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The T‐H2‐DV/T‐H2‐OS 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 199,000 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‐H2‐DV/T‐H2‐OS 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.
• The T‐H2‐DV/T‐H2‐OS 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. As an option, Takagi offers the TH‐NT01
Neutralizer assembly (sold separately).
• In the absence of applicable local codes and regulations, TAKAGI 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 T‐H2‐DV/T‐H2‐OS to a standard drain.
• Follow all code requirements
of the local authority on
condensate neutralizers and
whether or not they are
required for the installation.
PRESSURE RELIEF VALVE
CONDENSATE DRAIN
20
│
As Close as
Possible
Pressure
Relief Valve
Condensate drain port
Page
Installation
Cold
Hot
Gas
inlet
outlet
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