21
Low Flame Signal
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating
acts as an insulator causing a drop in the flame signal. If
the flame signal drops below a predetermined value, the
ignition control will display an error code of (1) flash on the
amber diagnostic LED. The unit will continue to operate
until the control can no longer detect flame.
Burner Temperature Switch
The burner temperature switch is mounted on the burner
box assembly to monitor the burner box temperature. It is
normally closed (electrically), auto-reset switch. This switch
guards against the burner flames not being properly drawn
into the heat exchanger.
The control senses an open blocked burner switch,
indicating that the burner temperature/pressure has
exceeded its set point. The control de-energizes the gas
valve, energizes the inducer to the pre-purge setting and
energizes the indoor blower. The initial lockout period is five
minutes. After this time elapses, the control evaluates the
state of the blocked burner switch. If the switch is closed,
the control resumes normal operation. The control will enter
a one hour lockout state if the blocked burner switch fails to
reset before the recovery timer has expired.
ID Plug
The control operational parameters are stored in ID Plug
which connects on the circuit board. The control requires a
valid ID plug present to operate in heating mode. If a valid
ID plug is not present the control will not respond to a call
for heat. However, the control will respond to thermostat
inputs “Y” or “G”, operating the appropriate fan output.
The cooling delays are ignored in this operating mode.
The control puts the burner into hard lockout and will not
respond to heating requests until the power is cycled with a
valid ID plug installed.
Abnormal Operation - Cooling
Short Cycle Compressor Delay
In the event of intermittent power losses or intermittent
thermostat operation, the control system will delay output
to the compressor contactor for three minutes from the time
power is restored or thermostat call for cooling is restored.
(Compressor is off a total of three minutes).
NOTE: Some electronic thermostats also have a
built-in compressor short cycle timer that may be
longer than the three minute delay given above.
If you are using an electronic thermostat and the
compressor has not started after three minutes,
wait an additional five minutes to allow the
thermostat to complete its short cycle delay time.
High Pressure Switch/Low Pressure Switch
Some models include a high pressure cutout switch and/
or a low pressure switch. The high pressure cutout switch
protects the refrigeration system from excessive operating
pressures. The low pressure switch protects the refriger-
ation system from very low operating pressures due to a
loss of refrigerant. Compressor operation will be disabled if
either of these devices opens.
MAINTENANCE
WARNING
HIGH VOLTAGE
Disconnect ALL power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
Have the gas heating section of the unit checked at least
once a year before the heating season begins, to be sure
that the combustion air inlet and flue outlet hoods are
not blocked by debris, which would prevent adequate
combustion air and a properly operating vent system.
Filter Replacement or Cleaning
A return air filter is not supplied with this unit; however,
there must be a means of filtering all of the return air. The
filter(s) may be located in the return air duct(s), or return
air filter grille(s). Consult with your installing dealer for the
actual location of the return air filter(s) for your unit.
Dirty filters are the most common cause of inadequate
heating or cooling performance. Filter inspection should be
made at least every two months; more often if necessary
because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
with a new, clean filter. Dirty permanent filters should be
washed with water, thoroughly dried and sprayed with a
filter adhesive before being reinstalled (Filter adhesives
may be found at many hardware stores). Permanent filters
should last several years. However, should one become
torn or uncleanable, it should be replaced.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
