Takagi T-H3M-IN/OS - Manual (Page 23)

23
Page
Installation
Installation 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