John Wood Takagi - 710 - Manual (Page 11)

11
Water Connections
Do not use this water heater if any part has been sub-
mersed under water. Immediately call a licensed profes-
sional to inspect the water heater and to replace any
damaged parts.
FOR YOUR SAFETY, READ
BEFORE OPERATING
All pipes, pipe fittings, valves and other components,
including soldering materials, must be suitable for pota-
ble water systems.
A manual shut off valve must be installed on the cold
water inlet to the water heater between the main water
supply line and the 710.
In addition, a manual shut off valve is also recommended
on the hot water outlet of the unit. If the 710 is installed
within, or subjected to, a closed loop water system, a
thermal expansion tank must be installed.
Before installing the water heater, flush the water line
to remove all debris, and after installation is com-
plete, purge the air from the line. Failure to do so may
cause damage to the heater.
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.
CAUTION
Do not reverse the hot outlet and cold inlet
connections to the 710 Water Heater. This
will not activate the water heater.
Pressure Relief Valve
The 710 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 240,000 BTU/
h.
1.
2.
3.
4.
5.
1.
2.
3.
4.
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 6" from the floor. This
discharge tube must allow free and complete drainage
without any restrictions.
If the pressure relief valve installed on the 710 discharg-
es periodically, this may be due to a defective thermal
expansion tank or defective pressure relief valve.
The pressure relief valve must be manually operated
periodically to check for correct operation.
For the ASME model, the pressure relief valve must con-
form to and be installed in accordance with ASME code.
As close as
possible
Pressure
Relief
Valve
Hot outlet Cold inlet Gas
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
710, label all wires prior to disconnection to
facilitate an easy and error free reconnec-
tion. Wiring errors can cause improper and
dangerous operation. Verify proper opera-
tion after servicing.
The heater must be electrically grounded. Do not attach
the ground wire to either the gas or the water piping.
The 710 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 710 must be pro-
vided for service reasons. (Must comply with local codes).
•
Connect the power supply to the 710 exactly as
shown in the wiring diagram;
5.
6.
7.
8.
9.
1.
2.