22
Installation, Operation, And Service Instructions
WH
T
BL
U
WHT
RE
D
BL
K
OR
N
OIL
PREHEATER BLOCK
CONTROLLER
WHT
RED
HTR
PR
I
L2
L1
BLOWER MOTOR
WH
T
HIGH
VOLTAGE
TRANS-
FORMER
BL
K
PHOTO EYE
FLAME SENSOR
OIL PRIMARY CONTROL
(IE, Honeywell, etc.)
BL
K
ORN
WH
T
THERMOSTAT
CONNECTION
500W
HEAT
ROD
Bi
METAL
HIGH
LIMIT
SWITCH
THERMO-
COUPLE
OIL
PREHEATER
BLOCK
Fuse
Power Switch
BL
K
BL
K
WH
T
WH
T
RE
D
WHT
WHT
WH
T
RE
D
BL
U
RED
Power Plug
(Looking at Terminal Side)
BL
K
Oil Valve
BL
K
GRN
Power Socket
Electrical Box
(Looking at Socket Side)
Burner Assembly
N
H
Oil Pump
WHT
BLK
WHT
YEL
Service Switch
Fused Disconnect Switch
H
N
GND
(Items Supplied By Installer)
120 VAC
T
T
Circulator
Thermostat
T
T
2
1
3
4
5
6
Honeywell
R845A
Low
Water
Cutoff
High
Limit
L4006E
High
Limit
L4008A
Set Temp 20
Deg Higher
Than L4008A
(Supplied by Installer)
(Supplied by Installer)
(Supplied by Installer)
RED
Figure 34. WIRING DIAGRAM, SINGLE HEATING ZONE ONLY, OWB-350 AND OWB-500