2.Pressure Switch (PS) - If the draft motor should fail, the pressure switch prevents the ignition controls and gas valves from being energized.
3.Flame Sensor - The flame sensor and controls are located per Proper Flame Adjustment, Figure 12. If an ignition control fails to detect a signal from the flame sen- sor indicating the pilot flame is properly ignited, then the main gas valve will not open.
4.Rollout Switch (RS) - This switch is located in the burner vestibule. In the event of a sustained main burner flame rollout, it shuts off the ignition control and closes the main gas valve.
NOTE: The manual reset Rollout Switch (RS) must be reset before allowing furnace operation.
5.Auxiliary Limit Switch (ALS) - This control is located inside the heat exchanger compartment and is set to open at 160°F. It is a manual reset switch. If ALS trips, then the primary limit (LS) has not functioned correctly. Replace the primary limit LS.
TABLE 11: IGNITION CONTROL BOARD FLASH CODES
Flash Code | Description |
|
|
Heart Beat | Normal Operation |
|
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2 Flashes | Pressure switch open with inducer on |
|
|
3 Flashes | Pressure switch closed with inducer off |
|
|
4 Flashes | Not Used |
|
|
5 Flashes | Lockout from too many flame losses |
|
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6 Flashes | High temperature switch open |
|
|
7 Flashes | Rollout switch open |
|
|
8 Flashes | Flame present with gas off |
|
|
9 Flashes | Gas valve stuck OFF or ON |
|
|
10 Flashes | Flame sense circuit failure |
|
|
COOLING
When the thermostat calls for COOL, the thermostat termi- nals G and Y are energized signaling the compressor and outdoor fan to run.
With a call for Y, the circulating fan is energized at cooling speed.
When the thermostat is satisfied, terminals G and Y are de- energized,
After a cool fan off delay timing of 30 seconds the circulating fan is
CIRCULATING FAN
When the thermostat calls for FAN, the thermostat terminal G is energized signaling the circulating fan to run at the cool speed.
If a call for COOL occurs, the circulating fan continues to run at the cool speed.
If a call for HEAT occurs, the circulating fan switches to heat speed after a 30 second delay.
When the thermostat ends the call for FAN, the thermostat terminal G is
START-UP
PRE-START CHECK LIST
Complete the following checks before starting the unit.
1.Check the type of gas being supplied. Be sure that it is the same as listed on the unit nameplate.
2.Make sure that the vent outlet air hoods has been prop- erly installed.
OPERATING INSTRUCTIONS
1.STOP! Read the information on the unit safety label.
2.Set the thermostat to the OFF position.
3.Turn off all electrical power to the unit.
4.DO NOT try to light the burners by hand. This appliance is equipped with an ignition device which automatically lights the burners.
5.Remove the access panel.
6.Turn the gas valve switch to the OFF position.
7.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow B in the information on the unit safety label. If you don't smell gas, go to the next step.
8.Turn the gas valve switch to the ON position.
9.Replace the control access panel.
10.Turn on all electric power to the unit.
11.Set the thermostat to the desired setting.
12.If the unit will not operate, follow the instructions To Turn Off Gas To Appliance and call your service technician or gas supplier.
TO TURN OFF GAS TO UNIT
1.Set the thermostat to the OFF position.
Johnson Controls Unitary Products | 15 |
