Service manual

11
B. TESTING
Place the thermostat system switch into the “OFF” position.
Once all safety precautions have been met, reinstate power to
all systems; thermostat, cooling and heating.
OFF
Starting with the system switch in the OFF position, the
display will be blank and no part of either the cooling or
heating systems will be operating.
FAN
Move the system switch to FAN. The display indicates room
temperature. The cooling system fan operates continuously at
high speed. No other components or systems are operating.
HEATING
Move the system switch to HEAT. The display will indicate
room temperature. Adjust the setpoint of the thermostat
above the room temperature displayed. After 15 to 30
seconds, the heat circuit of the thermostat will activate the
heating controls. Once the heat has turned on and is running,
adjust the setpoint below the room temperature displayed.
After 15 to 30 seconds, the heat circuit of the thermostat will
turn off and deactivate the heating controls. In heat pump
operation, indoor fan operates on only high speed .
COOLING
Move the system switch to COOL. The display will indicate
room temperature. Adjust the setpoint above room
temperature. Move the fan switch to LOW ON. The fan
operates continuously at low speed.
Move the fan switch to HIGH ON. The fan operates
continuously at high speed. Move the fan switch to LOW
AUTO, the fan will stop. Move the fan switch to HIGH
AUTO, the fan will remain off.
Adjust the setpoint 5 degrees below room temperature (if the
thermostat has been powered for more than 3 minutes, 1
st
stage
cooling and the cooling fan will come on approximately 1
minute later). If the thermostat has not been powered for more
than 3 minutes, 1
st
stage cooling and the cooling fan will come
on anywhere from 30 seconds to 3 minutes later. 2
nd
stage
cooling will come on approximately 30 seconds after the 1
st
stage.
With the fan switch in HIGH AUTO, the fan will operate at
high speed and cycle with stage 1 compressor. Move the fan
switch to LOW AUTO. The fan will operate at low speed and
cycle with stage 1 compressor. Once both stages of cooling
and both fan speeds have been verified, adjust setpoint 1
degree below room temperature. After 15 to 30 seconds, 2
nd
stage cooling will turn off while 1
st
stage remains on.
9. PACKAGED AIR CONDITIONER BLOWER
PERFORMANCE DATA
TEST CONDITION: 115 VAC, 60 HZ, 1 PHASE, DRY COIL
CHART 1