Discharging Compressor Oil - Panasonic U-120ME2U9 Service Manual

Hide thumbs Also See for U-120ME2U9:

Table of Contents

2. Discharging Compressor Oil

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.

2-1. Discharging Oil from Oil Separator

Recover the refrigerant from the outdoor unit following the procedure given in "4. Recovering Refrigerant".

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.

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)

CAUTION

U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9

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.

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.

Type: 72, 96

Manifold gauge

Packless valve

or the like

Container

Type: 120, 144

Manifold gauge

Packless valve

or the like

Container

Outdoor Unit Repair Procedures

2 - 4

2WAY VRF SYSTEM

Low-pressure outlet port