Fn 12 Compressor Max. Frequency Limit; Auto Dust Removal Mode - LG MULTI V 5 Manual Book

4.11 Auto Dust Removal Mode

This function is able to improve the heat exchange efficiency to maintain clean state on heat exchanger of
ODU. Dust is removed on heat exchanger of outdoor unit by reverse rotation of fan.
■ Setting the function
Function
Auto Dust Removal Mode
■ Option Selection
Reverse cycle fan
Setting
runtime (min)
oFF -
op1 5
op2 5
op3 3
(following compressor shutdown)
op4 1
op5 1
■ Detailed information
• This function is used with heat pump and heat recovery.
• Cooling and Dry modes is a change in the setting impact.
• The operating symptoms that might be corrected using this function
When the outdoor unit is installed in arid climates, where moisture levels are very low, this option
can be selected to assist with keeping outdoor unit coil heat transfer optimized.
• The op3 selection requires the Multi V demand limit I/O PCB board be installed. If the demand limit
controller is installed in the master outdoor unit and a binary signal is sent to the outdoor unit via a
third party source, VRF system normal operation can be interrupted and an auto dust removal cycle
can be performed.
· Ask an authorized technician to setting a function.
· If do not use a function, set an off-mode.
· This option is not a substitute for coil cleaning and does not completely clear the coil of all debris.
A coil cleaning procedure should be included when performing regular preventative maintenance.
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Option
Fn 11 oFF, op1~op5
Time delay Number of
between cycles cycles
- -
2 hours No limit
2 hours 2
5 minutes
1
- 1
1 2
4.12 Compressor Max. Frequency Limit
It is a function to limit the maximum speed (frequency) of inverter compressor.
■ Setting the function
Function
Compressor Max. Frequency Limit
■ Option Selection
Setting Inverter (Hz)
oFF -
op1 143
op2 135
op3 128
op4 120
■ Detailed information
• This function is used with heat pump and heat recovery.
• All modes is a change in the setting impact.
• The operating symptoms that might be corrected using this function
Setting the maximum compressor speed can be a method to artificially downsize an outdoor unit
either temporarily until all indoor units are installed on a core and shell project or permanently on
projects where the outdoor unit installed has excess capacity on both heating and cooling design
days.
*Note : If interested in this option, please note there is no concern a selection will inhibit proper
defrost or oil return operation. The oil return requires algorithm operates the compressor at
speeds that are lower than the available minimum speed selectable.
· Ask an authorized technician to setting a function.
· If use a function, first install a central controller. (refer to the Installation manual)
· Do not depend on this option to lower the maximum current draw of the outdoor unit. The maximum
speed selected is ignored by the Multi V microprocessor during defrost.
Option
Fn 12 oFF, op1~op9
Setting Inverter (Hz)
op5 113
op6 105
op7 98
op8 90
op9 83
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