Before Troubleshooting (W Multi Series; W Multi Series System Overview - Panasonic 2WAY Multi Technical & Service Manual

2. Before troubleshooting (W MULTI series)

(1) W MULTI series system overview

W MULTI series is a system that can join up to two outdoor units to the same refrigerant tube, and control each
outdoor unit while performing air conditioning according to the operation load of the indoor unit.
Figure 1 gives an overview of the system.
In the example, the W MULTI series (refrigerant system 1) connecting to two outdoor units and 3WAY MULTI
(refrigerant system 2) are linkwired by using an operation cable for the indoor - outdoor units.
(This is an example of a dual system consisting of two refrigerant systems.)
Indoor unit
1-1
Refrigerant
tubing
Refrigerant tubing (Outdoor branch tubing)*1
W MULTI
outdoor unit
1
*1 Refrigerant tube
Figure 1 is a simplifi ed diagram. Actually, two refrigerant tubes consisting of a gas tube (thick tube) and a liquid
tube (thin tube) are used. Each W Multi outdoor unit is connected to an outdoor branch tube, and then connected
to the main tube. For the indoor unit, the refrigerant tubes branched from the main tube are connected to the gas
tube and liquid tube of each indoor unit.
Refrigerant System 1
Indoor/outdoor control wire
Indoor unit
1-2
(Indoor branch
tubing)
W MULTI
outdoor unit
2
Indoor/outdoor control wire
Fig. 1 GHP System Configuration Example
Refrigerant System 2
Indoor/outdoor control wire
Indoor unit
Indoor unit
1-48
2-1
3WAY MULTI
outdoor unit
1
II–1
Indoor unit
2-2
Refrigerant tubing
(Indoor branch tubing)