ICP PGN324 Installation instructions manual - Warning
17
LED MONITOR
An LED (light--emitting diode) indicator is provided on the
control board to monitor operation. The control board is
located by removing the burner access panel. During
normal operation, the LED is continuously on (See Table 4
for error codes).
Table 3—
LED Indications
ERROR CODE
LED INDICATION
Normal Operation
On
Hardware Failure
Off
Fan On/Off Delay Modified
1 Flash
Limit Switch Fault
2 Flashes
Flame Sense Fault
3 Flashes
Four Consecutive Limit Faults
4 Flashes
Ignition Lockout Fault
5 Flashes
Induced--Draft Motor Fault
6 Flashes
Rollout Switch Fault
7 Flashes
Internal Control Fault
8 Flashes
Temporary Lock--Out (1 hr)
9 Flashes
NOTES:
1. There is a 3 sec. pause between error code displays.
2. If more than one error code exists, all applicable error codes will be displayed in
numerical sequence.
3. This chart is on the wiring diagram located inside the burner access panel.
LIMIT SWITCHES
Normally closed limit switch (LS) completes the control
circuit. Should the leaving--air temperature rise above the
maximum allowable temperature, the limit switch opens
and the control circuit “breaks.” Any interruption in the
control circuit instantly closes the gas valve and stops gas
flow to the burners and pilot. The blower motor continues to
run until LS resets.
When the air temperature at the limit switch drops to the
low--temperature setting of the limit switch, the switch
closes and completes the control circuit. The direct--spark
ignition system cycles and the unit returns to normal heating
operation.
ROLLOUT SWITCH
The function of the rollout switch is to close the main gas
valve in the event of flame rollout. The switch is located
above the main burners. When the temperature at the
rollout
switch
reaches
the
maximum
allowable
temperature, the control circuit trips, closing the gas valve
and stopping gas flow to the burners. The indoor
(evaporator) fan motor (IFM) and induced draft motor
continue to run until switch is reset. The IGC LED will
display FAULT CODE 7.
Step 3—START--UP COOLING AND MAKE ADJUST-
MENTS
Complete the required procedures given in the
Pre--Start--Up section before starting the unit. Do not
jumper any safety devices when operating the unit. Do not
operate the compressor when the outdoor temperature is
below 40°F (4.4°C) (unless accessory low--ambient kit is
installed). Do not rapid--cycle the compressor. Allow 5
minutes between on cycles to prevent compressor
damage.
EXPLOSION AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
System under pressure. Relieve pressure and recover
all refrigerant before system repair or final unit disposal.
Use all service ports and open all flow--control devices,
including solenoid valves.
!
WARNING
CHECKING COOLING CONTROL OPERATION
Start and check the unit for proper cooling control operation
as follows:
1. Place room thermostat SYSTEM switch in OFF
position. Observe that blower motor starts when FAN
switch is placed in ON position and shuts down when
FAN switch is placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN
switch in AUTO position. Set cooling control below
room temperature. Observe that compressor,
condenser fan, and evaporator blower motors start.
Observe that cooling cycle shuts down when control
setting is satisfied. The evaporator fan will continue to
run for 30 sec.
3. When using an auto--changeover room thermostat,
place both SYSTEM and FAN switches in AUTO
positions. Observe that unit operates in Heating mode
when temperature control is set to call for heating
(above room temperature) and operates in Cooling
mode when temperature control is set to call for cooling
(below room temperature).
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R--22
refrigerant and is tested and factory sealed. Allow system
to operate a minimum of 15 minutes before checking or
adjusting charge.
NOTE:Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R--22
charge.
A refrigerant charging label is attached to the outside of the
service access door. The chart includes the required
suction line temperature at given suction line pressures and
outdoor ambient temperatures.
An accurate superheat, thermocouple-- or thermistor--type
thermometer, and a gauge manifold are required when
using the superheat charging method for evaluating the unit
charge. Do not use mercury or small dial--type
thermometers because they are not adequate for this type
of measurement.