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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

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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

Summary of Contents for Akva Vita II TD

Page 1: ...Danfoss District Energy MAKING MODERN LIVING POSSIBLE Akva Vita II TD S Akva Lux II Akva Les II TD S Instructions for installation and use...

Page 2: ...ING STARTED 10 10 Installation instructions general 11 11 Installation instructions specially for S substations 12 12 Installation instructions recirculation connection 13 13 Adjustment and commission...

Page 3: ...Danfoss FJVR Differential pressure controller AVPL Safety valve Fitting piece for meter Thermometer DHW Dirt strainer Sensor pocket White painted cover Filter on cold water supply The unit has been p...

Page 4: ...tic hot water controller PTC2 P Bypass thermostat Danfoss FJVR Differential pressure controller AVPL Safety valve Fitting piece for meter Thermometer hot water Dirt strainer Sensor pocket White painte...

Page 5: ...exchanger brazed domestic hot water Domestic hot water controller PM2 P Bypass thermostat Danfoss FJVR Differential pressure controller AVPL Safety valve Fitting piece for meter Thermometer floor hea...

Page 6: ...Domestic hot water controller PTC2 P Bypass thermostat Danfoss FJVR Differential pressure controller AVPL Safety valve Fitting piece for meter Thermometer floor heating thermometer domestic hot water...

Page 7: ...s and an excessively high return temperature in the district heating circuit poor cooling of the district heating water Cooling i e the difference between the supply and return temperature of the dist...

Page 8: ...ccur noise in the radiator thermostats or poor regulation capacity it may be necessary to reset the differential pressure controller to a lower operating pressure We suggest that you contact your loca...

Page 9: ...mperature in the district heating network can be up to 120 C and the operating pressure can be up to 16 bar Thismayresultinariskofscaldingfromtouchingthesubstationand fromoutflowofthemedium Exceedingt...

Page 10: ...tructions if necessary 3 NB Tighten all pipe connections as they may have loosened during transport and handling 4 On systems that feature a safety valve establish a drain con nection in compliance wi...

Page 11: ...Before filling the system with water retighten all the pipe connec tions because vibrations and shocks during transport and handling may have caused leaks Once the system has been filled with water ti...

Page 12: ...he right Alwaysmountthesensoronthecoldestsideofthebuilding normally the north side It must not be exposed to morning sunlight and must not be po sitioned above windows doors ventilation ducts balconie...

Page 13: ...ion pump outside the substation is stopped for a protracted period we recommend shutting off the by pass thermostat for the same period NB Please note that substations fitted with Danfoss AVE expansio...

Page 14: ...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 t...

Page 15: ...oss FJVRbypassthermostat Fig 2 sothatwhenwateristapped thewater heaterimmediatelystartstoproducehotwater Werecommendsetting ofthethermostatinpos 3 Ifyouhavetowaitalongtime i e morethan 20 sec for hot...

Page 16: ...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 recirc...

Page 17: ...mmediatelystartstoproducehotwater Werecommendsetting 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 posit...

Page 18: ...ating conditions Indicative supply temperatures 40 C when the outdoor temperature is 10 C 55 C when the outdoor temperature is 0 C 65 C when the outdoor temperature is 10 C It is important to set the...

Page 19: ...power consumption For floor heating systems and old radiator set ups with large pipes and radiators turn the red switch to the right constant curve and set it to Max pos initially Then reduce the pre...

Page 20: ...build up in plate heat ex changers for domestic hot water on account of the large temperature fluctuations and because aerated water is used on the secondary side If it becomes necessary to clean the...

Page 21: ...the pipe connections Check that the safety valve on the cold water supply is functioning correctly Check the functionality by turning the lever on the safety valve Check that all components are intact...

Page 22: ...g Automatic components controller incorrectly adjusted or defective or possibly a power outage The pump is not working The pump is set at a step that is too low not all system types Air pockets in the...

Page 23: ...ivery Check whether the pump is running and whether there is a power supply to the pump Make sure that there is no air in the pump housing No hot water Dirt strainer in the district heating sup ply li...

Page 24: ...y EN 61000 6 2 2005 Electromagnetic compatibility Generic standard Immunity industry EN 61000 6 3 2007 Electromagnetic compatibility Generic standard Emission for residential commercial and light indu...

Page 25: ...gulations and the applicable legislation in every respect Installation and commissioning must only be performed by trained authorised personnel The substation is checked in the factory for leaks befor...

Page 26: ...26 DKDHR VI GP U2 02 Danfoss District Energy...

Page 27: ...27 27 Danfoss District Energy VI GP U2 02 DKDHR...

Page 28: ...Produced by Danfoss Redan A S 06 2012 VI GP U2 02 Danfoss Redan A S District Energy Omega 7 S ften DK 8382 Hinnerup Tel 45 87 43 89 43 Fax 45 87 43 89 44 redan danfoss com www redan danfoss dk...

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