Fisher FHIF-WHS-120CE3, Руководство по обслуживанию

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R32 ATW Service Manual
39
Note: Oil return elbow radius R≤100mm, 10 oil return elbows must be located per 5m as shown above; when the
height difference between indoor and outdoor unit exceeds five meters, oil reserve elbow and backstop elbow
should be set according to the relative position of outdoor unit and indoor unit.
11.3.4 Main pipe diameter
Model
Main pipe diameter
Pipeline length (one-way)<30m
Pipeline length (one-way)
≥
30m
Liquid pipe Gas pipe Liquid pipe Gas pipe
φ
9.52
φ
15.88
φ
9.52
φ
15.88
φ
9.52
φ
15.88
φ
9.52
φ
19.05
11.3.5 Remove the foreign matter inside the pipe
 When the refrigerant piping is installed, foreign matter inside the pipe must be removed with high
pressure nitrogen.
 The hydronic module shall not be connected during cleaning.
 It is not possible to replace nitrogen with flammable and toxic gases such as refrigerant or oxygen.
11.3.6 Air tightness test
1) After the refrigerant piping is installed and connected to the hydronic module, the nitrogen with
pressure of 40kgf/cm2 (4.00 MPa) should be injected from the gas side and the liquid side, before
connecting the pipe to the outdoor unit valve. Mark the pressure value and perform 8-hour air tightness
test.
2) If a pressure drop is found, re-examine the leakage of all interfaces and re-pressurize for 8 hours
FHOF
-WHS-100CE3
FHOF
-WHS-160CE3-3F