TriangleTube Prestige Excellence Part 1 - Manual (Page 88)

7
Installation - Domestic Piping
Domestic Piping
• Union on domestic hot water outlet should be
piped at a higher elevation than domestic water
drain valve. This will make draining the water
heater easier.
• Use dielectric unions or couplings to protect
hot and cold water fittings from corrosion
when connecting dissimilar materials such as
copper and galvanized iron pipe.
• If copper pipe is used for domestic water con-
nections, first solder pipe to a threaded adapter
and then screw adapter into cold water inlet on
top of Excellence. Cold Water Inlet contains
an internal plastic dip tube which can be dam-
aged by heat from soldering.
Do not apply heat to the cold water inlet
when making sweat connections to water
heater. Sweat tubing to adapter before fit-
ting adapter to cold water inlet of heater. It
is imperative that no heat be applied to the
cold water inlet, as it contains a non metal-
lic dip tube.
• When the water supply pressure is higher than
70 psig, it is recommended to install a pressure
reducing valve on cold water supply line to
prevent water loss through T&P relief valve.
Thermostatic Mixing Valve
The Excellence is factory supplied with a thermo-
static mixing valve with built-in check valve. The
mixing valve must be installed as shown in Fig. 1.
The operating range of the thermostatic mixing is
90ºF to 120ºF.
For applications with a domestic recirculation
loop, the recirculation pump should be controlled
by an aquastat. The maximum recommended set-
ting of the aquastat is 10ºF lower than the thermo-
static mixing valve setting.
For proper operation of the thermostatic
mixing valve and to prevent potential scald-
ing hazards, the recirculation loop should
be controlled by an aquastat. DO NOT use
continuous recirculation.
Recirculation Piping
• Recirculation piping must be installed in the
cold water inlet as shown Fig. 5, page 9.
• A stainless steel or bronze circulator is recom-
mended.
Storage Tank Application
For applications requiring large volumes of domes-
tic hot water in a relative short period, the installer
may include a storage type tank (see Fig. 6 page 10)
in the domestic piping.
The installer must:
1. Relocate the thermostatic mixing valve from
the Excellence to the outlet of the storage
tank.
2. Provide recirculation from the storage tank
back to the Excellence using a bronze type
circulator. Maximum recommended recircu-
lation flow rate is 1 gpm.
NOTICE
DANGER
Cold
Hot Adapter
Check Valve
Mixed
Fig. 1: Mixing Valve Assembly