John Wood Takagi - 110-310-510 - Manual (Page 16)

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2. In addition, a manual shut off valve is also recommended
on the hot water outlet of the unit. If the water heater is
installed within, or subjected to, a closed loop water sys-
tem, a thermal expansion tank must be installed.
3. Before installing the water heater, flush the water line
to remove all debris, and after installation is complete,
purge the air from the line. Failure to do so may cause
damage to the heater.
4. There is a wire mesh filter within the cold inlet to trap
debris from entering your heater. This will need to be
cleaned periodically to maintain optimum flow.
Hot outlet Cold intlet Gas intlet
As close as
possible
Pressure
Relief Valve
Pressure Relief Valve
The water heater has a high-temperature shut off switch
built in as a standard safety feature (called a Hi-Limit switch)
therefore a “pressure only” relief valve is required.
This unit does not come with an approved pressure relief
valve.
An approved pressure relief valve must be installed on
the hot water outlet.
The pressure relief valve must conform to ANSI Z21.22
or CAN 1-4.4 and installation must follow local code.
The discharge capacity must be at least 140,000 BTU/h
for the 110, 190,000 BTU/h for the 310, and 199,000
BTU/h for the 510.
The pressure relief valve needs to be rated for a maxi-
mum of 150 psi.
The discharge piping for the pressure relief valve must
be directed so that the hot water cannot splash on any-
one or on nearby equipment.
Attach the discharge tube to the pressure relief valve and
run the end of the tube to within 150mm (6 in.) from the
floor. This discharge tube must allow free and complete
drainage without any restrictions.
If the pressure relief valve installed on the water heater
discharges periodically, this may be due to a defec-
tive thermal expansion tank or defective pressure relief
valve.
The pressure relief valve must be manually operated
periodically to check for correct operation.
No valve must be placed between the relief valve and the
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Electrical Connections
WARNING
Follow the electrical code requirements of
the local authority having jurisdiction. In
the absence of such requirements, follow
the latest edition of CSA C22.1 Canadian
Electrical Code, Part 1.
CAUTION
When servicing or replacing parts within the
water heater, label all wires prior to discon-
nection to facilitate an easy and error-free
re-connection. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
1. The water heater must be electrically grounded. Do not
attach the ground wire to either the gas or the water pip-
ing.
2. The water heater requires 120 VAC, 60 Hz electrical
power supply that is properly grounded.
A proper disconnect (i.e. on/off switch, power plug,
etc.) controlling the main power to the water heater
must be provided for service reasons. (Must comply
with local codes).
Connect the power supply to the water heater exact-
ly as shown in the wiring diagram.
3. A green screw is provided in the junction box to ground
the connection.
4. Can be hardwired or wired to a plug-in.
5. The use of a surge protector is recommended in order to
protect the unit from power surges.
Bottom view of water heater
Connect Power supply
120 VAC, 60 Hz
Green screw Ground
View of electrical
connections of water heater
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