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Benchmark Series Boilers Pre-Installation Electrical Power Guide
1. GENERAL
Benchmark (BMK) Gas Fired Boilers are fully factory wired packaged units which require simple
external power wiring as part of the installation (Figure 1). This technical guide is intended to help
designers provide electrical power wiring (line voltage) to Benchmark units. Control wiring details are
provided in other publications, depending upon unit application. This document is intended only as a
guide and therefore cannot include all possible alternatives or unit applications. In order to comply
with all codes and authorities having jurisdiction, designers and installers must plan the electrical
wiring carefully and execute the installation completely. Emergency shutoffs, fusible fire switches,
break glass stations, and other electrical requirements should be considered and installed whenever
necessary.
2. BOILER ELECTRICAL REQUIREMENTS
Benchmark boilers are available with the following power options:
BMK Model
BMK750 – 1000 Domestic
BMK750 – 1000 International
BMK1500 – 2000 Domestic
BMK1500 – 2000 International
BMK2500 - 3000 Domestic
BMK2500 - 3000 International
BMK4000 – 5000N Domestic
BMK4000 – 5000N International
BMK5000 - 6000 Domestic
BMK5000 - 6000 Canada
BMK5000 - 6000 International
Voltages lower than those specified in the table above will result in increased wear and premature
failure of the blower motor. Wire size and type should be made per the National Electrical Code based
on length and load.
For all Benchmark models, the power box for field wiring connections is located in the upper right
corner behind the unit front panel. All copper wire must be connected to the power box.
Figure 1: Service Disconnect Switch Typical Location
TAG-0048_Q • 5/16/2023
Voltage
120 V
220 V
120 V
220 V
208 V
480 V
380-415 V
208 V
480 V
380-415 V
208 V
480 V
575 V
380-415 V
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Phase
Amperage
1 / 60 Hz
1 / 50-60 Hz
1 / 60 Hz
1 / 50-60 Hz
3 / 60 Hz
3 / 60 Hz
3 / 50-60 Hz
3 / 60 Hz
3 / 60 Hz
3 / 50-60 Hz
3 / 60 Hz
3 / 60 Hz
3 / 60 Hz
3 / 50-60 Hz
Service Disconnect
Switch
15
20
20
20
20
15
15
40
20
20
30
20
20
20
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