White Rodgers 668 User Manual

WARNING

!

WHITE-RODGERS

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.

The type 668 Oil Burner Control provides safe operation
of oil burners on heating plants where ignition during the
entire burner cycle is desired.

The 668 is used with the 956 Flame Detector

* Formerly called constant ignition.

If in doubt about whether your wiring is millivolt, line, or
low voltage, have it inspected by a qualified heating and
air conditioning contractor, electrician, or someone famil­iar with basic electricity and wiring.

Do not exceed the specification ratings.
All wiring must conform to local and national electrical

codes and ordinances.
This control is a precision instrument, and should be

handled carefully. Rough handling or distorting compo­nents could cause the control to malfunction.

TYPE 668

Intermittent Ignition* – Non Recycling

OIL BURNER CONTROL

With Series 956 Flame Detector

INSTALLATION INSTRUCTIONS

DESCRIPTION

PRECAUTIONS

CAUTION

!

To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
main fuse or circuit breaker box, until installation
is complete.

Do not use on circuits exceeding specified volt­ages. Higher voltages will damage control and
could cause shock or fire hazard.

Electrical Data
Input voltage: 668 120V. AC, 60Hz.

668H 220V. AC, 50/60Hz.

Maximum Load Current:

Oil Burner Motor (Orange Wire):

10 Amps F.L. 60 Amps L.R.

Ignition Transformer:

360VA (3.0 Amps)

Relay Voltage: 668 24 Volts AC, 60Hz.

668H 24 Volts AC, 50/60Hz

The proper Location and Mounting of the primary oil
burner control panel on the burner and the flame detector
with respect to the oil flame shall be determined by the
furnace, boiler, or burner manufacturer.

If this control, supplied as part of a furnace, boiler or
burner, is wired to the equipment or if the manufacturer
of such equipment provides instructions for wiring this

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.
9797 REAVIS RD., ST. LOUIS, MO. 63123
[phone], Fax [phone]

9999 HWY. 48, MARKHAM, ONT. L3P 3J3
[phone], FAX [phone]

Printed in U.S.A.

SPECIFICATIONS

Room Thermostat:

Set adjustable heat anticipator at 0.4 Amps. For fixed
anticipation thermostats, use 0.35 to 0.45 Amp.
heater.

Safety Timing:

668, 668H-401 to 499: 45 seconds
668, 668H-501 to 599: 30 seconds
668, 668H-601 to 699: 15 seconds

INST ALLATION AND WIRING

control, then follow his recommendations. If no special
wiring instructions are given, then follow the electrical
connections shown on this diagram for a simple system.

For more complicated systems, especially for hot water
heating, consult the manufacturer of the heating plant for
full details of the desired sequence of control operation.

PART NO. 37-5456A

Replaces 37-1794 &

37-9517

9510

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

BLACK

WHITE

LIMIT

LINE

HOT

External Line Voltage Wiring

ORANGE

IGN.
TRANS.

BURNER

N

MOTOR

THERMOSTAT

DETECTOR

WIRE
NUTS

T

TFF

FLAME

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, establish­ing 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
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.

PRIMARY

FLAME

DETECTOR

FIELD

INSTALLED

JUMPER

T

TFF

LINE VOLTAGE

THERMOSTAT OR

OPERATING

CONTROL

CONTROL

BLACK

WHITE

LIMIT

LINE

HOT

External Line Voltage Wiring

ORANGE

BURNER

N

MOTOR

IGN.
TRANS.

WIRE
NUTS

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

OLD STYLE

CELL

2

SOCKET

ASSEMBLY

Rotate Cell Assembly coun­terclockwise to remove it.
To replace it insert end
through notched opening in
bracket and rotate clock­wise. NOTE: If bracket is
ever removed from burner,
Cell Assembly will not fit if
bracket is reinstalled back­wards.

NEW STYLE

CELL ASSEMBLY

BRACKET