Bosch 7 735 500 791, Installation And Maintenance Instructions For The Contractor

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W 300-5 P – 6 720 821 103 (2018/10)
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Transport
4 Transport
▶ Secure the DHW cylinder during transportation to prevent it from
falling.
▶ Move packed DHW cylinder with a sack truck and lashing strap
(

Fig. 4, page 57).
-or-
▶ Move unpacked DHW cylinder with a transport net; during handling,
protect connections against possible damage.
5 Assembly
The DHW cylinder is delivered fully assembled.
▶ Check that the DHW cylinder is complete and undamaged.
5.1 Installation
5.1.1 Requirements for installation location
▶ Place the DHW cylinder on a plinth if there is a risk of water collecting
at the installation location.
▶ The installation site must be a dry and frost-free room.
▶ Observe minimum room height (

Tab. 4 page 26) and minimum
wall clearances at installation location (

Fig. 6, page 57).
5.1.2 Positioning the DHW cylinder
▶ Stand the DHW cylinder upright and level it (

Fig. 6 to Fig. 8,
page 58).
▶ Remove protective caps (

Fig. 9, page 58).
▶ Apply Teflon tape or Teflon string (

Fig. 10, page 58).
5.2 Hydraulic connections
5.2.1 Connecting the DHW cylinder on the water side
System schematics with all recommended valves (

Fig. 11, page 59).
▶ Use installation material that is heat-resistant to 160 °C (320 °F).
▶ Never use open, vented expansion vessels.
▶ Use metal connection fittings in potable water 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 lines as short as possible and insulate them.
▶ 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 if the static system pressure is in excess of
5 bar.
▶ Seal all unused connections.
5.2.2 Install a pressure relief valve (provided by the customer)
▶ Install a type-tested pressure relief valve on site that is approved for
potable water (

DN 20) in the cold water supply (

Fig. 11,
page 59).
▶ 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 flow rate
that is feasible at the cold water inlet (

Tab. 4, page 26).
▶ 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. 11, page 59).
5.3 Installing the hot water temperature sensor
Install the hot water temperature sensor at the test point [7] to measure
and monitor the DHW temperature in the DHW cylinder
(

Fig. 3 page 56).
▶ Install the hot water temperature sensor (

Fig. 12, page 59).
Ensure that the sensor surface has contact with the sensor pocket
surface over its full length.
5.4 Immersion heater (accessory)
▶ Install the immersion heater in accordance with the separate
installation instructions.
▶ When installation of the cylinder is complete, inspect the ground
conductor (including metal connection fittings).
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.
WARNING: Risk of fire from soldering and welding!
▶ Take appropriate safety measures when soldering
and welding as the thermal insulation is flammable.
For example, cover up the 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
contaminates the potable water.
▶ Install and equip the DHW cylinder hygienically in
accordance with national standards and guidelines.
Gas supply
pressure (static
pressure) Pressure relief
valve excess
pressure
Pressure reducer
in the EU outside the EU
< 4.8 bar

6 bar not required
5 bar 6 bar max. 4.8 bar
5 bar

8 bar not required
6 bar

8 bar max. 5.0 bar not required
7.8 bar 10 bar max. 5.0 bar not required
Table 7 Selection of a suitable pressure reducer