Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 84

Commissioning, inspection, maintenance
Testing the refrigerant circuit
Cylinder
Accumulator 1
Accumulator 2 (compressor)
Compressor
Vessel according to article 4, paragraph 3
Safety components
High pressure switch PSH
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
Visual checks:
Check all components for damage.
■
Check all components and pipes for corrosion.
■
■ Check the outdoor unit interior for oil residue.
■ Check all screw connections for tightness.
■ Check all components containing water for leaks.
■ Check all electrical components and connections for
damage, ageing and tightness.
Check all dampers and brackets.
■
Check that the safety zone requirements are met.
■
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
■
heat exchanger (evaporator) of the outdoor unit".
■ Ensure the condensate can drain freely: See chapter
"Cleaning the condensate pan and the condensate
drain".
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.
84
(cont.)
V PS x V
max
4.1 l
1.1 l
1.5 l
< 1 l
Switching pressure Category
30.3 bar (3.03 MPa)
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
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.
If it is suspected to be unsuitable or fails the tests,
repair the appliance or dispose of it.
For working on the refrigerant circuit: See also chapter
"Checklist for maintenance work".
Note
Use in a commercial environment may be subject to
special regulations incorporating the mentioned main-
tenance work and the Pressure Equipment Directive.
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.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
■ Always observe regulations and guidelines on
handling this type of refrigerant.
■ Work on the refrigerant circuit must only be
carried out by a certified contractor (in accord-
ance with Regulation (EU) No 517/2014 and
2015/2067).
Specialist personnel working on a refrigerant circuit
with flammable refrigerant are required to have specific
qualifications and certification: See "Safety informa-
tion".
Category
max
125 barl
46 barl
34 barl
< 30.3 barl
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