16
Instructions for installation and use
TD & S substations
DKDHR
VI.GP.U2.02
Danfoss District Energy
pin
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
Maintenance and adjustment
The cover can be removed/lifted off without the use of tools.
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 PM2+P controller (Fig. 1) for domestic hot water. Set the hot
water temperature by turning the regulation lever towards red (hotter)
or blue (colder).
Start by turning the lever
clockwise
– until the pin is opposite the blue
dot. Then turn the lever
counter-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. (NB! The pin must be positioned
between the blue and red dots, otherwise the controller will shut down).
Bypass function (factory connection).
The Akva Vita II S substations are supplied with a bypass thermostat –
Danfoss FJVR (Fig. 2) – so that when water is tapped, the water heater
immediately starts to produce hot water. We recommend setting of
the thermostat to 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
circulation 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 con-
troller is pre-set to 0.1 bar from the factory. To alter the differential pres-
sure, 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
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, temperture control
The supply temperature is controlled as standard by an self-acting
thermostat. Alternatively, the Akva Vita II S can be ordered with a
Danfoss Weather Compensator – ECL 210.
Pump for the heating circuit.
The Akva Vita II S substations are fitted with a Wilo Yonos A- pump for
the heating circuit.
See pages 18 and 19 for additional information about controlling
the heating circuit, including the pump.
15. Adjustment and commissioning, Akva Vita II and Akva Les S
Fig. 1
Fig. 3
Fig. 2
