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Refer to the pressure relief valve
manufacturer's instruc ons for
inspec on and maintenance
requirements.
6" (152.4 mm)
Maximum
Figure 35 - Discharge Pipe
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.
• An approved pressure relief valve is
supplied with the X3® models. An
approved pressure relief valve shall
be fi eld supplied for the M models.
• The discharge piping for the pres-
sure relief valve must be directed
so that the hot water cannot splash
outward and cause damage or per-
sonal injury.
• A ach the discharge tube to the
pressure relief valve and run the end
of the tube to within 6 in (152 mm)
from the fl oor. This discharge tube
must allow free and complete drain-
age without any restric ons.
• If the pressure relief valve discharg-
es periodically, this may be due
to thermal expansion in a closed
water supply system. Contact the
water supplier or a local plumbing
professional on how to correct this
situa on. Do not plug the pressure
relief valve.
• The pressure relief valve must be
manually operated periodically to
check for correct opera on. Before
opera ng the valve manually, check
that it will discharge in a place for
secure disposal.
• No valve must be placed between
the relief valve and the water heater.
• If another pressure relief valve is
used or needs to be replaced, it
must meet the following:
•
The pressure relief valve must
conform to local codes.
•
The discharge capacity must be
at least 199,000 BTU/h for the
THR-199 model, 180,000 BTU/h
for the THR-180 model,160,000
BTU/h for the THR-160 model,
•
The pressure relief valve needs
to be rated for a maximum of
150 psi (1 MPa).
Condensate Drain
• Follow all code requirements of the
local authority on condensate neu-
tralizers and whether or not they are
required for the installa on.
• Discharge condensate (acidic water)
in accordance with all local codes
and common safety prac ces.
• Install minimum 1/2" corrosion
resistant pipe, such as PVC, for the
condensate drain line. Do not use
metal pipe.
• The condensate drain does not
require a trap.
• Maintain a downward slope on the
drain line(s), including installa ons
in which the drain is not directly
below the water heater.
• If a neutralizer is installed, a fi eld-
supplied overfl ow bypass fi ng
(tee/wye) is recommended.
• Do not connect the condensate
drain line directly to a condensate
pump.
INSTALLATION
• If the drain line is required to have
bends, ensure that there are no
kinks that will restrict the fl ow of
condensa on.
• The condensate drain is at
atmospheric pressure (non-
pressurized) and therefore must be
allowed to drain freely with gravity
only. Ensure that the condensate
drain tube is not plugged or blocked,
and ensure that it slopes downward
to allow condensate to fl ow freely.
All por ons of the condensate drain
(neutralizer and drain tube) must be
at a lower eleva on than the water
heater to prevent condensate water
from building up inside the heat
exchanger.
• Condensate cannot be eff ec vely
neutralized if the neutralizer
elements have been completely
consumed. If this happens,
condensate will remain acidic and
can possibly cause damage to items
such as pipes, concrete, etc., if
drained improperly.
• The actual life of the neutralizer may
vary, depending on the applica on
and usage. Replace the cartridge
when the condensate pH goes
below 6.0.
• All preventa ve measures and
safety prac ces must be adhered
to when draining condensate.
The manufacturer will not be
responsible for any damage caused
by condensate.
• A drain pan, or other means of
protec on against water damage, is
recommended to be installed under
the water heater in case of leaks.
Residen al Gas Water Heater Use and Care Guide • 39
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