McQuay MHC Standard Range Installation & Maintenance Data
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McQuay MHC Standard Range Installation & Maintenance Data

McQuay MHC Standard Range Installation & Maintenance Data

Console water source heat pumps r-410a models mhc standard range & mhw geothermal range flat top & slope top – unit sizes 007 – 018
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Console Water Source Heat Pumps
R-410A Models MHC Standard Range & MHW Geothermal Range
Flat Top & Slope Top – Unit Sizes 007 – 018
Slope Top Unit
Installation & Maintenance Data
Flat Top Unit
©2010 McQuay International
IM 985-1
Group: WSHP
Part Number: 669544301
Date: January 2010
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  • Page 1 Group: WSHP Part Number: 669544301 Date: January 2010 Console Water Source Heat Pumps R-410A Models MHC Standard Range & MHW Geothermal Range Flat Top & Slope Top – Unit Sizes 007 – 018 Slope Top Unit Flat Top Unit ®...

  • Page 2: Table Of Contents

    J = 265/60/1 WARNING This Installation and Maintenance bulletin is intended to provide the proper procedures for installing a McQuay Console Water Source Heat Pump. Failure to follow these procedures can cause property damage, severe personal injury or death. Additional, failure to follow these procedures can cause premature failure of this equipment or cause erratic unit operation, resulting in diminished unit performance.

  • Page 3: Receiving And Storage

    Pre-Installation Receiving and Storage Upon­receipt­of­the­equipment,­check­carton­for­visible­ WARNING damage .­Make­a­notation­on­the­shipper’s­delivery­ The installer must determine and follow all applicable ticket­before­signing .­If­there­is­any­evidence­of­rough­ codes and regulations. This equipment presents hazards handling,­immediately­open­the­cartons­to­check­for­ of electricity, rotating parts, sharp edges, heat and weight. concealed­damage .­If­any­damage­is­found,­notify­the­ Failure to read and follow these instructions can result in carrier­within­48­hours­to­establish­your­claim­and­...

  • Page 4: Unit­installation

    Unit Installation (Recommended) Note: If using the Alternate Unit Installation procedure (Using Mounting Brackets, page 6) it is not necessary WARNING to remove the top section. Continue with step 5 if using the recommended method of installation. Installation and maintenance are to be performed by qualified personnel who are familiar with local codes and 5 .­...
  • Page 5 90 degrees to the wall as a Toggle bolt or equivalent (by others) (see letter F shown in Figure 2. McQuay recommends the placement of a sound absorbing in Figure 2). mat beneath the unit footprint before continuing to the next installation step.
  • Page 6 Figure 2, page 5 drywall anchors can be utilized when studs are McQuay recommends the placement of a sound absorbing absent at bracket locations. It is the responsibility of mat beneath the unit footprint before continuing to the next the installing contractor to provide the appropriate installation step.

  • Page 7: Piping

    Piping Note: Be sure that one end of the hose has a swivel fitting to facilitate removal for service. Hard piping to 1 .­ Connect­units­to­supply­and­return­piping­in­a­two- the unit can result in added operating noise. pipe reverse return configuration (Figure 4). ­ A­reverse­return­system­is­inherently­self-balancing­ 4. If sealant compound is not provided for flexible hose and­requires­only­trim­balancing­where­multiple­ fittings, apply Teflon tape to the connections to help quantities of units with different flow and pressure prevent­leaks .

  • Page 8: Water Connections

    8 .­ Units­are­internally­trapped .­Copper­or­PVC­ Shutoff/Balancing Valve Piping condensate­lines­can­be­used .­A­means­of­ Each­heat­pump­requires­a­shutoff­valve­on­both­the­ disconnection­must­be­furnished­to­facilitate­chassis­ supply­and­return­lines­for­easy­serviceability­and­ removal . removal­if­it­becomes­necessary . 9 .­ No­point­of­the­drain­system­may­be­above­the­drain We­suggest­using­our­combination­shutoff/balancing ­ pan­of­any­unit . valves installed in the field between the contractor’s 10. Automatic flow control devices must not be installed piping­and­the­heat­pump­unit .­The­valve­installed­on­ prior to system cleaning and flushing. the­return­line­acts­as­a­balancing­valve­to­adjust­the­ proper water flow. An automatic flow limiting device is 11 .­A­high­point­of­the­piping­system­must­be­vented . also­available­as­a­factory­installed­option . Each shutoff/balancing valve has 1/2" FPT and 1/2" 12 .­Check­local­code­for­any­requirement­for­electric­ fittings. FPT­threaded­connections . Water Connections Attach the field installed combination shut/off balancing valve­to­the­building­water­supply­and­return­piping .­...
  • Page 9 Note: On left hand piping units, the water supply connection is at the top location. On right-hand piping units, the water supply connection is at the Note: McQuay International offers a wide variety of bottom location. piping packages. Consult your local sales rep for more information.
  • Page 10 Motorized Isolation Valve Note: Connectors on valve must be cut off and stripped back and the wires twisted to make The­2-way­motorized­valve­kit­is­available­as­a­factory- connections to the H8 (IV/PR) terminals on the installed and wired option or may be ordered as a field- MicroTech III controller. installed­accessory . Note: All plumbing connections are made the same, Wired­as­shown­in­Figure­8,­the­motorized­valve­will­open­...

  • Page 11: Cleaning & Flushing Water System

    . Figure 9. Connections for flushing system piping NOTICE It is McQuay International’s policy not to make recom- mendations on water treatment. It is the responsibility of Return Runout the user to check that the water supply to the units is free of contaminants or corrosive agents, chemicals or miner- als.

  • Page 12: Electrical Connections

    Electrical Connections Note:­If electrical wiring or conduit comes through the floor, all wires or conduit should be sealed at Note: Installation and maintenance must be this point. It will prevent any condensation or water performed only by qualified personnel who are leakage that may occur due to lack of preventive familiar with local codes and regulations, and are maintenance.

  • Page 13: Mechanical­(Compressor)­Heating­override­to

    Mechanical (Compressor) Heating Override Table 3. Electric Heater Current and Power to Electric Heat Operation Sizes 007, 009, 012 Sizes 015, 018 2.5kW 3.5kW Nominal Voltage Power (kW) Current (Avg) Power (kW) Current (Avg) Note: Only with units equipped with the electric 2.01 9.67 2.71...

  • Page 14: Microtech­iii­unit­controller

    The­24­volt­low­voltage­terminal­strip­is­set­up­so­R-G­ Table 4. Air Limits energizes­the­fan,­R-Y1­energizes­the­compressor­for­ Standard Range Geothermal Range Units Units cooling­operation,­R-W1­energizes­the­compressor­and­ Cooling Heating Cooling Heating reversing­valve­for­heating­operation .­The­reversing­ Min. Ambient Air 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C 40˚F/5˚C valve­is­energized­in­the­heating­mode .­The­circuit­ Normal Ambient Air 80˚F/27˚C 70˚F/21˚C 80˚F/27˚C 70˚F/21˚C board­has­a­fan­interlock­circuit­to­energize­the­fan­ Max. Ambient Air 100˚F/38˚C 85˚F/29˚C 100˚F/38˚C 85˚F/29˚C 50˚F/10˚C 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C Min.

  • Page 15: I/O Expansion Module

    Shorted for dual compressor Hot Gas/ Open to disable reheat Water Reheat Shorted to enable reheat JP3 and JP4 open for no supplemental heat This­manual­covers­the­installation­of­a­McQuay­ Supplemental JP3 open, JP4 shorted for Console­Unit­-­Model­MHC,­MHW­Water­Source­ & JP4 Heat Type boilerless electric heat Heat­Pump .­For­installation­and­operation­information­...
  • Page 16 MicroTech III Unit Controller with L ® orks Communication Module orks MicroTech­III­Unit­Controller­with­L This­manual­covers­the­installation­of­a­McQuay­ Communication­Module­orchestrates­the­following­unit­ Console­Water­Source­Heat­Pump .­For­installation­and­ orks operations: operation­information­on­L ­Communication­ Module­and­other­ancillary­control­components,­see: ­ Enable­heating­and­cooling­to­maintain­setpoint­ •­­ IM­927­-­MicroTech­III­Unit­Controller­for­Water­ based­on­a­room­sensor orks Source­Heat­Pumps­(L ­ Enable­fan­and­compressor­operation •­ IM­933­-­LonMaker­Integration­Plug-in­Tool:­For­ ­ Monitors­all­equipment­protection­controls use­with­the­MicroTech­III­Unit­Controller . ­ Monitors­room­and­discharge­air­temperatures •­ IM­955­-­MicroTech­III­Wall­Sensor­For­use­with­...

  • Page 17: Microtech­iii­controller­with­bacnet­module

    Communication Module For­installation­and­operation­information­on­MicroTech­ Figure 14. MicroTech III BACnet Water Source Heat Pump Snap-in Communication Module III­unit­controller­and­other­ancillary­components,­see: •­­ IM­928­-­MicroTech­III­BACnet­Communication­ Module •­­ OM­931­-­MicroTech­III­Unit­Controller­for­Water­ Source­Heat­Pumps­Operation­and­Maintenance­ Manual •­ IM­955­-­MicroTech­III­Wall­Sensor­For­use­with­ Microtech­III­Unit­Controller McQuay­water­source­heat­pumps­are­available­with­ McQuay­BACnet­communication­module­The­module­ MicroTech­III­Unit­Controller­with­BACnet is­programmed­and­tested­with­all­the­logic­required­to­ Communication­Module­orchestrates­the­following­unit­ control­the­unit,­and­is­designed­to­communicate­over­a­ operations: BACnet­MS/TP­communications­network­to­a­building­ automation system (BAS). It can be factory or field- ­ Enable­heating­and­cooling­to­maintain­setpoint­ installed .­ based­on­a­room­sensor ­...
  • Page 18 MicroTech® III Unit Controller Terminals Locations and Descriptions H7 - 6 Red-Green-Yellow LED Common H1 - 1 24 VAC Power Input H8 - 1 Isolation Valve/Pump Request Relay N/O H1 - 2 24 VAC Common H2 - 1 Fan Output - Switched L1 H8 - 2 Isolation Valve/Pump Request Relay N/C H8 - 3...

  • Page 19: Microtech­iii­unit­controller­terminal­locations

    Location of Configuration Jumpers on the MicroTech III Note: A random start delay time between 180 and Unit Controller 240 seconds is generated at power up. Figure 15. MicroTech III Unit Controller Terminal Locations IM 985-1 / Page 19 of 36...

  • Page 20: Communication­module­placement

    orks Figure 16. L Communication Module Placement on MicroTech III Unit Controller Page 20 of 36 / IM 985-1...
  • Page 21 Typical Wiring Diagrams MicroTech III Unit Controller for Sizes 007-015 – 208/230/60Hz/1-Phase Drawing No. 669539003A Note: Wiring diagrams are typical. For the latest drawing version refer to the wiring diagram located on the inside of the controls access panel of the unit. IM 985-1 / Page 21 of 36...

  • Page 22: Typical­wiring­diagrams

    Typical Wiring Diagrams MicroTech III Unit Controller With Electric Heat for Size 018 208/230/60Hz/1-Phase Drawing No. 669539006A Note: Wiring diagrams are typical. For the latest drawing version refer to the wiring diagram located on the inside of the controls access panel of the unit. Page 22 of 36 / IM 985-1...
  • Page 23 Typical Wiring Diagrams MicroTech III Unit Controller with Communication Module and Wall-Mounted Room Temperature Sensor 265/277/60Hz/1-Phase Drawing No. 669542001 CAUTION When the optional wall-mounted room temperature sen- sor is connected to the unit controller, the Return Air Temperature (RAT) sensor must not be installed. The wall- mounted room temperature sensor and return air sensor must not be connected simultaneously or the unit will not operate properly.

  • Page 24: Start-Up

    Start-up Table 10. LED Fault Indicators Fault LEDs Output CAUTION Indication Yellow Green Normal Mode Units must be checked for water leaks upon initial water High Pressure Fault Flash system start-up. Water leaks may be a result of mishan- Low Temperature Fault* Flash dling or damage during shipping.
  • Page 25 Specifications–668810301 Specifications–668811201 Electrical rating:­•­24­VAC­(18-30­VAC) Electrical rating:­•­24­VAC­(18-30­VAC) ­ ­ •­1­amp­maximum­per­terminal ­ ­ •­1­amp­maximum­per­terminal ­ ­ •­3­amp­maximum­total­load ­ ­ •­3­amp­maximum­total­load Temperature control range:­45°F­to­90°F­(7°C­to­ Temperature control range:­45°F­to­90°F­(7°C­to­ 32°C)­Accuracy:­±­1°F­(±­0 .5°C) 32°C)­Accuracy:­±­1°F­(±­0 .5°C) System configurations:­1-stage­heat,­1-stage­cool,­heat­ System configurations:­1-stage­heat,­1-stage­cool,­heat­ pump pump Timing:­Anti-short­Cycle:­4­minutes Timing:­Anti-short­Cycle:­4­minutes­­ ­ Backlight­Operation ­ Backlight­Operation Terminations:­S1,­S2,­Y,­W/O/B,­G2,­G1,­RC,­RH,­C Terminations:­S1,­S2,­Y,­W/O/B,­G2,­G1,­RC,­RH,­C For­detailed­installation,­operation­and­application­refer­...
  • Page 26 Programmable Electronic Thermostat Non-Programmable Electronic Thermostat (P/N 668811101) (P/N 668811001) 7-Day Programmable, Auto Changeover, Fan Speed Non-Programmable, Auto Changeover, Fan Speed Control, Hardwired Control, Hardwired •­ 7-Day­Programmable •­ Single­Stage­Heat­Pump/Non-Heat­Pump­Systems •­ Single­Stage­Heat­Pump/Non-Heat­Pump­Systems •­ Backlit­Display •­ Backlit­Display •­ Single­Stage­Heat/Cool­Systems •­ Single­Stage­Heat/Cool­Systems •­ Field­Calibration •­...
  • Page 27 •­­ Mounts­in­any­suitable­location­that­will­provide­­ interfere­with,­or­be­affected­by,­any­other­thermostat­ good­temperature­control .­ or­RCN­in­adjacent­rooms,­apartments,­or­neighboring­ •­­ Large­LCD­display­provides­the­user­with­ homes . current­room­temperature,­set­point­temperature,­ time,­program­interval,­and­other­system­status­ Remote Control Node (RCN) information . Used­with­the­Wireless­Temperature­Control,­the­ RCN interfaces with specific HVAC equipment, and For­detailed­installation,­operation­refer­to­Operation­&­ Maintenance­Bulletin­OM­897 . communicates­with­its­thermostat­using­unlicensed­ 900­MHz,­radio­frequency­energy .­Contact­your­local­ McQuay­Representative­for­details . Programmable Non-programmable Figure 19. T9000 Overview IM 985-1 / Page 27 of 36...
  • Page 28 MicroTech III Wall-Mounted Room Temperature Sensors Specifications (Kit P/N 669529101, 669529201, 669529001) Thermistor resistance (10kΩ) (Conforms­to­advance­thermal­products­curve­2) Figure 20. MicroTech III Wall-Mounted Room Temperature Sensors (669529201 Not Shown) Ambient­Temperature­Limits: Shipping­and­Storage:­40°F­to­160°F­(–40°C­to­71°C) Operating:­40°F­to­140°F­(4°C­to­60°C) Humidity:­5­to­95%­RH,­non-condensing Locations:­NEMA­Type­1,­Indoor­only Connections:­Color­Coded­Leads Wiring Sensors to the MicroTech III Unit Controller Sensor 669529101 Sensor 669529001 Sensor 669529201 Not Shown Figure 22.

  • Page 29: Pump­restart­kit

    Optional Remote Sensor (P/N 66720401) Note: Connectors on valve must be cut off and stripped back and the wires twisted to make The fast, easy solution for temperature sensing problems. connections to the IV/PR Terminals • For tamper prone areas Pump Restart Relay Kit P/N 061419001 •...

  • Page 30: Outside­air­dampers

    Outside Air Damper – Field-installed Option Cold Weather Operation Console­water­source­heat­pumps­may­experience erratic­operation­during­cold­ambient­conditions­with­ CAUTION the­outside­air­damper­in­the­open­position .­See To prevent infiltration of ambient conditions, it is the “Operating­Limits,”­pages­13­and­14,­for­guidelines . responsibility of the contractor to assure that factory installed gasketing matches up with the wall opening, or that additional material is used to assure a positive seal.

  • Page 31: Troubleshooting

    The in and outs of R-410A values printed below are to be taken as suggested pressure and temperatures. All McQuay water R-410A­is­a­non-ozone­depleting­blend­of­two­ source heat pumps are designed for commercial refrigerants - HFC-125 and HFC-32 in a fifty percent use.

  • Page 32: Troubleshooting Refrigeration Circuit

    Troubleshooting Refrigeration Circuit Water Safety Head Suction Compressor Super Temp (loops) Temp Lock Subcooling Pressure Pressure Amp Draw Heat Symptom Differential Differential Charge Undercharge System High Low Pressure (Possible Leak) Normal Overcharge System High High High Normal High Normal High Pressure High Low Air Flow Heating High...

  • Page 33: Cooling­refrigeration­circuit

    Typical Cooling and Heating Refrigeration Cycles Figure 26. Cooling Mode Return Air Thermal Coaxial Heat Expansion Valve Exchanger Water In Coil – Air to Refrigerant Water Out Heat Exchanger Sensing Bulb and Capillary Tube Compressor Blower Reversing Valve Conditioned Air (Cooling) Cooling Refrigeration Cycle When the wall thermostat is calling for COOLING, the reversing valve directs the flow of the refrigerant, a hot gas,...

  • Page 34: Troubleshooting­the­wshp­unit­operation

    Troubleshooting the Water Source Heat Pump Unit Figure 28. Troubleshooting Guide - Unit Operation Unit control, check thermostat Low voltage, check Fuse may be blown, Wire may be loose or broken. for correct wiring or faulty power supply voltage circuit breaker is open Replace or tighten wires thermostat Check wiring - loose or...

  • Page 35: Troubleshooting­the­microtech­iii­unit­controller

    Troubleshooting the MicroTech III Figure 29. MicroTech III Unit Controller LED Status and Faults Troubleshooting Reference Unit Controller DANGER Read Outputs To avoid electrical shock, personal injury or death, be Check Timers sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is Brownout within the limits shown in the job-specific drawings and...
  • Page 36 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.

This manual is also suitable for:

Mhw geothermal ranMhc seriesMhw seriesWmhc seriesWmhw series

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