84
Measure Completed Comments
(
Repairs on sealed enclosures
■
When carrying out work on sealed components, fully isolate the
appliance from the power supply, also before removing sealed
covers.
■
If a power supply is absolutely necessary during the work: Posi-
tion a continuously operating refrigerant detector in the most
critical locations, to provide warning of any potentially danger-
ous situation.
■
Ensure in particular that any work on electrical components
does not lead to any changes to the enclosures that would affect
their protective properties. This includes:
–
Damage to cables/leads
–
Too many connections on one terminal block
–
Connections that do not comply with the manufacturer's speci-
fications
–
Damage to gaskets/seals
–
Incorrect installation of cable entries/grommets
■
Ensure the appliance is correctly installed.
■
Check that the seals have settled. Ensure by checking that the
seals reliably prevent the ingress of a flammable atmosphere.
Replace defective seals.
!
Please note
Silicone as a sealant can affect the function of leak detec-
tion devices.
Do not use silicone as a sealant.
■
Individual parts must comply with the manufacturer's specifica-
tions.
■
Work on components which are suitable for flammable atmos-
pheres: It is not imperative that these components are isolated
from the power supply.
)
Repairs on components that are suitable for flammable at-
mospheres
■
Do not connect any continuous capacitive or inductive loads to
the appliance, unless it has been ensured that the permissible
voltages and currents are not exceeded.
■
In areas where flammable atmospheres exist, only apply voltage
to components which are suitable for flammable atmospheres.
■
Only use Viessmann original parts or parts approved by Viess-
mann. Other parts may result in refrigerant becoming ignited in
the event of a leak.
aÖ
Wiring
■
Check whether the wiring is subject to wear, corrosion, tension,
vibration, sharp edges or other unfavourable environmental in-
fluences.
■
When checking, also take into account the effects of ageing and
continuous vibration on the compressor and fans.
aA
Refrigerant detectors
■
On no account use possible sources of ignition for refrigerant
detection or leak detection.
■
Flame leak detectors or other detectors with open flames must
not be used.
Maintenance
Checklist for maintenance work (cont.)
6199592
Maintenance
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