Daikin VRV IV RXYQ TYDN Series Engineering Data page 54

EDUS341411-N
4.1.2 Equivalent Piping Length of Joints and Headers (Reference)
Pipe Size *
L Joints
REFNET Joint
REFNET Header
* When the equivalent piping length in cooling operation is calculated, the gas pipe size is selected.
When the equivalent piping length in heating operation is calculated, the liquid pipe size is selected.
Installation of Outdoor Units
 1/4 in.  3/8 in.  1/2 in.  5/8 in.
( 6.4 mm) ( 9.5 mm) ( 12.7 mm) ( 15.9 mm)
6-1/4 in. 7-1/8 in. 7-7/8 in. 9-7/8 in.
(0.16 m) (0.18 m) (0.20 m) (0.25 m)
 3/4 in.  7/8 in.  1 in.  1-1/8 in.
( 19.1 mm) ( 22.2 mm) ( 25.4 mm) ( 28.6 mm)
13-3/4 in. 15-3/4 in. 17-3/4 in. 19-5/8 in.
(0.35 m) (0.40 m) (0.45 m) (0.50 m)
1.6 ft (0.5 m)
3.3 ft (1.0 m)
REFNET Pipe System
 1-1/4 in.  1-3/8 in.  1-1/2 in.  1-5/8 in.
( 31.8 mm) ( 34.9 mm) ( 38.1 mm) ( 41.3 mm)
21-5/8 in. 23-5/8 in. 25-5/8 in. 29-1/2 in.
(0.55 m) (0.60 m) (0.65 m) (0.75 m)
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