White Rodgers 668-451 Installation and Wiring cont’d, Testing, Normal Cycle, Safety Timing

INSTALLATION AND WIRING (cont’d)

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

External Line Voltage Wiring	Low Voltage Wiring	Low Voltage
		2-Wire Heating Only

				W-R	W-R TYPE 668-451
			HEATING-COOLING
PRIMARY					WIRING TERMINALS
				THERMOSTAT
CONTROL
			INSTALLED	RH	RH
			JUMPER
				W	W	FLAME
				Y		DETECTOR
					F
BLACK		ORANGE	WIRE
				G
WHITE			NUTS		F
				RC	C
			IGN.
			TRANS.
LIMIT					COOLING
					CONTACTOR
LINE
		BURNER			FAN RELAY
HOT	N
		MOTOR

RH

W

Y G

RC

H-W TYPE R8184M			W-R TYPE 668-451
WIRING TERMINALS			WIRING TERMINALS
RH		RH	RH
W	FLAME	W	W	FLAME
Y*	DETECTOR
				DETECTOR
F		W-R 2-WIRE	F
G*
F	HEATING ONLY
	THERMOSTAT		F
C
			C
COOLING
CONTACTOR
FAN RELAY

HEATING-COOLING THERMOSTAT WITH SWITCHING	*NOTE: HONEYWELL TYPE R8184M USES DUMMY “Y“
SUB-BASE (NOTE: If separate Heating & Cooling
	AND “G” TERMINALS AS TIE POINTS.
Thermostats are used, SPDT Selector switch must be used.)

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 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 should restart.

4.With the burner running, turn thermostat to its lowest setting. This should stop the burner, unless actual room temperatureisbelowthelowestsettingofthethermostat.

NOTE

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

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

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