Safety Valves; Connecting Cold And Hot Water Pipes; Connecting The Heating System Supply And Return Pipes; Filling The Water Heater And Heating System - Danfoss DHP-H Installation And Service Instructions Manual

5 .5 Safety valves
• Radiator systems with a closed expansion tank must also be
equipped with an approved pressure gauge and safety valve,
minimum DN 20, for a maximum 3 bar opening pressure, or
according to country specific requirements.
• Cold and hot water pipes as well as overflow pipes from safety
valves must be made of heat resistant and corrosion-resistant
material, e.g. copper. The safety valve overflow pipes must have
an open connection to the drain and visibly flow into this in a
frost free environment.
Connecting pipe between the expansion tank and the safety valve
must slope continuously upwards. A continuous upwards slope
means that the pipe must not slope downwards from the horizontal
at any point.
5 .6 Connecting cold and hot water pipes
1. Connect the cold water and hot water pipes with all the neces-
sary components.
5 .7 Connecting the heating system supply
and return pipes
All pipes should be routed in such a way that vibrations cannot be
transmitted from the heat pump through the piping and out into
the building. This also applies to the expansion pipe. To avoid the
transmission of vibrations, we recommend that flexible hoses are
used for the supply pipe and return pipe on both the heating sys-
tem and brine system sides. Flexible hoses can be purchased from
Thermia Värme AB. Figures 12-15 show how appropriate and inap-
propriate installations look using this type of hose.
To avoid noise caused by pipe mounting, rubber-coated clamps
should be used to prevent the transmission of vibrations. However,
installation should not be too rigid and the clamps must not be too
tight.
Figure 25: Do not twist the flexible hoses as they are installed . At threaded con-
nections, use a counterhold spanner .
Figure 26: Cut the hose to the correct length to avoid excess bowing-out or
stretching at bends .
20
Figure 27: Cut the hose to the correct length to avoid excess bowing-out or
stretching and offset the ends so that the hose is not installed completely
Figure 28: Use fixed pipe bends to avoid excess stress on bends next to connec-
1. Connect the supply pipe with a flexible hose connection and
with all the necessary components.
2. Connect the return pipe with a flexible hose connection and
with all the necessary components including a filter.
3. Insulate the supply and return pipes.
4. Connect the expansion tank to the expansion outlet (22mm Cu)
on the top of the heat pump.
5 .8 Filling the water heater and heating sys-
tem
1. Fill the water heater with cold water by opening the filler valve
(10) which is located on the valve pipe.
2. Bleed by opening one of the hot water taps.
3. Then fill the water heater coil and the heating system with
water through the filling valve (12) to a pressure of approx.. 1
bar.
5 .9 Bleeding the heating system
1. Open all radiator valves fully.
2. Bleed all radiators.
3. Refill the heating system to a pressure of approximately 1 bar.
4. Repeat the procedure until all air has been removed.
5. Leave the radiator valves fully open.
VMBMA102
straight .
tions .