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Instructions for installation and use 

TD & S substations

Danfoss District Energy 

VI.GP.U2.02 

DKDHR

Problem

Possible cause

Solution

Domestic hot water,

 

Fluctuating temperature

Non-return valve in the circulation pipe 

defective (leads to mixing – the circula-

tion water pipes become cold during 

tapping).

Replace the non-return valve.

Low temperature/Different tempera-

tures at different tapping points

Non-return valve in thermostatic mixer in 

the bathroom defective – results in hot 

and cold water mixing. Please note that 

fluctuating temperatures may occur at 

other tapping points in the system!

NB Check all mixers in the house for 

faults/defects!

Replace the mixer or perhaps only the 

non-return valve.

No enough pressure on the hot water

Strainer in the cold water meter or in the 

cold water supply line clogged.

Clean the strainer (cold water meter, in con-

sultation with the water supply company).

Long wait for hot water

Circulation pump out of order (outside 

the unit – not part of the delivery).

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 line clogged.

Clean the filter/dirt strainer.

Hot water temperature too low 

As above.

Non-return valve in the circulation pipe 

defective (results in mixing – the circula-

tion water pipes become cold during 

tapping).

As above.

Replace the non-return valve.

Hot water temperature too high

Defective domestic hot water controller.

Check the functionality of the controller – 

replace if defective.

Temperature falls during tapping

Air in the capillary tube.

Vent the capillary tube.

Temperature falls during tapping

Calified plate heat exchanger.

Plate heat exchanger short-circuited/

defective.

Clean with acid or replace the plate heat 

exchanger.

Replace the plate heat exchanger.

Poor cooling

Calified plate heat exchanger.

Replace the plate heat xchanger or clean it 

with acid.

Discoloured water 

(during a protracted period)

Plate heat exchanger short-circuited.

Replace the plate heat exchanger.

Lack of hot water pressure

Calified plate heat exchanger.

Replace the plate heat exchanger or clean 

it with acid.

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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