Diagram 1
Inlet pressure less than 4 bar - expanded hot water can be accommodated in the pipework
Diagram 2
Inlet pressure less than 4 bar but expanded water cannot be accommodated in the pipework.
(Using pack AQ2 expansion vessel and check valve).
Minimum length of pipe - Length’A’
Size
15 mm pipe
22 mm pipe
10 litres
2.7 m (9 ft)
1.2 m (4 ft)
15 litres
4.2 m (14 ft)
1.8 m (6 ft)
Diagram 3
Inlet pressure is greater than 4 bar and expanded water cannot be accommodated in the pipework.
(Using pack AQ2 and AQ3 expansion vessel, check valve and pressure reducing valve).
8
Zip Varipoint II Installation, Maintenance and User Instructions - June 2004
Hot water
outlet
Expansion
relief valve
Nearest cold
water draw off
Cold water
supply
Service
valve
To drain
Hot water
outlet
Expansion
relief valve
Expansion
vessel
Cold water
supply
Service
valve
Check
valve
To drain
Hot water
outlet
Expansion
relief valve
Pressure
reducing
valve
Expansion
vessel
Cold water
supply
Service
valve
Check
valve
To drain
A
