118
Cylinder V
max
PS x V
max
Category
Accumulator 1 4.5 l 136.35 barl II
Compressor 4.4 l 133.32 barl II
Vessel according to article 4, paragraph 3 < 1 l < 30.3 barl —
Safety components Switching pressure Category
High pressure switch PSH 30.3 bar (3.03 MPa) IV
PS Permissible operating pressure: See "Specifica-
tion".
Maintain pressure equipment and safety equipment
according to the local and national regulations and
guidelines.
Recommended annual maintenance for outdoor
units with 1 and 2 fans
Visual checks:
■
Check all components for damage.
■
Check all components and pipes for corrosion.
■
Check insulation materials for damage and ageing.
■
Check the outdoor unit interior for oil residue.
■
Check all screw connections for firm seating.
■
Check all components containing water for leaks.
■
Check all electrical components and connections for
damage, ageing and firm seating.
■
Check all dampers and brackets.
■
Check that the safety zone requirements are met.
Repairs:
■
Rectify any defects found during the visual inspec-
tion.
If necessary replace components, gaskets and insu-
lation.
■
Observe regulations and specifications for working
on the refrigerant circuit.
See also chapter "Checklist for maintenance work".
Cleaning work:
■
Clean the filter in the outdoor unit return: See chap-
ter "Cleaning the filter in the ball valve".
■
Clean the cladding of the external panels and the
interior of the outdoor unit.
■
Clean the evaporator: See chapter "Cleaning the
outdoor unit heat exchanger (evaporator)".
■
Ensure the condensate can drain freely: See chapter
"Cleaning the condensate pan and condensate
drain".
Further tests:
■
Leak test: See chapter "Checking the refrigerant cir-
cuit for leaks".
■
Test the quality of the heating water: See chapter
"Fill and top-up water".
Maintenance after max. 12 years for outdoor units
with 1 and 2 fans
Due to the refrigerant R290, a special test and service
of pressure equipment and safety equipment is
required after 12 years. The test may require replacing
components.
Repair or dispose of the outdoor unit in the following
cases:
■
If it is suspected that the components are no longer
suitable for safe operation.
■
If the components do not pass the inspection.
For working on the refrigerant circuit: See also chapter
"Checklist for maintenance work".
Note
The specified maintenance work and the Pressure
Equipment Directive must also be complied with for
commercial use. Any additional regulations for com-
mercial use must also be observed.
■
Test the safety chain annually: Request information
about the test procedure from Viessmann Technical
Service.
■
Replace the high pressure switch PSH at least every
12 years.
■
Replace the high limit safety cut-out at least every
12 years.
Checking the refrigerant circuit for leaks
Check the connections for refrigerant leaks. Danger
Direct contact with refrigerant can be harmful to
the skin.
Wear safety goggles and protective gloves when
working on the refrigerant circuit.
Commissioning, inspection, maintenance
Testing the refrigerant circuit (cont.)
6222080
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