Connecting The External Probe - Westen Boyler digit 240/40 Fi Manual Del Usuario

The DHW expansion vessel should be
mounted if:
• the pressure of the water supply or
lifting system is such as to require
the installation of a pressure reducer
(pressure higher than 4 bar)
• a non-return valve is fitted to the
water supply line
• the water supply network is insuffi-
cient for the expansion of the water
contained in the storage boiler and
it is necessary to use the DHW
expansion vessel.
Tip
For the efficient operation of the expan-
sion vessel, the pressure of the water
supply must be lower than 4 bar. If it is
not, install a pressure reducer.
Adjust the pressure reducer to obtain a
water supply pressure less than 4 bar.
For special areas, where the water is harder than 25 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate di-
spenser or an equivalent treatment system, compliant with current regulations.

28. CONNECTING THE EXTERNAL PROBE

Figure 16
INSTRUCTIONS FOR FITTERS
A
B
DHW expansion
Figure 15
vessel hose
52
storage boiler drain tap
CN 5
926.008.2 - EN