11. Other information - Cleaning
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– WTS-300-E - V4.1 - 20.01.2022
Page 149
11.8 Function of pressure switch
– Effect on pump and heater
A pressure switch fitted to the washing circuit can protect the pump and heater from
damage.
Protection of the cleaning pump
Parameter [r11] can be used to set the length of time during which there may be no
pressure in the washing line before washing is stopped. This prevents the washing
pump being damaged by running dry.
Protection of heater
Parameter [r38] can be used to set the length of time during which there may be no
pressure in the washing line before the heater is switched off. Washing continues
nevertheless. This prevents heater burn-out.
11.9 Air in the cleaning pump -> automatic venting
If there is air in the washing line when the washing pump starts, it is impossible for
the pump to circulate the washing water. The remedy: short switch-on and switch-
off impulses when the pump starts can remove air bubbles.
The number of impulses and the time interval between them must be set.
Parameter [r80] - Setting 1 =
On/off impulse with fixed quantity for all cleaning stages.
r81
- Number of switch-on and switch-off impulses
r82
- Duration of switch-on impulses
A
r83
- Duration of switch-on impulses
B
Parameter [r80] - Setting 2 =
as 1 - however, premature termination when pressure via pressure switch
After each switch-on impulse, the pressure switch is contacted. If no pressure has
been built up, a further impulse interval follows. If there is pressure in the line the
washing pump switches on and runs continuously. Parameter [r81] is used to limit
the maximum number of impulses.
r81
- Max. number of switch-on and switch-off impulses
r82
- Duration of switch-on impulses
A
r83
- Duration of switch-on impulses
B
Parameter [r80] - Setting 3 or 4
If permanent impulses of the cleaning pump are requested (improved rinsing effect)
in the rinsing steps (rinsing cycles 0 and 9) select settings 3 and 4.
NB:
During automatic venting with pressure switch evaluation, parameters [r11] and [r38]
do not come into play.
The digital input in parameter [A25] (5=Pressure switch water "Default setting") is
used directly for evaluation.
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NOTICE
