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7.2 Troubleshooting DHW

Problem

Possible cause

Solution

Strainer in supply or return line clogged.

Clean strainer(s).

DHW circulation pump out of order or with
too low setting.

Check circulation pump.

Defective or clogged non-return valve.

Replace – clean.

No electricity.

Check.

Wrong setting of automatic controls, if any.

To adjust an electronic controller for
DHW, pls. note enclosed instructions for
electronic controller.

Scaling of the plate heat exchanger.

Replace – rinse out.

Defective motorized valve.

Check (use manual function) – replace.

Defective temperature sensors.

Check – replace.

Too little or no DHW.

Defective controller.

Check – replace.

DCW is being mixed with the DHW, e.g. in a
defective thermostatic mixing valve.

Check – replace.

Hot water in some taps but not in all.

Defective or clogged non-return valve on
circulation valve.

Replace – clean.

Tap temperature too high; DHW tap load
too high.

Thermostatic valve adjusted to a too high
level.

Check – set.

Scaling of the plate heat exchanger.

Replace – rinse out.

Temperature drop during tapping.

Larger DHW flow than the substation has
been designed for.

Reduce DHW flow.

Thermostatic control valve does not close

Temperature difference between DH
supply and DHW set point too low.

Lower the set point temperature or increase
the DH supply temperature.

18 | © Danfoss | 2019.01

VI.CW.Y5.02 / LUK42260

Operating Guide Termix VMTD MIX Compact 28

Содержание Termix VMTD MIX Compact 28

Страница 1: ...up 6 4 3 Electrical connections 7 5 0 Design 8 5 1 Design 8 5 2 Schematic diagram 9 6 0 Controls 10 6 1 Heating circuit 10 6 2 DHW temperature control 13 6 3 Other 15 6 4 Maintenance 16 7 0 Troublesh...

Страница 2: ...conditions for radiator thermostats in order to enable individual temperature control in each room nThe mixing loop creates a suitable temperature level for the heating system Domestic hot water DHW T...

Страница 3: ...the substation inform the operating personnel and call for expert help immediately REACH All Danfoss A S products fulfill the requirements in REACH One of the obligations in REACH is to inform custom...

Страница 4: ...2 District heating DH return 3 Heating HE supply 4 Heating HE return 5 Domestic hot water DHW 6 Domestic cold water DCW 7 Hot water circulation HWC Connection sizes DH HE G 1 int thread DCW DHW G 1 i...

Страница 5: ...bstation pipes and connections should be cleaned and rinsed Tightening Due to vibration during transport all substation connections must be checked and tightened before installation Unused connections...

Страница 6: ...thighten connections After water has been added to the system and the system has been put into operation re tighten ALL connections Pump The pump must be switched off during system fill Under floor he...

Страница 7: ...st be electrically connected so that it can be disconnected for repairs Outdoor temperature sensor Outdoor sensors should be mounted so as to avoid exposure to direct sunlight They should not be place...

Страница 8: ...er DHW 11 Domestic hot water pump 30 Flow controller with integrated control valve F Electronic controller 25 Pressure gauge with ball valve 48 Air vent manual 2 Single check valve 27A Actuator HE 10...

Страница 9: ...19 Surface sensor 40 Immersion sensor 9 Strainer 24 Delivered loose with unit 48 Air vent manual 10 Circulator pump DHW Domestic Hot Water DCW Domestic Cold Water HWC Hot Water Circulation DH Supply...

Страница 10: ...ntrolled by the HE temperature controller 6 1 3 AVTB controller 30 100 The temperature setting is as follows 1 35 C 2 55 C 3 75 C 4 95 C 5 100 C The values are intended as a guide Thermostatic control...

Страница 11: ...closes when set max flow is exceeded and can be used in combination with Danfoss electrical actuators with or with out safety function Spring return motor can be used as safety function by power fail...

Страница 12: ...elected via user interface EuP 2015 Ready The MAGNA3 circulator pumps are designed for circulating liquids in heating systems with variable flows where you want to optimise the setting of the pump dut...

Страница 13: ...atures of up to 90 C Thermostatic control DHW temperature is adjusted as follows To increase temperature turn the handle on the thermostatic controller to select a higher number To decrease temperatur...

Страница 14: ...in the event of power failure 6 2 4 Domestic hot water pump Important It is necessary to mount a domestic hot water circulation pump on the water heater to avoid regulation problems The circulation pu...

Страница 15: ...should be cleaned regularly by authorized personnel The frequency of cleaning would depend on operating conditions and the manufacturer s instructions VI CW Y5 02 LUK42260 Danfoss 2019 01 15 Operatin...

Страница 16: ...H supply temperature and DHW temperature Connections Checking all connections for leakages Safety valves The operation of the safety valves should be checked by turning the valve head in the indicated...

Страница 17: ...re of the DH is at the normal level summer at least 60 C winter at least 70 C the differential pressure is equal to or higher than the normal local differential pressure in the DH network if in doubt...

Страница 18: ...tle or no DHW Defective controller Check replace DCW is being mixed with the DHW e g in a defective thermostatic mixing valve Check replace Hot water in some taps but not in all Defective or clogged n...

Страница 19: ...the installation thoroughly Limiting of the return temperature adjusted too low Adjust according to instructions Defective radiator valves Check replace Uneven heat distribution in building because o...

Страница 20: ...e pipe loop The system should feature electronic controls as well as return sensors Pump pressure too high Adjust pump to a lower level Air in system Vent the system Defective or incorrectly set radia...

Страница 21: ...should be dismantled and its components sorted if possible in various groups before recycling or disposal Always follow the local disposal regulations VI CW Y5 02 LUK42260 Danfoss 2019 01 21 Operatin...

Страница 22: ...22 Danfoss 2019 01 VI CW Y5 02 LUK42260 Operating Guide Termix VMTD MIX Compact 28...

Страница 23: ...8 0 Declaration 8 1 Declaration of conformity Category 0 with electrical equipment VI CW Y5 02 LUK42260 Danfoss 2019 01 23 Operating Guide Termix VMTD MIX Compact 28...

Страница 24: ...24 Danfoss 2019 01 VI CW Y5 02 LUK42260 Operating Guide Termix VMTD MIX Compact 28...

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