System Requirements; Piping Requirements - Carrier 38MGQ Series Installation Instructions Manual

SYSTEM REQUIREMENTS

Allow sufficient space for airflow and service of the unit. See Fig. 2 for the required minimum distances between the unit, walls or ceilings.

PIPING REQUIREMENTS

IMPORTANT: Both refrigerant lines must be insulated separately.
The minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m). The following lengths are allowed.
SYSTEM SIZE
Min. Piping Length per each indoor unit
Standard Piping Length per each indoor unit
Max. outdoor-indoor height difference
(OU higher than IU)
Max. outdoor-indoor height difference
(IU higher than OU)
Max. height different between indoor units
Max. Length per each indoor unit
Piping
Max. Piping Length with no additional
refrigerant charge per System
(Standard Piping length x No. of Zones)
Total Maximum Piping Length per system
Additional refrigerant charge
(between Standard – Max piping length)
Gas Pipe Size
Liquid Pipe Size
Refrigerant Refrigerant Type
Charge Amount
NOTE: The refrigerant charge included is adequate for the outdoor unit's maximum number of zones multiplied by the standard piping length per
zone.
Indoor High Wall 40MAQ
Indoor Cassette 40MB*C
Indoor Ducted 40MB*D
Indoor Floor Console 40MB*F
Table 2—Piping Lengths
ft (m)
ft (m)
ft (m)
ft (m)
ft (m)
ft (m)
ft (m)
Ft. (m)
Oz/ft (g/m)
in (mm) 3/8*2 (9.52*2)
in (mm) 1/4 *2 (6.35*2)
Lbs (kg)
Table 3—Indoor High Wall
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Table 4—Indoor Cassette
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Table 5—Indoor Ducted
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Table 6—Indoor Floor Console
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
18K 27K
10 (3) 10 (3)
25 (7.5) 25 (7.5)
32(10) 32(10)
49(15) 49(15)
32(10) 32(10)
66(20) 82(25)
49(15) 74(22.5)
98(30) 147(45)
0.16(15) 0.16(15)
3/8*2 (9.52*3)
1/4 *3 (6.35*3)
R410A R410A
4.19 (1.9) 6.17 (2.8)
9
in. 1/4"
in. 3/8"
9
in. 1/4"
in. 3/8"
9
in. 1/4"
in. 3/8"
9
in. 1/4"
in. 3/8"
4
36K 48K
10 (3) 10 (3)
25 (7.5) 25 (7.5)
32(10) 32(10)
49(15) 49(15)
32(10) 32(10)
98(30) 98(30)
98(30) 123(37.5)
196(60) 245(75)
0.16(15) 0.16(15)
1/2 *1 (12.7*1) 1/2 *2 (12.7*2)
+ 3/8*3 (9.5*3) + 3/8*3 (9.5*3)
1/4 *4 (6.35*4) 1/4 *5 (6.35*5)
R410A R410A
7.94 (3.6) 10.14 (4.6)
12 18
1/4" 1/4" 3/8"
1/2" 1/2" 5/8"
12 18
1/4" 1/4"
1/2" 1/2"
12 18
1/4" 1/4" 3/8"
1/2" 1/2" 5/8"
12
1/4"
1/2"
24
24