Johnson Controls YVAHP036B21S, Engineering Manual

Page: 53 / 94

OUTDOOR UNITS
TC-16001-rev.5
2-35
2.14.1 Piping Work Conditions
2.14 Piping Work
Outdoor Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
First Branch
Indoor Unit Side
L3
H2
H1
L1 L2
L3 L3 L3
: Gas Pipe, Liquid Pipe
Terminal
Indoor Unit
Comply with the following limitations when installing the unit.
[ Example ]
Item Mark Allowable Piping Length
Total Piping Length - < 984 ft (300m)
Maximum Piping Length
Actual Length
L1
< 492 ft (150m)
Equivalent Length < 623 ft (190m)
Maximum Piping Length between
Multi-kit of 1st Branch and Each Indoor Unit
L2 < 131 ft (40m)
Maximum Piping Length between
Each Multi-kit and Each Indoor Unit
L3
< 131 ft (40m)
Height Difference between
Outdoor Unit and Indoor Units
Outdoor Unit is Higher
H1
< 164 ft (50m)
Outdoor Unit is Lower < 131 ft (40m)
Height Difference between Indoor Units H2 < 49 ft (15m)
Number of Main Branch
Including Header Branch - 1 or less
Not Including Header Branch - 2 or less
Item Mark Details
Total Piping Length a+b+c The total amount of all piping actual length.
Maximum Piping
Length
a+c
The actual piping length between the stop
valve of the outdoor unit and the terminal
indoor unit.
Piping Length -
The actual length of pipe takes no account
for equivalent lengths for pressure drops of
elbows.
Equivalent Piping
Length
-
The combination of the straight pipe length
plus the equivalent length of elbows and other
pressure drop calculations.
a
b
c
A B
Indoor
Unit
Indoor
Unit
First Branch
Multi-Kit
Outdoor Unit
[ Example ]