General pipe
connections
Pipe installation must be carried out in accordance with
current norms and directives.
The pipe dimension should not be less than the recom-
mended pipe diameter according to the table below.
However, each system must be dimensioned individually
to achieve the recommended system flows.
MINIMUM SYSTEM FLOWS
The installation must be dimensioned at least to manage
the minimum defrosting flow at 100% pump operation,
see table.
Minimum re-
commended
pipe dimen-
sion (mm)
Minimum re-
commended
pipe dimen-
sion (DN)
Minimum
flow during
defrosting
(100% pump
speed (l/s)
Air/water
heat pump
22200.27F2120-8
22200.27F2120-8
(1x230V)
Minimum re-
commended
pipe dimen-
sion (mm)
Minimum re-
commended
pipe dimen-
sion (DN)
Minimum
flow during
defrosting
(100% pump
speed (l/s)
Air/water
heat pump
22200.19F2040-6
22200.19F2040-8
Minimum re-
commended
pipe dimen-
sion (mm)
Minimum re-
commended
pipe dimen-
sion (DN)
Minimum
flow during
defrosting
(100% pump
speed (l/s)
Air/water
heat pump
22200.19HBS 05-6/
AMS 10-6
22200.19HBS 05-12/
AMS 10-8
NOTE
An undersized system can result in damage to
the machine and lead to malfunctions.
VVM 225 together with a compatible air/water heat
pump (See chapter "Outdoor modules") constitutes a
complete installation for heating and hot water.
The system requires the size of the radiator circuit to
be designed for a low temperature heating medium. At
the lowest dimensioned outdoor temperature, the
highest recommended temperatures are 55 °C on the
supply line and 45 °C on the return line, but VVM 225
can handle up to 70 °C on the supply line.
Overflow water from the safety valve goes via an over-
flow cup to a drain so that hot water splashes cannot
cause injury. The entire length of the overflow water
pipe must be inclined to prevent water pockets, and
must also be frost-proof. The mouth of the overflow
water pipe must be visible and not located close to
electrical components.
NIBE recommends installing VVM 225 as close to the
heat pump as possible for optimum comfort. For further
information about the location of different components,
see section "Installation alternatives" in this manual.
Caution
Ensure that incoming water is clean. When
using a private well, it may be necessary to
supplement with an extra water filter.
NIBE VVM 225Chapter 4 | Pipe connections16
4 Pipe connections
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