Gree CN851W1000, Service Manual

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DC Inverter Multi
VRF Service Manual
45
CONTROL
18 (set temp.) Set temp. value is displayed when the selected indoor unit is on and not in timer inquiry or setting status.
19 HR (hour) “HR” is displayed during timer inquiry or setting.
20 .5 “.5” is displayed when the timer time value includes 0.5 hr and the unit is during timer inquiry or setting.
Note:
① . Contents in the double quotation marks indicate the display in LCD. Following part is the same to it.
② .
Online indoor units to Mini Centralized Controller indicate that in a region. Following part is the same to it.
③ . No signal control function for region wired controller, and “SINGLE” won’t be displayed either.
4�4 Connection Between Controller and Unit
Insert the 4-core twisted pair line to wired controller, if which is with the indoor unit, into region controller wiring
terminal CN1 (or CN2), and then connect the other wiring terminal CN2 (or CN1) with the main board of indoor unit.
If there is no wired controller with indoor unit, introduce a 4-core twisted pair line to indoor unit main board and
connect it with region controller wiring terminal CN1 (or CN2).
Note:
Any main board of the indoor unit controlled by the region controller can be connected. If the region controller is
used as a region wired controller, wired controller with the indoor unit must be removed.
Region Controller
CN1
CN2
Optional connection
4-core twisted pair line
4-core twisted pair line
1
1
1
1
Main board of Indoor unit
4-core communication line terminal.
Wired controller or region controller
4-core communication line terminal.
Fig.5.4 Power cords and communication lines for region controller
Before installation and connection, make sure the power supply is off. After installation and connection, check the
connection result again to prevent loose or short.
There are 4 connection lines (included in the 4-core twisted pair line) to the controller, from CN1 or the upper and
right CN2 to the upper they respectively are: Ground line (GND), communication line A (A), communication line B(B) and
power cord (+12 v).
Note:
During following connection of wirings, pay special attention to them to avoid malfunction to units for
electromagnetic interference.
④ . Keep the signal lines or wirings (communication) of region controller or wired controller at least 20 cm from the
power cords or connecting lines between indoors and outdoors to prevent abnormal communication.
⑤ . Shielding twisted pair line must be adopted as signal line or wiring (communication) once the unit is installed in
the place where there is serious electromagnetic interference.