TriangleTube TR Series - Manual (Page 7)

Phase III ®
4
Installation
Temperature & Pressure (T&P) Relief Valve
To reduce risk of excessive pressures and tem-
peratures in the water heater, install tempera-
ture and pressure protective equipment
required by local codes, but no less than a com-
bination temperature and pressure relief valve
certified by a nationally recognized testing lab-
oratory that maintains periodic inspection of
production of listed equipment or materials, as
meeting the requirements for Relief Valves and
Automatic Gas Shutoff Devices for Hot Water
Supply Systems, ANSI Z21.22. This valve must
be marked with a maximum working pressure
of the water heater.
• Every Phase III ® water heater must be protect-
ed with a T&P relief valve.
• Determine T&P relief valve size by the follow-
ing specifications, unless they conflict with
local codes:
- TR 20/30/36/45 - SMART 20/30/40/50:
3/4”NPT with an AGA Rating of 100,000
BTU/hr. (Watts 100XL-8 or equivalent).
- TR 60/80/100/120 - SMART 60/80/100:
3/4”NPT with an AGA Rating of 200,000
BTU/hr. (Watts 40XL-8 or equivalent).
For proper operation of the T&P and to pre-
vent the T&P from activating due to boiler
water temperature, use a T&P relief valve
with extended element. Recommended, an
8” minimum length.
Phase III ® commercial water heaters will
absorb less than 200,000 BTU/hr when
domestic water outlet temperature is 210ºF
and boiler water supply temperature is
240ºF. Listed outputs are based on ASME
Section VIII Interpretation VIII-1-86-136.
Check with local codes for applicability.
Standard Installation
• Install T&P relief valve in the Auxiliary con-
nection located behind the air vent on the top of
the water heater (Figure 1 page 8).
or
• Install the T&P relief valve in the run (straight
through leg) of a tee located at the domestic hot
water outlet when using the Auxiliary connec-
tion for a recirculation return (Figure 2 page 9).
Commonwealth of Massachusetts Installation
Follow this procedure for jurisdictions requiring a
vacuum breaker to be installed on the domestic
cold water inlet.
• Install the T&P in the run (straight through leg)
of a tee located at the domestic hot water out-
let. Use a long element T&P relief valve
(Figure 3 page 10).
NOTICE
NOTICE
CAUTION