Installation
26 Instruction manual GWV
3
is
3.6 Water connections,
Vented
Warning
The installation should be carried out by an authorised installation engineer,
in compliance with general and local regulations (1.3 "Regulations").
3.6.1 Cold water side
See (A) in the installation diagram (3.5 "Installation diagram").
1. Fit an approved stop valve (4) on the cold water side between the cold water
head tank (18) and the appliance, as required by
regulations (1.3 "Regulations").
3.6.2 Hot water side
See (B) in the installation diagram (3.5 "Installation diagram").
Note
Insulating long hot water pipes prevents unnecessary energy loss.
1. Fit the T&P valve (3).
2. Optional: fit a temperature gauge (12) so you can check the temperature of
the tap water.
3. Fit a stop valve (11) in the hot water outlet pipe for servicing.
4. If a circulation pipe is required, continue by installing the circulation
pipe (3.6.3 "Circulation pipe").
3.6.3 Circulation pipe
See (C) in the installation diagram (3.5 "Installation diagram").
If an immediate flow of hot water is required at draw-off points, a circulation
pump can be installed. This improves comfort and reduces water wastage.
1. Fit a circulation pump (6) of the correct capacity for the length and resistance
of the circulation system.
2. Fit a non-return valve (5) behind the circulation pump to guarantee the
direction of circulation.
3. Fit two stop valves for service purposes (4).
4. Connect the circulation pipe up to a connection of the storage tank.
3.6.4 System pump
The pump revs can be set using an adjuster unit. This setting depends on the
length of the pipes X between the storage tank and the appliance.
Legend
Only applicable numbers are mentioned.
1. pressure-reducing valve (mandatory if the mains
water pressure exceeds 8 bar)
2. inlet combination (mandatory)
3. expansion valve
4. stop valve (recommended)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
10. manual gas valve (mandatory)
11. service stop valve
12. temperature gauge (recommended)
14. hot water draw-off points
15. expansion valve (mandatory)
16. expansion vessel (mandatory)
18. water tank
19. float valve
23. P-valve
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
E. overflow pipe
H. overflow safety
