Takagi T-M50 - Manual (Page 19)

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WATER CONNECTIONS
・ Do not use this water heater if any part has been submersed under water. Immediately call a
licensed professional to inspect the water heater and to replace any damaged parts.
・Do not reverse the hot outlet and cold inlet connections to the water heater. This will not
activate the water heater.
All pipes, pipe fittings, valves and other components, including soldering materials, must be
suitable for potable water systems.
1. All pipes, pipe fittings, valves and other
components, including soldering materials, must
be suitable for potable water systems.
2. 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 water heater.
3. 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 system, a thermal
expansion tank must be installed.
4. 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.
5. 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.
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 380,000 BTU/h.
 The pressure relief valve needs to be rated for a maximum of 150 psi.
 The discharge piping for the pressure relief valve must be directed so that the hot water
cannot splash on anyone 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 water heater discharges 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.
 No valve must be placed between the relief valve and the water heater.
 When ASME model is installed, the pressure relief valve should be conformed and
installed in accordance with ASME code.
 For the ASME model, the pressure relief valve must conform to and be installed in
accordance with ASME code.
FOR YOUR SAFETY, READ BEFORE OPERATING:
Pressure
Relief
Valve
Gas
Cold inlet
Hot out
Cold inlet
Pressure
Relief
Valve
Gas Hot out
As Close as
Possible