McQuay CCH Installation Manual

Operation & Maintenance Data

Group: WSHP Part Number: 910134617 Date: August 2012

OM 931-4

MicroTech® III Unit Controller for Water Source Heat Pump Units

Contents

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

Replacing a MicroTech III circuit board: Initial Power-Up General Use and Information

Occupied Operation Thermostat Inputs (G, Y1, Y2, W1 and W2) Control Inputs (HP, LP, SLTS, COF, U, E, O)

Control Outputs {A and IV/PR (H8)}..................................8

Fan Operation Unoccupied Operation – Stand Alone Thermostat Control

Thermostat Inputs (G, Y1, Y2, W1, and W2) Control Inputs (HP, LP, SLTS, COF, U, E, O)

Control Outputs {A and IV/PR (H8)}..................................9

Additional Operating Modes

High / Low Pressure Faults (HP/LP)

Fan Operation during most Modes, Faults and Shutdowns

Troubleshooting the MicroTech III Unit Controller Troubleshooting the Water Source Heat Pump Unit Microtech® III Unit Controller Interface to External

Equipment Appendix A

Operation and Maintenance of I/O Expansion Module Introduction

Features..........................................................................15

Initial Power up

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Operation

Dual Circuit Units

Thermostat Inputs (Y2, W2)............................................17

Electric Heat Controls

Boilerless Heat Coil Control

Multiple Speed Fan Control

Three-Speed Fan Operations

Circuit Two, Additional Operating Modes

Second Circuit Faults......................................................18

Appendix B

MicroTech III Unit Controller with Communication Module MicroTech III Controller with BACnet® Communication Module

Appendix C – Typical Wiring Diagrams

MicroTech III Unit Controller (Standalone) – 208/230/460/575/60Hz/3-Phase MicroTech III Unit Controller with Optional ECM Motor, Desuperheater and I/O Expansion Module – 208/230/265/277/60 Hz/1-Phase MicroTech III Unit Controller with Optional ECM Motor, Desuperheater, Electric Heat Coil and I/O Expansion Module – 208/230/460/60 Hz/3-Phase MicroTech III Unit Controller with Optional ECM Motor, Desuperheater, and I/O Expansion Module 208/230/460/60/3-Phase MicroTech III Unit Controller with PSC Motor, Desuperheater and I/O Expansion Module for Hot Gas Reheat Control (Unit Sizes 019-070) 208/230/60/1-Phase

Controller Comparison

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LonWorks®

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Introduction

This installation and operation manual covers the MicroTech® III unit controller for Daikin McQuay Water Source Heat Pumps. For information on LonWorks® or BACnet® communication modules and other ancillary components, see:

■ IM 927 - MicroTech III Water Source Heat Pump

LonWorks Communication Module.

■ IM 928 - MicroTech III Water Source Heat Pump Unit

Controller BACnet MS/TP Communication Module.

■ IM 933 - LonWorks Plug-In Software for use with MicroTech III Unitary Controller - LonWorks

Communication Module.

■ IM 952 - Multiple Unit Control Panel (MUCP) for use with MicroTech III Unit Controller and Mark IV Unit

Controller.

■ IM 955 - MicroTech III Water Source Heat Pump Wall-

Mounted Room Temperature Sensors.

■ IM 956 - Temperature Sensors for Units with MicroTech

III Unit Controller and LonWorks Communication

Module.

OM 931-4 / Page 3 of 28

Table 1: MicroTech III Unit Controller Terminals & Descriptions

H1 - 1 24 24 VAC Power Input

H1 - 2 C 24 VAC Common

H2 - 1 SL1 Fan Output - Switched L1

H2 - 2 Blank Terminal

H2 - 3 N Fan Neutral

H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1

H3 -2 HP1-2 High Pressure Switch 1 Input Terminal 2

H4 - 1 Discharge Air Temp Common

H4 - 2 Discharge Air Temp Signal

H4 - 3 Leaving Water Temp Common

H4 - 4 Leaving Water Temp Signal

H5 - 1 1 I/O Expansion Board Common (Gnd)

H5 - 2 I/O Expansion Board Common (Gnd)

H5 - 3 I/O Exp Board +5 VDC

H5 - 4 I/O Expansion Board SPI CE1

H5 - 5 I/O Expansion Board SPI CLK

H5 - 6 I/O Expansion Board SPI OUT

H5 - 7 I/O Expansion Board SPI IN

H5 - 8 I/O Expansion Board +12 VDC

H5 - 9 I/O Expansion Board 24 VAC

H5 - 10 I/O Expansion Board 24 VAC

H5 - 11 Spare

H5 - 12 Spare

H6 - 1 1 Condensate Overow Signal Input

H6 - 2 Low Temp 1 Sensor Common

H6 - 3 Low Temp 1 Sensor Signal

H6 - 4 Low Pressure Switch 1 Source Voltage

H6 - 5 Low Pressure Switch 1 Signal

H6 - 6 Reversing Valve 1 Common

H6 - 7 Reversing Valve 1 Output

H7 - 1 1 Dummy Terminal

H7 - 2 Dummy Terminal

H7 - 3 Red LED Output

H7 - 4 Green LED Output

H7 - 5 Yellow LED Output

H7 - 6 Red-Green-Yellow LED Common

H8 - 1 1 Isolation Valve/Pump Request Relay N/O

H8 - 2 Isolation Valve/Pump Request Relay N/C

H8 - 3 24 VAC Common

H9 - 1 1 Return Air Temperature Signal

H9 - 2 Return Air Temperature Common

TB1 - 1 1 Room Sensor LED Output

TB1 - 2 2 Fan Mode / Heat-Cool-Auto Input

TB1 - 3 3 Setpoint Adjust Input

TB1 - 4 4 Room Temperature Sensor / Tenant Override

TB1 - 5 5 DC Signal Common

Test-1 R 24 VAC

Test-2 W2 Heat Stage 2 Input

Test-3 W1 Heat Stage 1 Input

Test-4 Y2 Cool Stage 2 Input

Test-5 Y1 Cool Stage 1 Input

Test-6 G Fan

TB2 - 1 R 24 VAC

TB2 - 2 A Alarm Output

TB2 - 3 W2 Heat Stage 2 Input

TB2 - 4 W1 Heat Stage 1 Input

TB2 - 5 Y2 Cool Stage 2 Input

TB2 - 6 Y1 Cool Stage 1 Input

TB2 - 7 G Fan Input

TB2 - 8 O Tenant Override Input

TB2 - 9 C 24 VAC Common

TB3 - 1 E Mark IV Emergency Shutdown Input

TB3 - 2 U Mark IV Unoccupied/Occupied Input

L1 - 1 L1 - 1 Line Voltage Terminal 1

L1 - 2 L1 - 2 Line Voltage Terminal 2

L1 - 3 L1 - 3 Line Voltage Terminal 3

N1 N1 Neutral T erminal 1 N2 N2 Neutral T erminal 2

N3 N3 Neutral Terminal 3

Page 4 of 28 / OM 931-4

Figure 1: MicroTech III Unit Controller Terminal Locations

OM 931-4 / Page 5 of 28

CAUTION

Initial Power-Up

The MicroTech III circuit board incorporates static sensitive de-

vices. A static charge from touching the device can damage the electronic components. To help prevent damage during service, use static discharge wrist straps.Static discharge wrist straps are grounded to the heat pump chassis through a 1 Mohm resistor.

Pre start check list:

A random start delay time between 180 and 240 seconds is

generated at power up.

Figure 2: Location of Configuration Jumpers on the Base Board Controller

Replacing a MicroTech III circuit board:

1. Connect wrist strap to unit.

2. Remove faulty board and place on static protected surface.

3. Remove replacement board from static protected bag.

Do not touch circuit board; hold by edges.

4. Holding board in grounded hand, install board in unit.

5. Insert faulty board in empty static bag for return.

Table 2: Configuration Jumper Settings

Jumper Description Options

JP1 Mode

Shorted for service/test operation mode JP2 Fan operation only applies to Open for continuous fan operation network controls Shorted for cycling fan operation

JP3 Freeze protection

Shorted for antifreeze protection JP4 Future spare Future spare JP5 Set point adjustment range only Open for adjustment range of -3.0° to +3.0° F applies to network controls with a Shorted for 50° to 90° F adjustment range

room temperature sensor

JP6 Room control type

Shorted for room temperature sensor control, MicroTech III only

JP7 Future spare Future spare

JP8 Future spare Future spare

Open for normal operation mode

Open for water freeze protection

Open for thermostatic room control

Page 6 of 28 / OM 931-4

General Use and Information

The MicroTech III unit controller is provided with two drive

terminals, R (24VAC), and C (0VAC) that can be used to drive the thermostat inputs (G, Y1, Y2, W1, and W2) and control inputs (U, E and O). Any combination of or single

board drive terminal (R, or C) may be used to operate the Mi-

croTech III’s unit controller or thermostat inputs. Some of the control inputs are used within the Water Source Heat Pump

and not accessible to the end user without a eld service tool (laptop with appropriate software).

Typically the MicroTech III unit controller's R (24VAC)

terminal is used to drive the board’s thermostat inputs and control inputs by connecting it to the R terminal of an industry standard thermostat. The control outputs of the standard thermostat are then connected to the MicroTech III unit controller's thermostat inputs and control inputs as needed.

Any remaining board input(s) may be operated by additional thermostat outputs or remote relays (dry contacts only).

All MicroTech III unit controller inputs must be operated by dry contacts powered by the control board’s power terminals. No solid state devices (Triacs) may be used to operate MicroTech III unit controller inputs. No outside power sources may be used to operate MicroTech III. All units must be properly grounded per local code requirements. See the Installation

and Maintenance bulletin specic to your Water Source Heat

Pump.

Occupied Operation

ellow

The board will be in occupied mode if the unoccupied

terminal (U) is de-energized.

Thermostat Inputs (G, Y1, Y2, W1 and W2)

Thermostat inputs used during occupied operation are G, Y1, and W1, which when energized will activate the Fan Only, Cooling Mode, and Heating Mode respectively. Input W2 and Y2 work the same as W1 and Y2 respectively for single circuit units in occupied mode. For information on W2 and Y2 for dual circuit units, refer to "Dual Circuit Units" on page

17.

Board LED Status – Occupied

Green

Red

The MicroTech III unit controller is congured so that when either the Y1 or W1 input is energized the unit fan is also

activated with Cooling or Heating Modes. In other words,

energizing Y1 and G together will have the same effect as en-

ergizing just Y1. The W1 input has priority over the Y1 input. In situations when both inputs W1 and Y1 become energized (unlikely) in any order the unit will go into the Heating Mode

as described below:

1. If the unit is in Cooling Mode, Y1 is energized. If W1

becomes energized and remains energized, the following

will occur:

• The compressor de-energizes.

• The compressor restarts at 180 seconds (powerup delay timer).

• The reversing valve output energizes within 5 to 20 seconds of the compressor being energized (Heating Mode position), depending on the conguration of jumpers JP7 and JP8.

2. If the unit is in Cooling Mode, Y1 is energized. If W1

becomes energized momentarily, the controller deenergizes the compressor for 180 seconds (shortcycle timer) and then returns to the cooling mode.

3. However, if the unit is in Heating Mode, W1 is energized.

If Y1 becomes energized the unit remains in Heating

Mode.

4. Y2 is the second stage cooling, and applies to dual

compressor units.

Control Inputs (HP, LP, SLTS, COF, U, E, O)

The control inputs are High Pressure (HP), Low Pressure (LP), Suction Line Temperature Sensor (SLTS), Condensate Overow (COF), Unoccupied (U), and Remote Shutdown (E). The control inputs are in normal states during occupied

mode. The state of each control in occupied mode during normal operation is as follows:

• High / Low Pressure (HP, LP): energizes, switch is closed

(no fault).

• Suction Line Temperature Sensor (SLTS): temperature

sensor on the suction line which provides low temperature

protection. Condensate Overow(COF):sensing no condensate water (no fault).

• Unoccupied (U): de-energized (no signal).

• Remote Shutdown (E): de-energized (no signal).

• Tenant Override (O): has no effect in occupied mode.

OM 931-4 / Page 7 of 28

Control Outputs {A and IV/PR (H8)}

The control outputs are Alarm Fault (A) and Isolation Valve / Pump Request {IV/PR (H8)}. The operation of the control

outputs during occupied mode is as follows:

• Alarm Fault (A): energized (no fault).

• Isolation Valve / Pump Request {IV/PR (H8)}: is selectable to be energized when the compressor is off (normally closed), or when the compressor is on (normally open), by moving the wire lead to the appropriate

terminal.

Figure 3: H8 Terminals on MicroTech III Board

Fan Operation

The G terminal controls continuous fan operation. The fan runs continuously when the G terminal is energized. When the G terminal is de-energized, the fan cycles with the compressor.

Cooling Mode

The Y1 terminal controls the Cooling Mode of operation. When the Y1 terminal is energized (24VAC), the following

occurs:

1. The fan energizes.

2. The IV/PR (H8) control output de-energizes or energizes

depending on the H8 terminal wiring (refer to Table 1 on

page 4 & Figure 1 on page 5).

3. The compressor energizes after 30 seconds.

4. If the reversing valve output is energized, the reversing valve out put will be de-energize within 5 to 20 seconds of the compressor being energized, depending on the conguration of jumpers JP7 and JP8.

When the Y1 terminal is de-energized, the following occurs:

1. The compressor de-energizes.

2. The fan de-energizes, unless the G terminal is energized (24VAC).

3. The IV/PR (H8) control output energizes or deenergizes

depending on the H8 terminal wiring (refer to Table 1 on

page 4 & Figure 1 on page 5).

4. The reversing valve output remains de-energized.

Note: To prevent compressor cycling, the required minimum

on/off time default is 180 seconds. This may cause the compressor time delay to be longer than indicated above.

Heating Mode

The W1 terminal controls the occupied Heating Mode of

operation. When the W1 terminal is energized, the following

occurs:

1. The fan energizes

2. The IV/PR (H8) control output de-energizes or energizes

depending on the H8 terminal wiring (refer to Table 1 on

page 4 & Figure 1 on page 5).

3. The compressor energizes after 30 seconds.

4. If the reversing valve output is de-energized, the reversing valve output will be energize within 5 to 20 seconds of the compressor being energized, depending on the conguration of jumpers JP7 and JP8.

When the W1 terminal is de-energized, the following occurs:

1. The compressor de-energizes.

2.The fan de-energizes, unless the G terminal is energized.

3. The IV/PR (H8) control output energizes or deenergizes

depending on H8 terminal wiring (refer to Table 1 on page

4 & Figure 1 on page 5).

4. The reversing valve output remains energized.

Note: To prevent compressor cycling, the required minimum

on/off time default is 180 seconds. This may cause the compressor time delay to be longer than indicated above.

Unoccupied Operation – Stand Alone Thermostat Control

The board will be in unoccupied mode if the unoccupied

terminal (U) is grounded.

ellow

Board LED Status – Unoccupied

Green

Red

Thermostat Inputs (G, Y1, Y2, W1, and W2)

The only thermostat input used during unoccupied operation

is W2, which when energized will activate Heating Mode. Inputs G, Y1, Y2 and W1 have no effect during unoccupied

mode.

Figure 4: Terminal "U" - Grounded for Unoccupied

Page 8 of 28 / OM 931-4

Control Inputs (HP, LP, SLTS, COF, U, E, O)

The control inputs are High Pressure (HP), Low Pressure (LP), Suction Line Temperature Sensor (SLTS), Condensate Overow (COF), Unoccupied (U), and Remote Shutdown (E). The state of each control input during unoccupied mode

during normal operation is as follows:

■ High / Low Pressure (HP, LP): energizes, switch is closed (no fault).

■ Suction Line Temperature Sensor (SLTS): greater than setpoint unit operates (no fault).

■ Condensate Overow (COF): sensing no condensate water (no fault).

■ Unoccupied (U): energizes (signal provided).

■ Remote Shutdown (E): de-energizes (no signal).

■ Tenant Override (O): see "Tenant Override" on page 11.

Control Outputs {A and IV/PR (H8)}

The control outputs provided by the MicroTech III unit

controller are Alarm Fault (A) and Isolation Valve / Pump Request (IV/PR (H8)). The operation of the control outputs

during unoccupied mode is the same as in occupied mode

(see "Occupied Operation" on page 7).

Fan Operation

The G terminal has no effect during unoccupied mode.

Cooling Mode

Cooling operation is not available during unoccupied mode.

Heating Mode

The W2 terminal controls the unoccupied Heating Mode of operation. When the W2 terminal is energized the following

occurs:

1. The fan energizes.

2. The IV/PR (H8) control output energizes or deenergizes depending on H8 terminal wiring (refer to Table 1 on page 4 & Figure 1, page 5).

3. The compressor will start 30 seconds later.

4. If the reversing valve output is de-energized, the reversing valve output will energize within 5 to 20 seconds of the compressor being energized, depending on the conguration of jumpers JP7 and JP8.

When the W2 terminal is de-energized the following occurs:

1. The compressor de-energizes.

2. The IV/PR (H8) control output energizes or deenergizes depending on H8 terminal wiring (refer to Table 1 on page 4 & Figure 1, page 5).

3. The reversing valve remains energized.

Note: To prevent compressor cycling, the required

minimum on/off time default is 180 seconds. This may cause the compressor time delay to be longer than indicated above.

Additional Operating Modes

Brownout

ellow

Brownout condition is provided to protect the water source heat pump’s motor electrical damage due to low voltage conditions.

The MicroTech III unit controller is designed to monitor the

24VAC power supply to the board. If the line voltage supplied to the water source heat pump drops, the 24VAC supply to the

control board will also drop. When the line voltage supplied to the unit drops below approximately 80% of the unit nameplate rated value, the controller goes into brownout condition. The controller remains in brownout condition until line volt-

age returns to approximately 90% of the unit nameplate value.

When in brownout condition, thermostat and control inputs have no affect upon unit operation. No faults or modes have higher priority than a brownout fault condition. Remote shutdown and brownout conditions have the same level of priority. See "Priority of Faults and Modes" on page 12 and

Table 3 on page 12.

When the unit is in brownout condition the following occurs:

1. The compressor de-energizes.

2. The reversing valve de-energizes.

3. The fan de-energizes.

4. Fault terminal (A) de-energizes (fault). A to C will be used

to indicate an alarm signal.

When the line voltage supplied to the unit returns to accept-

able levels (~90% of nameplate) the controller returns to the

current mode.

Remote Shutdown

ellow

Flash

When the E terminal is grounded, the MicroTech III unit

controller enters remote shutdown mode. Remote shutdown is provided so that when properly connected to a building

automation system, remote switch, etc., the E terminal can be

used to shut down the water source heat pump.

Figure 5: Terminal "E" - Grounded for Remote Shutdown

Board LED Status – Brownout

f Flash

Board LED Status – Remote Shutdown

Green

Red

OM 931-4 / Page 9 of 28

+ 19 hidden pages