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11 PIN FUNCTIONS
# DESCRIPTION
1
FLAME SENSOR
2
PRESSURE OUT
3
(SEE 11 PIN DETAIL)
4
PRESSURE IN
5
GAS VALVE GND
6
LIMIT OUT
7
(SEE 11 PIN DETAIL)
8
LIMIT IN
9
(SEE 11 PIN DETAIL)
10
GAS VALVE OUT
11
(SEE 11 PIN DETAIL)
TWIN TERMINAL
CONNECT TO ANOTHER 50M56U-751
HUMIDIFIER
120VAC
ELECTRONIC
AIR CLEANER
IGNITOR
INDUCER
TRANSFORMER
PIN 3: NOT CONNECTED
BLU
(WHEN USED)
GAS VALVE
LS2
FRS2
RED
(WHEN USED)
(WHEN USED)
BVSS
DSS
LS1
FRS1
RED
GRN/YEL
LPS
LGPS
(WHEN USED)
ORG
WHT
FLAME SENSOR
THERMOSTAT
RED
SEC-1
BLU
SEC-2
WHT
BLW
WHT
NEUTRAL
WHT
EAC-2
WHT
IGN
WHT
IND
WHT
PR-2
L2
11 PIN WIRING DETAIL
PIN 3: HOUSING PRESSURE SWITCH INPUT
11
10
9
(WHEN USED)
LS2
8
7
(WHEN USED)
(WHEN USED)
BVSS
6
5
LPS
4
3
YEL
2
1
HUMIDIFIER
24VAC
24V HUM
120V HUM
PR-1
L1
PL2
11
BLU
10
WHT
9
GAS VALVE
FRS2
RED
8
WHT
7
DSS
LS1
FRS1
RED
6
GRN/YEL
5
LGPS
(WHEN USED)
ORG
4
HPS
BRN
3
YEL
2
WHT
1
FLAME SENSOR
WIRING DIAGRAM
LEGEND
BVSS
Blocked Vent Shutoff Switch, Manual-reset, SPST -(N.C.)
DSS
Dra Safeguard Switch
FRS1,2 Flame Rollout Switch - Manual Reset, SPST-(N.C.)
HPS
Housing Pressure Switch, SPST-(N.O.)
LGPS
Low Gas Pressure Switch, SPST-(N.O.)
LPS
Pressure Switch, SPST-(N.O.)
LS1,2
Limit Switch - Auto Reset, SPST (N.C.)
STATUS LED
FAULT RECALL PUSH BUTTON
DIPSWITCHES
SW1-1
SW1-2
SW1-3&4 HEAT OFF DELAY
BLK
BLU
RED
YEL
EAC-1
SPARE-3
SPARE-2
CIRCULATOR
PIN 3: INDUCER GROUND
(WHEN USED)
LS2
FRS2
(WHEN USED)
(WHEN USED)
BVSS
DSS
LPS
INDUCER
HEAT ON DELAY
FAN SPEED
FLAME
CURRENT
SENSE
1VDC=1µA
11
BLU
10
WHT
9
GAS VALVE
RED
8
WHT
7
LS1
FRS1
RED
6
GRN/YEL
5
LGPS
(WHEN USED)
ORG
4
GRN/YEL
3
YEL
2
WHT
1
FLAME SENSOR
5
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