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

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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