Setting Up The Cylinder; Hydraulic Connections; Establishing The Hydraulic Connection To The Cylinder; Installing A Pressure-Relief Valve - Bosch Stora WP 180 P1 Installation And Maintenance Instructions Manual

Commissioning

6.2

Setting up the cylinder

▶ Remove packaging.
▶ Remove protective caps.
▶ Set up and align the cylinder ( Fig. 7/ 8 page 67).
▶ Apply Teflon tape or Teflon string. ( Fig. 9, page 67).
6.3

Hydraulic connections

WARNING
Risk of fire from soldering and welding!
▶ Take appropriate safety measures when soldering and welding as the
thermal insulation is combustible (e.g. cover thermal insulation).
▶ Check cylinder jacket for damage after completing work.
WARNING
Risk of injury from contaminated water!
Work carried out without due care for cleanliness pollutes the water.
▶ Install and equip the cylinder hygienically in accordance with national
standards and guidelines.
6.3.1

Establishing the hydraulic connection to the cylinder

System schematics with all recommended valves in the graphic part
( Fig. 10, page 67)
▶ Use installation material that is temperature-resistant up to 130°C
(260°F).
▶ Never use open, vented expansion vessels.
▶ Use metal connection fittings in DHW heating systems with plastic
lines.
▶ Size the drain line in accordance with the connection.
▶ To facilitate debris removal, never install elbows in the drain line.
▶ Keep primary line as short as possible and insulate it.
▶ If using a non-return valve in the cold water supply: Install a pressure
relief valve between the non-return valve and cold water inlet.
▶ Install a pressure reducer in the cold water pipe if the static pressure
in the system is in excess of 5 bar.
▶ Seal all unused connections.
6.3.2

Installing a pressure-relief valve

▶ Install a pressure-relief valve that is approved for potable water
(≥ DN 20) in the cold water supply ( Fig. 10, page 67).
▶ Observe the pressure relief valve installation instructions.
▶ Terminate the discharge pipe where it will be easily visible in the
frost-proof area via a dewatering point.
– The discharge pipe must be at least equal to the outlet cross-
section of the pressure relief valve.
– The discharge pipe must be able to discharge at least the
volumetric flow rate that could possibly arise at the cold water
inlet ( Tab. 5).
▶ Attach a notice with the following text to the pressure relief valve:
"Never close the discharge pipe. During heating, water may be
discharged for operational reasons."
46
If the static system pressure exceeds 80 % of the pressure relief valve
excess pressure:
▶ Install a pressure reducer upstream ( Fig. 10, page 67).
Gas supply Pressure relief
pressure valve excess
(static pressure) pressure
< 4.8 bar ≥ 6 bar
5 bar 6 bar
5 bar ≥ 8 bar
6 bar ≥ 8 bar
7.8 bar 10 bar
Table 7 Selection of a suitable pressure reducer
6.4

Temperature sensor

Mount a temperature sensor for measuring and monitoring the water
temperature. Number and position of the temperature sensor (sensor
pocket), see process description, Tab. 3.
▶ Fit the temperature sensor ( Fig. 11, page 68).
To ensure good thermal contact, ensure that the sensor surface has
contact with the sensor pocket surface over its full length.
7 Commissioning
DANGER
Danger of cylinder damage through positive pressure!
Positive pressure can result in stress cracks in the glass lining.
▶ Never close the discharge pipe of the pressure relief valve.
▶ Before connecting the cylinder, carry out a tightness test on the water
lines.
▶ Commission the wall mounted boiler, assemblies and accessories
according to the
manufacturer's notices and the technical documentation.
7.1

Commissioning the cylinder

CAUTION
Health risk from contaminated potable water!
Before filling the cylinder:
▶ Rinse any contamination out of the pipework and the cylinder.
▶ Fill the cylinder free of air whilst a DHW draw-off point is fully open,
until clear water flows steadily from it.
▶ Carry out tightness test.
Only perform the tightness test of the cylinder using potable water. On
the DHW side, the test pressure must not exceed 10 bar positive
pressure.
Setting the cylinder temperature
▶ Set the required cylinder temperature in accordance with the
operating instructions of the wall mounted boiler, taking the risk
of scalding at the DHW draw-off points into consideration
( Chapter 7.2).
Pressure reducer
In the EU + Outside the
CH EU
Not Not
required required
≤ 4.8 bar ≤ 4.8 bar
Not Not
required required
≤ 5 bar Not
required
≤ 5 bar Not
required
Stora – 6721839992 (2022/07)