Benchmark Series Boilers Pre-Installation Electrical Power Guide
TAG-0048_P
•
GF-2060
•
8/6/2020 Technical Support
•
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4.
Boiler Wiring
A dedicated protected circuit should be provided from the power source to the boiler. No other
electrical devices should be permanently wired on the same circuit.
The protected circuit and circuit
breaker switch must be sized for the amperage values below.
An emergency switch (electrical shutoff) must be wired in series with power to the unit. Connecting an
emergency shutoff switch (E-stop) to the main power terminals of the boiler is the recommended and
safest way to totally disable and un-power the unit. Use of the remote interlock, located on the I/O
board, is not recommended since it does
not
cutoff power within the unit, it only disables it. Under no
circumstance should the remote interlock of the BST Manager unit be used as an emergency switch
for the plant.
The following table lists the input power requirements for all Benchmark boilers, including the diagram
number of each model’s corresponding schematic d
iagram:
DOMESTIC UNITS
INTERNATIONAL UNITS
BMK Model Diag. Voltage/Phase/Frequency Amps Wires Diag. Voltage/Phase/Frequency Amps Wires
750
–
1000
1a
120V / 1
/ 60 Hz@
15 A
3
1b
220V / 1
/ 50- 60 Hz
20 A
3
1500
–
2000
20 A
2500/3000
2
208V / 3
/ 60 Hz
20 A
5
3a
480V / 3
/ 60 Hz
15 A
4
3b
380-415V / 3
/ 50- 60 Hz
15 A
4
4000/5000N
7
208 V / 3
/ 60 Hz
40 A
4
6a
480V / 3
/ 60 Hz
20 A
4
6b
380-415V / 3
/ 50- 60 Hz
20 A
4
5000/6000
4
208V / 3
/ 60 Hz
30 A
4
5a
480V or 575V / 3
/ 60 Hz
20 A
4
5b
380-415V / 3
/ 50-60 Hz
20 A
4
For applicable wiring connections, refer to the schematic diagrams below.
Diagram 1a - BMK750
–
2000: 120 V / 1
/ 60 Hz Wiring Schematic
–
3 Wire
–
DOMESTIC
120 V / 1
/ 60 Hz
DISCONNECT SWITCH
1 POLE 20 AMP
1 POLE 20 AMP
CIRCUIT BREAKER
