Whirlpool Indirect-Fired Water Heater - Manual (Page 6)

Figure 3: Hot Water Outlet
2. Domestic Water
a. Cold Water In. Install brass tee and drain valve
(not provided). Install shutoff valve between
water supply and cold water inlet for ease of
service. See Figure 1.
For systems using a back flow preventer or no
return valve, install a thermal expansion tank
between cold water supply and valve to offset
expansion/pressure increase as water is heated.
See Figure 2.
b. Standard Domestic Hot Water Out. Install
brass tee and temperature and pressure relief
valve. Do not place any valves between the
temperature and pressure relief valve and the
tank. See Figure 3.
Run temperature and pressure relief valve dis-
charge piping to a suitable place to avoid dam-
age to building or injury to occupants. Do not
install reducing fittings or other restrictions.
Discharge piping must allow complete drainage
of both the temperature and pressure relief valve
and piping.
A heat trap will improve energy efficiency by
reducing piping heat loss.
c. Domestic Hot Water Out with Mixing Valve.
See Figure 4.
3. Boiler. Install Peerless Partner as a separate space
heating zone. Place boiler circulator(s) in boiler
supply piping.
For boiler with tankless heater, disconnect domestic
water piping and limit control (where used). Plug
limit tapping. Do not plug domestic water tappings.
4. Multiple Water Heaters installed as single unit.
Install boiler water piping and domestic piping in
parallel reverse return configuration. See Figure 5.
5. Peerless Partner with unfired storage tank. See
Figure 6.
Figure 1: Water Inlet
Figure 2: Thermal Expansion Tank
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Figure 4: Mixing Valve