltage or improper voltage levels are found, the UVC

is defective and must be replaced.

6. Check for proper voltage levels at the communication port IDC connector.

Use a DC voltmeter to test the voltage levels at the connector terminals with respect to ground. Test at the connector terminals corresponding to the communication port terminals listed in Table 8. Verify that the voltages are within the ranges specified in the table.

If the voltage levels are acceptable, connect the IDC connector to the Comm B port.

If no voltage or improper voltage levels are found, verify that the master UVC is energized and that the communications trunk wiring is intact.

7. Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation (refer to Table 6).

Since the sensed temperatures are fixed at any given moment, adjust the UVC heating and cooling setpoints to obtain the expected heating or cooling control actions. This can be accomplished either by adjusting the pots at the master or by disconnecting the communications cable and adjusting the pots at the slave. (If the latter option is chosen, be aware that the status LED will indicate a 16-blink communication failure alarm.)

If a PC is available, adjust any other applicable parameters (at the slave) to obtain the expected UVC control actions.

8. Check that the ventilation lockout option works properly (if present).

When the unit is in the occupied operating mode, verify that the CA damper closes when the ventilation lockout relay is energized.

9. Check that the exhaust fan interlock option works properly (if present).

Verify that the CA damper opens when the exhaust fan interlock relay is energized.

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Page 16

Network

Prior to the start-up of any Network Unit Ventilator Controllers, the following MicroT ech network devices must be commissioned:

• IBM compatible PC with Monitor software

• Network Master Panel

• Local Master Panel (as applicable)

• Loop Water Controller (as applicable) Refer to the literature supplied with these products for information

on installing and commissioning them. After these devices have been properly commissioned, the

network UVC’s may be started in any order. However, if the startup order follows the daisy chain from one UVC to the next, it will be easier to detect any wiring problems that may exist in the communications trunk.

Communications Cable Check

Perform this check for every communications trunk connected to a Network Master Panel (NMP) or Local Master Panel (LMP).

1. Be sure that the communication port IDC connectors are disconnected at every UVC on the trunk.

2. Check that there are no shorts between any two conductors in the communications trunk.

Use an ohmmeter to test for shorts at the communication port IDC connector of the NMP or LMP. (For the three combinations of conductor pairs, there should be infinite resistance between the conductors.) If the conductors are properly terminated, this check will test for shorts throughout the trunk.

Procedure for Each Network UVC

1. Verify that the main power switch is at “Off.”

2. Set the network address. Each UVC on an NMP or LMP trunk must have a unique

hex address. This address should be specified in the job submittal drawings. Refer to the submittal drawings and set the address in accordance with them. (This is a “level 3” network address.) For further information, refer to “Hex Switches” in the “Component Data” section of this manual.

3. Apply power to the unit. Turn the main power switch to “On” and the motor speed

switch to either desired speed, wait 5 minutes until calibration is complete.

4. Check the status LED. The status LED should illuminate after calibration. If a wall

sensor package is used, the remote status LED should also illuminate.

5. Check for proper voltage levels at the Comm B port. Use a DC voltmeter to test the voltage levels at the Comm

B terminals with respect to ground. The terminals and acceptable voltage ranges are specified in Table 8.

If the voltage levels are acceptable, go on to step 6. If no voltage or improper voltage levels are found, the UVC

is defective and must be replaced.

6. Check for proper voltage levels at the communication port IDC connector.

If the voltage levels are acceptable, connect the IDC connector to the Comm B port.

If no voltage or improper voltage levels are found, verify that the NMP or LMP is energized and that the communications trunk wiring is intact.

7. Verify that network communications between the UVC and the NMP have initiated.

At the network PC, change the operating mode to unoccupied and check that the status LED responds accordingly.

8. Verify that the unit ventilator is operating in accordance with its sequence of operation as outlined in the appropriate documentation (refer to Table 6).

Since the sensed temperatures are fixed at any given moment, adjust the UVC heating and cooling setpoints (at the network PC) to obtain the expected heating or cooling control actions.

Adjust any other applicable parameters to obtain the expected UVC control actions.

9. Check that any desired network-executed control features are working properly (ventilation lockout, demand limiting, etc.).

10. Review the submittal drawings and make any necessary changes to the default UVC setpoints and parameters.

11. Check the remote setpoint adjustment pot operation (if present).

Verify that the expected UVC control action occurs when the remote pot is adjusted up or down.

12. Check that the exhaust fan interlock option works properly (if present).

Verify that the OA damper opens when the exhaust fan interlock relay is energized.

IM 613 / Page 16 (Rev. 7/99)

Page 17

PC Access

A PC equipped with Monitor software is required for master or slave UVC start-up. For further information, refer to “PC Connection” in the “Service Information” section of this manual.

Communications Cable Check

1. Be sure that the communication port IDC connectors are disconnected at every UVC on the network.

2. Check that there are no shorts between any two conductors in the communications trunk.

Use an ohmmeter to test for shorts at the communication port IDC connector of the Master UVC. (For the three combinations of conductor pairs, there should be infinite resistance between the conductors.) If the conductors are properly terminated, this check will test for shorts throughout the network.