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© 2005 McQuay International

MicroTech 2000™ Water Source Heat Pump Unit Controller

Installation and Maintenance

IM 660-3

Group:

WSHP

Part Number:

106018961

Date:

May 2005

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Summary of Contents for MicroTech 2000

Page 1: ... 2005 McQuay International MicroTech 2000 Water Source Heat Pump Unit Controller Installation and Maintenance IM 660 3 Group WSHP Part Number 106018961 Date May 2005 ...

Page 2: ...om 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...

Page 3: ...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 c...

Page 4: ... 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 board status LED aids in diagnostics by indicating the water source heat pump op...

Page 5: ...pressor 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 Brownout Alarm The on board brownout feature is meant to protect the compressor contactors from low voltage or brownout conditions I...

Page 6: ... 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 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 cy...

Page 7: ...tional features The wall mounted sensor must be field installed and field wired to the water source heat pump Terminal Board 1 provides the connections for all room temperature sensor field wiring Refer to the unit wiring diagram provided and to IM 529 MicroTech Room Temperature Sensors for information on wall sensor package installation Figure 5 Wall mounted temp sensor wiring Remote Room Set Poi...

Page 8: ...e following check lists thoroughly check the electrical installation Wall Sensor Packages 1 Check that the cable is twisted and shielded with drain wire Belden 8729 or equivalent 2 Check that four conductors are available 3 Check that the conductors are terminated at the unit and at the wall sensor package to screw terminal board 1 in accordance with the field wiring diagram on which terminals are...

Page 9: ... set point 70 F 21 C 35 F to 120 F 1 7 C to 49 C Occupied cooling set point 74 F 23 C 35 F to 120 F 1 7 C to 49 C Fan occupied On On cycle heat cycle cool on Unoccupied heating set point 60 F 16 C 35 F to 120 F 1 7 C to 49 C Unoccupied cooling set point 85 F 29 C 35 F to 120 F 1 7 C to 49 C Fan unoccupied Cycle On cycle Tenant override 1st press 1 00 Off 0 30 to 8 00 Tenant override 2nd press Off ...

Page 10: ...point to a maximum temperature of USHS DIFF The fan also de energizes when the space temperature rises above the 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 Occupied Operating Mode The descri...

Page 11: ... than 10 seconds causes the Neuron chip to broadcast a message over the Lon network containing its unique 48 bit Neuron ID This is useful during network commissioning Load Shed Mode LONWORKS only When the network load shed level is less than or equal to the load shed threshold setting in the unit load shedding is activated The amount the controller adjusts the set points depends upon the network t...

Page 12: ...ate the cause of a manual reset fault before placing the unit back into service Alarm Fault Descriptions Table 6 below describes the alarm faults how they are triggered the factory settings that trigger them and how they are reset A detailed discussion of each follows High Pressure Fault The High Pressure fault indicates that the high pressure switch input J4 9 sensed an open circuit while the con...

Page 13: ...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 The controller is programmed with a brownout set point that corresponds to 82 of the water source heat pump s nameplate line voltage value If the water source heat pump controller senses a voltage level less than its set point for m...

Page 14: ...P controller diagnostics Approximately 40 seconds after power is applied to the WSHP the status LED should illuminate as shown in Table 2 on page 2 If not either there is a software problem or the WSHP controller is defective Power Supply Problems The WSHP controller requires a 24 VAC power supply It is connected to the board at the section labeled 24V GND and 24 VAC terminals J41 and J42 Refer to...

Page 15: ...the digital input circuit 4 Measure the resistance through the switch contacts with at least one wire disconnected The switches normally are closed Brownout Fault The WSHP controller senses the AC voltage at the power input section terminals J41 and J42 see unit wiring diagram If the voltage at these terminals is less than 19 68 VAC for at least 1 second the brownout fault occurs The fault automat...

Page 16: ...mperature sensor common J6 1 7 Auxiliary module connections Table 11 Thermistor chart C 10 k ohm F C 10 k ohm F 18 8 654 0 28 0 8777 82 17 8 173 1 29 0 8408 84 16 7 722 3 30 0 8056 86 15 7 298 5 31 0 7721 88 14 6 900 7 32 0 7402 90 13 6 526 9 33 0 7098 91 12 6 175 10 34 0 6808 93 11 5 845 12 35 0 6531 95 10 5 534 14 36 0 6267 97 9 5 242 16 37 0 6015 99 8 4 967 18 38 0 5774 100 7 4 708 19 39 0 5545...

Page 17: ...McQuay IM 660 3 15 ...

Page 18: ...McQuay IM 660 3 16 ...

Page 19: ......

Page 20: ...pment 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 This document contains the most current product information as of this printing For the most up to date product information please go to www mcquay com ...

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