Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 138

Outdoor unit maintenance
Checklist for maintenance work
Measure
Ventilating the work location
%
Carry out repairs outdoors, or provide adequate ventilation for
■
the work location before interfering with the refrigerant circuit or
commencing any welding or brazing/soldering work.
The ventilation must be maintained for the entire duration of the
■
work. The ventilation should dilute any refrigerant that may es-
cape and should ideally discharge it into the surrounding atmos-
phere.
Checking the refrigeration system
&
Any replacement electrical components must be suitable for the
■
application and must correspond to the manufacturer's specifi-
cation. Only replace faulty components with genuine Viessmann
spare parts.
Carry out all component replacements in accordance with Viess-
■
mann guidelines. If required, consult Viessmann Technical Serv-
ice.
Perform the following checks:
The refrigerant charge must not be greater than specified in the
■
technical data.
If a hydraulically separated system is used, check the secondary
■
circuit for the presence of any refrigerant.
Labels and symbols must always be clearly visible and legible.
■
Replace any illegible information.
Refrigerant lines and components must be installed in such a
■
manner that they do not come into contact with substances that
can cause corrosion.
Exception: The refrigerant lines are made from corrosion-resist-
ant materials or are reliably protected against corrosion.
Checks on electrical components
/
Safety checks must be carried out for maintenance and repair
■
work on electrical components: See below.
In the event of a safety-related fault, do not connect the system
■
until the fault has been remedied.
If it is not possible to remove the fault immediately, provide a
suitable interim solution for the system's operation if required.
Inform the system operator.
Carry out the following safety checks:
Discharge the capacitors: Ensure no sparks are created when
■
discharging.
Do not position any live electrical components or cables in the
■
immediate vicinity of the outdoor unit when filling or extracting
refrigerant or when flushing the refrigerant circuit.
Check the earth connection.
■
138
(cont.)
Completed Comments