Takagi T-H3M-DV - Pressure relief valve; CONDENSATE DRAIN

23 Page
Installaon
Installaon Manual
Follow all code requirements
of the local authority on
condensate neutralizers and
whether or not they are required
for the installation.
Condensate drain port
-Pressure relief valve-
The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a
Hi-Limit switch) therefore a “pressureonly” relief valve is required.
• This water heater 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
codes.
• The discharge capacity must be at least 120,000 BTU/h for the 140 (T-H3M) models.
• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).
• The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash
on anyone or on nearby equipment. Follow local codes.
• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 inches
(152 mm) 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, defective pressure relief valve, or it could be signs of internal scale
build up.
• The pressure relief valve must be manually operated periodically to check for correct operation.
• No valves may be placed between the relief valve and the water heater.
CONDENSATE DRAIN
• The water heater does not include a built-in condensate neutralizer cartridge for reducing the pH level
of condensate water. If local codes dictate that condensate must be neutralized prior to drainage, a
condensate neutralizer must be installed. An accessory Neutralizer assembly is sold separately.
• In the absence of applicable local codes and regulations, the manufacturer recommends that
condensate be disposed of into a standard drain. Connect a drain tube from the condensate drain port
(shown below) located on the bottom of the water heater to a standard drain.