System Settings - Wilo RainSystem AF Comfort Notice De Montage Et De Mise En Service

14 System settings

NOTE: System settings can only be changed by
Wilo after-sales service. When the unit is deliv-
ered, the system is pre-set for safe and reliable
operation and cannot be changed by the operator.
14.1 Displaying the pump configuration
For proper functioning of the unit, the switch-off
pressure of the pump must be adapted to suit the
type of pump in use. The corresponding pump
curve configuration can be viewed in menu 2.50.
• Enable the switchgear using the password 02 for
parameter input.
CAUTION! Danger of damage to the pump! The
pump can be damaged if an incorrect pump
switch-off pressure is selected.
• Read the technical data for the pump in use.
• Compare the pump switch-off pressure in menu
2.50 with the technical data for the pump in use.
The pressure displayed must match the necessary
switch-off pressure. Example: F1 = 4 means
switch-off pressure of 3.9 / 4.1 bar for the pump
MC304.
14.2 Defining the functioning of the level sensor
The level sensor is used for monitoring the water
level in the collector tank and must be configured
accordingly. If the water falls below the level set in
menu 2.09 the unit switches over to potable water
replenishment operating mode. Whilst in potable
water replenishment mode, water is drawn from
the unit's potable water replenishment reservoir.
All menu points necessary for level control are
pre-set at the factory to standard values.
• The level from which potable water replenishment
is to begin when the rainwater level is low can be
set in menu 2.09.
• The top-up level for potable water replenishment
can be defined in menu 2.10.
• Go back to the main menu via menu 2.99.
14.3 Configuring expanded protection functions
The switchgear has a variety of protection func-
tions to ensure proper functioning of the unit.
NOTE: The safety mechanisms and equipment are
pre-set at the factory for safe and reliable opera-
tion and should only be adapted if needed.
Installation and operating instructions RainSystem AF Comfort
14.3.1 Prevention of lime deposits (furring) on
solenoid valve
Due to the relatively low water temperatures,
limescale on the solenoid valve can be virtually
ruled out. Nonetheless the valve is activated/
opened for fully three seconds at certain intervals
to ensure reliable operation.
• The furring protection interval can be changed in
menu 2.16 if needed.
14.3.2 Fault-tolerant software
Under unfavourable conditions (e.g. due to
increased air in the system) the water column at
the pump can break away during rainwater opera-
tion. An internal algorithm (fault-tolerant soft-
ware =>"FTS") will attempt to fill the pump by
opening/closing the solenoid valve on the replen-
ishment reservoir up to 5 times. This procedure is
only possible once per hour.
• The running time tolerance for opening the sole-
noid valve can be set in menu 2.31.
• The running time tolerance for closing the sole-
noid valve can be set in menu 2.32.
14.3.3 Switch-off logic (function F1)
The switch-off logic affects the switch-off pro-
cedure of the pump. The final value (pump off) has
been adapted to the pump curves (e.g. MC 304
with 3.9 bar in rainwater operation and 4.1 bar in
potable water operation). The switch-off pressure
(menu 2.13) is lowered by increments at certain
time intervals. The internal algorithm samples the
operating range until close to the switch-on pres-
sure (menu 2.12) thus determining whether water
feed is required (operation of the pump).
• The time interval for lowering the switch-off
pressure can be set in menu 2.51.
• The increment for lowering the switch-off pres-
sure can be set in menu 2.52.
NOTE: The variable switch-off pressure can be
viewed in menu 2.53 after entering the password
02. The selected switch-off logic can be viewed in
menu 2.50 after entering the password 02.
14.3.4 Flushing the potable water replenishment
reservoir
To prevent the water in the replenishment reser-
voir from stagnating, the unit automatically
switches over to potable water replenishment
after a certain period of time has expired, even if
there is sufficient rainwater available in the col-
lector tank.
The water stored in the potable water replenish-
ment reservoir is thereby regularly changed and
the reservoir flushed out.
• The period of time after which the unit is to oper-
ate in potable water mode can be set in menu
2.19.
• The length of time for which the unit is to operate
in potable water mode can be set in menu 2.20.
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