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AP18733 REV. 3.2.17
54
CONNECTOR
DESCRIPTION HT SELV
NO. OF LOCATION PIN BOARD SILK
CN9
65001WS-12
1 - EARTH GROUND -
2
L Power Supply Line HT (120V~)
3
CP1 Circulation Pump
4
IT Igniter
5
L(HT) UNUSED
6
GV Gas Valve
7
UNUSED
8
N
Power Supply Neutral
9-12
N
AC Power COM Line
CN1
SMW250-03
1
RS-485
RS485 + SELV (5V)
2
GND
3
RS485 -
CN4
LWD1140-06
1
FAN
Unused -
2
GND SELV (30V)
3
VDD SELV (14V)
4
Fan power (start coil)
SELV (30V)
5
Fan power (end coil)
6
Fan speed feedback signal
SELV (14V)
CN8
SMW250-04
1
MCU ISP
GND
SELV (5V)
2
ISP / Reset Port
3
ISP TOOL0 Data Port
4
VCC
CN11
1
HWL
Unused
SELV(12V~)
9
2
LWL Water Leak Sensor
10
3
HD Unused
11
4
TH
Connect to the Display Control
(Thermostat)
SELV (14V)
12
5
Condensate APS Condensate Air Pressure Switch
13
6
Flue APS Unused
14
7
BL Burner Limit
15
8
HL Water High Limit
16
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