Daikin EWYT021CZI-A1, Руководство по установке и обслуживанию

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UNIT Gas Piping Liquid Piping
Unit Connection
Gas Side
Unit Connection
Liquid Side
EWYT021CZ(O/I)-A1 Ø 28,6 mm Ø 9,52 mm Ø 28,6 mm F Ø 12,7 mm F
EWYT032CZ(O/I)-A1 Ø 28,6 mm Ø 12,7 mm Ø 28,6 mm F Ø 12,7 mm F
EWYT040CZ(O/I)-A1 Ø 28,6 mm Ø 12,7 mm Ø 28,6 mm F Ø 12,7 mm F
EWYT064CZ(O/I)-A2 Ø 28,6 mm
Ø 12,7 mm on Circuit 1,
Ø 9,52 mm on Circuit 2
Ø 28,6 mm F Ø 12,7 mm F
After all the piping has been connected, make sure that there isn
’t any gas leak. Use nitrogen to perform
a gas leak detection test.
Be sure that the field installed piping does not touch other pipes, the bottom panel or side panel.
Especially for the bottom and side connection, be sure to protect the piping with suitable insulation, to
prevent it from coming into contact with the casing.
Use a 2-stage vacuum pump with a non-
return valve that can evacuate to a gauge pressure of −
⁠
100.7 kPa
(−
⁠
1.007 bar) (5 Torr absolute). Make sure the pump oil does not flow in opposite sens into the system
while the pump is not working.
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks, ventilate the area
immediately. Possible risks:
▪
Excessive refrigerant concentrations in a closed room can lead to oxygen deficiency.
▪
Toxic gas may be produced if refrigerant gas comes into contact with fire.
NEVER directly touch any accidental leaking refrigerant. This could result in severe wounds caused by
frostbite.
6.4. To connect the refrigerant piping to the indoor unit
Before any connecting operation begins, make sure to remove the plastic brackets on the piping ends,
otherwise the heat from the brazing process may cause damage to them.
The connecting procedure for the indoor unit requires the gas pipe to be brazed first. While performing
the brazing process for the liquid pipe (thus the last one, considering that the outdoor unit has already
been connected) it is fundamental to braze without the use of the nitrogen. This is because the nitrogen
gas would not have any outlet once the piping has been connected, and it would cause the pressurising
of the pipe. DO NOT use nitrogen while brazing the liquid pipe (i.e., the last pipe to be brazed).
The connection process can be performed with the following procedure:
1. Remove the panel
2. Remove the plastic brackets (1), otherwise the heat generated from the welding process could damage them.
3. Remove the caps on the piping ends (2) and let the nitrogen flow out of the unit.
4. Braze the piping ends with the procedure shown above to the piping system.
5. Once the piping has cooled down, reinstall the plastic brackets.
6. Reinstall the panel.
DISCHARGE LINE
LIQUID LINE