Mitsubishi Electric CITY MULTI PQHY-P72-Z KMU-A Manuel D'installation page 8

9
unit 1
3.
h1 h2
h1 = 0.2 m (7-7/8 in) max
The NG example shows that oil accumulates into unit 1 while unit 3 is in operation, and unit 1 is stopped. Vertical pipe height (h) should be 0.2 m (7-7/8 in) or below.
unit 1
4.
h2 = 0.1 m (3-15/16 in) max
h1 = 0.2 m (7-7/8 in) max
The NG example shows that oil accumulates into unit 3 while unit 1 is in operation, and unit 3 is stopped. Vertical pipe height (h) should be 0.2 m (7-7/8 in) or below.
<B> Slope of twinning pipes (for PQHY-P·ZSKMU-A)
Make sure the slope of the twinning pipes are at an angle within ±15° to the horizontal plane.
If the slope exceeds the angle specified, the unit may be damaged.
E
<C> Example of piping connection (for PQRY-P·ZSKMU-A)
F
H
G
J
8
unit 2 unit 3
h2 = 0.1 m (3-15/16 in) max
unit 2
unit 3
h2
h1
D
I
9.
unit 2
unit 1
h1 h2
h2 > 0.1 m (3-15/16 in)
h1 > 0.2 m (7-7/8 in)
unit 1 unit 2
h2 > 0.1 m (3-15/16 in)
h1 > 0.2 m (7-7/8 in)
A : Slope downward
B : Slope upward
C : BC controller (standard or main)
D : Twinning pipe
E : Slope of the twinning pipe is at an angle within ±15° to the ground
F : Twinning pipe (low-pressure side)
G : Twinning pipe (high-pressure side)
H : Field-supplied piping (low-pressure connecting pipe: between heat source
units)
I : Field-supplied piping (low-pressure main pipe: to BC controller)
J : Field-supplied piping (high-pressure main pipe: to BC controller)
unit 3
unit 3
h2 h1