H-Link - Hitachi PC-ARF Technical Catalogue

6 Building air conditioning controls
CSNET WEB (PSC-A160WEB1)

6.1.2.6 H-LINK


H-LINK II Compatible
PSC-A160WEB1 has compatibility with the new version of H-LINK communication called H-LINK 2 while maintaining full
compatibility with current H-LINK (H-LINK 1) units.
Connection of both H-LINK 1 and H-LINK 2 units in the same H-LINK unit is possible considering the unit limitations and
addressing.
H-LINK 2 communication system adds new addressing for up to 64 Refrigerant Address and up to 64 Indoor Unit Address
per each Refrigerant Address.
Also H-LINK 2 adds increased number of devices up to a maximum of 200 devices in the H-LINK 2 line. It is considered as
a device a CSNET WEB, an Indoor Unit, an Outdoor Unit or other devices with H-LINK address.
PC-A1IO, KPI or DX-Kit count as a normal indoor unit.
The maximum number of Indoor units is 160, and for the outdoor units are 64.
When there is a central control device like PSC-A160WEB1, the maximum number of total units (indoor and outdoor units)
for only 1000 meters of H-LINK line is shown on the following table:
H-LINK line length could be up to 1000 meters, they could be increased to 5000 meters using up to 4 PSC-5HR. Each of
them adds 1000 meters to the line, affecting the quantity of indoor unit that can be connected to the same H-LINK.
Each H-LINK line repeater (PSC-5HR) counts as 16 indoor units. The following table summarize the affection of the PSC-
5HR to the indoor and outdoor unit maximum number.
Number of PSC-5HR
0
1
2
3
4
Therefore, considering the previous maximums and the number of PSC-5HR, the maximum number of indoor units with
one central control, on that case CSNET WEB, is shown on the following table and graphic.
160
140
120
100
80
60
40
20
0
Outdoor units
0 PSC-5HR 64
1 PSC-5HR 64
2 PSC-5HR 64
3 PSC-5HR 64
4 PSC-5HR 64
415 415
TCGB0106 rev.0 - 12/2014
Outdoor units
Indoor units
Units (outdoor and indoor)
H-LINK devices
Maximum length of H-LINK
1000 meters
2000 meters
3000 meters
4000 meters
5000 meters
Maximum Indoor Unit Quantity
Maximum indoor units quantity
1 4 8 12 16 20 24 28
160 160 160 160 156 152 148
156 152 148 144 140 136 132
140 136 132 128 124 120 116
124 120 116 112 108 104 100
108 104 100 96 92 88 84
Maximum number
64
160
176
200
Maximum number of indoor and outdoor units
32 36 40 44 48 52 56 60
144 140 136 132 128 124 120 116
128 124 120 116 112 108 104 100
112 108 104 100 96 92 88 84
96 92 88 84 80 76 72 68
80 76 72 68 64 60 56 52
176
160
144
128
112
0 PSC-5HR
1 PSC-5HR
2 PSC-5HR
3 PSC-5HR
4 PSC-5HR
64
112
96
80
64
48
6