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15
Instructions for installation and use
TD & S substations
Danfoss District Energy
VI.GP.U2.02
DKDHR
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 frequency chart
presented in the section entitled “Operation and maintenance” on pages
20–21. Perform adjustment in accordance with the instructions below.
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 “+” (hot-
ter) or “-” (colder).
Start by turning the lever
clockwise
– until it stops/until you cannot turn
it any further. Then turn the lever
counter-clockwise
until the tempera-
ture 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.
By-pass function (factory connection).
The Akva Lux II / Les II TD substations are supplied with the a Danfoss
FJVR bypass thermostat (Fig. 2), so that when water is tapped, the water
heater immediately starts to produce hot water. We recommend setting
of the thermostat in pos. 3. If you have to wait a long time (i.e. more than
20 sec.) for hot water, it may be necessary to position the thermostat
higher than pos. 3.
If you want to avoid waiting time altogether, 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 circu-
lation thermostat, and the temperature of the circulation water can be
set independently of the domestic 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 entitled:
Instructions AVPL 1.0/1.6
Recommended setting
Basically, it is recommended to open the controller to its full extent. If
disruptions to operation arise, such as noise or fluctuations/poor regu-
lation capacity, it may be necessary to adjust the differential pressure
controller to a lower operating pressure.
Heating circuit, temperature control
The room temperature is regulated exclusively using the radiator
thermostats.
14. Adjustment and commissioning, Akva Lux II TD & Akva Les II TD
Fig. 1
Fig. 3
Fig. 2
