HTP UFTC-140 - Page 43

LP-648 Rev. 002 Rel. 002 Date 9.16.20
43
Connector
Description HT SELV
No. of Location Pin Board Silk
CN7
LWD1140-14
1
F.S Flame Sensor
SELV (5V)
8
2
OP.S Operating Water Temperature Sensor
9
3
DH.S DHW Temperature Sensor
10
4
I.S NOT USED
11
5
BG.S Exhaust Temperature Sensor
12
6
ST.S NOT USED
13
7
SP.S Overheat Temperature Sensor
14
CN14
SMW250-09
1
DHM
GND
SELV (14V)
2 DHM Stepper Motor Position
3 VDD
4 DHM Stepper Motor Coil X Phase
5 DHM Stepper Motor Coil Y Phase
6 VDD
7 DHW Stepper Motor Coil / X Phase
8
DHM Power IWM Stepper Motor Coil
/ Y Phase
9 NOT USED -
CN3
SMW250-06
4
FLUX1
VCC
SELV (5V)
5 Water Flow Sensor
6 GND
CN5
SMW250-10
1
RPM
Fan RPM Check
2 GND
Table 22 - Boiler Wiring 2
Figure 35 - Terminal Block Wiring Detail