Pumping Out Refrigerant From Outdoot Unit - Panasonic U-120ME2U9 Service Manual

8. Pumping Out Refrigerant from Outdoor Unit
8-1. If Remote Controller is Used for Maintenance of Outdoor Unit
(1) See "3. Backup Operation" and perform backup operation.
(2) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit to be
repaired. Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid tube
service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter. (Fig. 14)
* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup
operation by recovering the refrigerant from the outdoor unit to be repaired.
(Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures,
such as installing a high-pressure cutout in the circuit.)
CAUTION
1
(3) Connect the outdoor unit maintenance remote controller to the RC connector (3P) (BLU) (CN73) on the outdoor
unit control PCB of the outdoor unit to be repaired. Then start a test run of all units.
(Press and hold the
2
Low-pressure outlet port
(for ø5/16" (ø7.94m)-
dia connector)
3
Manifold
gauge
Lo Hi
4
5
6
Connect from here to
refrigerant recovery unit
7
8
9
The hoses may be subject to internal pressure from the refrigerant inside the outdoor
unit. Check that the manifold gauge valves are fully closed beforehand.
A Schrader-type push-to-release valve is provided at each connection port.
(CHECK) button for 4 seconds or longer.)
Faulty outdoor unit
Outdoor Unit Repair Procedures
Other outdoor unit
High-pressure outlet port
(for ø5/16" (ø7.94mm)-
dia connector)
Liquid tube service port
(for ø5/16" (ø7.94mm)-
dia connector)
2 - 22
2WAY VRF SYSTEM
Refrigerant
recovery
cylinder
Measuring scale
To indoor unit
Fig. 14