Mitsubishi Electric Y Series Manual page 96

VKM/YKM-Series
96
Precautions for system design
• The capacity and number of indoor units when using a branch box differs from situations when no branch box is
used. Refer to the installation manual for each outdoor unit for more information. Moreover, the indoor unit lineup
varies from country to country, so contact your local distributor for details.
• Capacity calculations for the entire system will depend on the connected indoor unit. Refer to the installation
manual for more information.
• Piping lengths also differ when using a branch box. Refer to the installation manual for each outdoor unit for more
information.
Comparison of Piping Lengths for PUMY-Series Models
P112/125/140 Refrigerant Piping Length
Vertical Differentials
Between Units
Refrigerant Piping Length
Vertical Differentials
Between Units
P200 Refrigerant Piping Length
Vertical Differentials
Between Units
Refrigerant Piping Length
Vertical Differentials
Between Units
SP80/112/125/145 Refrigerant Piping Length
Vertical Differentials
Between Units
Refrigerant Piping Length
Vertical Differentials
Between Units
*1 Include system with connection kit
*2 Farthest branch box from first branch.
*3 In case of including PKFY or PFFY, height between units is 30m.
*4 In case of branch box connection : 12m
*5 Liquid pipe diameter: 12.7 mm, in case of further piping length is longer than 60 m, or the farthest length of main pipe between outdoor unit and branch box is longer than 20 m in branch box system.
*6 Use liquid pipe of ø9.52 for less than P50 indoor units, when farthest length from the first joint exceeds 30m.
Only City Multi
Indoor Unit
Total Length
Maximum Allowable Length 150 (175 equivalent)
Farthest Indoor From First Branch
Indoor/Outdoor(Outdoor higher)
Indoor/Outdoor(Outdoor lower)
Indoor/Indoor
Total branch pipe length
Farthest branch pipe length
Total main pipe length
Farthest main pipe length
Branch box/Indoor
Branch box/Branch box
Total Length
Maximum Allowable Length 80 (90 equivalent)
Farthest Indoor
From First Branch
Indoor/Outdoor(Outdoor higher)
Indoor/Outdoor(Outdoor Lower)
Indoor/Indoor
Total branch pipe length
Farthest branch pipe length
Total main pipe length
Farthest main pipe length
Branch box/Indoor
Branch box/Branch box
Total Length
Maximum Allowable Length 70 (90 equivalent)
Farthest Indoor
From First Branch
Indoor/Outdoor(Outdoor higher)
Indoor/Outdoor(Outdoor Lower)
Indoor/Indoor
Total branch pipe length
Farthest branch pipe length
Total main pipe length
Farthest main pipe length
Branch box/Indoor
Branch box/Branch box
Maximum Meter
*1 Only Branch Box
Connection
City Multi
300 (with 1 branch box)
300 150
240 (with 2 branch boxes)
80
30 30 *2
50 50
40 40
15 15 *4
- 95
- 25
- 55
- 55
- 15
- 15
150 150
80 80 (90 equivalent)
*5 *5
*2
30 30
50 50
40 40
15 15 *4
― 95
― 25
― 55
― 55 *5
― 15
― 15
120 120
80 70 (90 equivalent)
50 *6 50 *2
50 50
30 30
15 15 *4
― 95
― 25
― 55
― 55
― 15
― 15
Mixed System
(City Multi *1 Indoor Unit + Branch Box)
*1 Indoor Unit Via Branch Box
150
85 80
30 30 *2
50
40
15 *4
- 95
- 25
- 55
- 55
- 15
- 15
150
80
*5 *5
*2
30 30
50
40
15 *4
― 95
― 25
― 55
― 55 *5
― 15
― 15
120
80
50 *6 50 *2 *6
50
30
15 *4
― 95
― 25
― 55
― 55
― 15
― 15