14
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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13. Adjustment and commissioning, Akva Vita II TD
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
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 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 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. (NB! The
pin must be positioned between the blue and red dots, otherwise
the controller will shut down).
By-pass function (factory connection).
The Akva Vita 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 re-commend
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
circulation 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 in-
structions 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
regulation 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.
Fig. 1
Fig. 3
Fig. 2
