Form I-XE/CRGB/RPB, Mfg No. 131782 Rev 4, Page 21
Model CRGB , Outdoor, Gravity-Vented Furnace with Two-Stage Gas Valve
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
8
8
10
10
12
6
6
4
11
11
Y
Y
Y
Y
Y
BL
BK
BL
BL
R
R
R
7
7
7
BK
BR
25
H
TD
H
BR
GRND.
BR
RECYCLE
G67BG-5
OR
LOCKOUT
IGNITION
CHASSIS GRND.
CONTROLLER
G770NGC-4
1
3
2
4
W
G
PROBE
GRND
IGNITOR
STRIP
FLAME SENSING
BR
BK
BL
7
17
FAN TD
HEATER
BR
CR
R
17
BR
7
CONTACTOR COIL
BLOWER MOTOR
7 - 8 - 9
CRGB SERIES AH2 OR AH3-AG2-CL7 DWG. #B-225511
RSM
8
13
R
R
LOW STAGE
PILOT
HIGH STAGE
BR
7
BL
13
O
R
SET
ANTICIP
AT
OR A
T
0.8 AMPS
T874F
THERMOST
AT
Q674G SUBBASE
W2
W1
LINE/3/60
OR
W
BK
BK
LINE/1/60
GRD
G
R OR W
R OR BK
R
PROTECTED
BLOWER
MOTOR
INTERNALLY
CONTACTOR
BLOWER MOTOR
CONTACTS
L2
L3
L1
T1
T2
T3
40 VA. CONTROL
BK
BL
24V
LINE VOLT
BR
R
TRANSFORMER
Y
L2
L1
Y
BK
5
4
34
33
UNIT AUTOMATIC
LIMIT CONTROL
LIMIT
AUTO RESET
REVERSE FLOW
225511
HIGH STG
HI
PV
PILOT
STG
LOW
C
MV
REDUNDANT
GAS V
AL
VE
HONEYWELL
TWO
ST
AGE
OPTIONAL
(SEE NOTES)
DISCONNECT SWITCH
CONTACTS
FAN TD
1
3
PILOT
AL
TERNA
TE W
.R.
TWO ST
AGE
REDUNDANT
GAS V
AL
VE
R
BL
3
HIGH STG
4
BK
STG
2
LOW
1
BR
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BROWN - BR
BLACK - BK
WIRING CODE
OPTIONAL FIELD WIRING
OPTIONAL FACTORY WIRING
FACTORY WIRING
FIELD WIRING
TERMINAL BLOCK -- HEATER COMPARTMENT
TERMINAL BLOCK -- BLOWER COMPARTMENT
4, 6, 7, 8, 10, 11 & 13
6, 7, 8, 10, 12, 13, L1 & L2
TOTAL WIRE MINIMUM RECOMMENDED
LENGTH WIRE SIZE
150 FEET #18 GA.
250 FEET #16 GA.
350 FEET #14 GA.
FIELD CONTROL WIRING
7. USE #12 GA. WIRE FOR LINE AND MOTOR WIRING ON SINGLE PHASE UNIT.
6. USE #14 GA. WIRE FOR LINE AND MOTOR WIRING ON 3 PHASE UNIT.
PREVENT VOLTAGE DROP BEYOND FIVE PERCENT OF SUPPLY LINE VOLTAGE.
5. LINE AND BLOWER MOTOR BRANCH CIRCUIT WIRE SHOULD BE SIZED TO
A TEMPERATURE RATING OF AT LEAST 105° C., EXCEPT FOR
MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING
4. CAUTION: IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
3. DOTTED WIRING AND THE FOLLOWING CONTROLS ARE SUPPLIED AND INSTALLED
2. THE FOLLOWING CONTROLS ARE SUPPLIED AS OPTIONAL EQUIPMENT:
1. THE FOLLOWING CONTROLS ARE SUPPLIED BY REZNOR FOR FIELD INSTALLATION:
THERMOSTAT
SENSOR LEAD WIRE WHICH MUST BE 150° C.
8. USE #18 GA. WIRE FOR 24 VOLT CONTROL WIRING ON UNIT.
BY OTHERS: NONE
NONE
NOTES
9. ON 208/230V. UNIT THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY.
FOR 230V. UNITS USE BLACK AND YELLOW LEADS (CAP RED).
FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW).
ON 115/460V. UNITS THE CONTROL TRANSFORMER IS A SINGLE VOLTAGE PRIMARY.
FOR 115/460V. UNITS USE BLACK AND YELLOW LEADS.
USE DUAL ELEMENTS TIME DELAY FUSES AND SIZE ACCORDING TO 1.25
TIMES THE MAXIMUM TOTAL INPUT AMPS.
10. WHEN PROVIDING OR REPLACING FUSES IN THE FUSIBLE DISCONNECT SWITCH
11. DISCONNECT SWITCH IS FIELD FURNISHED OR AVAILABLE FROM FACTORY AS AN OPTION.
OPERATING SEQUENCE
1. SET THERMOSTAT SWITCH AT "OFF" POSITION.
2. TURN ON POWER AND MANUAL GAS VALVE TO UNIT.
3. SET THERMOSTAT SWITCH AT "AUTO" POSITION.
(B) BLOWER MOTOR OPERATES FROM FAN TIME DELAY.
(A) FIRING RATE IS CONTROLLED BY THE TWO STAGE THERMOSTAT.
4. SET THERMOSTAT SWITCH AT "OFF" POSITION (OPEN) FOR SHUTDOWN.
(A) BLOWER MOTOR REMAINS ON AS DETERMINED BY FAN TIME DELAY.
FIRING SEQUENCE:
1. ON A CALL FOR HEAT BY THE LOW STAGE OF THERMOSTAT.
(A) THE PILOT GAS VALVE AND SPARK GAP ARE ENERGIZED TO PRODUCE
A PILOT FLAME ON EACH OPERATING CYCLE. THE SENSING PROBE
PROVES THE PRESENCE OF THE PILOT FLAME AND ENERGIZES THE
SAFETY SWITCH PORTION OF THE CONTROL. THE SWITCH ACTION
DE-ENERGIZES THE SPARK GAP AND ENERGIZES THE MAIN VALVE.
THE MAIN GAS IGNITES AND THE UNIT FIRES AT LOW RATE.
2. ON A CALL FOR HEAT BY THE HIGH STAGE OF THERMOSTAT UNIT
FIRES AT FULL RATE.
3. IF THE FLAME IS EXTINGUISHED DURING MAIN BURNER OPERATION THE
SAFETY SWITCH CLOSES THE MAIN VALVE AND RECYCLE THE SPARK GAP.
ON UNIT EQUIPPED WITH G77ONGC-4 LOCKOUT CONTROL, IF PILOT IS
NOT ESTABLISHED WITHIN 120 SECONDS (APPROX.) UNIT LOCKS OUT
AND MUST BE RESET BY INTERRUPTING POWER TO CONTROL CIRCUIT (SEE
LIGHTING INSTRUCTIONS.)
