White Rodgers 668 Testing, Normal Cycle, Safety Timing, High Limit and Thermostat Check

INSTALLATION AND WIRING CONT.

All wiring should be done in accordance with local and national electrical codes and ordinances.

LOW VOLTAGE PRIMARY CONTROL LINE VOLTAGE PRIMARY CONTROL

PRIMARY
CONTROL			THERMOSTAT
					FLAME
					DETECTOR
BLACK		ORANGE	WIRE
WHITE			NUTS
		IGN.
		TRANS.
LIMIT			T	T	F	F
LINE
HOT	N	BURNER
		MOTOR

External Line Voltage Wiring

				PRIMARY
				CONTROL
		FLAME
		DETECTOR
FIELD
INSTALLED				BLACK		ORANGE	WIRE
JUMPER					WHITE
							NUTS
							IGN.
							TRANS.
T	T	F	F		LIMIT
			LINE VOLTAGE		LINE
			THERMOSTAT OR
			OPERATING			BURNER
			CONTROL	HOT	N
						MOTOR

External Line Voltage Wiring

TESTING

The following control checks should be made after each installation to insure that the controls are correctly wired and functioning properly.

1.Open the main line switch.

2.Adjust thermostat or operating control to call for heat.

3.Operate the manual reset button on top of control.

4.Make certain that high limit control is set at the correct temperature.

5.Open the hand valve in the oil line. The system is now ready for the following tests.

A.NORMAL CYCLE:

Close the line switch. The burner should start and continue to run normally. (If burner starts, establish- ing flame, but then locks out on safety, make “Flame Detector Check” at this time.

B.SAFETY TIMING:

1.Let the burner run for about 5 minutes. Then remove one of Flame Detector leads from the “F” terminals. After a time period corresponding to the safety timing has elapsed, the control should lock out on safety, stopping the burner.

2.Open the line switch.

3.Replace Flame Detector lead removed in step 1.

4.Wait about 3 minutes. Then operate the manual reset button on top of control.

C. HIGH LIMIT AND THERMOSTAT CHECK:

1.	Close the line switch to start the burner.
2.	Lower the setting of the high limit control to its lowest
	setting. This should stop the burner, unless furnace or
	boiler temperature is below the minimum setting of the
	high limit.
3.	Return high limit control to its proper setting. Burner

5. Return thermostat to its proper setting.

D.FLAME DETECTOR CHECK: (This test is not re- quired if the control performs as described in test A.)

If the burner starts but the control locks out (stopping the burner), check the flame detector as follows:

1.Open the line switch.

2.Connect one end of a wire jumper to one of the “F” terminals.

3.Start the burner by closing the line switch. As soon as the flame has been established, connect the other end of the wire jumper to the other “F” terminal.

!WARNING

The control provides no safety protection with this jumper installed. Do NOT leave burner in this condition except for making this check.

If the control still locks out with the jumper installed, the control should be replaced. If the control does not lock out, however, check the operation of the 956 flame detector as follows:

Possible Cause of	Correction
Trouble
Open circuit in Cell	Replace Cell (or Cell Assembly)
	of 956 Flame Detector. Do not
	disturb position of bracket or
	socket assembly.
Flame detector	Locate flame detector according
improperly positioned.	to the burner manufacturer’s
	specifications.

TYPE 956 FLAME DETECTORS

should restart.

4. With the burner running, turn thermostat to its lowest

setting. This should stop the burner, unless actual

room temperature is below the lowest setting of the

thermostat.

NOTE

On systems supplying domestic hot water, burner will continue to run if low limit control is not satisfied.

OLD STYLE

CELL SOCKET ASSEMBLY

2

NEW STYLE

CELL ASSEMBLY

Rotate Cell Assembly coun- terclockwise to remove it. To replace it insert end through notched opening in

bracket and rotate clock- BRACKET wise. NOTE: If bracket is

ever removed from burner, Cell Assembly will not fit if bracket is reinstalled back- wards.