User`s guide

Page 9
Section 4: Heating System Connection
The following should be verified before connecting to the
heating system. Further information is available in the
planning manual.
 The 50L minimum water volume of the system is
observed by the installation of a buffer tank.
 A dirt filter is installer on the return pipe to the
heat pump.
 The pipe sizes are adequate to allow the correct
minimum water flow rate through the heat pump.
 A by-pass valve has been designed into the
circuit to ensure there is always flow though the
heat pump even when the heating circuits are
closed.
 Air bleed valves have been installed at every
highpoint in the pipe work.
External pipe work
The pipe work running from the heat pump into the
property should be sufficiently insulated to minimise the
heat loss and consideration should be given to using the
correct material so that it does not corrode.
Minimum heating water flow rate
The minimum water flow rate which is stated in the
„performance data table‟ must be observed. The
following factors should be considered:
 Hydraulic resistance of the pipe work. Special
attention should to given to ensure the correct
pipe diameter is chosen considering the
required flow rates.
As a rule of thumb 28mm pipe work should be
used although the sizing of the pipe work
remains the responsibility of the installer.
 To minimise energy consumption the pump
should run of the lowest speed possible whilst
still achieving the correct flow rate. The
resistance of all the pipe fittings, filter, heat
emitters and condenser must be taken into
account.
Failure to observe the minimum water throughput will
cause the heat pump not to work due to operation of the
flow switch alarm (H62).
The maximum water throughput is 20% more than the
stated minimum water throughput. Exceeding the
maximum flow rate would result in an inefficient system
operation due to increased pumping losses.
For systems in which the heating water flow can be shut
off via actuators or thermostatic valves an overflow
bypass valve must be installed to guaranteed to minimum
water flow rate.
Taconova flow checker
The Taconova flow checker is provided in every system
package to provide a simple way to verifying that the flow
rate is correct. The flow rate is read on the bottom of the
spinner as shown in
Figure 5: Correct reading of flow rate on the taconova flow
checker
The flow checker should be installed in a visible location
inside the property and as close to the heat pump flow as
possible. In order given an accurate reading the pipe
installation distances shown in Figure 6 should be
observed as well as the flow direction as shown in Figure
7.
It is important to install the flow checker on the flow pipe
so it is protected from impurities within in the system via
the filter on the heat pump return.
When connecting the heating system,
all applicable regulations must also be
adhered to including all relevant
European and national regulations and
local building regulation codes.
Work that requires the covers to be
removed must only be carried out under
supervision of qualified contractor,
installation engineer or service person.
The installation of an air source heat
pump must be carried out by a Dimplex
Qualified installer.