ECR RetroAire R90C Installation, operation & maintenance manual - page 19
Heating Cycle — Electric Option
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat for warmer temperature until
indoor fan starts running and electric heater coil starts
emitting heat.
3.
Outdoor fan does not run during heating cycle.
4.
After unit starts running and space gets warmer,
adjust thermostat to cooler temperature until electric
heater turns off.
5.
Warmer room temperature is desired, adjust
thermostat to warmer temperature setting, turn
electric heater back on.
6.
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 should stop.
NOTICE
Room temperature must be below 85°F (29.4°C)
to energize heater on PTAC's with unit-mounted
controllers.
Heating Cycle — Hydronic Option
Verify motor valve is rated for correct voltage. RetroAire
units with unit mount controls will power hydronic valve
that is same voltage as unit (ex: unit rated 208/230v will
power 208/230v).
Switch is provided on control box to change from NO to
NC. Verify wiring diagram (located on unit) and voltage
application for specific unit.
Other valve configurations and voltage options are
available. Consult Manufacturer if unit voltage does not
match your valve application.
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat to warmer temperature.
–
Signal from processor board activates water or
steam valve.
–
Motorized valve opens and allows hot water or
steam to run through coil.
–
Indoor fans run, blowing air through hydronic
coil. Units equipped with Control, indoor
fan and motorized damper operation will be
delayed until hydronic coil reaches 100 ± 5°F
(38 ± 3°C).
–
Signal to water or steam valve will continue
until room temperature rises above setpoint by
3°F (2°C).
INSPECTION & START-UP
NOTICE
DO NOT rotate thermostat knob back and forth
from heating to cooling. This causes compressor to
cycle on and off rapidly and will cause damage to
compressor. Allow compressor to remain off for at
least three minutes prior to restarting unit.
Remote-Mounted Thermostat
1.
Use thermostat to place PTAC/PTHP in either
COOL
,
HEAT
, or
OFF
position. Test operation in all positions.
2.
If thermostat is fitted with fan switch, set as desired
places fan in either
ON, OFF
, or
AUTO
. Test operation
in all positions.
3.
Check thermostat calibration for both heating and
cooling operation.
Straight Cooling PTAC's
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 should
turn on and cold air begin to flow from unit. Let unit
continue operating to cool room and remove humidity.
3.
After unit starts running and space gets cooler, adjust
thermostat to warmer temperature until compressor
cycles off.
4.
If colder room temperature is desired, adjust thermo-
stat to cooler temperature setting, turning compressor
and both fans back on.
5.
If warmer room temperature is desired, adjust ther-
mostat to warmer temperature setting. Compressor
and outdoor fan stops and indoor fan switches off after
sixty-second purge time has elapsed.
6.
Place thermostat or system switch in the
OFF
position.
All operation should stop.
NOTICE
Room temperature must be above 65°F (18°C) for
compressor to operate in cooling mode on PTAC's
with unit mounted controllers.
NOTICE
When unit is first powered up, high humidity
conditions can cause condensation to form on
discharge grill. Keep doors and windows closed to
reduce humidity, condensation will evaporate.
P/N 240010330, Rev. A [10/15/2013]
19
Made in USA