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Protection against ice
In areas where the temperature can reach 0 °C or less, there should be some kind of additional protection
to prevent the water contained in the condensate drain pipe from freezing.
An electric heater (wire heater) should be installed in the drain trap and in the condensate drain pipe.
For units with heat pumps, electric heaters must also be installed in the outdoor coil tray to prevent
possible ice accumulation.
1.10.5 Unit interconnection
The installation of the unit includes:
•
Unit assembly.
•
Refrigerant piping connection.
•
Electrical installation of the unit.
In the installation of Split units, the cooling circuit must be completely airtight once assembly is complete
to ensure there are no leaks. This provides the maximum performance with the minimum consumption,
avoids serious faults in the unit and minimises its effects on the ecosystem.
Cooling layout
The refrigerant pipes must be connected to the units using pipe flaring.
1. Indoor coil
2. Check valve
3. Expansion valve
4. Service valve
5. Suction accumulator
6. Liquid sight glass
7. Expansion valve
8. Check valve
9. Liquid probe
10. Outdoor air probe
11. Outdoor coil
12. 4-way reversing valve.
13. Discharge probe
14. Compressor
15. Suction probe
16. Dehydrator filter
Unit refrigerant connection
The indoor and outdoor units are connected by refrigerant pipes that form a sealed refrigerant circuit.
The maximum acceptable distances with the standard circuit and tube diameter are those indicated in
the graphs and tables of
the pipe outlet diameter of the units).
•
In the case of horizontal sections measuring over 20 metres in length, the suction line should slant
2% downwards towards the compressor.
•
The maximum permitted speed on any section is 15 m/sec.
•
With the limitations indicated and where the pipe outlet diameters on the unit are not changed, drain
traps are not necessary.
•
The liquid must have at least 1 °C subcooling at the expansion valve inlet to avoid the formation of
gas in ascending liquid lines before entering the expansion system.
•
For connection lines measuring over 25 metres in length, oil must be added (30 g/m of line).
Instructions for installation and connection of the unit 1.10
Refrigerant charge and piping
Installation manual
1
12
13
HP
14
3
LP
15
2
4
diameter, see on page 35 (without changing
1
11
10
9
5
8
7
6
16
31
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