7 Installation
22
Installation and maintenance instructions Energy
7
0020300877_01
7.5
Installing the heating pump
The flow rate must not fall below the value in the diagram.
▶
Only use pumps that have an in-rush current
≤
10/15 A.
▶
When designing/selecting the pump, note the pressure
loss of the product.
▶
Install the pump in the heating flow.
▶
Install the pump upstream and downstream of the pump
isolation valves.
▶
Set the pump so that the temperature difference between
the flow and return is no more than 20 °C when the max-
imum flow temperature is set.
–
The flow rate specified in the technical data is
reached.
7.6
Heating water supply in the open heating
system
▶
Connect the product to a supply/expansion tank as
shown in the figure.
–
The tank must not be more than 27 m (90 ft) above
the product.
–
The open vent pipe must be installed with an upward
gradient and must not be blocked.
–
Supply pipe diameter:
≥
15 mm
–
The relative positions of the pump, supply and open
vent pipe must be as shown in the figure.
Condition
: Combined supply and open vent pipe
▶
Install the line in accordance with "BS 5449".
–
Diameter:
≥
22 mm
7.7
Heating water supply in the closed heating
system
TEMPORARY
CONNECTION
HOSE
UNION
HOSE
UNION
SUPPLY
PIPE
CONTROL
VALVE
CONTROL
VALVE
DOUBLE
CHECK
VALVE
HEATING
CIRCUIT
DRAIN
POINT
BOILER
RETURN
FLOW
Method 1
SUPPLY
PIPE
AIR GAP
TUNDISH
CONTROL
VALVE
CONTROL
VALVE
TYPE CA BACKFLOW
PREVENTION DEVICE
BOILER
RETURN
FLOW
HEATING
CIRCUIT
DRAIN
POINT
Method 2
A safety valve must be fitted to a sealed system. It shall be
preset, non-adjustable with a lift pressure of 3 bar, incorpor-
ating seating of a resilient material, a test device and a con-
nection for drain. The drain from the safety valve must be
routed outside the building, must not discharge above an en-
trance or window or any type of public access area, be clear
of any electrical fittings and positioned so that any discharge
can be seen.
A diaphragm type expansion vessel, conforming to the cur-
rent issue of BS 4814 (see also BS 7074 Part 1 and 2) must
be connected at a point close to the inlet side of the circu-
lating pump, see the diagrammatic layout above, unless laid
