Glow-worm Energy7 Series - Installing the Heating Pump; Heating Water Supply in the Open Heating System; Heating Water Supply in the Closed Heating System

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
RETURNFLOW
Method 1
SUPPLY
PIPE
AIR GAP
TUNDISH
CONTROL
VALVE
CONTROL
VALVE
TYPE CA BACKFLOW
PREVENTION DEVICE
BOILER
RETURNFLOW
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