Refrigerant Piping Design; Piping Scheme - Carrier 38VMA072RDS5-1 Engineering Data Book

REFRIGERANT PIPING DESIGN

NOTE: For calculation purposes, assume equivalent pipe length of the branching pipe header to be 1.6 ft. (0.5m).

Piping Scheme

Total Extension of Pipe (Liquid Pipe)
Farthest Piping Length
Piping Length
Distance Between Outdoor Unit & Main MDC
Height Between Outdoor & Indoor Unit
Piping Height
Difference
* If no indoor unit size, 72K or 96K, are connected to MDC port, and if Height between MDC and Indoor Unit is < 49 ft, distance
between MDC and Indoor Unit can be extended up to 197 ft according to Fig. 51.
** The maximum piping height difference allowable for indoor unit capacity 72K or more is 32 ft.
*** The maximum piping height difference allowable for indoor unit capacity 72K or more is 64 ft.
Fig. 49 —Piping Lengths and Drop Heights
Table 56 — Permitted Pipe Lengths and Drop Heights
DESCRIPTION
Distance Between MDC & Indoor Unit
Height Between MDC & Indoor Unit
Height Between Indoor Units
Height Between MDCs
ALLOWABLE VALUE (ft)
Actual Length
Equivalent Length
Actual Length
Actual Length
Outdoor Unit Above
Outdoor Unit Below
52
≤ 3280 A+B+C+D+E+a+b+c+d+e+f+m
≤ 623
A+C+E+f
≤ 541
≤ 360
≤ 131* B+d, C+D+e, C+E+f, m
≤ 164
≤ 131
≤ 49**
≤ 98***
≤ 49
PIPES
A
H
H1
h1
h2
h3