Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 140

Outdoor unit maintenance
Checklist for maintenance work
Measure
Leak detection
aS
The following leak detection processes are suitable for appliances
with flammable refrigerant:
Leak detection with electronic refrigerant detectors:
Electronic refrigerant detectors may not have the required sensi-
■
tivity or may need to be calibrated to the relevant range. Carry
out the calibration in refrigerant-free surroundings.
The refrigerant detector must be suitable for the R290 refriger-
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ant to be detected.
The refrigerant detector must not contain any potential ignition
■
sources.
Calibrate the refrigerant detector to the refrigerant used. Set the
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response threshold to < 3 g/a, suitable for propane.
Leak detection with liquid leak detectors:
Liquid leak detectors are suitable for use with most refrigerants.
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!
Please note
Liquid leak detectors containing chlorine may react with
the refrigerant. This could result in corrosion.
Do not use liquid leak detectors that contain chlorine.
Measures to take if a leak in the refrigerant circuit occurs or is
suspected:
Immediately extinguish all open flames in the vicinity of the heat
■
pump.
If brazing/soldering work needs to be undertaken to remedy the
■
leak, always extract all the refrigerant from the refrigerant circuit.
Purge the site to be brazed/soldered before and during the braz-
ing/soldering work with oxygen-free nitrogen.
Extracting the refrigerant
aD
Carry out the work in accordance with chapter "Extracting the re-
frigerant".
aF Testing pressure resistance
Carry out the work according to chapter "Testing pressure resist-
ance".
Filling the refrigerant circuit
aG
Carry out the work in accordance with chapter "Filling the refriger-
ant circuit".
Shutdown
aH
Carry out the work in accordance with chapter "Final decommis-
sioning and disposal".
Identification (labelling the heat pump)
aJ
If the heat pump has been taken out of use, affix a label to the
outdoor unit in a clearly visible position containing the following in-
formation with date and signature:
Outdoor unit works with flammable refrigerant R290 (propane).
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System has been taken out of use.
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Refrigerant has been extracted.
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Outdoor unit contains nitrogen.
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Outdoor unit may contain residual flammable refrigerant.
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140
(cont.)
Completed Comments