Heating Cycle — Electric Option
1.
Outdoor fan does not run during heating cycle.
2.
Place thermostat or system switch in
HEAT
position.
3.
Adjust thermostat for warmer temperature until
indoor fan starts running and electric heater coil starts
emitting heat.
4.
After unit starts running and space gets warmer,
adjust thermostat to cooler temperature until electric
heater turns off.
5.
If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which will
turn electric heater on.
6.
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.
7.
Place thermostat or system switch in
OFF
position. All
operation will stop.
Heating Cycle — Hydronic Option
Before Starting The unit:
• Verify motor valve is rated for 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).
• Switch is provided on control box to change from NO
to NC.
• Verify wiring using 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 unit voltage does
not match your valve application.
Starting the unit:
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat to warmer temperature.
3.
A signal from processor board will activate the water or
steam valve.
4.
The motorized valve will open and allow hot water or
steam to run through the coil.
5.
Indoor fans run, blowing air through the hydronic coil
6.
If the unit is equipped with an Aquastat, the indoor fan
and motorized damper operation are delayed until the
hydronic coil reaches 100 ± 5°F (38 ± 3°C).
7.
The signal to water or steam valve continues until
room temperature rises above setpoint by 3°F (2°C).
8.
Once the area gets warmer, adjust thermostat to a
cooler temperature. The hydronic valve closes and
indoor fan switches off after sixty-second purge time
has elapsed.
9.
If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which
opens the hydronic valve and turns on the indoor fan.
10.
If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Hydronic
valve closes and indoor fan switches off after sixty-
second purge time has elapsed.
11.
Place thermostat or system switch in
OFF
position.
All operation stops.
Testing Completion For Cooling-Only PTAC's
Operation testing is now complete.
If TEST jumper was set to test mode verify it is set back to
normal operation. See figure 10, page 19.
NOTICE
Do not leave unit operating with TEST jumper in
TEST position.
FINAL INSPECTION & START-UP
Straight Cooling PTAC's
Important Information
• Room temperature must be above 65°F (18°C) for
compressor to operate in cooling mode on PTAC's with
unit-mounted controllers.
• Room temperature must be below 85°F (29.4°C) to
energize the heater on PTAC's with unit-mounted
controllers.
• Room temperature must be below 85°F (29°C) for
hydronic heater to operate on PTAC's with unit-
mounted controllers.
Hydronic valve is 24 Vac normally open valve. Should
power be interrupted, valve will default to open
position.
•
When unit is first powered up, high humidity conditions
may cause condensation to form on discharge grill.
Keep doors and windows closed to reduce humidity
allowing condensation to evaporate.
Cooling Cycle
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 will begin to flow from unit.
Allow unit to continue operating to cool the room and
remove humidity.
3.
After unit starts and space gets cooler, adjust
thermostat to warmer temperature until compressor
cycles off.
4.
If a colder room temperature is desired, adjust
thermostat to cooler temperature setting, turn
compressor and both fans back on.
5.
If a warmer room temperature is desired, adjust
thermostat to warmer temperature setting.
Compressor and outdoor fan stop, indoor fan switches
off after sixty-second purge time has elapsed.
6.
Place thermostat or system switch in
OFF
position.
All operation will stop.
21
Made in USA
P/N 240010639, Rev. A [06/15/2014
]
