Related Manuals for McQuay LDD
Summary of Contents for McQuay LDD
- Page 1 Installation & Maintenance Data IM 439-15 Group: WSHP Part Number: 106581103 Date: June 2006 Large Vertical Water Source Heat Pumps 6 thru 25 Tons Models LDD, LDE, LDL, LDS, LME, LMH, LML, LMS ® ©2006 McQuay International...
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Page 2: Table Of Contents
215 = 215,000 290 = 290,000 etc. . . McQuay Product Identifiers LDD = Std. Large Vertical/DDC Controls/Std. Range/Less Board LME = Std. Large Verical/Mark IV/Ext. Range LDE = Std. Large Vertical/DDC Controls/Ext. Range LMH = High Static Large Vertical/Mark IV/Std. Range LDL = Std. -
Page 3: Transportation And Storage
Unit Location Note: Installation and maintenance are to be performed only by qualified personnel who are familiar with local 1. Locate the unit in an area that allows for easy removal of codes and regulations, and are experienced with this the filter and access panels, and has enough space for type of equipment. -
Page 4: Piping
Figure 2. Side view from piping end Unit Arrangement Two fan discharges and piping arrangements are available. With the return air side defined as the “front” of the unit, the water piping and electrical power connections may be right- hand (side) or left-hand. The main control panel is located in the center of the unit, lower section under the return air filter. - Page 5 Air Balancing 4. Put on belts and adjust belt tension to 4 lbs. ± 0.7 lbs. All units are supplied with a variable pitch motor sheave to aid in airflow adjustment. They are typically set at the low end of (18 ±...
- Page 6 Optional Duct Collar and 2" (51 mm) Ductwork and Attenuation Filter Rack Discharge ductwork is normally used with these conditioners. Return air ductwork may also be required but will require field The optional duct collar kit is used to facilitate connection of installation of a return air duct collar.
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Page 7: Cleaning And Flushing System
Piping 4. Supply and return shutoff valves are required at each con- CAUTION ditioner. The return valve is used for balancing and should have a “memory stop” so that it can always be closed off Do not overtorque fittings. The maximum torque without but can only be reopened to the proper position for the flow damage to fittings is 30 foot pounds. -
Page 8: Start-Up
Cleaning and Flushing System (Continued) 4. Set thermostat to Cool. If the thermostat is an automatic The system should be filled at the city water makeup changeover type, simply set the cooling temperature to connection with all air vents open. After filling, vents should the coolest position. -
Page 9: Operating Limits
Operating Limits Electrical Data Environment General This equipment is designed for indoor installation only. Shel- 1. Be sure the available power is the same voltage and phase tered locations such as attics, garages, etc., generally will as that shown on the unit serial plate. Line and low voltage not provide sufficient protection against extremes in tem- wiring must be done in accordance with local codes or the perature and/or humidity, and equipment performance, reli-... - Page 10 Page 10 of 24 / IM 439...
- Page 11 IM 439 / Page 11 of 24...
- Page 12 Figure 14. Typical MicroTech unit — single compressor Gnd. T2 T3 Mtr. GR/Y Compr. Mtr. Heater LEGEND ( Ext. Rng. Only) Component Wire Connector Thermistor Crankcase Heater Heater Optional Wiring Low pressure Switch High Pressure Switch Low Temperature Switch Reversing Valve Solenoid Compressor Contactor Fan Starter R1 &...
- Page 13 Figure 15. Typical MicroTech unit — dual compressor Gnd Lug L2 L3 T1 T2 T3 Mtr. GR/Y Compr. Mtr. Heater (Ext. Rng. Only) Compr. Mtr. LEGEND Component Heater Wire Connector (Ext. Rng. Only) Thermistor Crankcase Heater Heater Optional Wiring BK/RD 460V OR 230V V1 &...
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Page 14: Unit Operation
Unit Operation General Each unit has a printed circuit board control system. The low units; day heating and cooling operation is locked out. R-W2 voltage output from the low voltage terminal strip on the control energizes the compressor and reversing valve for heating board is always 24 volts DC (direct current). -
Page 15: General Use And Information
LED Status and Fault Output Status Read Outputs Board Status LED’s Fault Output Mode Yellow Green Terminal A Check Timers Occupied Energized Ye s Unoccupied Energized Pres. Sw ? Load Shed Energized Ye s Condensate Overflow De-Energized Brown Out ? High/Low Pressure Fault Flash De-Energized... -
Page 16: Thermostat Connections
Thermostat Connection Diagrams Mark IV/AC Units – Unit Sizes 070 to 121 7-Day Programmable Electronic Thermostat (P/N 107095901) WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit1) O W2 G W1 Y1 F Includes Thermostat and Wall Plate. Refer to the installation, operation & application guide (LIA217) for thermostat 107095901 installation details Non-Programmable Electronic Thermostat (P/N 668054201) - Page 17 Mark IV/AC Units – Unit Sizes 180 to 290 7-Day Programmable Electronic Thermostat – 2 Circuits (P/N 107095901) WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit 1) WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit 2) O W2 G W1 Y1 F O W2 G W1 Y1 F Includes Thermostat and Wall Plate.
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Page 18: Miscellaneous Options On Mark Iv Units
Miscellaneous Options on Mark IV Units Pump Restart Relay Kit P/N 061419001 Used as an option with the Mark IV/AC board, the pump will change state causing a contact closure between terminal restart relay kit provides a means to alert the loop water 58 and 64 signaling the loop water control (LWC) panel to controller that water flow is required by a WSHP so that the restart the loop pump if Off. - Page 19 Motorized Valve & Relay for Large Vertical Units Note: The wiring shown below can only be used when the “P” Wired as shown below the motorized valve will open on a terminal is not being used as a pump restart signal to other equipment. call for compressor operation.
- Page 20 Boilerless System Kit (BSK) P/N 062522204 for sizes 070 - 108 and 121 & P/N 0061251501 for sizes 180, 215 and 290 Wire Ends to be Field Connected to the Mark IV/AC Board WSHP Mark IV/AC Board Low Voltage Terminal Strip Water Temperature 4-pin...
- Page 21 Auxilliary Relay (P/N 03005073) The auxiliary relay is designed to interface external equip- can be used to provide fault signals, unit operation signals, ment with the Mark IV/AC board. The auxiliary relay has been or to provide a means for remote equipment to control the provided with the components necessary to protect from Mark IV/AC board.
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Page 22: Field Installed Options On Microtech Units
Field Installed Options of MicroTech 2000 Units MicroTech 2000 units can provide up to 4-outputs, that can 3rd Control Signal Output be configured for any of the following output control signals: Terminals Located on 1) Scheduled Output MicroTech 2000 Auxiliary Board When using a Network Master Panel (NMP) these outputs can be assigned to one of 32 available schedules. - Page 23 Troubleshooting Water Source Heat Pump WARNING To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s). Power supply to unit must be disconnected when making field connections.
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Page 24: Maintenance
A more critical standard may be desirable. Warranty All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.