37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Table 17 — Additional Refrigerant Per Pipe Length
NOTE:
• Example: 18K unit with 3 indoor highwalls:
– N = 3. Standard length = 25 feet.
– Total pipe length (measure length of all 3 liquid lines) = 84 feet.
– 84 - 75 = 9 x 0.16 = 1.44 oz extra refrigerant
• Refer to Table 12 for maximum refrigerant pipe lengths.
• The standard pipe length for each indoor unit is 24.6ft/7.5m.
• N=3 18K, N=4 24K, N=5 30K & 36K,
• N=6 48K & 55K.
• Additional 17.6 oz (0.5 kg) refrigerant shall be added when AHU units are used in system.
CONNECTIVE PIPE LENGTH (M)
AIR PURGING
METHOD
ADDITIONAL REFRIGERANT
Less than standard pipe length * N
Vacuum Pump
N/A
Greater than standard pipe length * N
Liquid Side: Ø 1/4 in (Ø 6.35) R-454B
(Total pipe length - standard length * N) x0.16oz / ft (15g / m)
Add .16 Oz (4.5 g) of additional refrigerant for every foot (meter) of system piping over the standard length, per unit size as shown below
18K 24K 30K 36K 48K 55K
73.8 ft (22.5 m) 98.4 ft (30.0 m) 123 ft (37.5 m) 123 ft (37.5 m) 147.6 ft (45.0 m) 147.6 ft (45.0 m)
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