Low Pressure Restart - Dometic RO400 Service Manual

lOw pRessuRe RestaRt

This function is included only in commercial (c-) models.
In commercial applications it is common that the water purifier operates automati-
cally towards a connected external equipment. An alarm stop may cause troubles
before it is noticed by the user.
The reason for the alarm is sometimes a temporary pressure drop in the inlet water
pressure. Examples could be roadwork, momentaneous high water consumption
near the the installation, mistake by a co-worker to close the water supply etc.
The purpose of this function is to avoid these unnecessary alarms, and allow the
product to automatically restart after an alarm from low inlet pressure.
The water purifier will make three attempts to restart: After 3 minutes, 20 minutes
and finally 4 hours. If the pressure is not sufficient after three attempts the water
purifier stop permanentely.
noTe! This function does not feel the difference between low inlet pressure
and for example blocked prefilters. in the latter case will the restarts attempts
not help.
indiCatiOn
Diods for 'filter I' and 'stop' blinks alternately.
Slow 'filter I' Awaiting 1st restart
Quick 'stop' (after 3 minutes)
Medium 'filter I' Awaiting 2nd restart
Medium 'stop' (after further 20 minutes)
Quick 'filter I' Awaiting 3rd and last restart
Slow 'stop' (after further 4 hours)
pROduCt desCRiptiOn
fault Case
Only included in commercial (c-)
models.
The product has stopped due to low
inlet pressure detected by the inlet
pressure sensor.
The system is idle waiting for auto-
matic restart.
low pressure stop (same indication
for all models).
In commercial (c-) models this
means that the product has made
three unsuccessful restart attempts.
- 15 -
CAUTION
when idle in restart mode, the wa-
ter purifier may start unexpected.
Thus, the cover or casing may not
be removed when the product is
idle in restart mode.
Remedial aCtiOn
Attend the problem according to the
" " guide.
TROUBlEShOOTINg
Press and hold the 'calibration' but-
ton until the warning lights goes out,
and the product will restart.