4
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and service of the unit. See Fig. 3 for the required minimum distances between the unit, walls or ceilings.
Piping
IMPORTANT: Both refrigerant lines must be insulated separately.
S Table 3 contains piping information for the product covered within this document.
Table 3—Piping And Refrigerant Information
38MAR SIZE
9K
(115V)
12K
(115V)
9K
(208/230V)
12
(208/230V)
18K
(208/230V)
24K
(208/230V)
30K
(208/230V)
36K
(208/230V)
Piping
Min. Piping
Length
Ft (m) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3) 10 (3)
Standard
Piping Length
Ft (m) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5) 25 (7.5)
Max. Outdoor
indoor height
difference
Ft (m) 32 (10) 32 (10) 32 (10) 32 (10) 65 (20) 65 (20) 82 (25) 82 (25)
Max. Piping
Length with
no additional
refrigerant
charge
Ft (m) 26 (8) 26 (8) 26 (8) 26 (8) 26 (8) 26 (8) 26 (8) 26 (8)
Max. Piping
Length
Ft (m) 82 (25) 82 (25) 82 (25) 82 (25) 98 (30) 98 (30) 164 (50) 164 (50)
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) 0.32 (30) 0.32 (30) 0.32 (30)
Gas Pipe
in 3/8 1/2 3/8 1/2 1/2 5/8 5/8 5/8
(mm) 9.52 12.7 9.52 12.7 12.7 16 16 16
Liquid Pipe
in 1/4 1/4 1/4 1/4 1/4 3/8 3/8 3/8
(mm) 6.35 6.35 6.35 6.35 6.35 9.52 9.52 9.52
Refrigerant
Refrigerant
Type
- R410A R410A R410A R410A R410A R410A R410A R410A
Heat Pump
Models
Charge
Amount
Lbs
(kg)
2.76 (125) 2.76 (125) 3.31 (1.5) 3.31 (1.5) 4.30 (1.95) 5.73 (2.60) 6.06 (2.75) 7.50 (3.40)
All outdoor units have an electronic expansion valve to manage the refrigerant flow of the fan coil connected.
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