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4. Remove both the short and the T2 to DFT jumper to
terminate the defrost cycle. The 30 second compressor
delay should operate normally.
5. Test is complete, reset thermostat to home owner
preference.
STARTUP & ADJUSTMENTS
Pre-Start Check List
√ Verify that the unit is level to allow proper condensate
drainage.
√ Verify that the outdoor fan turns freely.
√ Verify that there is free airflow to and from the outdoor
coil and that all clearance requirements are met.
√ Verify that the ductwork is sealed to prevent air leakage.
√ Verify that the power supply branch circuit overcurrent
protection is sized properly.
√ Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
√ Verify that low voltage wires are securely connected to
correct leads in the low voltage area of the control box.
√ 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.
√ Verify that all exterior panels are replaced and securely
fastened.
Startup-Up Procedures
WARNING:
The unit is equipped with crankcase heaters.
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.
• Check unit for return air filters and condensate trap.
• Check all electrical wiring for loose connections and
tighten as required.
• Close all electrical disconnects to energize the system.
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 ductwork. Set thermostat fan switch to Auto the
blower will shut down immediately. NOTE: If blower is
turning opposite of arrow direction, shut off main power to
the unit and switch any two field wires at the disconnect.
DO NOT alter unit wiring.
10
Heat Pump Cooling Operation for 2 Stage
(2 individual refrigerant systems)
1. Set the thermostat system switch to Cool and the
thermostat fan switch to Auto. Lower the thermostat
temperature switch below room temperature and
observe that the blower, both compressors and fan(s)
energize. NOTE: This unit is equipped with a five
minute anti-short cycle timer (ASCT) built in to the
defrost control board for Stage 1 Heat/Cool (Y1). If the
thermostat temperature level is re-adjusted, or if the
system switch is re-positioned, Stage 1 compressor
will not start immediately. Stage 2 Heat/Cool (Y2) has
no ASCT protection and can operate immediately upon
a call from the thermostat. Some thermostats may
also have anti-short cycle protection built in causing a
delay in one or both stages. A protective timer circuit
could hold the compressor(s) off for up to five minutes
following a previous operation or an interruption of the
main power. Consult the operation manual for the type
thermostat being installed.
2. Check that air cooler than room temperature is being
discharged at the register. Ensure unit refrigerant
pressures are in order. Blower should be turning in
direction indicated by arrow. NOTE: If refrigerant
pressures are abnormal and blower is rotating in the
opposite direction of the arrow, shut off main power to
the unit and switch any two field wires at the disconnect.
Ensure proper rotation of both compressors. DO NOT
alter unit wiring. Listen for any unusual noises. Locate
the source and correct as needed.
3. After allowing the unit to run for several minutes, set the
temperature selector above room temperature, verify
that the fan, blower, and compressors cycle off with the
thermostat.
Short Cycle Protection
Following the shut down sequence in the Heat Pump
Cooling Operation Start-Up procedures, immediately
lower the set point temperature of the thermostat slightly
below room temperature and verify that the indoor blower
is energized and after approximately 5 minutes the
compressor and outdoor fans energize.
Heat Pump Heating Operation for 2 or 3
Stage
2 individual refrigerant systems + Electric Heat
(Optional)
1. Set the thermostat system switch to Heat and the
thermostat fan switch to Auto. Raise the thermostat
temperature switch above room temperature and
observe that the outdoor fans, compressor(s), and
indoor blower energize. NOTE: This unit is equipped
with a five minute anti-short cycle timer (ASCT) built in
to the defrost control board for Stage 1 Heat/Cool (Y1).
If the thermostat temperature level is re-adjusted, or if
the system switch is re-positioned, Stage 1 compressor
will not start immediately. Stage 2 Heat/Cool (Y2) has
no ASCT protection and can operate immediately upon
a call from the thermostat. Some thermostats may
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