Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 139

Checklist for maintenance work
Measure
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.
Pay special attention to ensuring that any work on electrical
■
components does not lead to any changes to the enclosures
that would affect their protective properties. This includes dam-
age to leads, too many connections on a single terminal, con-
nections that do not correspond to the manufacturer's specifica-
tion, damage to seals, as well as incorrect installation of cable
entries.
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.
Spare parts must correspond to 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.
Wiring
aÖ
Check whether the wiring is subject to wear, corrosion, tension,
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vibration, sharp edges or other unfavourable environmental in-
fluences.
When checking, also take into account the effects of ageing and
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continuous vibration on the compressor and fans.
Refrigerant detectors
aA
On no account use possible ignition sources for refrigerant de-
■
tection or leak detection.
Flame leak detectors or other detectors with open flames must
■
not be used.
(cont.)
Outdoor unit maintenance
Completed Comments
139