21
Warning
Maximum current of blue wire (C
1
) is 3
Amps, with all pumps running. Current
in excess of 3 Amps, may damage the
board, and void the warranty.
Primary Pump
POWER SUPPLY
Black
Electrical Box
15 AMP FUSED
120/1/60
120V WIRING
Green
Blue
White
Contacts that energize
these inputs
MUST BE DRY
CONTACTS ONLY
N
O
5V WIRING
T
A
C
D
CAUTION
T
h
e
r
m
o
s
t
a
t
R
W
Outdoor
Probe
Flow Switch
7.1 Simplified Wiring Connections
Heat and Indirect Wiring
Combi Wiring
The boiler must be electrically grounded in accordance with the National Electrical Code ANSI/NFPA 70, or local codes, and/or the
Canadian Electrical Code CSA C22.1.
Warning!!! A bad installation could ruin the Sentry
Board and void your warranty.
• Before providing 120 Volts to the boiler, do a continuity check between all wires and ground to make sure that there are no electrical
leaks that could damage the board.
• Before providing 120 Volts to the boiler, do a polarity check of the line and neutral wires, line must be connected to black and neutral
must be connected to white.
• Do not use magnetic tip screwdriver near the Sentry board.
• Verify that the wires connected to the Sentry TC and AC terminals are not grounded, or have any voltage applied to them, or voltage
to ground (dry contact closure only).
• Ensure that the probe wire is not damaged.
• Caution: Label all wires prior to disconnecting them when servicing controls. Wiring errors can cause improper and dangerous
operation
Aquastat
Indirect
Green
Purple
Electrical Box
Blue
Black
N
120/1/60
15 AMP FUSED
POWER SUPPLY
CAUTION
White
Circulator
* Indirect
120V WIRING
Primary Pump
5V WIRING
C
A
D
O
T
Probe
Outdoor
W
T
h
e
r
m
o
s
t
a
t
R
Contacts that energize
these inputs
MUST BE DRY
CONTACTS ONLY
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