Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 17
3 Getting Started
3.1 Checks
3.1.1 Outdoor Unit
• Unit is secured to a stable surface
• Unit is raised in regions of regular snowfall
• Distances to potential obstacles or hazards are
maintained
• A condensate drain line is connected
3.1.2 Hydraulic Unit
• Unit is secured to a stable surface
• There is enough space for maintenance around the
unit
• There is free access to the unit
• There are no leaks
3.1.3 Hydraulic System
• Check the conformity of connections
• The use of flexible connections is recommended
• The system must be flushed
• Check the expansion vessel pre-charging (1 bar)
• Check the system's pressure and purge
• Check that the pump(s) is/are not locked
3.1.4 Electrical System
• Check the conformity of connections (per NFC
15100)
• Check that the lines are protected (two C curve
circuit breakers for "heat pump" and "auxiliaries",
lines must be separate)
• Differential protection is required (up to 300 mA).
• Check that connections are properly tightened
(flexible wire tips)
• Check the main power supply voltage and make
sure the polarity is correct
• Find out what type of contract has been subscribed
with the power company (load shedding)
3.1.5 Refrigeration System
• Make sure connections are compliant (diameters,
minimum and maximum lengths)
• Flare fittings must be properly made
• Use only HFC-specific tools and materials (POE oil,
etc.)
• For welding, use silver welding (40% min.) under
nitrogen flux
• Comply with the refrigerant handling legislation
• Conduct a nitrogen pressure leak test (~ 25 bar)
• Pump-down is required (preferably using a
vacuometer)
• Open both valves on the outdoor unit (first the liquid
valve then the gas valve)
• Supplement if necessary (according to the tables in
the instructions)
• Check fittings for tightness
• Check that pipes are correctly insulated and
fastened
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