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Instructions for installation and use
TD & S substations
Danfoss District Energy
VI.GP.U2.02
DKDHR
10. Installation instructions, general
The installation, connection and maintenance of the substation must
be performed by qualified and authorised personnel. Installation
must always be performed in accordance with the applicable legisla-
tion and in compliance with these instructions.
The substation must be installed so that it is freely accessible and
can be maintained without unnecessary disruption. Lift the substa-
tion by its mounting plate/rear section and secure it to a solid wall
using 2 sturdy bolts, screws or expansion bolts positioned in the two
keyholes in the mounting plate/rear section.
On Akva Vita II S substations, we recommend positioning of rub-
ber spacers between the wall and the unit to prevent the transfer
of resonance noise from the pump into the wall.
Before commissioning, rinse all the pipes in the household piping sys-
tem thoroughly to remove any impurities, and check and clean the dirt
strainers in the substation.
For fully insulated systems
The insulation front panel on the Akva Lux II / Les II TD and the Akva
Lux II / Les II S substations can be removed without using tools. Take
hold of the air duct in the top and bottom of the front insulation
section (see the photos to the right) and pull carefully forward until
the front insulation section releases from the rear section. Then pull
gently until the front section is free from the components.
Test and connections
Before filling the system with water, retighten all the pipe connec-
tions because vibrations and shocks during transport and handling
may have caused leaks. Once the system has been filled with water,
tighten all the pipe connections once more before performing pres-
sure test for leaks. After heating of the system, check all the connec-
tions and retighten if necessary.
Please note that the connections may feature EPDM rubber gaskets!
Therefore, it is important that you DO NOT OVERTIGHTEN the
union nuts.
Overtightening may result in leaks. Leaks caused by
overtightening or failure to retighten connections are not covered
by the warranty.
Heat meter, fitting pieces
The unit is equipped with fitting pieces for heat heating meter on the
district heating supply and return lines – dimensions 3/4” x 110 mm –
3/4 x 165 mm.
Fitting of heat meters
- Close the ball valves on the district heating and the heating sides
- Loosen the union nuts at both ends of the fitting piece and
remove it
- Fit the meter – remember to insert gaskets
- Fit the temperature sensors in the sensor pockets (see the meter
instructions)
- Tighten the pipe connections before commissioning the meter.
Meter display (reading unit)
The meter’s reading unit can be positioned as shown in the photo
to the right, such that the meter reading can be made simply be
removing the top left-hand corner of the insulation cover.
Safety valve
Always lead the blow-off pipe from the safety valve to a drain in
accordance with applicable legislation.
Safety valve – cut-out in the insulation cover
On fully insulated models, it is necessary to cut a hole in the cover
(for the blow-out pipe from the safety valve) – see the photo to
the right.
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