Gree GMV-224WM/B-X, Service Manual

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
177
Note: All wired controls are set to master wired controls by default.
(4) If the AP1 of the master IDU is replaced,
Reset the master IDU through the wired control; otherwise, the LCD displays L7 (no master IDU). There
are two methods to set the IDU:
①
In shut mode, press and hold the
―MODE‖
button for 5 seconds and set the IDU corresponding to this
wired control to a master IDU. After setting, the ―Main‖ icon is highlighted.
② Set the wired control parameter ―P10‖ to 1.
3.2. Cautions on Wired Control XK49 Replacement
To replace the wired control XK49, in addition to the preceding handling steps specific for XK46, you
should also configure access control.
(1) If the wired control does not need an access control system, set switch ―1‖ for DIP S1 at the
bottom of
the wired control to digital end (neglect switch ―2‖).
(2) If the wired control needs an access control system, set switch ―1‖ for DIP S1 at the bottom of the
wired control to ON (neglect switch ―2‖) and connect the access control card interface
to ports N and L or
ports VCC and GND of the wiring terminal. The following should be noted:
①
Ports N and L are power interfaces of 100-240V~50/60Hz access control.
②
Ports VCC and GND are power interfaces of DC 5-24V access control.
③
Either of them can be selected at one time.
II. Compressor Replacement and Cautions
1. Determining Compressor Fault
1.1 Precondition: Units can be normally started.
Step 1:
If units can be normally started, start the units so as to measure line current of the faulty compressor.
Use a pressure gauge to measure pressure of various valves and connect the gauge to a PC for viewing
test data. Verify the current data in the figures below against the current recommended. For inverter
compressors, current will be deviated 10% while rate of turn and operating condition vary.
①
For inverter compressors E655DHD-65D2YG and E705DHD-72D2YG:
The figure below shows current curves that change with evaporating temperature and condensing
temperature while the compressors work at 30 Hz.
C
om
pr
es
so
r
C
ur
re
nt
(
A
)
Evaporating
Temp. (°C)
C
on
de
ns
in
g
T
em
p.
(
°C
)
The figure below shows current curves that change with evaporating temperature and condensing
temperature while the compressors work at 60 Hz.
C
om
pr
es
so
r
C
ur
re
nt
(
A
)
Evaporating
Temp. (°C)
C
on
de
ns
in
g
T
em
p.
(
°C
)
The figure below shows current curves that change with evaporating temperature and condensing
temperature while the compressors work at 90 Hz.