Haier AU242FHBHA Installation Manual page 14

Installation Procedures
Refrigerant charge
After air purge, replace the vacuum pump with refrigerant pump to charge refrigerant.
Calculation of refrigerant charge amount
Refrigerant precharged at factory does not include the amount necessary for field using.
The amount necessary for charging piping is according to the calculation result.
Additional charge amount is according to the piping diameter and length in job site to calculate.
Refrigerant charge amount at filed = Actual length of liquid piping X Additional charge amount per 1m in liquid piping.
The formula for Convertible Type and Cassette Type and Cabinet Type Indoor unit :
For example: Additional charge amount R(kg)=(L1x0.030kg/m)+(L2x0.065kg/m)+...
L1 6.35 Actual length of liquid piping;
L2 9.52 Actual length of liquid piping;
Diameter of liquid piping
6.35
9.52
12.7
The formula for Wall mounted Type and Ceiling concealed Type Indoor unit :
For example: Additional charge amount R(kg)
=(L1x0.030kg/m)+(L2x0.065kg/m)+(L3x0.120kg/m)+(L4x0.016kg/m)+(L5x0.035kg/m)
L1 6.35 Actual length of liquid piping(From outdoor unit to Electronic Expansion Valve Assembly);
L2 9.52 Actual length of liquid piping(From outdoor unit to Electronic Expansion Valve Assembly);
L3 12.7 Actual length of liquid piping(From outdoor unit to Electronic Expansion Valve Assembly);
L4 6.35 Actual length of liquid piping(From electronic Expansion Valve Assembly to indoor unit);
L5 9.52 Actual length of liquid piping(From electronic Expansion Valve Assembly to indoor unit);
Additional refrigerant charge
Input refrigerant through service port of gas and liquid side.
In case of failing to fill up prescribed weight of refrigerant, open all of gas and liquid valves, then close the gas valve a
bit. Turn on the compressor and input refrigerant from the service port of the gas side. Use gas cylinder to regulate the
flow of refrigerant to enable gasification when sucked by system.
In case of refrigerant leakage and refrigerant insufficiency, refrigerant can be recover from the system and fill up
prescribed weight of refrigerant again.
Valve opening
Open all the valves of outdoor unit.
Piping insulation
Insulate gas and liquid piping separately.
Heat resisting of insulation material of gas piping should be above 120
Additional charge amount of refrigerant per 1m
0.030kg
0.065kg
0.120kg
13
Connecting piping