15 Troubleshooting
Installation and operation manual
26
VAM350~2000J8VEB
Heat reclaim ventilation unit
4P664011-1 – 2021.08
Installation
Check that the unit is properly installed, to avoid abnormal
noises and vibrations when starting up the unit.
Power supply voltage
Check the power supply voltage on the local supply panel.
The voltage MUST correspond to the voltage on the
nameplate of the unit.
Earth wiring
Be sure that the earth wires have been connected
properly and that the earth terminals are tightened.
Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 MΩ or more is attained by applying a
voltage of 500 V DC between power terminals and earth.
NEVER use the megatester for the transmission wiring.
Internal wiring
Visually check the electrical component box and the
inside of the unit for loose connections or damaged
electrical components.
Air inlet/outlet
Check that the air inlet and outlet of the unit is NOT
obstructed by paper sheets, cardboard, or any other
material.
Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally
installed protection devices are of the size and type
specified in the chapter
Be sure that neither a fuse nor a protection device has
been bypassed.
Field wiring
Be sure that the field wiring has been carried out
according to the instructions described in
13], according to the wiring diagrams and
according to the applicable legislation.
Installation date and field setting
Be sure to keep a record of the installation date on the
sticker on the rear of the front panel according to
EN60335‑2‑80 and keep record of the contents of the field
setting(s).
EKVDX
In case an EKVDX is installed, also see chapter
Commissioning in the EKVDX installation and operation
manual.
14.2
Checklist during commissioning
To perform a
test run
.
14.2.1
About the test run
After completing the installation of the system, turn on the power of
the heat reclaim ventilation units. Refer to the manual of the
controller of each unit (controller for air conditioner, central
controller, etc.) to conduct a trial operation.
15
Troubleshooting
15.1
Solving problems based on error
codes
In case a malfunction code is shown on the display, consult the
dealer where the unit was purchased.
15.1.1
Error codes: Overview
Code
(a)
Description
EEPROM failure
Locked rotor
Unstable fan rpm: failure of filter contamination check
or failure of function 19(29)-0-04/-05
VAM air flow rate dropped below legal threshold limit
(for R32 application)
(b)
VAM air flow rate approaches legal threshold limit (for
R32 application)
(b)
VAM warning for air flow rate drop (for R32
application)
(b)
Power supply malfunction
Capacity setting malfunction
Fan communication error
Malfunction of fan motor sensor or fan control driver
CO
2
sensor warning
Transmission error between unit and controller
Transmission error between master controller and
slave controller
(c)
Wrong controller installed
Repeated central address
Transmission error between unit and central controller
Miscommunication between VAM and EKVDX
External protection device activated
Indoor air thermistor (R1T) malfunction
Indoor air thermistor (R1T) out of operation range
Outdoor air thermistor (R2T) malfunction
Outdoor air thermistor (R2T) out of operation range
Functions 19(29)-0-04/-05 not possible due to low
outdoor temperature
Damper-related malfunction
(a)
In case of a code with a grey background, the VAM still operates.
Inspect and repair the unit as soon as possible.
When connected to an EKVDX and the R32 safety system is
active, the VAM can stop operating.
(b)
These error codes only apply when the R32 safety system is
active. See Installation and operation manual of the EKVDX for
more information about recovery of these errors.
(c)
When combined with the EKVDX, no slave controllers are
allowed.
16
Disposal
NOTICE
Do NOT try to dismantle the system yourself: dismantling
of the system, treatment of the refrigerant, oil and other
parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for
reuse, recycling and recovery.
