Velocity Shadow Series, Installation And Operating Instructions Manual

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P3‐6
S7910B Display
R7910B Boiler Control
+V
J3‐A
J3‐A
‐V
J3‐B
J3‐B
MB1
MB2
Return Sensor
Supply Sensor
Spark
J1‐2
J9‐1
J9‐2
J9‐3
J9‐4
J9‐5
J9‐6
Wiring Legend
R7910B Boiler Control
AT140B
DHW Pump
Boiler Pump
System Pump
Gnd
J8‐3
J8‐2
J6‐3
J4‐10
J7‐7
J4‐12
J8‐1
J5‐1
J6‐2
J5‐2
Gas Valve
Sump
Press. Sw.
Ext.
Limit
T1‐5
P2‐4
CH T’stat
DHW T’stat
T1‐6
T1‐3 T1‐4
T1‐1 T1‐2
Flow
Sw.
J3‐ECOM1
J3‐ECOM2
J3‐ECOM3
Ignitor
Flame
Rod
Factory Wire Harness
Field wiring
Connector
Screw
Terminal
120VAC/60Hz/1Ph
L3‐1
J4‐4
J4‐2
J4‐6
J4‐3
J4‐5
J4‐7
Combustion Fan
(120V Conn.)
1 3
2
J8‐6
J8‐10
J8‐4
J8‐9
J8‐8
J8‐11
J8‐5
J10‐7
J10‐8
Outdoor
Temp
J6‐7
J6‐8
1
2
3
Flue Gas Sensor
1 (DC+)
2 (Tach.)
4 (PWM)
5 (DC‐)
J2‐3 (Fan PWM)
J2‐4 (DC‐)
J2‐1 (Tach.)
J2‐2 (DC+)
Combustion Fan
(DC Conn.)
T1‐8
T1‐7
Internal, non
replaceable 2 amp
J6‐1
L3‐2
L2‐1 L2‐3
Thermal
Fuse
Ground screw in
boiler J‐box
“Air Proving
Switch”
L
Wire Nut
N
P3‐7
P3‐8
P1‐1
P1‐2
P1‐4
P1‐3
P1‐5
P3‐5
P3‐2
P3‐4
P2‐1
P2‐3
P2‐2
P2‐6 P3‐9
P3‐1
P3‐12
P2‐5
P3‐10
P3‐3
P3‐11
P4‐5
P4‐4
P4‐1
P4‐11
P4‐10
P4‐2
P4‐7
P4‐8
P4‐12
P4‐9
P4‐3
P4‐6
Condensate
Trap
¼” Q.C.
PCB Trace/Components
Ground screw
on boiler frame
FIGURE 10.5: INTERNAL LADDER DIAGRAM