Installation Manual
17
Installation of Unit
Starting the Unit
(If unit is equipped with electric heater.)
Check to ensure all grilles and registers are open and all unit access doors are closed before
start-up.
Turn on unit main power supply.
Press the E/Heater operation button on the Remote controller.
Set the temperature approximately 5˚C above room temperature.
Verify that the unit airflow rate is adjusted according to information provided in "Determining
Evaporator Fan Adjustment" section of this manual.
To start the unit in the cooling mode, close unit disconnect switch and set the operating mode to
COOL and move the cooling setpoint approximately 5˚C below room temperature. The
condenser fan motor, compressor and evaporator fan motor should operate automatically. There
will be a delay of up to 3 minutes before the unit will start in the cooling mode.
After the unit has operated in the cooling mode for a short period of time, install pressure
gauges on the gauge ports of the discharge and suction line valves.
: Always route refrigerant hoses through the port hole provided and have compressor
access panel in place.
Check the suction and discharge pressures and compare them to the normal operating
pressures provided in the unit's Service Manual.
: Do not use pressures from Service manual to determine the unit refrigerant charge. The
correct charge is shown on the unit nameplate. To charge the system accurately, use
superheat charging or weigh the charge.
With the compressor operating, check the line voltage at the unit. The voltage should be within
the range shown on the unit nameplate. If low voltage is encountered, check the size and length
of the supply line from the main disconnect to the unit. The line may be undersized for the length
of the run.
NOTICE
NOTICE
Operating Pressures
Heating Mode
Cooling Mode
Voltage
WARNING: Bodily injury can result from high voltage electrical
components. If operating checks must be performed with the unit
operating, it is the technician's responsibility to recognize these
hazards and proceed safely. Failure to do so could result in severe
personal injury or death due to electrical shock or contact with moving
parts.
Summary of Contents for 3828A20229B
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