Mounting Method; Installation Location; Setting Up The Cylinder; Hydraulic Connections - Bosch Stora WS 300-5 PK Installation And Service Instructions For Contractors

Mounting method

5 Mounting method
The cylinder is delivered fully assembled.
▶ Check that the cylinder is complete and undamaged.
5.1

Installation location

NOTICE
Risk of damage from inadequate load-bearing capacity of the
installation surface or unsuitable floor surface!
▶ Ensure that the installation surface is level and offers sufficient load-
bearing capacity.
▶ Install the cylinder in a dry frost-free interior.
▶ If there is any danger of water accumulating on the floor of the
installation location: place the cylinder on a plinth.
▶ Observe the minimum wall clearances inside the installation room
( Fig. 8, page 69).
5.2

Setting up the cylinder

 Fig. 10ff, page 70
▶ Remove packaging.
▶ Optional:
– Remove the casing lid, handhole cover and outer casing and store
temporarily.
▶ Place cylinder on a soft mat (e.g. blanket).
▶ Unscrew the cylinder from the pallet.
▶ Screw the adjustable feet back in.
▶ Position and align the cylinder.
▶ Optional:
– Wrap the outer casing that was previously removed around the
cylinder. Pay attention to the position of the connector.
– Close Velcro fastener.
– Fit the casing lid.
– Attach the hand-hole cover.
▶ Fasten the template for affixing the company logo to the top end of
the cylinder.
▶ Affix the company logo to the outer casing as specified on the
template.
▶ Dispose of template and fixing materials.
▶ Remove protective caps.
▶ Apply Teflon tape or Teflon string.
5.3

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.
52
5.3.1

Establishing the hydraulic connection to the cylinder

System schematics with all recommended valves and taps in the graphic
part ( Fig. 17/ 18, page 72).
▶ Use installation material that is temperature-resistant up to 160°C
(320 °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.
5.3.2

Installing a pressure-relief valve

▶ Install a pressure-relief valve that is approved for potable water
(≥ DN 20) in the cold water supply ( Fig. 17/ 18, page 72).
▶ 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."
If the static system pressure exceeds 80 % of the pressure relief valve
excess pressure:
▶ Install a pressure reducer upstream ( Fig. 17/ 18, page 72).
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
5.4

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. 19, page 73).
To ensure good thermal contact, ensure that the sensor surface has
contact with the sensor pocket surface over its full length.
5.5

Immersion heater (accessory)

▶ Install the immersion heater in accordance with the separate
installation instructions.
▶ Once the cylinder is fully installed, inspect the protective conductor.
This should also include the metal connection fittings.
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 – 6720821526 (2021/06)