Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 26)

Form I-SC, P/N 207696 R11, Page 26
FIGURE 25 - Model SC with Two-Stage Gas Control
7
8
9
10
11
12
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
& CAPACITOR
VENTER MOTOR
B C W
8
12
1
2
4
11
R
Y W
BK
W
BK BK BK
7
7
7
BK BR 24
H TD H
BR
BR
W 23
H TD H
BR
7
BK
BL
W
TIME DELAY
RELAY COIL
12 - 28
22
FAN
TD HEATER
CR
22
7 BLOWER RELAY COIL
CUSTOMER'S 24V.
8 VA. MAXIMUM
FACTORY WIRING
FIELD WIRING
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BROWN - BR
BLACK - BK
WIRING CODE
TOTAL WIRE MINIMUM RECOMMENDED
LENGTH WIRE SIZE
150 FEET #18 GA.
250 FEET #16 GA.
350 FEET #14 GA.
FIELD CONTROL WIRING
BK
13
R R
LOW STAGE
PILOT
HIGH STAGE
BK Y
BR
7
R
C
OPTIONAL
TWO
ST
A
GE THERMOST
AT
W1
DISCONNECT SWITCH
LINE/1/60
GRD
G
40 VA. CONTROL
TRANSFORMER
BK Y
BL BR
R
B W
LIMIT
CONTROL SWITCH
PRESSURE
COMBUSTION
NC
NO
COM
LINE VOLT
24V
10
Y
BL R
OPTIONAL FACTORY
WIRING
8
BL
WD 126687 REV. #8
1, 2, 4, 7, 8, 10, 11,
12, 13, B, C & W
TERMINAL BLOCK --
HEATER
COMPARTMENT
SC: AH2/AH3-AG2-CL22
OPERATING SEQUENCE
- SET THERMOSTAT SWITCH AT "OFF" POSITION.
- TURN ON POWER, MAIN AND PILOT MANUAL GAS VALVES.
- SET THERMOSTAT SWITCH AT "AUTO" POSITION.
- ON A CALL FOR HEAT BY THE LOW STAGE OF THERMOSTAT
- THE VENTER MOTOR IS ENERGIZED AFTER A 15 SECOND (APPROX.) TIME DELAY.
- VENTER FLOW SWITCH SWITCHES FROM N.C. TO N.O. CONTACTS ENERGIZING
THE PILOT GAS VALVE AND SPARK GAP 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.
- ON A CALL FOR HEAT BY THE HIGH STAGE OF THERMOSTAT, THE UNIT FIRES AT FULL RATE.
- SET THERMOSTAT SWITCH AT "OFF" POSITION FOR SHUTDOWN.
ON 115/460V. UNITS THE CONTROL TRANSFORMER IS A SINGLE VOLTAGE PRIMARY.
- ON 208/230V. UNITS THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY.
- USE #14 GA. WIRE FOR LINE WIRING ON UNIT.
TO PREVENT VOLTAGE DROP BEYOND FIVE PERCENT OF SUPPLY LINE VOLTAGE.
- LINE AND BLOWER MOTOR BRANCH CIRCUIT WIRE SIZE SHOULD BE OF A SIZE
- DOTTED WIRING AND THE FOLLOWING CONTROLS ARE SUPPLIED AND INSTALLED
- THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS:
- THE FOLLOWING CONTROLS ARE FACTORY INSTALLED OPTIONS:
FOR 115/460V. UNITS USE BLACK AND YELLOW LEADS.
FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW).
FOR 230V. UNITS USE BLACK AND YELLOW LEADS (CAP RED).
THERMOSTAT
- USE #18 GA. WIRE FOR 24 VOLT CONTROL WIRING ON UNIT.
BY OTHERS: STARTER COIL
FAN CONTROL
NOTES
- 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 DEGREES C., EXCEPT FOR SENSOR
LEAD WIRE WHICH MUST BE 150 DEGREES C.
- BLOWER MOTOR IS ENERGIZED FROM FAN TIME DELAY.
(SEE NOTES)
PIL
O
T
AL
TERNA
TE
W
.R.
T
WO
ST
A
GE
REDUNDANT
GAS V
AL
VE
R
BL
3
HIGH STG
4
BK
STG
2
LO
W
1
BR
HIGH STG
HI
PV
PIL
O
T
STG LO
W
C
MV
REDUNDANT
GAS V
AL
VE
HONE
Y
WELL T
WO
ST
A
GE
USE DUAL ELEMENTS TIME DELAY FUSES AND SIZE ACCORDING TO 1.25
TIMES THE MAXIMUM TOTAL INPUT AMPS.
- WHEN PROVIDING OR REPLACING FUSES IN THE FUSIBLE DISCONNECT SWITCH
- DISCONNECT SWITCH IS FIELD FURNISHED OR AVAILABLE FROM FACTORY AS AN OPTION.
CONTACTS
FAN TD
1 3
- BLOWER MOTOR REMAINS ON AS DETERMINED BY FAN TIME DELAY.
W2
BK
7
BL
BK
IGNITION
CONTROLLER PROBE
GRND
SPARK
FLAME SENSING
MV/PV
MV
SENSE
TH
PV
G
BURNER
GND
BR
Y
R
24V GND
GND BURNER
- 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 LOCKOUT CONTROL, IF PILOT IS NOT
ESTABLISHED WITHIN 120 SEC. THE UNIT LOCKS OUT FOR ONE
HOUR, UNLESS IT IS RESET BY INTERRUPTING POWER TO
THE CONTROL CIRCUIT. (SEE LIGHTING INSTRUCTIONS)
M3(1) M4(3)
VENTER TIME DELAY
RELAY CONTACTS
M1(4) M2(5)
RELAY CONTACTS
VENTER TIME DELAY
7.0 Electrical Supply and Connections (cont'd)
7.3 Typical Wiring Diagrams (cont'd)