Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 25)

Form I-SC, P/N 207696 R11, Page 25
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°C, except
for sensor lead and optional bypass damper combustion air safety circuit (Option AG39 or
AG40) wires which must be 150°C. See Hazard Levels, page 2.
7
8
9
10
11
12
19
20
21
22
23
24
25
26
27
28
29
30
RELAY CONTACTS
TIME DELAY
& CAPACITOR
VENTER MOTOR
B C W
8
12
1
2
RELAY CONTACTS
TIME DELAY
4
11
2
R
Y W
BK
W
BK BK BK
7
7
BK BR 24
H TD H
BR
W 23
H TD H
BR
7
W
TIME DELAY
RELAY COIL
12 - 28
22
FAN
CONTROL TD
CR
22
7 BLOWER RELAY COIL
CUSTOMER'S 24 VOLT
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
BK Y
BR
7
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 126093 REV. #9
1, 2, 4, 7, 8, 10, 11,
12, B, C & W
TERMINAL
BLOCK --
HEATER
COMPARTMENT
SC: AH2/AH3
7
BR
BK
BL
SET ANT
. A
T 1.0 AMPS
OPTIONAL
SINGLE
ST
A
GE THERMOST
AT
R
W
MAIN
PILOT
OPERATING SEQUENCE
- SET THERMOSTAT AT LOWEST SETTING.
- TURN ON POWER, MAIN AND PILOT MANUAL GAS VALVES.
- SET THERMOSTAT AT DESIRED SETTING.
- ON A CALL FOR HEAT BY THE 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 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.
- SET THERMOSTAT AT LOWEST SETTING 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 SHOULD BE OF A SIZE
- DOTTED WIRING AND THE FOLLOWING CONTROLS ARE SUPPLIED AND INSTALLED BY OTHERS: STARTER COIL
- THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS: THERMOSTAT
- THE FOLLOWING CONTROLS ARE FACTORY INSTALLED OPTIONS: FAN CONTROL
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).
- USE #18 GA. WIRE FOR 24 VOLT CONTROL WIRING ON UNIT.
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°C, EXCEPT FOR
SENSOR LEAD WIRE WHICH MUST BE 150°C.
- BLOWER MOTOR OPERATES FROM FAN TIME DELAY.
(SEE NOTES)
REDUNDANT
GAS V
AL
VE
AL
TERNA
TE
W
.R.
OR R
OBER
TSHA
W
BL
P
BK
BR
MAIN
PIL
O
T
M
C
OR PV
TH-TR
TH OR
TR OR
PV-MV
PIL
O
T
MV
MAIN
HONE
Y
WELL
REDUNDANT
GAS V
AL
VE
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.
BK
BL
BK
IGNITION
CONTROLLER PROBE
GRND
SPARK
FLAME SENSING
MV/PV
MV
SENSE
TH
PV
G
BURNER
GND
BR
Y
- BLOWER MOTOR REMAINS ON AS DETERMINED BY FAN TIME DELAY.
CONTACTS
FAN TD
1 3
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)
M1(4) M2(5)
7.3 Typical Wiring Diagrams
FIGURE 24 - Model SC with Single-Stage Gas Control