State MHEW2-40R-035D - Manual (Page 5)

5
Electrical Requirements
If you lack the necessary skills required to properly install
the electrical wiring to this water heater, do not proceed but
have a qualifi ed electrician perform the installation.
When making the electrical connections, always make
sure:
•
The electrical supply has the proper overload fuse or
breaker protection.
• Wire sizes and connections comply with all applicable
codes.
• Wiring enclosed in approved conduit (if required by
local codes).
• The water heater and electrical supply are properly
grounded.
Figures 3, 4, and 5 are provided as reference drawings
for the 120/240v 2-wire models only. Always reference
the wiring diagram located on the water heater for the
correct electrical connections and connect the electrical
supply to the water heater in accordance with local utility
requirements and codes.
When installing the electrical wiring to the water heater:
1. Be sure tank is completely filled with water before
making any electrical connections. (See Figure 2)
2. Disconnect the electric power.
3. Loosen the screw holding the junction box cover to the
top of the water heater and set aside.
4. Connect the electrical supply to the water heater.
A standard 1/2 inch opening has been made in the
junction box for conduit connections.
5. Connect ground wire to green ground screw in the
junction box of the water heater. Reinstall the junction
box cover.
Figure 3
120/240V 2-Wire Models
Junction Box
Cover
Ground
Wire
Conduit
White Wire (120V Models)
Red Wire (240V Models)
Black Wire
Green
Ground
Screw
Black
White
Approved Connectors
Figure 4
Wiring Diagram
120V Models Only
Overload
Protection
Neutral
Hot
Circuit
Breaker
To 120V
Power Supply
Electrical
Service Ground
Ground
Screw
Black
Red
Approved Connectors
Figure 5
Wiring Diagram
208/240v Models Only
Overload
Protection
To 208/240v
1 Phase
Power supply
Electrical
Service ground
L1
L2
Circuit
Breaker
Ground
Screw
NOTE: Applying electrical power to elements that are not submerged
in water will destroy them. The manufacturer will not warranty any
elements damaged in this manner.
Figure 2
Heating Element
WARNING
Electric Shock Hazard
Disconnect power before
servicing.
Replace all parts and panels
before operating.
Failure to do so can result in
death or electrical shock.
WARNING
Fire Hazard
Use proper size solid copper
wire.
Use a UL listed or
CSA approved strain relief.
Connect ground wire to green
ground screw.
Failure to do so can result in
death, fire, or electrical shock.