Electrical Installation - Maxwell MSxxxC2T series Installation And Instruction Manual

7. ELECTRICAL INSTALLATION

Please follow all electrical instructions carefully. This appliance must be installed by a licensed and
qualified electrician in accordance with all applicable national, state, provincial, and local electrical codes.
All wiring (wire gages), circuit breakers (protector), must comply with the US National Electrical Code
(NEC), in the USA, or the Canadian Electrical Code (CEC). Failure to do so could result in property
damage and/or personal injury and void your warranty.
The Canadian electrical code generally requires all wires and corresponding circuit breakers used to install
tankless water heaters shall be sized to a minimum of 125% of the maximum current rating of the water
heater. (See model specifications and details below).
Before installing this appliance make sure the house has sufficient electrical power available to handle the
maximum amperage load of the applicable model of your heater.
Required Breaker Size to be installed in the main electrical panel
Model No. MS120 MS150
Breakers for
Qty. 1 Qty. 2
Main
Elecrical
Double Double
Panel
Pole Pole
Without the
50 A
60 A
Sub-panel
Amperage requirementes are based on 240 v
Check your local electrical code requirements for different voltage applications
A. Make sure all power sources to the unit are disconnected before doing any connection to the terminal box
and working with it. Follow the wiring diagrams based on the unit you have purchased. All mounting and
plumbing installation must be completed before proceeding with the electrical installation.
B-1. MS120C2T_U must be connected to a single double pole breaker. Read all name plates carefully and wire as
per instructions, and table 1.
MS 180 MS210 MS240
Qty. 2 Qty. 3 Qty. 3
Double Double Double
Pole Pole Pole
50 A 40 A 40 A
11
Table 3
MS270
Qty. 3
Double
Pole
50 A