Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 113
7 Annual Maintenance Services
7.1 Hydraulic Circuit
• clean filter (if any)
• inspect heating system (system pressure,
purging, leak test)
• inspect expansion vessel (preload with nitrogen
at 1 bar)
• fix any leaks
7.2 Outdoor unit
• clean heat exchanger
• clean refrigeration and ventilation compartment
• check for correct condensation drain
• conduct refrigeration circuit leak test (required if
charged > 2 kg)
7.3 Electrical
• Inspect connections and tighten where
appropriate
• Check condition of wires and boards
7.4 Operating checks
• conduct refrigeration readings at temperatures
• in case of malfunction, install pressure gauges
for refrigeration diagnosis
• check voltage, current and control
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