Ground
• To prevent electrical shock, provide a ground with resistance less than 100 .
An electrician should do this work.
Do not connect the ground to the city water or gas piping. Do not tie the ground to a telephone line.
Breaker Installation
• Mount a device which shuts off the electrical path automatically (leakage breaker) when electrical leakage is detected.
• The electrical supply required by the system controller
is 120VAC at 60 Hz.
Use an appropriate circuit.
• Do not let the power cord contact the gas piping.
Tie the redundant power cord outside the system
controller. Putting the redundant length of cord inside
the system controller may cause electrical interference
and faulty operation.
Electrical Shock Hazard
Do not turn power on until electrical wiring is finished. Disconnect power before servicing.
Failure to do so may result in death or serious injury from electrical shock.
WARNING
Electrostatic discharge can affect electronic components. Take precautions to prevent electrostatic discharges from personnel
or hand tools during the system controller installation and servicing to protect the product’s electronic control.
CAUTION
• For instructions on connecting the power cord, refer to
the “Procedure of connecting the power cord to system
controller” sheet attached in the system controller.
Remote Controller Terminal Block
(Inside System Controller)
Remote controller cord
To remote controller
* There are two sets of remote controller terminals.
It is okay to connect to one or the other, but not both.
Only one remote controller may be connected.
Remote
controller 1
Remote
controller 2
System controller
1. Pass the remote controller cord through one (need to be cut to make a hole) of
the grommets in the base of the system controller. Connect the Y terminals to the
remote controller terminal block as shown below.
2. Install the remote controller as outlined in the water heater installation manual.
* Do not connect the communication cord from the units to the remote controller terminal block.
A malfunction will occur.
Connect the communication cord with the remote controller.
Connection with Remote controller
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