Product data

19
PIPING REQUIREMENTS
SYSTEM SIZE 18K 27K 36K 48K
Piping
Min. Piping Length per each indoor unit ft (m) 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)
Max. outdoor---indoor height difference
(OU higher than IU)
ft (m) 32(10) 32(10) 32(10) 32(10)
Max. outdoor---indoor height difference
(IU higher than OU)
ft (m) 49(15) 49(15) 49(15) 49(15)
Max. height different between indoor units ft (m) 32(10) 32(10) 32(10) 32(10)
Max. Length per each indoor unit ft (m) 66(20) 82(25) 98(30) 98(30)
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)
Total Maximum Piping Length per system Ft. (m) 98(30) 147(45) 196(60) 245(75)
Addition al refrigerant charge
(between Standard – Max piping length)
Oz/ft (g/m) 0.16(15) 0.16( 15) 0.16(15) 0.16(15)
Gas Pipe Size in (mm) 3/8*2 (9.52*2) 3/8*2 ( 9.52*3)
1/2 *1 (12.7*1)
+3/8*3(9.5*3)
1/2 *2 (12.7*2)
+3/8*3(9.5*3)
Refrigerant
Liquid Pipe Size in (mm) 1/4 *2 (6.35*2) 1/4 *3 (6.35*3) 1/4 *4 (6.35*4) 1/4 *5 (6.35*5)
Refrigerant Type R410A R410A R410A R410A
Charge Amount Lbs (kg) 4.19 ( 1.9) 6.17 (2.8) 7.94 (3.6) 10.14 (4.6)
NOTE: The refrigerant char ge included is adequate for the number of zones multiplied by the maximum piping length per zone with no
additional refrigerant.
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 maximu m 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.