3
HOT
HIGH
LIMIT
N
LINE
CIRCULATOR
MOTOR
W
Y
COM
R
G
RELAY/TRANSFORMER
TRANSFORMER
RELAY COIL
WHITE
F
F
T
T
BLACKWHITE
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
BROWNTAPE
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/TRANSFORMERTRANSFORMERHOT
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