Model G3B Gas burner — Instruction manual
MNG3B Gas 041015
11
3. Wire Burner
(continued)
Figure 7
Wiring diagram — wire routing
M
L1
L2
T
T
Red
Gray
Bk
Wh
Blue
Br
Or
Yel
24V
HSI
L1
L2
HSI
VALVE
VALVE (GND)
Red
Pur
Yel
Blue
Bk
Wh
Pur
MV
MV
TH/TR
Red
Bk
Bk
Bk
Wh
Bk
Gn
Yel
Bk
Red
Red
Bk
Bk
Motor
120
VAC
Motor
relay
Honeywell S89C
control
Hot surface
ignitor
40
Transformer
VA
Valve on
light
Terminal
strip
Motor
end switch
Thermostat **
Spill switch (if used)
(may also be wiring in
the 120-v limit circuit)
**
120-v limit
circuit
120
VAC
GND
Hot
Neu
Control panel enclosure
Combination
gas valve
NOTICE
: Line voltage polarity
The hot and neutral power wires
must connect as shown for correct
operation of the burner controls.
Br = brown
Gr = green
Bk = black
Blue = blue
Or = orange
Pur = purple
Gray = gray
Wire color coding
120
factory wiring
VAC
24
factory wiring
VAC
120
field wiring
VAC
24
field wiring
VAC
Wire connector
G3B01
Line switch **
**
Supplied by installer
Red = red
Wh = white
Yel = yellow
Bk
GND (BURNER) Gn
Yel
24V (GND)
Yel
Gnd
Connect ground wires
to green terminal strip
screws when replacing
a Fenwal control with a
Honeywell S89C.
Verify power supply
1. The burner requires a 120
vac
/60
hz
/single-phase power supply. The
current draw will be aproximately 8.0 amps. Protect line with a 10-amp
or 15-amp fuse or breaker.
2. The 120
vac
power connections to the burner must be connected as
shown in Figure 7. The control is polarity-sensitive, and will not work if
the hot and neutral lines are reversed.
3. Verify that the power supply to the burner is no less than 102
vac
nor
more than 132
vac
.