FINAL INSPECTION & START-UP
Heat Pump PTHP's
Unit is equipped with reversing valve, energized for cooling
and de-energized in heating mode.
Cooling Cycle — Heat Pump Units
1.
Place thermostat or system switch in
COOL
position.
2.
Adjust thermostat to cooler temperature until indoor
fan starts running. Compressor and outdoor fan will
turn on and cold air begins to flow from the unit. Let
unit continue operating to cool the room and remove
humidity.
3.
After the space gets cooler, adjust thermostat to
warmer temperature until compressor cycles off.
4.
If colder room temperature is desired, adjust
thermostat to cooler temperature setting, turning
compressor and both fans back on.
5.
If warmer room temperature setting is desired, adjust
thermostat to warmer temperature. Cooling mode
ceases and compressor and outdoor fan stop. Indoor
fan will switch off after sixty-second purge time has
elapsed.
6.
Place thermostat or system switch in
OFF
position. All
operation stops.
Heating Operation - Heat Pump Units — Outdoor
Temperature Above 40°F (4°C)
Heat pump units are “Limited Range” equipped with back-
up electric resistance heat. Limited Range heat pumps
are designed to operate when outdoor temperatures are
between 70°F (21°C)and 40°F (4°C) and with maximum
indoor temperature of 85°F (29°C) .
When outdoor temperature falls below approximately 40°F
(4°C) unit will switch from heat pump to electric resistance
heat, or hydronic heat if optionally added.
Electric heat or hydronic heat will then remain as the heat
source until the outdoor temperatures rise above 50°F
(10°C).
RetroAire heat pumps (R_ _H) are single-stage heating
units. Electric heat and heat pump will NOT operate
simultaneously.
Room temperature must be below 85°F (29°C) for
compressor to operate in heating mode on PTHP's with
unit-mounted controllers.
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat to warmer temperature setting until
indoor fan starts running. Compressor and outdoor fan
will turn on and warm air will begin to flow from unit.
3.
After space gets warmer, adjust thermostat to cooler
temperature until compressor cycles off.
4.
For warmer room temperature, adjust thermostat to
warmer temperature setting, turning indoor, outdoor
fans and compressor back on.
5.
If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Heating
mode stops and compressor and outdoor fan stop.
Indoor fan will switch off after sixty-second purge time
has elapsed.
6.
Place thermostat or system switch in
OFF
position. All
operation stops.
Auxiliary Heating Operation — Heat Pump Units —
Outdoor Temperature Below 40°F (4C°) — Electric
Option
Room temperature must be below 85°F(29°C) to energize
heater on PTHP's with unit-mounted controllers.
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat to warmer temperature until indoor
fans start running and electric coil starts emitting heat.
3.
After space gets warmer, adjust thermostat to cooler
temperature until electric heater turns off.
4.
If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which will
turn electric heater back on.
5.
If cooler room temperature is desired, adjust
thermostat to cooler temperature setting until electric
heater turns off. Indoor fan will switch off after sixty-
second purge time has elapsed.
6.
Place thermostat or system switch in
OFF
position.
All operation stops.
Electric Heat Models
Manually reset limit switch if the limit switch opens and
de-energizes the electric heat.
To reset switch:
• Turn power off
• Remove control box cover.
• Locate limit switch.
• Push reset button in, located on the face of the switch.
The Right Fit for Comfort
22
P/N 240010639, Rev. A [06/15/2014
]
