Maintenance - Wilo Comfort Co R-Mvi Serie Manual Del Usuario

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9 Maintenance

To guarantee maximum operational reliability at
the lowest possible operating cost, we recom-
mend regular inspection and maintenance of the
pressure boosting system (see DIN 1988). It is
advisable to conclude a maintenance contract
with a specialist company or with our central cus-
tomer service department. The following checks
should be made regularly:
• Inspection of the operational readiness of the
pressure boosting system.
• Check the mechanical seals on the pumps. The
mechanical seals need water for lubrication and
this can leak out of the seal slightly. If this is
noticeable, replace the mechanical seal.
• Check the diaphragm pressure vessel (optional or
accessory) (a 3-monthly cycle is recommended)
for correct supply pressure setting and imperme-
ability (see Fig. 3 and 4).
Caution! Risk of material damage!
If the supply pressure is incorrect, the function
of the diaphragm pressure vessel is not guaran-
teed, which increases the diaphragm wear and
can cause system faults.
To check the supply pressure:
• depressurise the vessel on the water side (close
the flow-through fixture (A, Fig. 3) and allow the
residual water to drain (B, Fig. 3),
Fault
Pump(s) do not start
20
Cause
No mains voltage
Main switch "OFF"
Water level in break tank too low, i.e. low
water level reached
Low water level indicated
Low water cut-out switch or pressure
sensor on the intake side is faulty
Electrodes connected incorrectly or
pressure for low water cut-out switch
set incorrectly
Inlet pressure is above start-up pressure Check default values and correct if necessary
Shut-off device is closed at pressure
sensor
Start-up pressure set too high
Fuse defective
Motor protection has triggered
Power contactor is defective
Turn-to-turn fault in the motor
• check the gas pressure at the diaphragm pressure
vessel valve (top; remove dust cap) with an air
pressure gauge (Fig. 3, C), and
• if necessary, correct the pressure by adding
nitrogen (PN 2 = pump start-up pressure Pmin
minus 0.2 – 0.5 bar or value specified in the table
on the vessel (Fig. 4) – Wilo customer service). If
the pressure is too high, discharge nitrogen from
the valve.
In the case of system with a frequency converter,
the inlet and outlet filter of the fan must be
cleaned if they are very dirty.
If the system is at a standstill for a long period due
to decommissioning, proceed as described in 8.1
and drain each pump by opening the drain plug on
the pump support foot.
10 Faults, causes and remedies
Faults, particularly those affecting the pumps or
the control system, should only be remedied by
Wilo's customer service or a specialist company.
NOTICE!
The general safety instructions absolutely must
be observed during any maintenance or repair
work! The installation and operating instructions
of the pumps and the control device must also be
observed!
Remedy
Check the fuses, cables and connections
Switch on the main switch
Check the break tank's inlet valve / supply line
Check the inlet pressure and the level in the
break tank
Check and, if necessary, replace the low water
switch or pressure sensor
Check installation and setting and correct as
required
Check and open the shut-off device if necessary
Check the setting and correct if necessary
Check fuses and replace if necessary
Check the default values against the pump or
motor data, measure the current values and cor-
rect the setting if necessary. Check the motor
for defects and replace if necessary
Check it and replace it if necessary
Check, if necessary replace motor or have it
repaired
WILO SE 07/2017