Potterton Housewarmer 45 Installation & Service Instructions Manual page 8

3. Installation Requirements – Page 8
By-pass Using Bathroom
Radiator Connection Into
Gravity Circuit & Fitted
With Two Lockshield
Valves To Be Installed
When A Zone Valve Is
Fitted In Gravity Circuit
Min
Circulating
Head 1.2m
(4ft)
Fig. 4
Water Level
Open V ented
F ully P umped
S ystem
F itted With
A Combined
F eed & V ent
Max. 30.5m (100ft)
Min. 0.9m (3ft)
Top Of
Heat
Exchanger
Fig. 5
Open Vented Gravity Domestic
Hot Water & P umped Central
Injector
Tee
Optional
Alternative By-pass
arrangement Using
The Bathroom
Radiator Fitted With
Two Lockshield Valves
By-pass
Balancing
Valve
If The Pump Is Not Wired Directly To The Terminal Block,
Then A By-Pass Is Not Necessary
An Anti Gravity Check Valve,
Or Some Other Mechanical
Device (E.G. Motorised Valve,
Gate Valve), Should Be Fitted
To The Radiator Circuit Where
It Is Required To Prevent
Gravity Circulation When
The Pump Is Not Operating.
Optional
Zone
Valve
Heating S ystem
Vent
Optional
3 Port Zone
Valve
Valves
Flow
Return
BB45005C
Flow
Return