10
Cold water booster sets tend to be sized on the
total demand of the system and subsequently
give a balanced condition.
A separate Strainer and PRV can be fitted to both
the hot and cold water services to give balanced
system pressures. Alternatively, a larger Strainer
and PRV can be installed to cope with both hot
and cold water demands.
CT plus 180
1”
1”
1”
60 litre ¾” 1”
HP60-6T1
Strainer
P.R.V.
Double
Check
Valve
Expansion
Vessel
Expansion
Relief
Valve &
Tundish
T & P
Relief
Valve
T & P Relief Valve.
Control & hand
reset limit stats.
Expansion relief
valve c/w tundish.
Expansion Vessel.
Check valve.
PRV.
Strainer.
Unvented System Kit.
Cold
Feed
CT plus 280
1”
1”
1”
60 litre ¾” 1”
HP60-6T1
CT plus 420
1”
1”
1”
80 litre ¾” 1”
HP80-6T
CT plus 520
1”
1”
1”
80 litre ¾” 1”
HP80-6T
Warning: On balanced systems
with a common PRV, Strainer and
Double check valve, ensure that
the valves are sufficiently sized
to cope with both hot and cold
water demand.
Hoval Unvented System Kits
Hoval have carefully sized and selected a range
of standard unvented system kits suitable for
installation with the CT plus range of calorifiers.
The various valves and fittings should be installed
in the sequence shown on the right.
The size of the standard unvented kits are shown
in the table below.
Please note that these kits are only sized for the
cold feed going into one of the CT plus calorifiers.
Using the PRV from a standard Hoval unvented
kit to provide a balanced hot and cold water
supply may cause pressure and water flow
problems. Ensure that the PRV can cope with
the demand from both the hot and cold water
services.
Unvented Systems
1.1/2”
1.1/2”
HP60-1”
HP60-1”
HP80-1”
HP80-1”
(Supplied with unvented calorifier)
Supplied factory fitted with unvented calorifier
