2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
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2. Discharging Compressor Oil
2-1. Discharging Oil from Oil Separator
Sampling of discharged oil can be used for checking the condition of the system. Based on the appearance and
color of the discharged oil, a judgment can be made on whether the system is operating normally or not.
Type: 72, 96
Type: 120, 144
Recover the refrigerant from the outdoor unit following the procedure given in “4. Recovering Refrigerant”.
Install hoses as indicated on the equipment and feed nitrogen gas gradually to provide pressure to the system from
the low-pressure outlet and collect oil in a pan or container. (Figs. 2-a, 2-b, 2-c and 2-d)
U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9
In the case of 1 outdoor unit in a system
Open the balance tube using the flathead screwdriver.
In the case of more than 2 outdoor units in a system
Close other outdoor unit balance valves.
Fig. 2-a
Fig. 2-b
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
2. Discharging Compressor Oil
High-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Low-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Gas tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Nitrogen ga
s
Manifold gauge
Lo
Hi
Oil balance tube service port
(For ø5/16” (ø7.94mm)-dia connector)
Packless valve
or the like
Container
Nitrogen gas
Manifold gauge
Lo
Hi
Packless valve
or the like
Container
High-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Low-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Gas tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Oil balance tube service port
(For ø5/16” (ø7.94mm)-dia connector)
A faulty outdoor unit may remain pressurized. The oil outlet port employs a Schrader-type
push-to-release valve. Be careful to avoid accidental oil release when using the port.
CAUTION
The low-pressure outlet port is nearly at the center area in the unit. For the model
U-72ME2U94/U-96ME2U94, the low-pressure outlet port is located at the rear of the box
containing the trans.
Type: 72, 96
Type: 120, 144
U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94
Fig. 2-c
Fig. 2-d
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
2. Discharging Compressor Oil
High-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Low-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Gas tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Nitrogen gas
Manifold gauge
Lo
Hi
Oil balance tube service port
(For ø5/16” (ø7.94mm)-dia connector)
Packless valve
or the like
Container
Nitrogen gas
Manifold gauge
Lo
Hi
Packless valve
or the like
Container
High-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Low-pressure outlet port
(for ø5/16” (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Gas tube service port
(for ø5/16” (ø7.94mm)-dia connector)
Oil balance tube service port
(For ø5/16” (ø7.94mm)-dia connector)
SM830237-07_北米向け2WAY_VRF.indb 4
18/06/18 18:48:09