Spec sheet

15
PIPING REQUIREMENTS
SYSTEM SIZE 18K 24K 30K 36K 48K
Piping
Min. Piping Length per each indoor unit ft (m) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3)
Standard Piping Length per each indoor
unit
ft (m) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5)
Max. outdoor-indoor height difference
(OU higher than IU)
ft (m) 49 (15) 49 (15) 49 (15) 65 (20) 65 (20)
Max. outdoor-indoor height difference
(IU higher than OU)
ft (m) 49 (15) 49 (15) 49 (15) 65 (20) 65 (20)
Max. height different between indoor units ft (m) 32 (10) 32 (10) 32 (10) 32 (10) 32 (10)
Max. Length per each indoor unit ft (m) 82 (25) 98 (30) 115 (35) 115 (35) 115 (35)
Max. Piping Length with no additional
refrigerant charge per System
(Standard Piping length x No. of Zones)
ft (m) 49 (15) 74 (22.5) 98 (30) 123 (37.5) 123 (37.5)
Total Maximum Piping Length per system ft (m) 131 (40) 197 (60) 263 (80) 328 (100) 328 (100)
Additional refrigerant charge
(between Standard – Max piping length)
Oz/ft
(g/m)
0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15) 0.16 (15)
Suction Pipe Size
in
(mm)
3/8*2
(9.5*2)
3/8*3
(9.5*3)
1/2*1+3/8*3
(12.7*1+9.5*3)
1/2 *2+3/8*2
(12.7*2+9.5*2)
1/2 *2+3/8*3
(12.7*2+9.5*3)
Liquid Pipe Size
in
(mm)
1/4 *2
(6.3*2)
1/4 *3
(6.3*3)
1/4 *4
(6.3*4)
1/4 *4
(6.3*4)
1/4 *5
(6.3*5)
Refrigerant
Refrigerant Type R410A R410A R410A R410A R410A
Charge Amount Lbs (kg) 4.41 (2.0) 6.17 (2.8) 6.61 (3.0) 10.14 (4.6) 10.14 (4.6)
NOTE: The refrigerant charge included is adequate for the outdoor unit’s maximum number of zones multiplied by the standard
piping length per zone.
APPLICATION DATA
Unit Selection
When selecting a variable speed system match the system capacity
range to the anticipated load range. Since a variable speed system
can accommodate a wide range of loads it is important to
understand the percentage of time that the system will be required
to run at both the maximum and the minimum load points. This
differential is most evident when a residential application is
compared with a commercial application.
Generally there will be more load diversification in the residential
application (shifting from low load to high load). The commercial
application tends to be more steady during the normal day time
hours, and will go to low load levels after normal business hours. If
it is anticipated that the system needs to run at the maximum load
point for the majority of the time, the next larger system capacity
should be selected.
The Application Data table on the following page is a guideline for
selecting the proper size for the application.