Installing A T&P Safety Valve (On-Site); Install A Tank Water Temperature Sensor (Accessory) Or Aquastat (Accessory) - Buderus SU80/5 Installation And Maintenance Instructions Manual

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 DHW 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).
DANGER: Risk of fatal injury 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.
Install a tank temperature sensor or an aquastat on the DHW tank to
measure and monitor the hot water temperature.
Installing the DHW temperature sensor
▶ Take the tank temperature sensor from the scope of delivery of the
control panel (accessories).
▶ Insert the sensor set until it bottoms out inside the sensor well [5].
This automatically pushes back the plastic spiral [3] that holds the
sensor set together.
The compensating spring [4] ensures contact between the sensor well
and sensor surfaces, and a reliable temperature reading.
Always ensure that the full length of the sensor surface is
in contact with the sensor well.
SU54.5 | SU80.5 | SU100.5 – 6 720 819 292 (2017/11)
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Fig. 12 Installing the DHW temperature sensor
[1] Quarter-circle spacer
[2] Temperature sensor
[3] Plastic spiral
[4] Compensating spring
[5] Sensor Well
▶ Push sensor retaining clip [1] from the side onto sensor well [2].
▶ Route the sensor lead to the boiler or control panel and ensure the
cable is not strained. The piping may not touch any hot parts of the
boiler.
▶ When sensors are used without a compensating spring, fill the cavity
in the sensor well with a sufficient amount of thermal grease.
Fig. 13 Installing the sensor retainer
[1] Sensor retainer
[2] Sensor Well
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Installation
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