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How many relays are on the central terminal board?
The thermostat reversing valve wire is connected to W1 on commercial heat pumps?
Does DFT1 or DFT2 initiate defrost on 2 circuit commercial heat pumps?
If you replace the central terminal board on a heat pump you must cut Jumpers 5,6,7,
Is the hall effect sensor for draft proving or flame sensing?
It is critical to make sure you have the correct voltage Ignition gas control board when replacing?
Carrier’s HumidiMizer option is for adding humidity inside the building?
The Second 2 digits in the unit’s serial indicate the months the unit was built?
You can adjust the equipment’s airflow with the VFD drive?
VFD Drives do not require any Maintenance?
If the 48/50 JC variable speed compressor is running backwards you switch any 2 legs of the unit’s power supply to reverse rotation?
ECO Blue Axial fan units require the airflow to be field adjusted at start up?
The 10Volts Dc in the Axial fan motor is supplied from the unit’s circuit board?
What is need if a VFD units power supply has a high leg / stinger leg?
You must move the txv bulbs on commercial air handlers to outside the cabinet and mount them on the suction lines?
RTU’s with System Vu can run without a conventional Thermostat?
An external space temperature sensor is required for System Vu units to operate without a conventional thermostat?