McQuay MicroTech 2000 Installation Manual
Installation and Maintenance IM 660-3
Group: WSHP
Part Number: 106018961
Date: May 2005
MicroTech 2000™ Water Source Heat Pump Unit Controller
© 2005 McQuay International
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Component Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Yellow Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Service Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Red Service LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Standard Control Features . . . . . . . . . . . . . . . . . . . . . . . . 3
Compressor Short Cycle Protection . . . . . . . . . . . . . . . . . . . . 3
Random Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Delayed Reversing Valve De-energization . . . . . . . . . . . . . . . 3
Condensate Overflow Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Brownout Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
High Pressure Refrigerant Alarm . . . . . . . . . . . . . . . . . . . . . . 3
Low Temperature Refrigerant Alarm . . . . . . . . . . . . . . . . . . . . 3
Low Pressure Refrigerant Alarm . . . . . . . . . . . . . . . . . . . . . . . 3
Change Filter Notification (network units only) . . . . . . . . . . . . 3
Configurable Relay Outputs . . . . . . . . . . . . . . . . . . . . . . . 4
Boilerless System/Auxiliary Heat Relay (LonWorks only) . . . . 4
Boilerless System/Auxiliary Heat Relay (LonMark only) . . . . . 4
MotorizeD Valve Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fresh Air Damper Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Timed Output Relay (LonWorks only) . . . . . . . . . . . . . . . . . . . 4
Interface Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MicroTech Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wall-Mounted Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Remote Room Set Point Adjustment . . . . . . . . . . . . . . . . . . . . 5
Tenant Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Required tools and literature . . . . . . . . . . . . . . . . . . . . . . 6
Water Source Heat Pump Identification . . . . . . . . . . . . . 6
Field Wiring Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Wall Sensor Packages . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Network Communications Units . . . . . . . . . . . . . . . . . . . 6
Set Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Procedure for WSHP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Description of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unoccupied Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Heating Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Occupied Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Heating Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Holding Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Tenant Override Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Load Shed Mode (LonWorks only) . . . . . . . . . . . . . . . . . . . . . 9
Optimal Start (LonWorks only) . . . . . . . . . . . . . . . . . . . . . . . . . 9
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Diagnostic Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Unit Identification (Wink) Command . . . . . . . . . . . . . . . . . . . 10
Alarm Monitoring and Control . . . . . . . . . . . . . . . . . . . . . . . . 10
Clearing Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Alarm Fault Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
High Pressure Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Low Temperature Fault . . . . . . . . . . . . . . . . . . . . . . . . .10
Low Pressure Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Condensate Overflow Fault . . . . . . . . . . . . . . . . . . . . . . 11
Brownout Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Change Filter Notification (network units only) . . . . . . . . . . . 11
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Input/Output Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Microprocessor Problems . . . . . . . . . . . . . . . . . . . . . . . 12
Power Supply Problems . . . . . . . . . . . . . . . . . . . . . . . . . 12
Erroneous Temperature Readings . . . . . . . . . . . . . . . . . 13
Digital Input Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Brownout Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
WSHP Controller Replacement . . . . . . . . . . . . . . . . . . . 13
McQuay is a registered trademark and MIcroTech 2000 is a trademark of McQuay International.
Copyright © 2005 McQuay International. All rights reserved throughout the world.
Introduction
This manual provides informat ion about the MicroTech 2000™
Water Source Heat Pump (WSHP) controller and control
system used in the McQuay International WSHP product lines.
The manual describes the controller’s components, input/output
configurations, and service procedures.
For network installation or commissioning instructions for
new projects, refer to the protocol information document ED
14954. For general information on a particular WSHP unit,
refer to the model-specific installation manual (see Table 1).
Table 1: Model-specific water source heat pump
installation literature
Document number WSHP unit model
lM 407 Vertical WSHP (007 to 060)
lM 439 Large Vertical WSHP (070 to 290)
IM 447 Console Units WSHP
lM 494 WMH/CWH (007 to 019)
lM 526 Horizontal WSHP (007 to 120)
lM 544 CCH/HWH (006 to 060)*
lM 656 Horizontal WSHP (019 to 060)
IM 742 Enfinity Horizontal WSHP (007 to 060)
IM 778 Enfinity Vertical WSHP (007 to 060)
*50 Hz only
WARNING
Electric shock hazard.
Can cause equipment damage, personal injury, or death.
Properly ground equipment. Connections and service to the
MicroTech WSHP controller control panel must be performed
only by personnel knowledgeable in the operation of the
equipment being controlled.
WARNING
Moisture in the control panel can cause personal injury and
improper equipment operation.
When servicing this equipment during rainy weather or high
humidity conditions, protect the electrical components in the
main control panel.
CAUTION
Temperature hazard. Can cause damage to system
components.
The controller is designed to operate in ambient temperatures
from 32°F to 140°F (O°C to 60°C), and in relative humidity up to
95% (noncondensing). The controller can be stored in ambient
temperatures from 40°F to 176°F (40°C to 80°C), and in relative
humidity up to 95% (noncondensing).
CAUTION
Properly commission (page 6) the water source heat pump
before using for temporary heating or cooling. Failure to
properly commission can cause equipment damage not covered
by warranty.
CAUTION
Static sensitive components. 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 cables, circuit board terminal blocks,
relay modules, or power plugs while power is applied to the
panel.
CAUTION
This equipment generates and uses radio frequency energy. If
not installed and used in accordance with this manual, it can
cause 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. Operation is subject to the
following conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including
interference that may cause undesired operation.
These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in
a commercial environment. Operation of this equipment in a
residential area is likely to cause harmful interference, in which
case users are required to correct the interference at their own
expense. McQuay International disclaims any liability resulting
from any interference or for the correction thereof.
McQuay IM 660-3 1
General Information
The MicroTech 2000™ WSHP unit controller provides control
of McQuay and AAF water source heat pumps. The controller
enables the mode of operation, monitors the water and air
temperatures, and indicates fault conditions. Each unit
controller is factory programmed, wired, and tested for
effective operation of your McQuay WHSP.
The MicroTech 2000 WSHP controller uses LONW
ORKS
®
technology. One of the following two versions of the
application software is loaded into the controller at the factory.
LONMARK® 3.3 certified application code is the current
standard application code for MicroTech 2000 units. Use
L
ONMARK application code in new applications including:
• Units that operate stand alone.
• Units that are integrated into a L
ONWORKS communication
network for communicating with a building automation
system (BAS) of your choice.
For network integration information, refer to the Protocol
Information document ED 15054. Unit controllers with
L
ONMARK application code have a software identification of
WHPE2E or higher.
LonTalk
®
application code was designed prior to
certification. Use this application software only in existing
systems where an existing MicroTech Communications
Gateway (MCG) or MicroTech Comm uni cations Gateway for
Open Protocol (MCGOP) panel is installed. Use LonTalk
application code in existing systems where:
• MicroTech 2000 WSHPs connect to a McQuay MicroTech
monitor through a MicroTech Communication Gateway
(MCG panel).
• MicroTech 2000 WSHPs connect to a third par ty BAS
system through a MicroTech Communications Gateway for
Open Protocol (MCGOP) panel.
If you choose to upgrade your heat pumps, the other
application code can be installed in the field.
Component Data
Microprocessor
The MicroT ech 200 0 WSHP unit co ntroller is a preprogrammed
microprocessor containing the software required to monitor and
control the unit. The controller supports a minimum of six
analog inputs, four digital inputs and five digital outputs
(including the LED). All electrical connections to the board are
provided by three mass termination style headers. Two of the
headers are designated strictly for factory wiring, the other for a
field wiring harness that terminates to a screw-type terminal
strip on the unit’s exterior.
The controller uses set points and fixed preprogrammed
parameters to maintain unit control (many of the set points and
preprogrammed parameters can be adjusted with a PC over the
network).
Yellow Status LED
A yellow , on-b oard status L ED aids in diagnostics by indicating
the water source heat pump operating mode and alarm
conditions. The yellow LED indicates the unit operating mode
as shown in Ta ble2. For more information on alarms, refer to
the “Alarm monitoring and control” section on page 10.
A remote status LED is provided with all optional
wall-mounted temperature sensor packages. It has the same
function as the on-board status LED. If used, the remote LED
connects to the MicroTech WSHP controller at connection #1
on Terminal Board #1.
Table 2: Status LED indication
Status LED status Mode
On continually Occupied, Occupied Load Shed
On 0.5 sec, Off 5.5 sec Unoccupied
On 5.5 sec, Off 0.5 sec Tenant Override, Override Load Shed
On 0.1 sec, Off 0.1 sec Alarm Condition (Condensate Overflow,
Brownout, Compressor Fault)
Service Pin
A service pin (button) is provided that can be used to cause the
Neuron
network containing its unique 48-bit Neuron ID. This ID is
useful during network commissioning. For another method of
forcing the controller to broadcast its Neuron ID, see “Tenant
override” on page 5.
®
chip to broadcast a message over the LONWORKS
Red Service LED
A red on-board service LED provides diagnostics by
indicating the Neuron chip status. The red LED indicates the
Neuron chip status as shown in Table 3 below.
Table 3: Service LED indication
Service LED status Mode
Off continually (Normal) The Neuron has an application
On continually The Neuron does not have an application
Blink slowly The Neuron has an application but is
and is configured.
or is damaged. (Downloading an
application may correct this.)
unconfigured.
Temperature Sensing
The MicroTech 2000 WSHP unit controller uses negative
temperature coefficient (NTC) thermistors for temperature
sensing. A thermistor chart, which provides voltage-totemperature and resistance-to-temperature conversion data, is
included in Table 9 on page 12. The discharge air temperature
sensor is located at the inlet to the fan. The leaving water
temperature sensor is located in the leaving water line.
2 McQuay IM 660-3
Standard Control Features
Standard features of the MicroTech 2000 WSHP control
include:
• Heating and cooling control from a room sensor
• Monitoring of all equipment protection controls
• Fan and compressor operation
• Monitoring of discharge air temperature
• Monitoring of leaving water temperature
• Status of all vital unit functions
• Optional control outputs
Additional standard features of the MicroTech 2000 control are
provided below.
Compressor Short Cycle Protection
When a compressor is energized, it remains energized for at
least 2 minutes before the temperature control sequence is
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 remains de-energized
for at least 5 minutes before the temperature control sequence
is allowed to energize it again.
Random Start
The random start feature prevents simultaneous compressor
startup that could otherwise occur after the following events:
• Unit powerup
• Unoccupied to occupied changeover
• Brownout condition
The compressor start delay can be from 5 to 37 seconds and is
determined by the unique 48-bit Neuron chip ID.
Delayed Reversing Valve De-energization
This feature is provided to delay “swishing.” It prevents the
reversing valve from returning to its normal (cooling) position
for a period of approximately 10 seconds after the compressor
is re-energized when the unit is in the heating mode. If
necessary , an alarm condition can override the delay timer and
de-energize the reversing valve with the compressor.
Brownout Alarm
The on-board brownout feature is meant to protect the
compressor contactors from low voltage or “brownout”
conditions. If the supply voltage to the water source heat
pumps is below 82% of the nameplate value, the WSHP
controller detects it, indicates it, and de-energizes the
compressor. After rectifying the browno ut condition (when
supply voltage remains above 90% of nameplate) normal unit
operation resumes.
High Pressure Refrigerant Alarm
If excessive pressure in the refrigeration circuit is detected by
the high pressure switch, the compressor and reversing valve
de-energizes immediately. If the high pressure alarm
disappears, manually reset the unit controller by disconnecting
and reconnecting power to the unit.
Low Temperature Refrigerant Alarm
Upon detection of a low temperature refrigerant alarm, the unit
controller immediately puts the reversing valve in the cooling
position for 60 seconds. After 60 seconds, the compressor is
disabled. If the low temperature alarm disappears, manually
reset the unit controller by disconnecting and reconnecting
power to the unit. The low temperature alarm occurs only
when the unit is in heating mode.
Low Pressure Refrigerant Alarm
Upon detection of a low pressure refrigerant alarm, the unit
controller immediately disables the compressor. If the low
pressure alarm disappears, manually reset the unit controller
by disconnecting and reconnecting power to the unit.
Change Filter Notification (network units
only)
When the water source heat pump fan run time exceeds a
network-adjustable set point, a change filter notification is
indicated locally and over the MicroTech network.
Condensate Overflow Alarm
If a condensate overflow alarm is detected, the unit controller
immediately disables the compressor . Once the overflow alarm
disappears, the unit controller automatically resets the WSHP
unit. The condensate overflow sensor is an exposed ring
terminal located in the condensate drain pan. The condensate
overflow alarm occurs only when the unit is in cooling mode.
McQuay IM 660-3 3
Configurable Relay Outputs
The MicroTech 2000 WSHP controller provides one relay
output that can be configured for the following four options:
• Boilerless system (skin heat) relay
• Motorized water valve relay
• Fresh air damper relay
• Timed output relay (L
ONWORKS only)
These options can affect installation requirements and unit
control. If more than one configurable relay output option is
required, the MicroTech 2000 WSHP auxiliary board is
required to provide the other three outputs. The MicroTech
2000 WSHP auxiliary board typically is factory mounted only
in 2-compressor-circuit WSHP units. Only three relay outputs
are available for use as configurable relay outputs in 2-circuit
WSHP units. All configurable relay outputs are set to “no
function” by default and must be field configured. A
description of the four relay options follows.
Boilerless System/Auxiliary Heat Relay
(LONWORKS only)
The relay receives loop water temperature input from the
MicroTech Loop Water Controller through the gateway panel
and provides relay output to electric heat on a call for heat
after loop temperature falls.
Boilerless System/Auxiliary Heat Relay
(LONMARK only)
The relay output energizes when the space temperature reaches
the heating set point and de-energizes when the space
temperature exceeds the heating set point plus a configurable
differential set point (defaulted to 3°F).
Motorized Valve Relay
Figure 1: First control signal output
Terminal boards
(located externally on the WSHP chassis)
12345 67
IMPORTANT: To use onboard 24 VAC,
change the jumper PF1 on the
MicroTech 2000 controller
from factory default pins 1 and 2 to
pins 2 and 3.
Figure 2: Second control signal output
Terminal located on
MicroTech 2000 auxilliary board
J6
pilot duty relay
4321
24 VAC
pilot duty relay
(by others)
Use contacts as needed for option.
Figure 3: Third control signal output
Terminal located on
MicroTech 2000 auxilliary board
J7
4321
24 VAC
pilot duty relay
(by others)
EL UPC
24 VAC
(by others)
(by others)
24 VAC24 VAC
(by others)
24 VAC
The relay provides output to the motorized valve to shut off
water through the unit when the compressor is not operating.
Fresh Air Damper Relay
The relay provides output to the open damper whenever the
fan is operating in the occupied cycle.
Timed Output Relay (LONWORKS only)
The relay provides output to an auxiliary load to control its
operation based on a specific time schedule different from that
of the heat pump unit.
4 McQuay IM 660-3
Use contacts as needed for option.
Figure 4: Fourth control signal output
Terminal located on
MicroTech 2000 auxilliary board
J10
4321
24 VAC
pilot duty relay
(by others)
Use contacts as needed for option.
(by others)
24 VAC
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