Lennox FLATAIR FIC-H, Инструкция по установке, эксплуатации и обслуживанию

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2.- INSTALLATION
2.7.- REFRIGERANT CONNECTIONS
Split units are supplied with gas and liquid lines sealed with copper covers, and located 60mm from casing.
Split units are supplied with nitrogen gas, this must be removed and then proceed as folow:
Cupper cover
Brazing
Gas
Terminal
block
Liquid
Service ports
During installation operations, keep gas and liquid pipes covered, in order to prevent humidity and dirt,
get into them.
Take special concern about refrigerant pipes are isolated.
Avoid collapse on line installation.
. Remove the nitrogen gas through the high and low 5/6” service ports located inside and provide a low vacuum for safety.
2. Remove the caps from the connecting lines.
3. Braze the piping connection lines. Select piping diameter from table 2.7..
(When brazing refrigerant pipes, nitrogen gas must be supplied into the pipes through the service ports to remove the air).
4. Leak test:
Add nitrogen gas, check that a pressure of 5 kg/cm
2
has been reached and that there are no leaks in the circuit or brazing
by applying soapy water to the pipes which will cause the bubbles to form where there are leaks.
To detect small leaks, proceed as follows:
Add nitrogen gas and check that a pressure of 25 kg/cm
2
has been reached, there are no leaks if the pressure remains the same
for at least 24 hours and the final pressure is not less than 10% below the initial pressure.
5. Ensure that the gas line is insulated.
6. Evacuation:
Remove the nitrogen gas, connect the gauge manifold and vacuum pump to both the liquid and gas lines, fully open the gauge
manifold valve and switch on the vacuum pump. Check to make sure the gauge shows a pressure of -750mm Hg. Once a level
of -750mm Hg is reached, keep the vacuum pump running for at least one hour.
7. Refrigerant charge:
- Check TABLE 3.. and 3.2. for the amount of refrigerant charge, depending on the length and size of the pipe connections.
- Disconnect the vacuum pump and connect to the refrigerant-charging bottle. Open the charging pump and purge the air from
the hose at the pressure gauge manifold.
- Set up the amount of additional refrigerant on the weighing scale, open the high pressure and charged in the liquid state. If the
total amount of refrigerant charge has not been reached because the pressure is balanced, turn off the high side of the gauge
manifold, turn on the unit, and add the remaining amount of the refrigerant charge required slowly through the low side of the
pressure gauge. (With R-40A refrigerant, the charging bottle must be in a vertical position and charged in the liquid state).
Close the pressure gauge, disconnect it from the from the service port of the unit and fit caps on the service ports. The unit is
then ready to operate.