Elwa NANO 38, Инструкции по эксплуатации и монтажу, Страница: 8 / 10

8
Trouble Shooting Examples
The NANO does not switch on when opening the tap fully.
Causes
- This problem is usually caused by lack of water flow problems. Ensure the pressure on the
cold water supply is over 60kPa, while the NANO is in use and the flow rate is sufficient
to turn the heating elements on.
- Too much back pressure in tap-outlets or shower heads after the NANO, causing lack of
pressure differential over the NANO (back-pressure through the cold)
- Maximum temperature/overpressure cut-out switch is activated. This if most likely due to
air in the NANO not cleared before switching on the electrical supply, or the mains
incoming water pressure is too high.
Remedy
- Fix the water pressure problems; remove any flow restrictions from fixtures such as
shower-heads and tap outlets.
- Switch the electric power supply off; make sure there is no power on any of the terminals
- Check continuity over the safety switch terminals. If there is no continuity over the
contacts, push the reset button on the safety switch.
- Seek electrical assistance to check power supply on all phases and continuity all the way
to the electric elements, and to measure element resistance.
The water that is coming out of the NANO is not warm enough.
Cause
- The incoming water is very cold (below 12°C) and/or the total flow is too high.
Remedy
- A flow restrictor can be installed or an inline (additional) ball valve in the cold water
supply to the NANO to enable you to reduce the flow and so increase the delivery
temperature. Be aware not to reduce the flow too much, if the hot water outlet temperature
is too high will trip the over-temperature safety switch.
The heating of water stops when trying to mix cold water to get the required
outlet temperature
Causes
- Aerator/restrictor in nozzle of outlet causing too much back pressure
- Incorrectly balanced flow restrictor in the supply line, pressure limiter installed in the
wrong place, not reducing the pressure of the cold water to the taps
- Pressure and/or flow in the cold supply line is less than the required minimum pressure for
the NANO to switch on.
Remedy
- Remove the restrictions in the tap-aerator or shower-head.