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9. SERVICING
9.1 PROCEDURES IN CASE OF DEFECTS
VR Mini, VR Mini 3, VR1, VR2, VR3, VR4,
VR-D
Problem
Check points
Description
Heat exchanger leaking
● assembly of the exchanger connections with two wrenches (adjustment), which
safeguards against internal twisting of the collectors,
● Check if the leakage may be associated with mechanical damage to the
exchanger,
● Vent valve or drain plug leaking,
● Heating agent parameters (pressure and temperature) – should not exceed
permitted values,
● type of heating agent (it cannot be aggressive to Al and Cu),
● Circumstances when the leakage appears (e.g. during the first, tentative
installation start-up, when the installation is filled up after the heating agent
has been drained) and outside temperature at the time of failure (risk that the
exchanger may freeze),
● Possibility of operating in aggressive conditions (e.g. high concentration of
ammonia in the air in a sewage-treatment plant),
Pay special attention that the exchanger may freeze during winter
time. 99% of registered leakages appear during installation start-up/
pressure tests. The defect can be removed by pulling back vent or
drain valve.
Fan works too loud
● check the device assembly for conformity with the instructions in operation and
maintenance manual (e.g. distance from wall/ceiling),
min. 40 cm
● Device appropriately level led,
● Correctness of electric connections and qualifications of the wireman,
● Inlet current parameters (e.g. voltage, frequency),
● use of rotation controller different from ARW,
● noise at lower gears (possible controller failure?),
● Noise only at higher gears (regular situation explained by aerodynamic
characteristics of the device, if there outlet air chokes),
● type of other devices operating in the building (e.g. induced draught fans) –
intensified noise caused by simultaneous operation of many machines,
● Does the fan rub against the casing?
● Is the fan evenly screwed to the casing?
Level of operating noise of VOLCANO devices is perceived
subjectively. If the device is made of plastic, it should operate
quietly.It is recommended to unscrew the clamping screws and
tightening them up again. If the fault does not disappear, you should
make a complaint.
Fan does not work
● Correctness and quality of electric connections and qualifications of the wireman,
● Is there an additional bridge between required engine terminals (diagram in the
manual)
– U1 – TK (TB),
● Inlet current parameters (e.g. voltage, frequency) on the clamp block of fan
engine,
● Correctness of operation of other devices installed in the building,
● Correctness of wire connections on the engine side acc. to the manual, in
comparison to wires clamped in the engine terminal strip,
● PE conductor voltage (if present, may mean there is a break-down),
● Is N conductor correctly connected to the fan or ARW or is the connection of U2
clamps on the motor and ARW made correctly?
Electrical connection need to be done strictly according to the
drawings in the manual. If there is no bridge between U1 and
TK(TB) clamps, the motor lacks thermal protection and may break
– burn.
● damage or installation of controller different from ARW,
It is recommended to check the device/ speed controller by
connecting the heater directly to power supply.
Damaged casing
● Circumstances when it was damaged – notes on the bill of ladings, stock issue
confirmation, condition of the box,
If the casing is damaged, make photos of the box and device, and
photos confirming that the device serial number on the device
and on the box are the same. If the device was damaged during
transport, it is necessary to write down an appropriate statement by
the driver, who delivered the damaged device.
ARW
– rotation controller
does not work/ it is burned
● Correctness – quality of electric connections (wires accurately positioned
in electric clamps, cross-section and the material wires are made of) and
qualifications of the wireman,
● Only 1 controller connected to 1 device,
● Inlet current parameters (e.g. voltage, frequency),
● Correctness of VOLCANO operation after connecting “in short” (skipping ARW, i.e.
connections L and TB, N and U2, PE and PE) to the power network,
● Check if the user did not damage the knob, e.g. rotating it around
For the TRANSRATE controller, the following must also be
checked:
● circuit breaker,
● correctness of connection to the SCR10 controller,
● use of shielded conductors,
● control conductors, which should be located away from the
working conductors
Actuator does not open
the valve
● Correctness of electric connections and qualifications of the wireman,
● Correctness of the thermostat operation (characteristic tick sound during change-
over),
● Inlet current parameters (e.g. voltage),
The most important is to check whether the actuator responded
to the electric impulse within 11s. If the motor is damaged, you
need to make a complain and switch actuator operation to manual
(MAN), which mechanically opens the valve.
Programmable thermostat
does not send any signals
to the actuator/ controls
the operation of the
heating system wrongly
● Correctness of electric connections and qualifications of the wireman,
● Correctness of the thermostat operation (characteristic tick sound during switch-
over),
● Connecting a few motor of VOLCANO devices directly to the thermostat
(permitted only if contactor is used!),
● Inlet current parameters (e.g. voltage),
● Programming method exactly the same as in the manual on
● When was the last time the sensor was calibrated?
RDE thermostat is powered by batteries, that need to be replaced
(every 2 years). Also, the sensor needs to be periodically calibrated
– detailed information can be found on: www.vtsgroup.com
Complaint is unjustified, if the RDE thermostat was directly
connected to the motor, without a contactor. If the sensor incorrectly
measures the temperature, it should be calibrated (instructions in
the catalogue).
EN
Summary of Contents for VOLCANO VR Mini
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