XR Series Heat Pump Condenser Quiz

A forced defrost test can be performed by shorting the open-close test pins on the EVC board

You must have a W call from the thermostat to initiate a call for compressor heating on a heat pump system

When calculating supplemental heat requirements for a heat pump system, 1 Watt equals 3.412 BTU’s is important for you to know

What is the X1, black low voltage wire on the defrost control board, used for on a heat pump condensing unit?

To initiate defrost on a heat pump condensing unit
To initiate the crankcase heater on the compressor
To activate the solenoid on the reversing valve
To initiate the call for supplemental heat in the Air Handler during a defrost cycle

What is required for normal operation on a Defrost Control board?

Status LED on board flashing 1 time/second in standby or 2 times/second with a call for heating or cooling
24 VAC between R & B
24 VAC between Y & B and Y0 & B with unit operating
Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin
All the above

When installing the heat pump condenser, it is important to keep the side panel to the left of the service ports fully accessible for what reason?

Sending 24 VAC to the reversing valve is necessary when calling for which operation?

On a two-stage heat pump condenser, you must have an active call on Y1 and Y2 at the same time to initiate second stage operation

When should you braze using a nitrogen purge?

When checking the charge in heating mode, you must connect your hoses to which ports?

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