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L
P2‐1
P5‐2
T1‐5
P3‐5
Ext.
Limit
Note: DHW Thermostat
Terminals (#3 & #4) are not
shown and are not used.
Wiring Legend
Factory Wire Harness
PCB Trace/Components
Field wiring
Connector
Screw
Terminal
Wire Nut
107774-01- 9/17
XI. Wiring
R7910B Boiler Control
J4‐6
6.3A Slo
Blow In‐
Line Fuse
P1‐2
J4‐4
J4‐2
Combustion Fan
(120V Conn.)
1
P3‐8
Internal, non
replaceable 2 amp
L2‐1
AT140B
L3‐1
CH T'stat
T1‐1
T1‐2
P2‐4
DHW
Flow Sw.
DFS‐3
DFS‐2
P5‐5
Thermal
Sump
Boiler
Fuse
P2‐6 P3‐9
Press. Sw.
Flow Sw.
T1‐6
"Air Proving
Switch"
P3‐1
EnviraCOM
Connections (if used)
Return Sensor
Supply Sensor
DHW Sensor
Flue Gas Sensor
Figure 11.6: Internal Ladder Diagram
(continued)
120VAC/60Hz/1Ph
J4‐7
P1‐5
System Pump
J4‐5
P5‐1
BP‐1
BP‐2
Boiler Pump
J4‐3
P5‐7
ZV‐1
ZV‐2
3‐Way Zone Valve
3
2
L2‐3
L3‐2
J8‐1
J8‐2
J4‐10
J8‐3
J4‐12
Spark
J1‐2
J7‐7
R7910B Boiler Control
J6‐1
P3‐6
J5‐1
J5‐2
P3‐12
J6‐3
J6‐2
J2‐1 (Tach.)
J6‐7
J2‐2 (DC+)
J6‐8
J2‐3 (Fan PWM)
J3‐ECOM1 (D)
J2‐4 (DC‐)
J3‐ECOM2 (R)
J10‐7
J3‐ECOM3 (C)
J10‐8
J8‐11
P4‐10
J8‐4
P4‐11
J8‐5
J8‐6
P4‐1
J8‐8
P4‐4
J8‐9
J3‐A
P4‐7
J3‐B
J8‐10
MB1
+V
P5‐9
J9‐1
P5‐6
J9‐2
J9‐3
J3‐A
J3‐B
MB2
‐V
P4‐2
J9‐4
P4‐5
J9‐5
P4‐8
J9‐6
N
Gnd
Ground screw in
boiler J‐box
P1‐1
P5‐4
P3‐7
Ground screw
on boiler frame
P3‐10
P3‐3
Ignitor
P3‐11
P3‐2
P3‐4
¼" Q.C.
Condensate
Trap
Gas Valve
P4‐6
1 (DC+)
2 (Tach.)
P4‐3
Combustion Fan
P4‐9
4 (PWM)
(DC Conn.)
5 (DC‐)
P4‐12
T1‐8
P2‐2
Outdoor
P2‐3
T1‐7
Temp
SD+
SD‐
Panasonic
RD+
GT02
RD‐
Display
+5V
‐5V
ModBus Connections
(if used)
Flame
Rod
87
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