®
035-14511-000 REV B (1299)
14
Unitary Products Group
HeartBeat – LED flash rate of 500 ms ON and 500 ms OFF
Flash/Error Code – LED flash rate of 350 ms ON and 350
ms OFF for the number of codes and with a pause of
1.5 seconds between flash codes.
Resetting Fault Conditions
The control locks out the unit and does not permit it to run
when it detects certain fault conditions. Table 2 lists all the
modes indicated by the control. Control code “1” is a tempo-
rary five-minute lock-out (see Anti-short cycle above). Control
code "2" (pressure switch open) locks out the control and
does not permit the unit to start until the fault condition is cor-
rected. The fault code "2" can be reset by one of the following
three methods.
1. Reset the 24v to the control (remove 24v and then reapply)
2. Jumper the test pins at the control board
3. If there is a call for Y1 or Y2 cooling, turn the thermostat to
the off position then turn it to cool.
If methods 1 or 3 above are used, then the next call for cool-
ing will allow the unit to start following a five-minute anti-short
cycle period. If method 2 is used, then the unit will start imme-
diately with the next call for cooling.
If the fault condition continues to exist prior to re-starting the
unit, the control will lock out the unit again.
INSTRUCTING THE OWNER
Assist owner with processing warranty cards. Review Owners
Guide and provide a copy for the owner 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 periods 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 opera-
tion and maintenance of all other system components.
INDICATIONS OF PROPER OPERATION
Cooling operation is the same as any conventional air condi-
tioning unit.
The following checks may be made to determine if the sys-
tem is operating properly:
1.
The outdoor fan should be running, with warm air being
discharged from the top of the unit.
2.
The indoor blower (furnace or air handler) will be operat-
ing, discharging cool air from the ducts.
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.
If unit is not operating properly, check the following items
before calling a serviceman:
1.
Indoor section for dirty filter.
2.
Outdoor section for leaf or debris blockage.
Eliminate problem, turn off the thermostat for 10 seconds and
attempt start. Wait 5 minutes. If system does not start, call
service technician.
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 CalClean (mix one part CalClean 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 evaporator coil drain pan should be inspected and
cleaned regularly to prevent odors and assure proper
drainage.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER'S APPROVAL.
TABLE 2 : FAULT CODES
LED @
control
Description
24V @
X/L line
HeartBeat
1 Flash
2 Flash
On Steady
Off
Normal Operation
Compressor waiting to complete
Anti-short cycle period
Compressor lockout out on safety
chain trip
Control Failure
No power or Control Failure
None
None
Yes
Yes
