First EMV 110 502 Series, Manual

Page: 94 / 104

page
94
DTC 200
Trouble shooting guide
TROUBLE POSSIBLE FAILURE REMEDY
-
Power supply is not connected - Check power supply
- Selector switch is in position OFF - Set the selector switch in position
AUTO
-
DHWT sensors T2 or T4 are
disconnected
-
Check sensor
The pumps are not operating
irrespective of temperature
- Collector sensor T1 or T3 are short
circuited - Check sensor
- Selector switch is in position ON1 or
ON2
- Set the selector switch in position
AUTO
- Collector sensor T1 or T3 are
disconnected - Check sensor
The pumps are operating
permanently irrespective of
temperature
- DHWT sensor T2 or T4 are short
circuited - Check sensor
Temperature regulation of DHW tank
is not working - Motorised ball valve is permanently
open or nonreturn valve is open
(thermosiohon water circulation is
enabled)
- Check the installation
In spite of enough collector’s energy
the water temperature in DHWT is
not high enough – water is too cold - Setting of DHWT temperature is too
low
- The difference setting is set to high
- Check settings
The temperature is reached, but the
heating/cooling is still running - Jumpers are not set correctly - Check jumper’s settings
In AUTO position nothing happens - Jumpers are pulled out - Set jumpers in suitable position
In solar heating systems motor actuated ball valves can prevent
various inconveniences.
o Effectively prevent hydraulic shocks in systems as they require
30 seconds for complete opening.
o Due to their shape they do not impede the flow.
o Springs are not included, therefore noise does not appear.
o When closed, 100% sealing is guaranteed.
o They have an output for pump up to 100 W in open position,
therefore they do not present a hydraulic load for pump in
closed position. They enable pump switching on only in
completely open position.
o Due to installed RELAY module they enable control with make
contact only.
o If during closing or opening process impurities enter in valve,
which could block it, the valve stops and immediately afterwards
continues with opening or closing process in opposite direction,
so that water flow can rinse the impurities up to cleaning net
(anti-blocking system).
o Possibility of manual control. This function relieves airing the
system or filling the system with water.
o It prevents coaxial cooling of DHWT by one pipe in night-time.
For preventing coaxial
cooling in night-time it is
necessary to build in
motorised ball valve EMV
110... in heating pipe of
DHW tank exchanger.
In night-time the temperature of water in DHWT is
usually higher than in collector. In this case it is
possible coaxial cooling of the DHWT through one
pipe. If the pipe has enough diameters and it is
straight and vertical, then water circulation begins
in just one pipe. In the middle, water goes up-
wards, and at the edges downwards.
One solution for this is to build in nonreturn valve.
But with its use is increased the load of pump, the
flow reduced, and the ventilation of the system hin-
dered.
All these problems are solved by the motorised
ball valve series EMV 110 ...
HOT WATER
COLD WATER
EMV 110 602/4230
EMV 110 502/7930
EMV 110 316/89I0
Advantages of motor actuated ball valves of EMV110..series with incorporated
relay module for solar heating systems