7
Output Alarm Connections
Located on the front panel of the air conditioner is an output alarm connection. Connection to the alarm is not
required for operation of the air conditioner. Each alarm output consists of a dry set of contacts which are to
be user connected to an external alarm system. The contacts are rated 1.0 amp at 30 VAC/DC.
The alarms available are:
Power Failure - White wires in harness. A contact that closes when the supply voltage to the unit
is interrupted.
Component Failure - Black and blue wires in the harness. A contact that opens when the compressor
experiences excessive high or low refrigerant pressures.
24 Volt Output
A source of 24 VAC is available from the red and brown wires located in the output alarm harness.
Harness wire color code:
VII. Pre-Installation Testing
Before mounting the air conditioner to the enclosure, test for proper operation. This will verify the shipping
integrity of the system. Please follow the steps below prior to installation.
CAUTION
1
. The unit must sit in an upright position at a minimum room temperature of 65°F to allow the system to
warm-up. This is particularly important during winter months.
2. Refer to the identification label for proper electrical voltage and current requirements. Connect the
power cord to a properly grounded and fused electrical supply, leaving electrical power to the unit
turned off. Remove rear panel and two electrical box covers.
3
. Note the factory thermostat setting, which is 70°F.
4. Turn the electrical power on.
5. Verify that the evaporator blower is running.
6. Send the cooling request input signal.
7. Verify that the damper is in closed (vertical) position and the compressor is running. The condenser
blower starts to run after 2 or 3 minutes.
The air conditioner must be standing in its proper mounting position for a minimum of five
(5) minutes prior to testing. Failure to follow this procedure will cause permanent damage to
the compressor. To avoid compressor damage do not tip the unit more than 45° from its
proper mounting position.
Function
Wire Color
Power Failure
White and White
Component Failure
Black and Blue
24 VAC Output
Red and Brown
