Harsco Industrial C1500H Installation & Owner's Manual page 14

NOTICE! A dedicated earth ground (green wire) is required to avoid nuisance shutdowns. Do not ground through
the conduit.
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C1500H/C2000H/C2500 boilers require 120 volts, single phase, 60 hertz electrical service.
MACH
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The MACH C3000/C4000 boilers require either 208VAC/ 240VAC OR 480VAC three phase, 60 hertz
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NOTE: MACH C3000/C4000 boilers must be ordered as either 208/240VAC or 480VAC THIS IS NOT FIELD
CONFIGURABLE.
If 208 VAC is used the step down transformer must be reconfigured for 208VAC by changing the connection on the
transformer located inside of the power input junction box (see MACH
configuration).
The total operating amperage is indicated on the rating nameplate. Before starting the boiler, check to ensure that the
proper electrical service is connected to the boiler.
An external electrical disconnect (not supplied with the boiler) is required. 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 Canadian Electrical Code, Part I,
CSA C22.1, latest edition. Installed conduit must not block openings and must allow the side doors to be opened.
The electrical junction boxes are located at the upper front sides of the boiler.
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The MACH C3000/C4000 boilers have an added electrical junction box at the
lower front left side.
3.4.1 Power Input Junction Box MACH
The main power connections are connected to the over current safety device
rated for a 20 Amp 3 phase circuit (for either 208-240 or 480VAC) and ground
terminal located in the main power connection box. This box is located at the
lower front left side of the boiler. The power connection has four points of
contact: Terminals 1, 3, 5 and G. Connect the three wires supplying the three
phase power to terminals 1, 3 and 5. Connect the main boiler ground wire to
G.
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C3000/C4000 boilers internal control transformer is pre-wired
The MACH
from the factory for operation with 240 VAC or 480VAC. If 208 VAC three
phase power is used on the 240VAC model, the internal control transformer
must be wired for operation at this lower voltage. The wire in terminal X3 on
the load side of the internal control transformer must be moved to terminal X4.
This supplies the 120 VAC power to the controls from the 208 VAC main
voltage. Refer to Sections 6.1.4 and 6.1.5 for proper wiring and configuration
of the internal control transformer.
3.4.2 Power Input Junction Box or Terminal Block 2 (TB2) MACH
The main power connection is made within the TB2/HV terminal block to terminals:
1 - 120VAC LINE L1+
2 - 120VAC NEUTRAL N1 -
8 - GROUND G
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C3000/C4000 Boilers
14
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boiler transformer wiring diagrams for proper
Power Input Junction Box
For the C3000 and C4000
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C1500H/C2000H/C2500 Boilers
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MACH Gas Fired Boiler