Trouble Shooting - Domestic Hot Water - Danfoss Akva Lux II VXi Instructions For Installation And Use Manual

Instructions for installation and use

17. TROUBLE SHOOTING - DOMESTIC HOT WATER

Fundamental
In the event of disruptions to operation, you should fundamentally - before commencing the actual troubleshooting - check
whether:
• the system is correctly connected
• the district heating supply temperature is at its normal level
• the di erential pressure is at its normal level. Ask your district
heating supplier if necessary
Problem
DHW*, no hot water
Temperature too low / variations in
temperature
Lack of hot water pressure
Long wait for hot water
No hot water
Hot water temeprature too low
Hot water temperature too high
Temperature falls during tapping (lack
of capacity)
VI.JV.R1.02
Akva Lux II VXi, VXi Solo HWP, VXi Solo H
• there is a power supply to the system - pump and automatics
• the dirt strainer in the district heating supply pipe is clean
• there is air in the system (if the system is vented)
Possible cause
Non-return valve in the circulation pipe
defective (leads to mixing - the circula-
tion water pipes become cold during
tapping).
Non-return valve in thermostatic mixer
in the bathroom defective - results in hot
and cold water mixing. Please note that
uctuating temperatures may occur at
other tapping points in the system!
NB, Check all mixers in the house for
faults/defects!
Clogged strainer in the cold water meter
or possibly in the cold water supply in
the unit.
Cali ed heat exchanger.
Circulation pump out of order.
Dirt strainer in the district heating sup-
ply line clogged.
Defective DHW controller.
Defective sensor. (PTC2)
As above.
Non-return valve in the circulation pipe
defective (leads to mixing - the circulation
water pipes become cold during ).
Defective domestic hot water controller.
Air in the capillary tube for the di eren-
tial pressure controller.
Cali ed plate heat exchanger.
Solution
Replace the non-return valve.
Replace the mixer or perhaps only the
non-return valve.
Clean the strainer (cold water meter,
in consultation with the water supply
company).
Replace the heat exchanger.
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.
Clean the dirt strainer.
Check controller settings. You may con-
tact Danfoss Redan A/S for further infor-
mation.
Replace sensor.
As above.
Replace non-return valve.
Check the function of the DHW control-
ler and replace if defective.
Vent the capillary pipe.
Replace the plate heat exchanger.
© Danfoss | Produced by Danfoss Redan A/S | 2017.01 | 27