Installation manual

6
4 Installation
4.1 Plumbing
 The system must be filled and flushed with clean
fresh water to ensure the removal of all the air
from the installation. Air bleed points must be
installed at every high point in the system; in
particular, the installer must remember to install
an air bleed on the heat pump pipe if it is a local
high point since there is no air bleed point on
the condenser. Dimplex recommend the use of a
power flush and purge cart to facilitate this
process.
 Flow and return isolation valves (Flow 1755760,
Return 1755770) and piping must be fitted to
each of the condenser connections on the back
of the heat pump, as shown in figure 7.
 The isolation valve on the return is also fitted
with a non-return valve (built into ‘175770’) and
a strainer (included in the Dimplex heat pump
hydraulics pack). This means that in order to
clean the strainer, the system does not have to
be drained. Instead, it is possible just to close
the isolation valves on the flow and return and
remove the strainer. This way, the only water
that will be lost from the system is that between
the non-return valve and strainer.
 The strainer must be fitted in order to prevent
contamination of the condenser heat exchanger.
If an alternative strainer is used, it must be at
least 7 microns in size and connected with ball
valves.
 System pressure must be checked once valves
are re-opened.
 Direct condensate drain pipe to soak away or
drain, as illustrated in figure 5 in section 3.5.2.
 All piping must be properly insulated and
external length kept to a minimum.
4.2 Electrical connections
The heat pump system consists of the heat pump,
wiring centre and user interface. If a Dimplex A-Class
cylinder is also purchased, the wiring centre is built
into the cylinder. The user interface contains a
thermostat and is sufficient if one heating zone is
present.
Optional, additional temperature probes or room
thermostats are required for additional heating zones.
Figure 8 (a) – (c) shows the wiring configuration of
the 3 different installation options (outlined in section
2: Scope of Delivery, at the beginning of this manual).
4.3 Opening the Heat Pump for Electrical
Connections
To open the heat pump, follow the procedure shown in
figure 9:
 Unscrew 2 screws holding bottom panel, using a
PZ2 screwdriver.
 Pull the front panel down and then out to
remove.
 Unscrew 5 screws holding the front cover of the
electrical box to open and pull down towards
you.
 Remove 2 PZ2 screws holding the door flap in
place to access cable connections.
NOTE: Follow steps in reverse order to close the heat
pump. When closing the heat pump front panel,
ensure that the top and bottom panels are interlocked.
WARNINGS:
Before opening the heat pump,
ensure all circuits are isolated.
Ensure that the components in the
electrical box do not get wet when
the electrical box is opened.
!
!
!
The main 230V power cable must be
supplied via a suitable sized exterior
isolator, lockable in the OFF
position.
Figure 7: Flow and return valves