• MANUAL RESET. SRST-CN.C.)
AUTO. RESET. SPST-CN.C.)
ALS1 AUXILIARY LIMIT SWITCH. OVERTEMP,-
ALS2 AUXILIARY LIMIT SWITCH. OVERTEMP.-
BLWR BLOWER MOTOR RELAY. SPST-CN.O.)
BLWM BLOWER MOTOR
CAP CAPACITOR
CPU MICROPROCESSOR ANO CIRCUITRY
OSS DRAFT SAFEGUARD SWITCH
EAC-1 ELECTRONIC AIR CLEANER CONNECTION Cl 15 VAC 1 AMP MAX.)
EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FRSt FLAME ROLLOUT SWITCH OVERTEMP.-MANUAL RESET, 5P5T-(N.C.)
FR52 flame ROLLOUT SWITCH OVERTEMP.-MANUAL RESET. SPST-(N.C.)
F5E FLAME SENSING ELECTRODE
FUl FUSE, 3 AMP. AUTOMOTIVE BLADE TYPE. FACTORY INSTALLED
FU2 FUSE. FIELD INSTALLED
GV GAS VALVE-REDUNDANT OPERATORS
GVR MAIN GAS VALVE RELAY, DPST-CN.O.)
Hl/LO BLOWER MOTOR SPEED CHANGE RELAY. DPST-CN.O.)
HSl HOT SCWFACE IGNITER (US VAC)
HSIR HOT SURFACE IGNITER RELAY, DP5T-(N.O.)
HUM-t 24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.)
HUHR HUMIDIFIER RELAY. DPST-CN.O.)
I DM INDUCED DRAFT MOTOR
lOR INDUCED DRAFT RELAY. DPST-CN.O.)
ILK BLOWER DOOR INTERLOCK SWITCH. SPST-CN.O.)
JB JUNCTION BOX
JW9 INDUCER OFF DELAY JUMPER; CUT-15 SEC DELAY, UNCUT-5 SEC DELAY
LGPS LOW GAS PRESSURE SWITCH, SPST-CN.O.)
L5 LIMIT SWITCH. OVERTEMPERATURE-AUTO RESET. SPST-CN.C.)
PCB PRINTED CIRCUIT BOARD
_______________________________________________
PL1 U-CIRCUIT EDGE CONNECTOR (PCB)
PL2. 2-CIRCUIT HSI CONNECTOR
PL4 (-CIRCUIT FSE CONNECTOR
PL5 5-CIRCUIT BLWM CONNECTOR
PL5 2-CIRCUIT 115VAC CONNECTOR
PR5 PRESSURE SWITCH. SPST-CN.O.)
5T1-5T2 SELF TEST PINS
TP1-TP7 TEST POINT CD THRU C7)
TRAN TRANSFORMER-115VAC/24VAC
—•
-----
JUNCTION
O TERMINAL
— PCB TERMINAL
—■ ■" factory power wiring (115VAC)
-------
FACTORY CONTROL WIRING (24VAC)
— — — FIELD POWER WIRING C115VAC)
. CONDUCTOR ON PCB
0 FIELD WIRING SCREW TERMINAL
'•=# FIELD GROUND
EQUIPMENT GROUND
FIELD SPLICE
PLUG RECEPTACLE
TO 115VAC FIELD DISCONNECTIONS
N0TE#5
I EQUIPMENT GROUND
SCHEMATIC DIAGRAM
(NATURAL GAS 8 PROPANE)
N0TE*4
PL5
NOTES.
1. COMMON Sloe CSEC-2 AND C) OF 24VAC TRANSFORMER CONNECTED TO
GROUND THROUGH THIS REQUIRED MOUNTING SCREW.
2. IF ANY OF THE ORIGINAL WIRE. AS SUPPLIED, MUST BE REPLACED.
USE THE SAME OR EQUIVALENT TYPE WIRE.
3. INDUCER (iOM) AND BLOWER (BLWM) MOTORS CONTAIN INTERNAL
AUTO-RESET THERMAL OVERLOAD SWITCHES.
4. BLOWER MOTOR SPEED SELECTIONS CPL5) ARE FOR AVERAGE CONDITIONS;
SEE INSTALLATION INSTRUCTIONS FOR DETAILS ON OPTIMUM SPEED.
SELECTION.
5. USE ONLY COPPER WIRE BETWEEN THE DISCONNECT SWITCH AND THE UNIT.
6. AUXILIARY LIMIT SWITCHES (ALS1 8 2) USED ON DOWNFLOW MODELS ONLY.
7. BLOWER MOTOR (BLWM) ADJUSTABLE OFF-DELAY.
0. JW9 SHOULD BE LEFT UNCUT.
3. FACTORY CONNECTED WHEN LGPS NOT USED.
10. SYMBOLS ARE AN ELECTRICAL REPRESENTATION ONLY.
__________________________________
3T8975-401 REV. 1
A92048
Fig. 10—Unit Wiring Diagram
(1.) Remove regulator adjustment seal cap. (See Fig. 11.)
(2.) Turn adjusting screw counterclockwise to decrease
input. Turn screw clockwise to increase input. DO
NOT set manifold pressure less than 3.2- or more than
3.8-in. wc for natural gas. Make any major adjust
ments by changing main burner orifices.
(3.) When correct input is obtained, replace regulator seal
cap. Main burner flame should be clear blue, almost
transparent. (See Fig. 12.)
11
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