Troubleshooting; Spare Parts And Service - Remak VCS Installation And Operating Instructions Manual

Troubleshooting

Overheating of the SSR relay internal structure can also
be caused by increased transition resistance at the poles
(terminals), i.e. between the feed conductor and terminal.
Therefore, it is necessary to ensure proper tightening of the
SSR terminal bolts.
Fan Failures
n Check connections of the thermo-contacts.
n Check the condition of the motor circuit breaker .
n Inspect the V-belt.
n Check the fan for free rotation.
n Check connections of the P33N differential
pressure sensor.
n Check the motor current.
n Inspect the frequency inverter
Air-Flow Failure
n Check the condition of the V-belt .
n Check the fan for free rotation.
n Check performance of the differential pressure sensor.
n Check the fan for proper operation and correct
direction of rotation.
n Inspect the frequency inverter.
Failure Signalling – Fire, Smoke
n Check the condition of the fire dampers.
n Check the condition of the connected external device.
Fouled Filters
n Check the filter for fouling. Replace if necessary.
n Check the P33N pressure sensor settings.
Cooling Failure
n Check the condition of the connected cooling unit.
n Inoperative cooling – without failure indication
n Verify the water cooler circulation pump activation and
operation (at active cooling signal above 20% = 2V)
Antifreeze Protection Sensor Failure
n Check the heating water temperature.
n Check the connections of the NS 130R sensor.
n Replace the sensor
Power indicator does not illuminate
n Inspect the supply voltage.
n Inspect the auxiliary circuit breaker.
n Inspect the power supply source fuses
Troubleshooting
When performing any handling or troubleshooting of the air-
handling device, the power supply of the entire distribution
board must be disconnected using the main switch. When
performing inspections, pay increased attention to the correct
functioning of the protection devices (SUMX mixing set, motor
thermo-contacts and electric heater thermo-contacts). Verify
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the correct functioning of evaluating, protection and switching
devices. Check the control signal. Check the terminals for
proper tightening, both on the peripheral device side and
control unit side.
Regular Inspections
Service inspections of the entire air-handling system must be
performed at least twice a year (unit transition from winter to
summer operating mode).
In addition to these, extra inspections must also be performed
after a unit failure, natural disaster or emergencies.
Maintenance of the control unit includes just regular
cleaning and inspection of the screw connections – wires,
grounding, component fixing, etc. Internal parts of the unit
must be cleaned of dust and any other dirt at the specified
maintenance intervals.
If the control unit is equipped with a fan fitted with a filter
(outdoor version), change the filter once a year.
If necessary, clean the face panel of the unit's box using a wet
cloth. Use common cleaners.
If the control unit is equipped with a filter fan (external version),
replace the filter once a year.
When changing over to the summer operating mode, drain
the heating water circuit; the mixing set pump must be
disconnected. To do so, turn the disconnector to the "Off"
position. (Otherwise, ensure regular turning of the pump to
prevent the pump seizing; operating the pump without water
can damage it). In the winter operating mode, the pump must
be activated using the reverse order of steps, i.e. turned "On"
and checked for proper operation.
The same procedure must be performed when the water
cooler is being shut down for a season or reactivated. (Note
that the water cooler pump does not turn the system).

Spare Parts and Service

Spare parts are not included in the VCS unit delivery.
If any spare parts are needed, they can be ordered from the
manufacturer or regional distributor.
Warrantee and regular servicing can be ordered from the
manufacturer or the authorized service provider (see the list
on www.remak.eu).