18
Installation and maintenance instructions ecoFIT sustain 0020277262_02
7
Installation
7.1
Preparing for installation
▶
Make sure that the existing gas meter and the pipelines
are capable of passing the rate of gas supply required.
▶
Consider the maximum heat output given in DHW mode.
▶
Install the following components:
–
Draining cocks at the lowest points in the heating
installation (
→
current version of "BS 2879")
–
A bypass that is at least 1.5 m away from the product
–
A stopcock in the gas pipe
–
Where applicable, a flow regulator valve to adjust the
flow rate
▶
Install the connection pipes such that they are free from
mechanical stress.
▶
If you use non-diffusion-tight plastic pipes in the heating
installation, ensure that no air gets into the heat gener-
ator circuit.
▶
Only solder connectors if the connectors are not yet
screwed to the service valves.
▶
Only bend connection pipes if they have not yet been
connected to the product.
▶
Flush the heating installation thoroughly before installing
the product.
▶
Check the leak-tightness of the gas valve assembly using
a pressure of
≤
11 kPa (110 mbar).
7.2
Installing the heating pump
Pressure loss in the product
from the product
0
50
100
150
200
250
300
350
400
0
200
400
600
800
1000 1200 1400 1600
430
424
418
415
412
435
A
B
1
2
A
Flow rate [l/h]
B
Pressure loss [mbar]
1
Pressure loss
–
ecoFIT
pure 412 - 418
2
Pressure loss
–
ecoFIT
pure 424 - 435
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 isolation valves upstream and downstream of the
pump.
▶
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.
7.3
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
