3
HOT
HIGH
LIMIT
N
LINE
CIRCULATOR
MOTOR
W
Y
COM
R
G
RELAY/TRANSFORMER
TRANSFORMER
RELAY COIL
WHITE
F
F
T
T
BLACK
WHITE
ORANGE
IGNITION
TRANS.
BURNER MOTOR
TYPE 668
OIL BURNER CONTROL
TYPE 956
FLAME
DETECTOR
BLACK
ZONE VALVES (N.C.)
W-R 2-WIRE HEATING THERMOSTATS
BROWN
BLUE
BLACK
BLACK
RED
BROWN
TAPE
OFF
N.C.
N.O.
BLUE
STAT
BLACK

DIAGRAMS FOR SYSTEMS WHERE BURNER AND CIRCULATOR

OPERATION IS INDEPENDENT OF THERMOSTATS

DIAGRAM FOR SYSTEMS WHERE INTERNAL TRANSFORMER OF RELAY CONTROL SUPPLIES POWER

FOR ZONE VALVES

Fig. 6 Zone Valve (N.C.)
WIRING CONT.

All wiring should be done according to local and national electrical codes

Fig. 7
Diagram for Oil-Fired system using Relay/
Transformer with Zone Valves (N.C.)
CIRCULATOR MOTORZONE VALVES (N.C.)W-R 2-WIRE HEATING THERMOSTATS
BROWN
BLUE
BLACK
BLACK
HOT
LINE
N
BROWN
BLUE
BLACK
BLACK
BLACK
HOT
N
LINE
TRANSFORMER ADDITIONALZONES
BLUE
STAT
1
B2
C1 C2
T1 2
B1T2
HOT
N
LINE
BLACK
IGN.TRANS.BURNERMOTORRELAY/TRANSFORMERTRANSFORMER
HOT
N
LINE
TRANSFORMER
24 VAC
ZONE VALVES (N.C.)
W-R 2-WIRE HEATING THERMOSTATS
BROWN
BLUE
24 VACGAS VALVEHIGH LIMITCOMMONG (BLK)MUST BE N.E.C.CLASS 1 WIRING
Fig. 7a Diagram for Gas-Fired System,
eliminate Oil Burner for Gas-Fired system

DIAGRAMS FOR SYSTEMS WHERE EXTERNAL TRANSFORMER REQUIRED FOR POWERING FOR ZONE

VALVES

Fig. 8
Diagram for for System using Relay/transformer
with Zone Valves (N.C.)