OSO HOTWATER Wally W 30 Installation Manual page 25

3.5.5 Fitting instructions
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The product shall be filled with water before the power is switched on.
The discharge pipe from any safety device shall be at least one pipe size larger than the
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nominal outlet size of the safety device (< 9m length). The discharge pipe shall have
continuous fall to drain, be uninterruptable and frost-free at all times.
The product shall be placed in a room with a drain, in accordance with local rules. Alterna-
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tively, fit an automatic stop valve with sensor and overflow from safety valve to drain.
The product shall be properly aligned vertically and horizontally. The product shall be fixed to a
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wall structure suitable for the total weight of the product when in operation.
The product must have a clearance for servicing of 40 cm in front of the cover / 10 cm under
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the base plate when wall-mounted.
3.5.6 Installation recommendation
Min. distance from ceiling to wall bracket is 25 cm to allow space for hanging. See diagram in
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section 3.4.
If a non-return valve or water meter is fitted, a pressure reduction valve and expansion vessel
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should be fitted to avoid dripping from the safety valve.
If the maximum water pressure exceeds 6 bar in a 24-hour period, a pressure reduction valve and
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expansion vessel shall be fitted.
! WARNING
! CAUTION
RECOMMENDATION
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