Haier AB072XCBAA, Service Manual, Page: 111 / 181

Special Installation Guide to 21000BTU indoor units on Free Multi system
Only for outdoor unit AU422XIBAA working with 21000BTU indoor units
1. Special accessory pipes for 21000BTU indoor units:
A B
Changing pipe (1/2-5/8) Collecting pipe (1/4-3/8)
φ 12.7 φ 15.88
φ 6.35
φ 9.52
φ
6.35
2. Pipe installations:
A1
A2
B1
B2
Gas pipe
φ
15.88
Liquid pipe φ 9.52
Liquid pipe φ 9.52
Gas pipe
φ
15.88
21000BTU indoor unit
21000BTU indoor unit
3. Outdoor wiring diagram should be changed as the following:
Coil of solenoid vavle A2
should be changed to
connected with CN29.
Coil of solenoid vavle B2
should be changed to
connected with CN23.
By-pass vavle on both
system A and system B
should be pulled out and
not connected.
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