5.5
Piping work
N
The unit is only to be used in a closed water system. If applications are
in open water circuit, it will generate heat exchanger's fouling, corro-
sion, leak.
Caution
Be careful not to deform the unit piping by using excessive force when
connecting the piping.
Deformation of the piping can cause the unit to malfunction. Always use two wrenches (spanners) for tightening or loosening the water
connections, and tighten connections with a torque wrench as specified in below table. If not, connections and parts can be damaged
and leaks.
Water connections must be made in accordance with the outlook diagram delivered with the unit, respecting the water in- and outlet. If
air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting
the water circuit:
▪
Use clean pipes only.
▪
Hold the pipe end downwards when removing burrs.
▪
Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
▪
Use a good thread sealant for the sealing of the connections. The sealing must be able to withstand the pressures and tempera-
tures of the system.
▪
When using non-brass metallic piping, make sure to insulate both materials from each other to prevent galvanic corrosion.
▪
Because brass is a soft material, use appropriate tooling for connecting the water circuit. Inappropriate tooling will cause damage
to the pipes.
5.5.1
Flushing and air-purging
When filling water, the following start-up procedure should be followed.
1. All system components and pipes must be tested for the presence of leaks.
2. Preparation of a make-up water assembly or flushing unit is recommended for installation and service.
3. Before connecting pipes to the Outdoor Unit, flush water pipes clean to remove contaminants using a flushing unit or
tap water pressure if it is adequate (at 2 to 3 bar)
4. Fill water into the Outdoor Unit by opening shut-off & drain valve.
5. Purge the air. (Fill with a flushing unit with sufficient capacity: avoid aerating the water)
6. Circulate for long enough to ensure that all air has been bled from the complete water piping system.
Installation Guide
DHP-iQ
Danfoss Heating Solutions
VIJSS102
39
