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Summary of Contents for McQuay MicroTech 2000
- Page 1 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...
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Page 2: Table Of Contents
Procedure for WSHP ......7 McQuay is a registered trademark and MIcroTech 2000 is a trademark of McQuay International. -
Page 3: Introduction
Introduction This manual provides information about the MicroTech 2000™ CAUTION Water Source Heat Pump (WSHP) controller and control system used in the McQuay International WSHP product lines. Temperature hazard. Can cause damage to system components. The manual describes the controller’s components, input/output The controller is designed to operate in ambient temperatures configurations, and service procedures. -
Page 4: General Information
MicroTech Communication Gateway (MCG panel). Red Service LED • MicroTech 2000 WSHPs connect to a third party BAS A red on-board service LED provides diagnostics by system through a MicroTech Communications Gateway for indicating the Neuron chip status. The red LED indicates the Open Protocol (MCGOP) panel. -
Page 5: Standard Control Features
• Status of all vital unit functions • Optional control outputs High Pressure Refrigerant Alarm Additional standard features of the MicroTech 2000 control are If excessive pressure in the refrigeration circuit is detected by provided below. the high pressure switch, the compressor and reversing valve de-energizes immediately. -
Page 6: Configurable Relay Outputs
Configurable Relay Outputs Figure 1: First control signal output The MicroTech 2000 WSHP controller provides one relay output that can be configured for the following four options: Terminal boards (located externally on the WSHP chassis) • Boilerless system (skin heat) relay U P C •... -
Page 7: Interface Features
• Room temperature warning Tenant Override • Filter changes from fan hours A wall-mounted tenant override switch is standard on all McQuay • Compressor management: on/off differential, minimum off MicroTech Room Temperature Sensors. Pressing and holding the time, minimum on time tenant override button for 1.0 to 6.0 seconds puts the unit into... -
Page 8: Commissioning
Check the cable length between the wall sensor package The following tools and additional literature may be required and its water source heat pump controller. (See Table 4 on to properly commission a MicroTech 2000 Water Source Heat page 5.) Pump Controller. -
Page 9: Procedure For Wshp
Load shed start level Off, 1 to 7 Tenant set point adjustment Off (0°F, 0°C) Off, on (3°F to 1.7°C) Low temperature warning 55°F (13°C) 35°F (1.7°C)—high not used High temperature warning 95°F (35°C) 120°F (49°C)—low not used McQuay IM 660-3... -
Page 10: Description Of Operation
UHS set point; however, the controller code prevents the fan from stopping until 12 seconds after the compressor stops. Note – During normal (non-alarm) operation, the compressor is disabled if the stop-to-stop (minimum off) timer has not expired (5 minutes, fixed). McQuay IM 660-3... -
Page 11: Holding Mode
A wall-mounted tenant override switch is available for use controller optimal start logic examines past data to calculate with all MicroTech 2000 WSHP unit controllers. Pressing and the optimal time to change the heat pump from unoccupied to holding the tenant override button for 1.0 to 6.0 seconds puts occupied operation. -
Page 12: Diagnostic Service
• Unit changes to cooling for 60 seconds for coil defrost. • After 60 seconds in cooling, the software immediately de-energizes the compressor and fan. • The software disables normal unit operation until the fault condition is manually corrected. McQuay IM 660-3... -
Page 13: Low Pressure Faults
Brownout Fault The “Brownout” fault indicates the water source heat pump is sensing low voltage levels. It is designed to protect the compressor and contactors from low line voltage or “brownout” conditions. McQuay IM 660-3... -
Page 14: Service Information
0.4 pF and at the steady state AC RMS currents listed in Table 9 (10x single cycle surge currents are assumed on initial turn on). The on-board and off-board status LEDs are controlled by one of the Neuron’s I/0 pins capable of PuIse Width Modulation. McQuay IM 660-3... -
Page 15: Erroneous Temperature Readings
MicroTech unit controller adhesive-backed input circuit. label. This information must be included with the replacement Measure the resistance through the switch contacts (with at WSHP controller part order. least one wire disconnected). The switches normally are closed. McQuay IM 660-3... - Page 16 0.2775 J6-1-7 Auxiliary module connections 1.809 0.2675 1.726 0.2580 1.647 0.2489 1.571 0.2401 1.500 0.2317 1.432 0.2236 1.368 0.2158 1.307 0.2084 1.249 0.2012 1.194 0.1944 1.142 0.1878 1.092 0.1814 1.045 0.1753 1.000 0.1695 0.9572 0.1638 0.9165 0.1584 McQuay IM 660-3...
- Page 17 McQuay IM 660-3...
- Page 18 McQuay IM 660-3...
- Page 20 McQuay Training and Development Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.
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