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3.3 Electrical Connections
3.3.1 Power Requirements (CM300-CM399-CM500)
®
The P-K MACH
CM300, CM399 & CM500 boilers require 120 VAC, single phase, 60 hertz electrical
service. The MCA and MOCP are indicated on the rating nameplate. Before starting the boiler, check
to ensure that the proper electrical service is connected to the boiler. The total operating amperage is
indicated on the rating nameplate and the CM300, CM399 & CM500 boilers require less than 5 Amps at
full load.
Patterson-Kelley recommends a minimum circuit capacity of 10 amperes dedicated for the
boiler.
An external electrical disconnect and overload protection (not supplied with the boiler) are required.
Refer to Section
7.1
for proper wiring and configuration of the electrical connections. The boiler
electrical service must be installed and grounded in accordance with local codes or in the absence of
such requirements, in the U.S. with National Electrical Codes, ANSI/NFPA No. 70 latest edition or, in
Canada, to the current Canadian Electrical Code, Part I, CSA C22.1 latest edition. Installed conduit
must not block any of the boiler's openings and must allow the front door to be opened.
The low voltage (TB1) and high voltage (TB2) terminal boxes are located behind the front door of the
boiler, near the bottom surface of the enclosure as shown below:
NOTE:
These terminals can
accommodate maximum
10AWG wire.
Do not over-tighten the terminal
screws. Maximum tightening
torque = 6 in-lbs!
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
®
P-K MACH
Technical Service 1.877.728.5351
1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Gas Fired Boiler
Page 16
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