Compressor Replacement And Cautions - Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
(3) If there are two wired controls controlling one or multiple IDUs, perform the steps below first:
Set the wired control parameter ―P13‖ to change the address of one control to 01 (master) and that
of the other control to 02 (slave); otherwise, a CP (multiple master wired controls) fault alarm will be
reported (as shown in the figure below).
After setting, the LCD displays the
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.
1.2.2 Cautions on wired control XK79 replacement
To replace the wired control XK79, 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.

2 COMPRESSOR REPLACEMENT AND CAUTIONS

2.1 Determining Compressor Fault
2.1.1 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.
icon, as shown in the figure below.
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