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Form 436, Page 12
TYPICAL WIRING DIAGRAMS -- Pages 12 - 15
CAUTION: If any of the original wire as supplied with
the appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at least
105
o
C, except for limit control and sensor lead wires
which must be 150
o
C. See Hazard Levels, page 2.
Field Control Wiring Length and Gauge
Total Wire Distance from MinimumRecommended
Length Unit to Control Wire Gauge
150' (45.7 m) 75' (22.9 m) #18 gauge
250' (76.2 m) 125' (38.1 m) #16 gauge
350' (106.7 m) 175' (53.3 m) #14 gauge
Fan-Type, Power-Vented Model
with Intermittent Spark Pilot,
Single-Stage Heating,
Natural or Propane
OPTIONAL FACTORY WIRING
FACTORY WIRING
FIELD WIRING
WIRE NUT
CRIMP TERMINAL
2 4
CONTACTS
VENTER RELAY
OPTIONAL
S/W SWITCH
FAN CONTROL
BK
BK BK
BK
BK BK
BK
L1
(HOT)
BK
R
VENTER MOTOR
BK
BR
GROUND TERMINAL
(TERMINAL STRIP)
L2
(COM)
115/1/60, 208/1/60 OR 230/1/60
31
VENTER RELAY COIL
BL BR
BR
R
SET ANTICIPATOR AT 0.8 AMPS
W.R 1C30-339 THERMOSTAT W-S23-6 SUBBASE
W
R
W
PRESSURE
SWITCH
Y YYY
LIMIT
CONTROL
Y
GRND.
RECYCLE
G67BG-5
OR
LOCKOUT
IGNITION
CHASSIS GRND.
CONTROLLER
G770NGC-4
1
3
2
4
W
PROBE
GRND
IGNITOR
STRIP
FLAME SENSING
BK
ALTERNATE HONEYWELL
REDUNDANT GAS VALVE
BL
PILOT
OR PV
TH-TR
TH OR
MV
PV-MV
TR OR
MAIN
PILOT
W.R. OR ROBERTSHAW
REDUNDANT GAS VALVE
P
MAIN
M
C
BR
BR
BL
BL
R
BK
FIELD WIRING
TERMINAL STRIP
FACTORY WIRING
OPERATING SEQUENCE
1. SET THERMOSTAT AT LOWEST SETTING.
2. TURN ON MAIN AND PLOT MANUAL GAS VALVES.
3. TURN ON POWER TO UNIT.
5. THERMOSTAT CALLS FOR HEAT ENERGIZING THE VENTER MOTOR.
6. VENTER PRESSURE SWITCH CLOSES FIRING UNIT AT FULL RATE AFTER PILOT
8. IF THE FLAME IS EXTINGUISHED DURING MAIN BURNER OPERATION THE SAFETY SWITCH
CLOSES THE MAIN VALVE AND RECYCLES THE SPARK GAP. ON UNITS EQUIPPED
WITH THE G77ONGC-4 LOCKOUT CONTROL, IF PILOT IS NOT ESTABLISHED WITHIN 120
SECONDS (APPROX.) UNIT LOCKS OUT AND THE UNIT MUST BE RESET BY
INTERRUPTING POWER TO CONTROL CIRCUIT (SEE LIGHTING INSTRUCTIONS).
NOTES
1. THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS:
THERMOSTAT
2. THE FOLLOWING CONTROLS ARE FACTORY INSTALLED OPTIONS:
S/W SWITCH
3. DOTTED WIRING INSTALLED BY OTHERS.
4. CAUTION: IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THE APPLIANCE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105 DEGREES C., EXCEPT FOR SENSOR LEAD AND
LIMIT WIRING WHICH MUST BE 150 DEGREES C.
5. USE #18 GA WIRE FOR ALL WIRING EXCEPT FAN MOTOR CIRCUIT.
6. LINE AND FAN MOTOR BRANCH WIRE SIZES SHOULD BE OF A SIZE TO PREVENT VOLTAGE
DROPS BEYOND 5% OF SUPPLY LINE VOLTAGE.
8. SEE INSTALLATION INSTRUCTIONS FOR GREATER DETAIL.
WWW
BK BK
BR
BR
BK
G
GRD
4. SET THERMOSTAT AT DESIRED SETTING.
PROVING SEQUENCE.
7. FAN CONTROL SENSES HEAT EXCHANGER TEMPERATURE, ENERGIZING THE
FAN MOTOR.
CONTROL
BK
R
24V
LINE VOLT
BR
R
TRANSFORMER
Y
6
BK
FAN MOTOR
BKBK
5 5
5
FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW).
ON 115V. UNITS THE CONTROL TRANSFORMER IS A SINGLE VOLTAGE PRIMARY.
7. ON 230V. UNITS THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY.
FOR 230V. UNITS USE BLACK AND YELLOW LEADS (CAP RED).
FOR 115V. UNITS USE BLACK AND YELLOW LEADS.
FE 25-400 OPT. AH2/AH3 WD #97302 REV #8
7
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BROWN - BR
BLACK - BK
WIRING CODE
8