Reznor SCE Unit Installation Manual - Manual (Page 22)

Form RZ-NA I-SCE, Page 22
FIGURE 21 - W. D. 225636, Model SCE with Two-Stage Gas Control
Typical Wiring Diagrams (cont'd)
SCE: AH2/AH3 AG2-CL7-CH1 DWG. #225636 RSM
225636
6
7
8
9
10
11
12
13
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
RELAY CONTACTS
1 3
TIME DELAY & CAPACITOR
VENTER MOTOR
B C W
8
4
11
11
Y
BL
BK
BL R
BK BK BK BK
7
7
7
BK BR 24
H TD H
BR
GRND.
BR
RECYCLE
G67BG-5
OR
LOCKOUT
IGNITION
CHASSIS GRND.
CONTROLLER
G770NGC-4
1
3
2
4
W G
PROBES
GRND
IGNITOR
STRIP
FLAME SENSING
BR
W 22
H TD H
BR
7
BK
BL
TIME DELAY
RELAY COIL
12 - 27
19
FAN TD
HEATER
CR
19
7 CONTACTOR COIL
BLOWER MOTOR
7 - 8 - 9
BK
LOW STAGE
PILOT
R
R LIMIT
CONTROL
BR
Y
R
RH
SET
ANTICIP
AT
OR
AT
1.0
AMPS
T874F
THERMOST
AT
Q674G SUBBASE
W2
(ADD RH-RC
W1
RC
JUMPER)
13
HIGH STAGE
OPTIONAL
R 10
40 VA. CONTROL
TRANSFORMER
24V
BL
BK
R
LINE VOLT
BR
Y
BR
B
7
W
8
10 8
OPTIONAL SP-ST
SUMMER/WINTER SWITCH
W
TIME DELAY
RELAY CONTACTS
Y
4 5
W 1
COMBUSTION
PRESSURE
SWITCH
R 12
NO
NC
BK
COM
W 2
R
BK Y
BK BK
HIGH STG
HI
PV
PILOT
STG LOW
C
MV
REDUNDANT
GAS V
AL
VE
HONEYWELL
TWO ST
AGE
DISCONNECT SWITCH
1/60 OR 3/60
LINE
GRD
G
R OR W
R OR BK
R
PROTECTED
BLOWER
MOTOR
INTERNALLY
CONTACTOR
BLOWER MOTOR
CONTACTS
L2
L3
L1
W BK BK
T1
T2
T3
(SEE NOTES)
CONTACTS
FAN TD
1 3
BL
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
WIRING CODE
BLACK - BK
BROWN - BR
RED - R
ORANGE - O
YELLOW - Y
GREEN - G
BLUE - BL
PURPLE - PR
WHITE - W
TOTAL WIRE MINIMUM RECOMMENDED
LENGTH WIRE SIZE
150 FEET #18 GA.
250 FEET #16 GA.
350 FEET #14 GA.
FIELD CONTROL WIRING
OPTIONAL FIELD WIRING
OPTIONAL FACTORY WIRING
FACTORY WIRING
FIELD WIRING
TERMINAL BLOCK -- HEATER COMPARTMENT
1, 2. 4, 7, 8, 10, 11,
12, 13, B, C & W
3. IF THE FLAME IS EXTINGUISHED DURING MAIN BURNER OPERATION THE
SAFETY SWITCH CLOSES THE MAIN VALVE AND RECYCLES THE SPARK GAP.
ON UNIT EQUIPPED WITH G770NGC-4 LOCKOUT CONTROL, IF PILOT IS
NOT ESTABLISHED WITHIN 120 SECONDS (APPROX.), THE UNIT LOCKS OUT
AND MUST BE RESET BY INTERRUPTING POWER TO CONTROL CIRCUIT
(SEE LIGHTING INSTRUCTIONS).
OPERATING SEQUENCE
1. SET THERMOSTAT SYSTEM SWITCH AT "OFF" POSITION.
2. TURN ON POWER AND MANUAL GAS VALVES TO UNIT.
1. ON A CALL FOR HEAT BY THE LOW STAGE OF THERMOSTAT.
(A) THE VENTER MOTOR IS ENERGIZED AFTER A 15 SECOND (APPROX.) TIME DELAY.
(B) VENTER FLOW SWITCH SWITCHES FROM N.C. TO N.O. CONTACTS ENERGIZING
THE PILOT GAS VALVE AND SPARK TO PRODUCE A PILOT FLAME ON EACH
OPERATING CYCLE. THE SENSING PROBE PROVES THE PRESENCE OF THE PILOT
FLAME AND ENERGIZES THE SAFETY PORTION OF THE CONTROL. THE SWITCH
ACTION DE-ENERGIZES THE SPARK GAP AND ENERGIZES THE MAIN VALVE.
THE MAIN GAS IGNITES AND UNIT FIRES AT LOW RATE.
2. ON A CALL FOR HEAT BY THE HIGH STAGE OF THERMOSTAT, THE UNIT FIRES AT FULL RATE.
4. SET SYSTEM SWITCH AT "OFF" POSITION FOR SHUTDOWN.
FIRING SEQUENCE:
3. SET THERMOSTAT SYSTEM SWITCH AT "AUTO" POSITION.
(B) THE BLOWER OPERATES FROM THE FAN TIME DELAY.
(A) FIRING RATE IS CONTROLLED BY THE TWO STAGE THERMOSTAT.
5. SET SUMMER/WINTER SWITCH AT "ON" POSITION FOR CONTINUOUS
BLOWER OPERATION.
(A) BLOWER MOTOR REMAINS ON AS DETERMINED BY FAN TIME DELAY.
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 AND SUMMER/WINTER SWITCH
BY OTHERS: NONE
NONE
NOTES
A TEMPERATURE RATING OF AT LEAST 105° C. EXCEPT FOR
5. LINE AND BLOWER MOTOR BRANCH CIRCUIT WIRE SIZES SHOULD BE OF A SIZE
FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW).
ON 115/460V. UNITS THE CONTROL TRANSFORMER IS A SINGLE VOLTAGE PRIMARY.
9. ON 208/230V. UNITS THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY.
6. USE #14 GA. WIRE FOR LINE AND MOTOR WIRING ON 3 PHASE UNIT.
7. USE #12 GA. WIRE FOR LINE AND MOTOR WIRING ON SINGLE PHASE UNIT.
4. CAUTION: IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING
SENSOR LEAD WIRE WHICH MUST BE 150° C.
8. USE #18 GA. WIRE FOR 24 VOLT CONTROL WIRING ON UNIT.
FOR 230V. UNITS USE BLACK AND YELLOW LEADS (CAP RED).
FOR 115/460V. UNITS USE BLACK AND YELLOW LEADS.
TO PREVENT VOLTAGE DROP BEYOND FIVE PERCENT OF SUPPLY LINE VOLTAGE.
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.