40MBAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
REFRIGERANT LINES
General refrigerant line sizing
1. The outdoor units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft. (7.6 m). For runs
over 25 ft. (7.6 m), consult the product data.
2. Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
3. Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in. (914 mm) should be buried. Provide a
minimum 6 in. (152 mm) vertical rise to the service valves to prevent refrigerant migration.
4. Both lines must be insulated. Use a minimum of ½ in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long-line applications.
5. Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not
transmitted into the structure.
6. For piping runs greater than 25 ft. (7.6 m), add refrigerant up to the allowable length as specified in the product data.
Refrigerant Coil Specifications
Table 5 — Refrigerant Coil Specifications
UNIT SIZE
18
24
30/36/48
60
D
UCTED
INDOOR
COIL
Number of rows
3
4
5
Tube pitch (a)x row pitch (b)
in
0.83x0.53
mm
21x13.37
Fin Spacing
FPI
20
mm
1.3
1.3
1.3
1.3
Fin type
Louvered
Fin Material
Gold hydrophilic aluminum
Tube outside dia.
inch
0.276
mm
7
Nominal Tube Wall
mm (inch)
0.00945 (0.24)
Tube Enhancement
(Yes/ No)
Yes
Tube Material
Copper
Coil length x height x width
inch
16.34x13.23x1.58x2
16.34x21.5x2.11x2
16.34x21.5x2.63x2
mm
415x336x40.11x2
415*546*53.48*2
415*546*66.85*2
Face area
ft
2
3
4.88
4.88
Number of circuits
6
10
14
Metering Device
inch
No metering device in indoor unit - information provided in Outdoor Unit’s PSR
High Burst Pressure
Psi (MPa)
550(3.79)
Low Burst Pressure
Psi (MPa)
340(2.34)
Design (high/low) Burst Pressure
Psi
550/340
Gas Pipe (size – connection type)
In (mm)
Ø1/2” (12.7)
ø5/8” (15.9)
ø5/8” (15.9)
Ø7/8” (22)
Liquid Pipe (size – connection type)
In (mm)
Ø1/4” (6.35)
ø3/8” (9.52)
ø3/8” (9.52)
ø3/8” (9.52)