Carrier 50HQP072-120 specifications Typical Ground-Water Piping Installation

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Determine percent voltage imbalance. % Voltage Imbalance = 100 x 4214

= 0.95%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electri- cal components.

NOTE: If more than 2% voltage imbalance is present, contact local electric utility.

EXTERNAL LOOP POWER CONNECTION — If the unit is to be connected to an external loop pump or flow controller, connect the pump to the loop pump terminal block PB1. The maximum power handling is 4 amps at 240 volts. The pumps will automatically cycle as required by the unit.

420-VOLT OPERATION — All 380/420 volt units are factory wired for 380 volts. The transformers may be switched to 420-volt operation (as illustrated on the wiring diagram) by disconnecting the VIO lead at L1 and attaching the BRN lead to L1. Close open end of VIO lead.

Water Automatic

Control Balance Valve

Valve

Boiler

Drains

Pressure-

Temperature

Plugs

Expansion

Tank

Water Out

Water In

From Pump

Shut-Off

Valve

Strainer – Field-Installed Accessory (16 to 20 mesh recommended for filter sediment)

a50-8542

Fig. 11 — Typical Ground-Water Piping Installation

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Contents Safety Considerations ContentsGeneral InstallationPhysical Data 50HQP072-120 Units Unit Dimensions Typical Horizontal Installation Hanger Brackets Install Condensate Piping DrainRemoving Panels Supply/Return Hose Kit Install Field Power Supply WiringTypical Ground-Water Piping Installation Material Water Quality GuidelinesFP1 DPPFP2 HpwrSee legend and notes on LWT SATSPT Electrical Data 50HQP072-120 Dual Point Power Units Electrical Data 50HQP072-120 Standard UnitsLow Voltage VA Ratings Jumper Locations Install Field Control WiringPRE-START-UP Airflow Blower Data 50HQP072Blower Data 50HQP096 Blower Data 50HQP120 Complete C Control Jumper Settings See Fig Deluxe D Control Jumper Settings See FigField Selectable Inputs DIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsAccessory DIP Switch Position Relay Options OADSTART-UP Unit Start-Up in Cooling ModeOperating Limits Start Up SystemUnit Start-Up in Heating Mode Coaxial Water Pressure DropSize Antifreeze Percentages by Volume Approximate Fluid Volume L Per 30 M of PipeOperation Units with Aquazone Complete C ControlAquazone Deluxe D Control LED Indica System TestService Fault DescriptionsComplete C Control LED Code Gravity Flow Method a50-8586 Air Coil Fan Motor Removal Refrigerant ChargingUnit Size Component Drive Package 50HQP Sheave AlignmentThermistor Nominal Resistance TroubleshootingFault Heating Cooling Possible Cause Solution TroubleshootingUnit Does Not Operate Page Copyright 2010 Carrier Corporation II. START-UP START-UP ChecklistCooling Cycle Analysis Heating Cycle Analysis