Indicator Lights And Button; Inlet Water System - Dometic RO400 Service Manual

indiCatOR ligHts and ButtOn

On the control panel of the water purifier there are seven indicator lights (diods,
LEDs) and one push button, see fig. F.
stop
The product has stopped working. 'stop' alone or
with another diod gives an error code indicating the fault.
filter i Change prefilter/s/.
Too low pressure at the inlet, caused by blocked filters/s/,
low water supply pressure e.g.
on/off Indicates that the product is switched on (power on).
filter ii Change prefilter/s/.
filter/s/ consumed due to time in use.
purification level i
Low purification level.
purification level ii
Good purification level.
purification level iii High purification level.
calibration button Push button to
- calibrate levels for purification level,
- reset timer function of 'filter II',
- enter varios modes and control
functions useful during service.
for more information about indications, see "
Indicator lights
An accessorie, see fig. G, aimed for products installed under kitchen sink when
control panel is not always visable. It is intended to be mounted below the drinking
water faucet and connected to the indicator contact on the product backside.
- Green light indicate 'purification level II / III'.
- Red light indicate 'purification level I'
In the following, the letters/numbers within brackets refer to figure.

inlet wateR system

The inlet hose is connected to the inlet valve (e22) (normally closed). When the
outlet pressure sensor (e26) detects a low pressure (lower than the preset start pres-
sure), does the printed circuit board (PcB) (B5) energize the inlet valve, and the
valve opens (and the motor starts). The inlet valve includes a screen filter, for a first
coarse particle filtration.
The inlet water flows to the integrated prefilters (B3, B4) that consist of two filter
cartridges, configured in
- serial flow (in most RO400-models) or
- parallell flow (in most RO600-models)
The purpose of the prefiltration is to protect the membrane (J), from mechanical and
chemical wearing. Better prefiltration gives longer service life of the membrane and
the product overall.
In serial flow does the prefiltration consist of one particle (sediment) filter (h1) and
one granulated activated carbon (GAC) filter (h2). The particle filter removes par-
ticles larger than approx 10 µm. The carbon filter reduces Chlorine (Cl
important as the surface the membrane otherwise is damaged by chlorine over time.
In parallell flow does the prefiltration consist of two identical carbon block filters
(h3). The carbon block combines particle removal (larger than approx 5 µm) and
Chlorine reduction in one cartridge. The advantage of parallell flow is the lower
pressure drop, which becomes more important at high water flow (RO600 compared
with RO400). The finer particle filtration gives an improvement not only on the
membrane service life, but also the integrated high pressure pump (e20).
pROduCt desCRiptiOn
TROUBlEShOOTINg
- 11 -
".
), which is
2
F
G
Indicator lights
H
2
1
3
1. Particle filter
2. granulated Activated
Carbon (GAC) filter
3. Carbon block filter