American Standard TCWH-199-AS Installation Start-Up Maintenance Parts page 48

TANKLESS WATER HEATER
NO. OF LOCATION
CN9
65001WS-12
CN1
SMW250-03
CN4
LWD1140-06
CN8
SMW250-04
CN11
Table 19 – Water Heater Wiring 1
48
CONNECTOR
PIN BOARD SILK
1 -
2 L
3 CP1
4 IT
5 L(HT)
6 GV
7
8 N
9-12 N
1
RS-485
2
3
1
2
3
FAN
4
5
6
1
2
MCU ISP
3
4
1
HWL
8
8
LWL
10
3
HD
11
4
TH
12
5
Condensate APS
13
6
Jumper
14
7
BL
15
8
HL
16
DESCRIPTION
UNUSED
Power Supply Line
UNUSED
Ignitor
Ceramic Heater (Freeze Protection)
Gas Valve
EARTH GROUND
Power Supply Neutral
AC Power COM Line
RS485 +
GND
RS485 -
Unused
GND
VDD
Fan power (start coil)
Fan power (end coil)
Fan speed feedback signal
GND
ISP / Reset Port
ISP TOOL0 Data Port
VCC
Unused
Unused
Unused
Connect to the Display Control
(Thermostat)
Condensate Air Pressure Switch
Jumper
Burner Limit
Water High Limit
HT SELV
-
HT (120V~)
SELV (5V)
-
SELV (30V)
SELV (14V)
SELV (30V)
SELV (14V)
SELV (5V)
-
SELV (14V)