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Installation
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5.2.1 Connecting the tank on the water side
System example with all recommended valves and shut-offs ( Fig. 9).
Fig. 9 Installation example
1 Tank coil supply
2DHW outlet
3 Cold water inlet
4 Boiler return
▶ Use installation material that is temperature resistant up to 230 °F
(110 °C).
▶ Never use open, vented expansion vessels.
▶ Use metal connection fittings in water heating systems with plastic
lines.
▶ If using a check valve in the cold water supply: Install a safety valve
between the non-return valve and the cold water inlet.
▶ Install a pressure reducer if the static supply water system pressure
is in excess of 72.5 psi (5 bar).
5.2.2 Installing a T&P safety valve (on-site)
▶ Install a listed T&P safety valve that is approved for drinking water
(≥ ¾ ") in the DHW outlet.
▶ This tank must be installed with a new T&P safety valve.
▶ The T&P valve must be sized no smaller than the rated tank capacity.
▶ Observe the safety valve installation instructions.
▶ T&P discharge pipe:
– The blow-off line must be at least equal to the outlet cross-section
of the safety valve.
– Route the blow-off line from the T&P valve directly to an adequate
drain (maximum length 6 ft (2 m) with no more than two 90°-
elbows).
– The discharge line must terminate at an adequate drain in order to
prevent property damage from spillage.
– Check that the T&P safety valve operates properly at least once
annually.
▶ Never plug the blow-off line. During heating, water may be
discharged for operational reasons at any time.
5.3 Install a tank water temperature sensor (accessory)
or aquastat (accessory)
Install a tank temperature sensor or an aquastat on the tank to measure
and monitor the hot water temperature.
6 720 801 773-10.1ITL
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3
4
DANGER: Danger to life from electric shock!
▶ Isolate the system electrically prior to commencing
work on the system.
Connect the electrical power and set the temperature on
the DHW temperature sensor or the aquastat as shown in
the respective aquastat or control manufacturer's
instructions.
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