Mitsubishi Electric CITY MULTI PQHY-P-ZLMU Installation Manual page 26

[Fig. 9.2.3] (P.8)
<A>
<B>
A
Indoor unit
C
E
G
[Fig. 9.2.4] (P.8 - 9)
<A> Install the piping so that oil will not accumulate in the stopped heat source
unit.
on a reverse gradient while unit 1 is in operation, and unit 2 is stopped.
<B>
horizontal plane.
<C>
A
Slope downward
C
E
F
H
I
J
Caution:
failure.
start-up failure.
Do not install a sight glass because it may show improper refrigerant
If a sight glass is installed, inexperienced technicians that use the
glass may overcharge the refrigerant.
10. Additional refrigerant charge
26
B
D
Twinning pipe
F
Twinning kit
B
Slope upward
D
Twinning pipe
G
10.1. Calculation of additional refrigerant
charge
charge and then charge the system accordingly.