Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial COMMISSIONING OPERATION
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The main board AP7 of the ODU consists of six function buttons:
Function Button Name and Meaning
Button
Code
Function Meaning
SW1
FUNCTION
Indicates the function button, used for function settings.
SW2
+
Indicates the upward selection button.
SW3
-
Indicates the downward selection button.
SW4
ENTER
Indicates the confirmation button.
SW5
BACK
Indicates the return button, used to return to the upper-level menu.
SW6
Reserved function and meaningless currently.
3.2.2 Introduction to functions
Function
Code
Function Name
Function Meaning
Remark
Ft
Test run mode
Used for running before factory, enable ODU controller
and parts to work fluently.
Control (CU)
function can be set
as ON or OFF
according to actual
situation.
A8
Aftersales vacuuming
mode
Automatically enables all electronic expansion valves and
electromagnetic valves during maintenance to guarantee
vacuum processing in all pipelines.
A2
Refrigerant recovery
operation
Fully or partially recovers refrigerants in a faulty module
or IDU pipeline according to the system pressure after
automatic startup during maintenance.
A3
Forcible defrosting
operation
Forcibly enables ODU defrosting operation.
n5
Indoor unit project number
offset
Prevents IDU project number conflicts when different
refrigerating systems are controlled in a centralized
manner.
A6
Unit cooling/heating
function
Sets the unit to cooling/heating, single-cooling,
single-heating, or air supply mode for centralized
management.
Control (CU)
function
The factory setting
is cooling/heating.
NH
Suction temperature
Displays the value of suction temperature.
Display (DI)
function is to
display the value of
ODU parameter.
NP
Discharge temperature
Displays the value of discharge temperature.
NW
Environment temperature
Displays the value of environment temperature.
PL
Low pressure
Displays the value of low pressure.
PM
Middle pressure
Displays the value of middle pressure.
PH
High pressure
Displays the value of high pressure.
N1
Online ODU quantity
Displays the number of online ODUs.
N9
Online IDU quantity
Displays the number of online IDUs.
If above function settings are incorrect, unit will run abnormal and compressor may even be damaged.
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