Panasonic U-72MF2U9 Service Manual page 75

4. Recovering Refrigerant
4. Recovering Refrigerant
Refrigerant
recovery unit
Refrigerant recovery cylinder
Refrigerant
recovery unit
Refrigerant recovery cylinder
4-3. Recovery of Refrigerant from Entire System
(1) Turn off power to the entire outdoor system.
(2) Short-circuit the AP pin (CN24) on the outdoor control PCB of all outdoor units, then supply power to the
outdoor units.
* By short-circuiting the AP pin (CN24) and supplying power to the outdoor units, the solenoid valve in each
unit is forcibly opened and all remaining refrigerant can be recovered.
(3) If any unit has encountered a power failure, follow the instructions in "4-1. Refrigerant Recovery Procedures
(from Outdoor Units)" and perform refrigerant recovery for the faulty outdoor unit.
(4) Connect the manifold gauge to the high- and low-pressure outlet ports (Schrader-type valves) on any outdoor
unit. (Figs. 5-a, 5-b)
CAUTION
(5) Connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder. Quickly connect
each part to prevent air from entering the tube.
(6) Check that each service valve of the suction tube, discharge tube, liquid tube, and the balance tube for the
outdoor unit has opened, then perform refrigerant recovery.
* If only a single outdoor unit is installed, the balance tube is not used. Therefore, leave this valve closed.
To determine the completion of refrigerant recovery, follow the instructions that came with the
NOTE
refrigerant recovery unit.
Type: 72, 96
Manifold
gauge
Lo Hi
Type: 120, 144
Manifold
gauge
Lo Hi
Remaining refrigerant may cause internal pressure.
Check that each valve on the manifold gauge valves is tightly closed.
The connection port uses a Schrader-type push-to-release valve.
2 - 11
2WAY VRF SYSTEM
3WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Outdoor Unit Repair Procedures
Low-pressure outlet port
(for ø5/16" (ø7.94mm)-dia connector)
High-pressure outlet port
(for ø5/16" (ø7.94mm)-dia connector)
Oil balance tube service port
(For ø5/16" (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16" (ø7.94mm)-dia connector)
Discharge tube service port
(for ø5/16" (ø7.94mm)-dia connector)
Suction tube service port
(for ø5/16" (ø7.94mm)-dia connector)
Low-pressure outlet port
(for ø5/16" (ø7.94mm)-dia connector)
High-pressure outlet port
(for ø5/16" (ø7.94mm)-dia connector)
Oil balance tube service port
(For ø5/16" (ø7.94mm)-dia connector)
Liquid tube service port
(for ø5/16" (ø7.94mm)-dia connector)
Suction tube service port
(for ø5/16" (ø7.94mm)-dia connector)
Discharge tube service port
(for ø5/16" (ø7.94mm)-dia connector)
1
Fig. 5-a
2
3
4
Fig. 5-b
5
6
7
8
9