359513-UIM-A-0408
Johnson Controls Unitary Products
13
COOLING OPERATION
During cooling operation, the control will receive thermostat signals at
the Y and O input terminals. The control will energize the M compressor
output terminal. This signal energizes the coil of the compressor con-
tactor causing the compressor to run. The control also delivers power to
the COND FAN terminals causing the outdoor fan to operate. The con-
trol energizes the REV VALVE terminal with 24VAC to switch the
reversing valve.
HEATING OPERATION
During normal heating mode, the control will receive a thermostat signal
at the Y input terminal. The control will energize the M compressor out-
put terminal. This signal energizes the coil of the compressor contactor
causing the compressor to run. The control also delivers power to the
COND FAN terminals causing the outdoor fan to operate. The reversing
valve is not energized in heating mode.
EMERGENCY HEAT
When the thermostat calls for emergency heat operation (W signal with-
out a Y signal), the control will de-energize the compressor and ener-
gize the W1/66 terminal immediately.
PRESSURE SWITCH FAULT & LOCKOUT
The heat pump is equipped with a pressure switch and an optional low
pressure switch that are connected to the control at the pressure switch
terminals. If the pressure switch input opens for more than 40 millisec-
onds, the control will de-energize the compressor. If the pressure switch
closes and a thermostat call for compressor operation is present, the
control will apply the five-minute anti-short cycle delay timer and start
the compressor when the timer expires.
When the compressor is started following a pressure switch fault, the
control will start a six-hour timer based on accumulated compressor run
time. If the control senses another opening of the pressure switch
before the timer expires, it will cause a soft lockout condition. The sec-
ond opening of the pressure switch must be greater than 160 millisec-
onds for the lockout to occur. If the second opening is between 40 and
160 milliseconds, the control will de-energize the compressor but not
cause a soft lockout condition. If the control does not sense a second
pressure switch opening before the six-hour timer expires, the timer and
counter will be reset.
During the soft lockout mode, the control will de-energize the compres-
sor and energize the X/L output with the appropriate flash code.
The control will reset the soft lockout condition when any of the follow-
ing occur following removal of the fault condition.
1.
Power is cycled to the R or Y inputs of the control. This will cause
the soft lockout condition to be reset when the thermostat is satis-
fied or when the thermostat is set to SYSTEM OFF and back to
HEAT or COOL mode.
2.
The TEST terminals are shorted for more than two seconds.
When the soft lockout condition is reset, the control will stop displaying
the fault code and will respond to thermostat inputs normally.
INDICATIONS OF PROPER OPERATION
Cooling
Cooling operation is the same as any conventional air conditioning unit.
1.
The outdoor fan should be running, with warm air being dis-
charged from the top of the unit.
2.
The indoor blower (furnace or air handler) will be operating, dis-
charging cool air from the ducts. Coils or other parts in the air cir-
cuit should be cleaned as often as necessary to keep the unit
clean. Use a brush, vacuum cleaner attachment, or other suitable
means.
3.
The vapor line at the outdoor unit will feel cool to the touch.
4.
The liquid line at the outdoor unit will feel warm to the touch.
Heating
Indications of proper Heating operation is as follows:
1.
The outdoor fan should be running, with cool air being discharged
from the top of the unit.
2.
The indoor blower (furnace or air handler) will be operating, dis-
charging warm air from the ducts.
3.
The vapor line at the outdoor unit will feel warm to the touch.
4.
The liquid line at the outdoor unit will feel cool to the touch.
SECTION IX: INSTRUCTING THE OWNER
Assist owner with processing warranty cards and/or online registration.
Review Owners Guide and provide a copy to the owner and guidance
on proper operation and maintenance. Instruct the owner or the opera-
tor how to start, stop and adjust temperature setting.
When applicable, instruct the owner that the compressor is equipped
with a crankcase heater to prevent the migration of refrigerant to the
compressor during the “OFF” cycle. The heater is energized only when
the unit is not running. If the main switch is disconnected for long peri-
ods of shut down, do not attempt to start the unit until 8 hours after the
switch has been connected. This will allow sufficient time for all liquid
refrigerant to be driven out of the compressor.
The installer should also instruct the owner on proper operation and
maintenance of all other system components.
MAINTENANCE
1.
Dirt should not be allowed to accumulate on the outdoor coils or
other parts in the air circuit. Clean as often as necessary to keep
the unit clean. Use a brush, vacuum cleaner attachment, or other
suitable means.
2.
The outdoor fan motor is permanently lubricated and does not
require periodic oiling.
3.
If the coil needs to be cleaned, it should be washed with Calgon
Coilclean (mix one part Coilclean to seven parts water). Allow
solution to remain on coil for 30 minutes before rinsing with clean
water. Solution should not be permitted to come in contact with
painted surfaces.
4.
Refer to the furnace or air handler instructions for filter and blower
motor maintenance.
5.
The indoor coil and drain pan should be inspected and cleaned
regularly to prevent odors and assure proper drainage.
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING
REPAIR, SERVICE, MAINTENANCE OR THE FINAL DISPOSAL
OF THIS UNIT.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND THE
OWNER HAS BEEN FULLY INSTRUCTED, SECURE THE
OWNER’S APPROVAL.