Startup And Checkout - Nordyne S3BM-120G User's Information And Installation Instructions Manual

Grounding
CAUTION:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. This
ground may consist of electrical wire or approved
conduit when installed in accordance with
national or local codes. Do not use gas piping
as an electrical ground!
• This unit must be electrically grounded in accordance
with local codes.
• Proper grounding is accomplished by using the
grounding lug provided in the control box.

STARTUP AND CHECKOUT

CAUTION:
Shut off all electrical power to the unit before
performing any maintenance or service on the
system. Failure to comply may result in personal
injury or death.
Air Filters
Ensure air fi lters are clean and in place prior to operating
the equipment.
Thermostat
Set the room thermostat function switch to OFF, fan
switch to AUTO, and move temperature setpoint to its
highest setting.
Prior to applying electrical power to the outdoor unit, verify
that the unit has been properly and securely grounded,
and that power supply connections have been made at
both the facility power interface and outdoor unit.
Outdoor Unit
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/control
panels are in place. Using extreme caution, apply power
to the unit and inspect the wiring for evidence of open,
shorted, and/or improperly wired circuits.
System Cooling
1. Set the thermostat system switch to COOL and the
fan switch to AUTO.
2. Lower the thermostat temperature switch below room
temperature and verify that the refrigerant pressures
are in order.
NOTE: If refrigerant pressures are abnormal and the
condenser fan is rotating backwards, shut off main
power to the unit and switch any two fi eld wires at the
disconnect. DO NOT alter unit wiring.
3. Listen for any unusual noises. Locate the source and
correct as needed.
4. Allow the unit to run. After several minutes, set the
temperature selector above room temperature.
5. Verify that the fan, blower, and compressor cycle off
with the thermostat.
Short Cycle Protection
1. Set the system in COOLING mode. Note the setpoint
temperature setting of the thermostat, and gradually
raise the setpoint temperature until the outdoor unit
and indoor blower de-energize.
2. Immediately lower the setpoint temperature of the
thermostat to its original setting.
3. Verify that the indoor blower is energized and that the
outdoor unit remains de-energized.
4. Wait 5 minutes and verify the outdoor unit energizes
and that the temperature of the air supplied to the
facility is cooler than ambient temperature.
Heating
1. If equipped with heating equipment, lower the
thermostat setpoint temperature to the lowest
obtainable setting.
2. Set the thermostat function switch to HEATING. The
indoor blower and outdoor unit should stop running.
3. Increase the setpoint temperature of the thermostat
to the maximum setting.
4. Verify that the heating equipment has been energized
(i.e., fossil fuel burner operating, etc.) and that the
indoor blower energizes after a short period of time.
Feel the air being circulated by the indoor blower and
verify that it is warmer than ambient temperature.
5. Listen for any unusual noises. If present, locate and
determine the source of the noise and correct as
necessary.
Indoor Blower
1. Set the thermostat fan switch to ON.
2. Verify that the indoor blower is operating and that
airfl ow is not restricted.
3. Set the fan switch back to AUTO.
WARNING:
If this unit is equipped with crankcase heaters,
Allow 24 hrs for heating of the refrigerant
compressor crankcase prior to start up. Failure to
comply may result in damage or cause premature
failure of the system.
7