OSO HOTWATER Wally-W30 Manuel D'installation page 41

3.5.5 Fitting instructions
!
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
!
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-
!
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
!
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
!
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
!
section 3.4.
If the non-return valve or water meter is tight, a reduction valve and expansion vessel should
-
be fitted (to stop dripping from the safety valve).
If the maximum water pressure exceeds 6 bar in a 24-hour period, a reduction valve and expansion
-
vessel shall be fitted.
! WARNING
! CAUTION
RECOMMENDATION
9