17
17
Instructions for installation and use
TD & S substations
Danfoss District Energy
VI.GP.U2.02
DKDHR
16. Adjustment and commissioning, Akva Lux II S & Akva Les II S
7369316-0 SIBC
VI.CB.T1.6K © Danfoss 05/03
1
Instructions
AVPL 1.0/1.6
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General information
PLEASE NOTE! Some models may have a slightly different appearance,
but the control function is in principle the same as described below.
Service and adjustment
The front insulation panel can be removed without the use of tools. Take
hold of the air duct at the top and bottom on the right-hand side, and
pull gently until the front section of the insulation releases from the rear
section. Then pull the front section completely free.
Perform maintenance procedures according to the maintenance fre-
quency chart presented in the section entitled “Operation and mainte-
nance” on pages 20–21. Adjustments should be made in accordance with
the instructions below and the instructions presented on pages 18-19.
Commissioning
Commission the substation in accordance with the instructions on page 10.
Regulation of the hot water temperature
Danfoss PTC2+P controller (Fig. 1) for domestic hot water. Adjust
the hot water temperature by moving the adjuster lever towards “+”
(hotter) or “-” (colder). Start by turning the lever clockwise – until it
stops/until you cannot turn it any further. Then turn the lever coun-
ter-clockwise until the temperature of the tap water is approx. 48°C
during normal tapping flow (7–8 litres per min.). The temperature
must never exceed 55°C to prevent limescale deposits building up
in the water heater.
Bypass function (factory connection).
The Akva Lux II / Les II S substations are supplied with a bypass thermo-
stat – Danfoss FJVR (Fig. 2) – so that when water is tapped, the water
heater immediately starts to produce hot water. We recommend setting
the thermostat to pos. 3. If you have to wait a long time (i.e. more than
20 sec.) for the hot water, it may be necessary to set the thermostat to
a position higher than pos. 3. If you want to avoid waiting time alto-
gether, you will need to set up domestic hot water recirculation to the
tapping points.
Scale setting: (indicative.)
Pos. 2 ≈ 30°C
3 ≈ 40°C
4 ≈ 45°C
Circulation thermostat / conversion to recirculation.
In systems with recirculation, the thermostat (Fig. 2) functions as a circula-
tion thermostat, and the temperature of the circulation water can be set
independently of the hot water temperature selected. We recommend
setting of the thermostat to pos. 3. For instructions about how to set up
a recirculation connection, see page 13.
Differential pressure controller
The differential pressure controller (Fig. 3) reduces the high fluctua-
tions in pressure in the district heating network, ensuring constant
operating pressure across the substation. The differential pressure
controller is pre-set to 0.1 bar from the factory. To alter the differential
pressure, use an Allen key – NV3. One full turn is equivalent to 0.01 bar.
Turn clockwise to increase the pressure, counter-clockwise to reduce it.
The controller can be adjusted subsequently – see the appendix enti-
tled
Instructions AVPL 1.0/1.6
Recommended setting
In principle, it is recommended to open the controller to its full extent.
If disruptions to operation arise, such as noise or fluctuations/poor reg-
ulation capacity, it may be necessary to adjust the differential pressure
controller to a lower operating pressure.
Heating circuit, temperature control
The supply temperature is controlled as standard by an self-acting
thermostat. Alternatively, the Akva Lux II /Les II S can be ordered with a
Danfoss Weather Compensator – ECL 210.
Pump for the heating circuit.
The Akva Lux II / Les II S substations are fitted with an Alpha2, A-pump
for the heating circuit.
See pages 18 and 19 for additional informa-
tion about controlling the heating circuit, including the pump.
Fig. 1
Fig. 3
Fig. 2
