
LP-517 Rev. 000 Rel. 019 Date 7.21.20
34
Internal Connection Diagram
POWER
SWITCH
SUPPLY
X7-2
X7-12
HIGH GAS
PRESSURE
X6-8
X7-1
CONDENSATE
FULL
LOW GAS
PRESSURE
DHW TANK
OUTDOOR
J1-10
J1-11
J1-12
J1-13
J1-14
J1-15
0-10 VOLT
+
-
J1-16
J1-17
TT TERMINALS
J3-3
J3-4
J3-5
J4-3
J4-4
RS485 BUS
RS485 BUS
X-13
RIBBON CABLE
ORANGE
SPARK CABLE TO SPARK ELECTRODE
TEXT DISPLAY
X5-9
120 VAC
LINE
F3
J4-5
*
*
*
928
CONTROL
X7-15
X7-5
X6-18
X6-9
J5-6
J5-7
X5-2
J5-8
X5-1
J5-2
X5-14
J5-4
X6-2
J5-3
X5-8
X5-6
J5-1
X10-6
J6-8
J6-7
X10-4
F2
J2-4
J2-5
J2-2
J2 NEUT
J2 GND
F4
3
-
7
J
0
2
1
-
2
J
J7-1
J6-2
X11-1
J8-3
J8-4
G
H
J2-6
J2-1
J2-3
DHW
PUMP
BOILER
PUMP
N
J10-2
J10-3
J10-1
CR1
CR1
ALARM
*
*
MAX 6 AMPS/120 VAC. TOTAL USE CONTACTOR IN PLACE OF PUMP FOR GREATER DRAW.
X6-1
J5-5
J6-1
X11-4
J6-3
X11-2
OPTIONAL
UL353
LWCO
X6-6
X6-7
X6-15
X6-16
X9-1
X9-4
120V
GAS VALVE
BVPS
X6-17
X7-4
X7-14
BLOWER L
B
A
G
B
A
G
PWM
+24V
GND
HALL
X7-11
X7-10
X7-20
FLUE
X5-15
X5-16
DUAL
X7-3
X7-13
A
B
FLUE
ECO
X7-9
X7-19
MAN. RESET
HIGH WATER TEMP
J2-8
J2-9
SYS
PUMP
*
J2-7
**
J9-19
J9-18
J9-25
J9-24
J9-21
J9-20
SYSTEM
0-10 VA -
0-10 VA +
EXT. LWCO -
EXT. LWCO +
J5-10
J5-9
J5-16
J6-15
J5-12
J5-11
X5-13
X5-7
X6-14
X6-5
X7-17
X7-7
X11-1
X11-2
X11-3
X11-4
BLOWER N
928 X10-7
BLOWER L
928 X10-8
BLOWER
MOTOR
X12-1
X12-2
X12-3
X12-4
J8-1
J8-2
J8-4
TRANSFORMER
BELIMO
OPTIONAL
*
*
FLOW SWITCH
J6-4
X8-2
X8-1
J6-6
F1
X10-1
BLOWER N
*
*
BURNER SENSOR
X6-10
X6-11
Figure 26 - Internal Connection Diagram