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Danfoss District Energy
VI.GP.N2.02
DKDHR
Instructions Water
Heaters
11.0 Akva Lux II / Akva Les II - Instructions
11.1 General
Variants
PLEASE NOTE that your water heater may look different than the water
heater shown, as variants with other components may be supplied.
The control function, however, is basically as described below.
Maintenance and setting
Remove the front insulation without using tools, just carefully pull the
insulation right side. Fix the front insulation with a slight pressure on
the sides and top. For cleaning of plate heat exchanger see pg 17.
11.2 Description
Fully insulated water heater. The domestic hot water is prepared in a heat
exchanger based on the flow principle and the temperature is controlled
by a combined hydraulic and thermostatic self-acting controller PTC2+P
controller with integrated differential pressure controller, which blocks
the flow of primary and secondary side flow through the heat exchanger
immediately after completion of the tapping process.
11.3 DHW temperature control
Danfoss PTC2+P controller (1) for DHW. The DHW temperature is adjusted
by turning the lever towards “+” (warmer) or “-” (colder).
Start by turning the handle
clockwise
- until stop /until the handle can
not be turned anymore. Then turn the handle
counter-clockwise
until
the temperature of the tap water is approx. 48 ° C at normal use (7-8 l/
min). The temperature should never exceed 55 ° C to avoid lime scale
precipitation.
11.4 Bypass or circulation thermostat
Bypass thermostat (default).
As a standard the Akva Lux II and Akva Les II are equipped with a by-
pass thermostat, Danfoss FJVR (2), which ensures that hot water is
produced immedia-tely, when tapping starts. It is recommended to
set the thermostat in pos. 3.
If the water temperature rises too slowly it can be necessary to set the
thermostat at higher value.
Alternatively a DHW circulation system must be installed.
Circulation thermostat / control change to circulation.
If the water heater is connected to the DHW recirculation system in the
building, the FJVR thermostat (3) will function as a circulation thermostat
and control the circulation water temperature, independently of the set
DHW temperature. It is recommended to set the thermostat in pos. 3.
For recirculation connection please refer to page 9 and10.
The photo to the right shows a water heater, on which circulation hose
and capillary tube have been mounted and connected to the domestic
hot water controller, enabling the temperature of the circulating water
to be controlled by the FJVR thermostat.
11.5 Akva Lux II / Akva Les II with Danfoss AVE
The AVE expansion unit absorbs the thermal expansion of water in the
heat exchanger. A discharge pipe is not necessary.
For mounting of AVE on site the brass bow must be removed and the
AVE with T-piece and non-return valve must be mounted as shown.
The AVE expansion unit must not be applied to systems with domestic
hot water recirculation.
For systems with DHW circulation the expansion
unit must be replaced by a safety valve and a discharge pipe, which is
piped directly into the floor drain, must be installed.
Note: The
Akva Lux II and Akva Les II water heaters
are not
mechanically fixed in the insulation back and must be handled
by lifting in both pipes and insulation simultaneously.
1
2
Handle for temperature setting
