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Starting the Unit
Heating Mode
(If unit is equipped with electric heater.)
Check to ensure all grilles and registers are
open and all unit access doors are closed be-
fore 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.
Cooling Mode
Verify that the unit airflow rate is adjusted ac-
cording to information provided in "Determin-
ing 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 automati-
cally. There will be a delay of up to 3 minutes
before the unit will start in the cooling mode.
Operating Pressures
After the unit has operated in the cooling
mode for a short period of time, install pres-
sure gauges on the gauge ports of the suction
line valves.
!
NOTE
• Always route refrigerant hoses through
the port hole provided and have com-
pressor access panel in place.
Check the suction and discharge pressures
and compare them to the normal operating
pressures provided in the unit's Service Man-
ual.
!
NOTE
• Do not use pressures to determine the
unit refrigerant charge. The correct
charge is shown on the unit nameplate.
To charge the system accurately, use su-
perheat charging or weigh the charge.
INSTALLATION OF UNIT
Voltage
With the compressor operating, check the line
voltage at the unit. The voltage should be
within the range shown on the unit name-
plate. 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.
27
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