State Industries SRT80 120NE warranty Sequence of Operation, Error Codes, Fault Conditions

SEQUENCE OF OPERATION

1.When the control is powered up the outdoor interface and the remote interface should display a blank line and copyright on the 2-line display.

2.After one second, the display should switch to indicate that the touch switches are calibrating. During this process, the Running LED will flash once per second until all of the switches have been calibrated. This is an automatic process and can take several seconds. Placing hands or fingers near the switches can delay this process.

3.The control is now initialized and the display will change to display the temperatures screen if no error is detected.

4.The system is checked for faults and, if detected, the Service light will flash. If the fault is a temperature probe fault, the Service LED will remain on without flashing. Whenever a fault is detected, the display will switch to display the Current Error screen.

5.If the control determines that the actual water temperature inside the tank is below the programmed temperature setpoint less the differential, a call for heat is activated. This call for heat is generated even if the ignition module has detected an error, however, if the ignition module has detected a fault, the ignition sequence will not advance. Provided that no fault has been detected, the Running LED will turn on.

6.If the Low-Water Cut-Off is satisfied, the ignition module will then perform selected system diagnostic checks. This includes confirming the proper state of the air switches and the ECO limit device.

7.If all checks are successfully passed, the combustion blower is energized for the pre-purge cycle.

8.When the pre-purge cycle is complete, power is applied to the igniter element for the igniter warm-up period.

9.At the conclusion of the igniter warm-up period, the gas valve will open, allowing gas to enter the burner chamber.

10.The igniter will remain on for a short predetermined time period, then it will be turned off.

11.The control will monitor the flame sense probe to confirm a flame is present. If a flame is not verified within the predetermined flame prove time, the gas valve will immediately be closed and the blower will continue to run for approximately 10 seconds. The control will then return to step 6.

12.If a flame is confirmed, the control will enter the heating mode where it will continue heating the tank until the setpoint temperature is reached. At this point, the gas valve is closed and the control enters the post-purge cycle.

13.The combustion blower will run for the duration of the postpurge cycle to purge the system of all combustion gasses. When the post purge cycle is complete, the blower is deenergized and will coast to a stop.

14.The control will now enter the standby state as indicated by the Standby LED. The control will continue to monitor the tank water temperature and the state of the other system devices. If the temperature drops below the setpoint value less differential,

the control will automatically return to step 5 and repeat the entire operating cycle. During this entire process, if the control detects an improper operating state for external devices such as the ECO switch, blower prover switch, etc., the appropriate indication will be given on the interface modules.

ERROR CODES

These error codes will be displayed if there is a problem with

ignition or operation of the heater. They will be displayed on the LCD screen on the outdoor interface module and the remote interface module.

The following error codes are codes related to the temperature probes:

Outlet Probe

Tank Probe

The following error codes are related directly to the Ignition Module:

I.M. Lock Out

I.M. PS Closed

I.M. PS Open

I.M. ECO

I.M. 115V Reversed

I.M. Low Flame

I.M. Igniter

I.M. Flame Fault

Note: The ignition module faults are only reset after a one hour delay period after the fault, or by cycling the power.

FAULT CONDITIONS

Fault: OUTLET PROBE

There is a problem with the outlet temperature probe

	Possible Cause		Remedy
1.	Outlet temperature probe	1.	Check that the temperature
	is not connected (Wiring		probe is connected properly
	disconnect)
2.	Outlet temperature probe	2.	Repair wiring
	wiring is open or closed
3.	Defective outlet	3.	Replace probe
	temperature probe

Fault: TANK PROBE

There is a problem with the tank temperature probe

	Possible Cause		Remedy
1.	Tank temperature probe is	1.	Check that the temperature
	not connected (Wiring		probe is connected properly
	disconnect)
2.	Tank temperature probe	2.	Repair wiring
	wiring is open or closed
3.	Defective tank temperature	3.	Replace probe
	probe

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