Potterton Housewarmer 45, Installation & Service Instructions Manual

Page: 8 / 45

3. Installation Requirements – Page 8
Flow
Return
Injector
Tee
Min
Circulating
Head 1.2m
(4ft)
Optional
Zone
Valve
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
Open Vented Gravity Domestic
Hot Water & Pumped Central
Heating System
BB45005C
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.
Fig. 4
Flow
Return
Max. 30.5m (100ft)
Min. 0.9m (3ft)
Top Of
Heat
Exchanger
Alternative By-pass
arrangement Using
The Bathroom
Radiator Fitted With
Two Lockshield Valves
Open Vented
Fully Pumped
System
Fitted With
A Combined
Feed & Vent
Water Level
Optional
Zone
Valves
Optional
3 Port
Valve
B
B
4
5
0
0
6
B
Vent
By-pass
Balancing
Valve
If The Pump Is Not Wired Directly To The Terminal Block,
Then A By-Pass Is Not Necessary
Fig. 5