Introduction; Audience; Using This Guide; How To Determine Equivalent Length - Daikin R-22 Refrigerant Piping Design Manual

Introduction

Audience

This Application Guide was created for design engineers and
service technicians to demonstrate how to size refrigerant
piping.

Using This Guide

This Guide covers R-22, R-407C, R-410A, and R-134a used
in commercial air conditioning systems. It does not apply to
industrial refrigeration and/or Variable RefrigerantVolume
(VRV) systems. Illustrations and figures are not to scale.
Examples showing how to perform an analysis appear under
shaded headlines as seen below.

How to Determine Equivalent Length

Calculate the equivalent length of the liquid line for the
following condensing unit with DX air-handling unit.
The liquid line is composed of the following elements:
• 30 ft (9.14 m) of 1-3/8 inch (35 mm) piping
• 4 long radius elbows
• 1 filter-drier
• 1 sight glass
• 1 globe type isolating valve
To determine the equivalent length for the refrigerant
accessories use Table 5 and
Item Quantity
Long radius elbow 4
Filter-drier 1
Sight glass 1
Globe valve 1
Piping 1
Total
www.DaikinApplied.com
Table 6 on page 41.
Dimension, ft (m) Total, ft (m)
2.3 (0.7 m) 9.2 (2.8 m)
35 (10.7 m) 35 (10.7 m)
2.5 (0.76 m) 2.5 (0.76 m)
38 (11.6 m) 38 (11.6 m)
30 (9.1 m) 30 (9.1 m)
117.7 (34.96 m)
3 AG 31-011 • REFRIGERANT PIPING DESIGN