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4. Installation
4.9 Electrical Connections
4.9.1. Control unit
The boiler is not polarity sensitive. The boiler is fully
pre-wired. The boiler comes with a 6'/2 m power cord,
with a 3-prong power supply cable/plug. All external
connections can be made on the connection terminal
strip (low voltage). The main characteristics of the
control unit are described in the table below.
Power supply voltage
Rating of the main fuse F1
Fuse rating F2
Fan
CAUTION
Unearthed networks must be earth grounded/bonded.
CAUTION
The following boiler components are at a voltage of
120 VAC:
•
Electrical connection of the heating pump (CH).
•
Electrical connection of the combined gas valve
unit.
•
Electrical connection of the fan.
•
The majority of components in the control panel.
•
Ignition transformer.
•
Connection of the power supply cable.
CAUTION
•
When the power supply cable has to be replaced,
it must be ordered from DDR Americas Inc.
•
The boiler plug must be accessible at all times.
It is possible to connect various controls, safety and
regulation systems to the boiler. The standard control
PCB can be extended with:
For the optional PCBs, see chapter: "Optional
electrical connections", page 59-62
MCA-Pro ISM Rv.4.1 2/2017
120 VAC/60Hz
6.3 A
2 A
120 VAC
MCA Pro 45/65/90/115
4.9.2. Recommendations
WARNING
•
Always make sure that the power has been
turned off before starting any electrical work.
•
Only qualified professionnals may carry out
electrical connections, always with the power off.
•
The boiler is entirely pre-wired. Do not modify
the connections inside the control panel.
•
Ground the boiler in accordance with the
requirements of the authority having jurisdiction,
or in the absence of such requirements, with the
National Electrical code ANSI/NFPA 70 and or
the Canadian Electrical Code Part I, CSA 22.1,
Electrical Code.
•
Ground the appliance before making any
electrical connections.
Make the electrical connections of the boiler according
to:
•
The instructions of the prevailing standards
•
The instructions on the electrical diagrams provided
with the boiler.
•
The recommendations in the instructions.
CAUTION
Separate the sensor cables from the 120 V circuit
cables.
51
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