Start Up And System Check; Unit Maintenance - Nordyne 460/575 Volt Single Package Convertible Air Conditioner User Manual And Installation Instructions

4. Secure sub base or thermostat to the
wall using screws provided with the
thermostat.
5. If sub base is used, install the correct
thermostat housing to sub base.
6. Refer to thermostat instruction sheet
for complete detailed mounting
information.

START UP AND SYSTEM CHECK

Pre-Start Check List
• Verify that the unit is level to allow proper
condensate drainage.
• Verify that there is free airflow to and from
the outdoor coil and that all clearance
requirements are met.
• Verify that the duct work is sealed to
prevent air leakage.
• Verify that the line voltage power leads
are securely connected and the unit is
properly grounded.
• Verify that the low voltage wires are
securely connected to the correct leads
on the low voltage terminal strip.
• Verify that all exterior panels are replaced
and securely fastened.
• Verify that the outdoor fan turns freely.
• Verify that the power supply branch circuit
overcurrent protection is sized properly.
• Verify that the thermostat is wired
correctly. The thermostat function switch
should be set to "Off' and the thermostat
fan switch should be set to "Auto."
Start-Up Procedure
Close all electrical disconnects to energize
the system.
! WARNING:
If the unit is equipped with a crankcase
heater, allow 24 hours prior to continuing
the start up procedures to allow for
heating of the refrigerant compressor
crankcase. Failure to comply may result
in damage and could cause premature
failure of the system. This warning should
be followed at initial start up and any time
the power has been removed for 12 hours
or longer.
10
Air Circulation — Leave the thermostat system
switch set to "Off" and set the thermostat fan
switch to "On." The blower motor should run
continuously. Check for air delivery at the
register(s). Ensure that there are no obstructions
at the registers or in the duct work. Set thermostat
fan switch to "Auto."
Short Cycle Protection (Single Phase Units)
— With the system operating in cooling mode,
note the temperature setting of the thermostat
raise the set-point
and gradually
until the unit de-energizes. Immediately lower
the set point temperature of the thermostat to its
original setting and verify that the indoor blower
is energized. Verify that after approximately 5
minutes the compressor and fan energize and
that the temperature of the discharge air is
cooler than the room temperature.
System Cooling
1. Set the thermostat system switch to
"Cool" and the thermostat fan switch to
"Auto." Gradually lower the thermostat
temperature switch below room tem-
perature and observe that the blower,
compressor, and fan energize. Check
that air cooler than room temperature
is being discharged at the register.
Listen for any unusual noises. Locate
the source and correct as needed.
2. After allowing the unit to run for several
minutes, set the temperature selector
above room temperature.
- The fan and compressor cycles
off with the thermostat.
- The blower should also stop
unless fan switch is set to "ON"
position.

UNIT MAINTENANCE

! WARNING:
To avoid risk of electrical shock, personal
injury, or death, disconnect all electrical
power to the unit before performing any
maintenance or service. The unit may
have more than one electrical supply.
Refrigerant Charging — Packaged air
conditioners are fully charged at the factory.
The system refrigerant charge can be checked
and adjusted through the service ports provided
temperature