HTP RT-180 - Page 32

32
LP-505 REV. 4.29.14
CONNECTOR
DESCRIPTION
HT SELV
NO. OF LOCATION
PIN
BOARD SILK
CN9
65001WS-12
1
-
UNUSED
-
2
L
Power Supply Line
HT (120V~)
3
CP1
UNUSED
4
IT
Ignitor
5
L(HT)
Ceramic Heater (Freeze Protection)
6
GV
Gas Valve
7
EARTH GROUND
8
N
Power Supply Neutral
9-12
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
-
8
2
LWL
Unused
10
3
HD
Unused
11
4
TH
Connect to the Display Control
(Thermostat)
SELV (14V)
12
5
APS
Air Pressure Switch
13
6
EL
Unused
14
7
BL
Burner Limit
15
8
HL
High Limit
16
Table 18 – Water Heater Wiring 1