Takagi T-M32 - Manual (Page 18)

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PRESSURE RELIEF VALVE
The Mobius T-M32 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.
1. This unit does not come with an approved pressure relief valve.
2. An approved pressure relief valve must be installed on the hot water outlet.
3. The pressure relief valve must conform to ANSI Z21.22 or CAN 1-4.4 and installation must
follow local code.
4. The discharge capacity must be at least 240,000 BTU/h.
5. The pressure relief valve needs to be rated for a maximum of 150 psi.
6. The discharge piping for the pressure relief valve must be directed so that the hot water
cannot splash on anyone or on nearby equipment.
7. 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.
8. If the pressure relief valve installed on the T-M32 discharges periodically, this may be due
to a defective thermal expansion tank or defective pressure relief valve.
9. The pressure relief valve must be manually operated periodically to check for correct
operation.
10. For the T-M32 ASME model, the pressure relief valve must conform to and be installed in
accordance with ASME code.
As Close as
Possible
Pressure Relief
Valve
Cold inlet Hot outlet Gas