Panasonic U-20ME1E81, Service Manual

Page: 69 / 177

3 - 3
2WAY SYSTEM
Outdoor Unit Repair Procedures
3
2. Discharging Compressor Oil
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. ”
-System with 1 outdoor unit
Open the balance tube valve using the flathead screw driver.
-System with 2 or more outdoor units
Close the balance tube valve of other outdoor unit.
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. (Fig. 2)
• The low-pressure outlet port is at the Hi: side of the left side.
•
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
High-pressure outlet port
(for ø7.94mm-dia connector)
Low-pressure outlet port
(for ø7.94mm-dia connector)
Liquid tube service port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-dia connector)
Type 8HP / 10HP
Nitrogen gas
Manifold gauge
Lo Hi
Packless valve or the like
Container
Oil balance tube service port
(For 7.94mm-dia. connector)
Fig. 2-a
SM830204-05_2WAY SYS_new.indb 3 15/01/05 15:31:27