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WIRING
All wiring should be done in accordance with local and national electrical codes and ordinances.
If the boiler or burner manufacturer recommends a wiring
diagram, then follow such recommendations. If none is offered,
this diagram shows a suggested circuit.
LOW LIMIT APPLICATION — This diagram shows a common
circuit on an oil fired heating system that also heats domestic hot
water which is stored in a tank.
TYPE 668 OIL
BURNER CONTROL
(LINE VOLTAGE)
SETTING THE CONTROL
CONTROLS WITH ADJUSTABLE DIFFERENTIAL
The movable indicator points to the temperature at which the
contacts open. The fixed indicator points to the temperature at
which the contacts close. The difference between these two
indicators is the differential.
T
T
HIGH LIMIT
CONTROL
IGNITION
TRANS.
BURNER
MOTOR
"B" FIXED INDICATOR
(CUT-IN POINT)
"C" DIFFERENTIAL
ADJUSTING SCREW
"D" MOVABLE INDICATOR
(CUT-OUT POINT)
"A" ADJUSTING
SLOT
Low limit control maintains domestic hot water temperature all
year round.
When thermostat calls for heat, burner and circulator operate.
THERMOSTAT
FIELD
INSTALLED
JUMPERS
TYPE
829A RELAY
5
3
4
6
LOW LIMIT
CONTROL
CIRCULATOR MOTOR
To set the control:
1.
Use a screwdriver in the adjusting slot (A) on the front of the
control to turn the dial so that the fixed indicator (B) points
to the temperature at which the contacts will close.
2.
Turn the differential adjusting screw (C) until the movable
indicator (D) points to the temperature at which the contacts
will open.
2
T
T
1
HOT
LINE
2
N
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