_ Installation Instructions Single Package Heat Pumps I
9.Operation
Electrical shock hazard.
Turn OFF electric power supply at disconnect
switch or service panel before removing any ac-
cess or service panel from unit.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
Defrost Control Time Interval Adjustment
Electrical shock hazard.
Turn OFF electric power supply at disconnect
switch or service panel before removing any ac-
cess or service panel from unit.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
Features
Scroll Anti-Cycle Timer
All single phase heat pumps with scroll compressors are
equipped with a defrost control board which features an in-
ternal anti-short cycle timer that delays the start of the
compressor in the event of a power interruption. This fea-
ture is to allow pressure equalization throughout the sys-
tem and prevent possible reverse rotation of the scroll
compressor.
To adjust defrost interval:
1.
2.
3.
4.
Turn off all power to Heat Pump.
Remove control box cover.
Locate electronic defrost control board.
The Defrost Control Board has a jumper wire con-
nected from Wl to T1, T2, or T3. To change the time
interval, unplug the jumper wire at T1, T2, or T3
ONLY and connect it to terminal for desired time in-
terval:
T1 = 30 minutes, T2 = 60minutes, T3 = 90 minutes.
Cooling
Thermal ExpansionValves
The evaporator and condenser coil each have a Thermal
Expansion Valve for refrigerant metering. All of the valves
used on evaporator coils have internal check valves for re-
verse flow. The valves on the condenser coils may have
internal or external check valves for reverse flow. There is
also a strainer tube located just in front of each valve for
contaminant protection, along with the system bi-flow dri-
ers.
Adjust thermostat setting to desired temperature and set
thermostat Heat-Cool switch to COOL. The unit will come
on and operate automatically under control of the thermo-
stat. Close all doors and windows. The unit may run contin-
uously for several hours or longer on the initial run because
of residual heat and moisture in the house. This is normal
for any air conditioning system.
CAUTION
Do NOT operate unit on cooling when the outdoor tem-
perature is below 40°F (4.4°C). This is necessary to
prevent possible damage to the compressor.
Loss of Charge Pressure Switch
A low pressure switch on the liquid line (high side) has been
installed to prevent system damage due to a loss of charge.
The switch will open and de-energize the contactor if the
high side pressure drops below the set point of the switch.
Turning The Unit Off
1. Set the thermostat selector switch to OFF and set the
fan switch to AUTO. To restart, set thermostat selec-
tor switch to COOL and set thermostat to tempera-
ture desired.
2. To shut the unit down completely, turn electric power
OFF.
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