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WIRING & OPERATION CONT.
THERM PILOT TRANS
T
T
CONNECTIONS TO CIRCULATOR
Circulator Operation
1. Unzoned Systems, or Circulator-Zoned Systems — The
thermostat cycles the circulator motor (through a relay) to
meet the demand for heating.
2. System Zoned with Water Valves – Auxiliary contacts of
water valves cycle circulator motor (through a relay) to meet
the demand for heating. (The circulator runs as long as any
zone is calling for heat.)
1 2 L L
TYPE 809 RELAY
CIRCULATOR
MOTOR
LINE
HOT
N
1 2 L L
TRANSFORMER
HOT
LINE
N
4
56
4
56
4
56
4
56
4
56
1
2
3
452
6
1
2
3
452
6
1
2
3
452
6
1
2
3
452
6
1
2
3
452
6
ADDITIONAL
ZONES
TYPE 668 OIL
BURNER CONTROL
INDOOR
OUTDOOR
CONTROL
HIGH LIMIT
IGNITION
TRANS.
BURNER MOTOR
N
HOT
LINE
Using Oil burner control
N
HOT
LINE
HIGH LIMIT
SAFETY
PILOT
TRANSFORMER
24V A.C.
DIAPHRAGM
GAS VALVE
SAFETY
PILOT
LOW VOLTAGE
GAS VALVE OR
SOLENOID GAS
VALVE
INDOOR
OUTDOOR
CONTROL
HIGH LIMIT
24V A.C.
LINE
N
HOT
TRANSFORMER
Using Gas or
Solenoid Gas
Valve
THERMOSTAT
TYPE 809
RELAY
FIELD
INSTALLED
JUMPER
CIRCULATOR
MOTOR
HOT
LINE
N
INDOOR
OUTDOOR
CONTROL
For Unzoned Sytems,
or Systems Zoned
With Circulators
For Systems Zoned
With Water Valves
All wiring should be done in accordance with local and national electrical codes and ordinances.
BURNER CONNECTIONS
Using diaphragm
Gas Valve
Burner Operation
The indoor-outdoor control cycles the burner
to vary boiler temperature to outdoor weather
conditions.