NOTICE
The room temperature must be above 65°F (18°C) for the
compressor to operate in cooling mode on PTAC's with unit-
mounted controllers.
CAUTION
When the unit is first powered up, high humidity conditions
can cause condensation to form on the discharge grill. Keep
doors and windows closed to reduce humidity and condensa-
tion will evaporate.
Heating cycle
—
electric option
Place the thermostat or system switch in the
1.
HEAT
position.
Adjust the thermostat for a warmer temperature until the indoor
2.
fan starts running and the electric heater coil starts emitting
heat.
NOTICE
The outdoor fan does not run during the heating cycle.
After the unit starts running and the space gets warmer, adjust
3.
the thermostat to a cooler temperature until the electric heater
turns off.
If a warmer room temperature is desired, adjust the thermostat to
4.
a warmer temperature setting, which will turn the electric heater
back on.
If a cooler room temperature is desired,
5.
adjust the thermostat
to a cooler temperature setting until the electric heater turns off.
The indoor fan will switch off after the sixty-second purge time
has elapsed.
Place the thermostat or system switch in the
6.
OFF
position.
All operation should stop.
NOTICE
Room temperature must be below 85°F (29.4°C) to energize
the heater on PTAC's with unit-mounted controllers.
Heating cycle — hydronic option
NOTICE
Make sure the motor valve is rated for the correct voltage.
Most RetroAire units with unit mount controls will power a
hydronic valve that is the same voltage as the unit (ex: a unit
rated 208/230v will power a 208/230v). A switch is provided on
the control box to change from NO to NC. Be sure to check the
wiring diagram (located on the unit) and voltage application for
the specific unit. Other valve configurations and voltage options
are available. Consult Technical Service if the unit voltage does
not match your valve application.
Place the
1.
thermostat or system switch in the
HEAT
position.
Adjust the thermostat to a warmer temperature.
2.
The following should then occur:
A signal from the processor board will activate the water or
•
steam valve.
The motorized valve should open and allow hot water or steam
•
to run through the coil.
The indoor fans will run, blowing air through the hydronic coil
•
If the unit is equipped with an Aquastat, the indoor fan and the
motorized damper operation will be delayed until the hydronic
coil reaches 100 ± 5°F (38 ± 3°C).
The signal to the water or steam valve will continue until the room
•
temperature rises above the setpoint by 3°F (2°C).
After the unit starts running and the area gets warmer, adjust the ther-
3.
mostat to a cooler temperature, the hydronic valve will close and indoor
fan will switch off after the sixty-second purge time has elapsed.
If a warmer room temperature is desired,
4.
adjust the thermostat to
a warmer temperature setting, which will open the hydronic valve
and turn on the indoor fan.
If a cooler room temperature is desired, a
5.
djust the thermostat to
a cooler temperature setting. The hydronic valve will again close
and indoor fan will switch off after the sixty-second purge time
has elapsed.
Place the thermostat or system switch in the
6.
OFF
position.
All operation should stop.
NOTICE
Room temperature must be below 85°F (29°C) for the hydronic
heater to operate on PTAC's with unit-mounted controllers.
The hydronic valve is a 24Vac normally open valve. Should power
be interrupted, the valve will default to the open position.
Completion of testing for cooling-only PTAC's
Operation testing is now complete. If
TEST
jumper was set to
test
mode
then make sure to set it back to
normal operation
(see
Figure 11, page 16).
WARNING
Do not leave the unit operating with the TEST jumper in the
TEST position. Prolonged operation with the unit on test mode
will cause damage to the internal components of the unit.
Heat Pump PTHP's
NOTICE
The unit is equipped with a reversing valve that is energized for
cooling and de-energized in heating mode.
Cooling cycle — heat pump units
Place the thermostat or system switch in the
1.
COOL
position.
Adjust the thermostat to a cooler temperature until the indoor
2.
fan
Final Inspection & Start-up
(continued)
Replacement Packaged Terminal Air-Conditioning / Heat Pump
• Installation, Operation, and Maintenance Manual •
The Right Fit for Comfort
18
P/N 240008639, Rev. B [8/16/2011]
