Panasonic U-72MF1U9, Technical Data Manual

Page: 18 / 118

Design of 3WAY VRF SYSTEM
2 - 4
8
7
6
5
4
3
2
1
1. Model Selecting and Capacity Calculator
Item Mark Contents Length (ft.)
L1
Actual length 492
574
L (L2 – L4)
131
LM 262
1
1
2 ,
2
...
...
98
L1+ + +
984
A + B+LF+LG+LH
L5
L3
H1
164
131
H2
H3
L = Length, H = Height
32
49
13
*2
6.6
40
40
1:
2:
3:
Table 2-1 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Allowable tubing
length
Allowable elevation
difference
Allowable length of
joint tubing
Equivalent length
Max. tubing length
Difference between max. length and min.
length from the No. 1 distribution joint
Max. length of main tubing (at max. diameter)
Max. length of each distribution tube
Distance between outdoor units
When outdoor unit is installed higher than indoor unit
When outdoor unit is installed lower than indoor unit
Max. difference between indoor units
Max. difference between outdoor units
T-joint tubing (field-supply); Max. tubing length between
the first T-joint and solidly welded-shut end point
NOTE
The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that
are connected to the tube ends.
If the longest tubing length (L1) exceeds 295 ft. (equivalent length), increase the sizes of the main tubes (LM)
by 1 rank for the discharge tubes, suction tubes, and narrow tubes. (field supplied)
If the longest main tube length (LM) exceeds 164 feet, increase the main tube size at the portion before 164 ft.
by 1 rank for the suction tubes and discharge tubes. (field supplied)
(For the portion that exceeds 164 feet, set based on the main tube sizes (LA) listed in the table on the following page.)
Total max. tubing length including length of
each distribution tube (only liquid tubing)
<
<
<
<
<
<
<
<
<
<
1-3. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown
in the figure below.
1.
2.
Main distribution tubes LC – LH are selected according to the capacity after the
distribution joint.
3.
4.
The outdoor connection main tubing (LO portion) is determined by the total capacity of the
outdoor units that are connected to the tube ends.
Sizes of indoor unit connection tubing 1 – 40 are determined by the connection
tubing sizes on the indoor units.
Main tubing length LM = LA + LB … < 262 ft _
Be sure to use special R410A distribution joints (CZ: purchased separately) for outdoor
unit connections and tubing branches.
Note: Do not use commercially available T-joints for the liquid tubing and parts.
*
<
<
Solidly welded shut
(pinch weld)
Balance tubing
L5
LO
LF
LM
LB LC
L2
L4
LG
LD LE L3
LH Solenoid valve kit
T-joint tubing
(header joint system)
H2
H3
H1
L1
2
3
1
5 4
A B
C
6 7
40
R410A distribution joint
CZ-P900PH1U (for outdoor unit)
CZ-P224BH1U (for indoor unit)
CZ-P680BH1U (for indoor unit)
CZ-P1350BH1U (for indoor unit)
(ø3/8")
Explanation of symbols
Distribution joint
(purchased separately)
Ball valve (field supply)
T-joint (field supply)
For
extension
For
extension
Max.1.3 ft
Max.1.3 ft
LA
TD831158-00̲3WAY̲VRF̲SYS.indb 4 TD831158-00̲3WAY̲VRF̲SYS.indb 4 2012/01/23 17:30:11 2012/01/23 17:30:11