LG MULTI V 5 Manual Book page 111

4.7 Airflow Adjusting for IDU
It is the function to cope with the overload by changing air flow in the room to the low air flow when the
compressor Hz is the maximum but the high pressure is low.
■ Setting the function
Function
Airflow Adjusting for IDU
■ Option Selection
Setting
on Low capacity mode (discharge temperature up)
oFF
■ Detailed information
• Use when it is known the outdoor unit is operating at full capacity during the heating season and
the indoor unit air temperature in all zones is low, or feels drafty in nearly all the conditioned
spaces served by the system.
• This function is used with heat pump and heat recovery.
• Heating modes is a change in the setting impact.
• The operating symptoms that might be corrected using this function
This function should only be used on a temporary basis. It is typically used when the outdoor unit
is undersized. Symptoms occur most often when the design combination ratio (i.e. [nominal cooling
capacity of all IDUs] / [nominal cooling capacity of the outdoor unit]x100) is greater than 130%.
Symptoms include one or more of the following:
1) One or more IDU fans will not start because the temperature of the indoor unit coil does not
reach 85℉ (i.e. perpetual "hot start" mode)
2) Indoor unit fans run, but the leaving are temperature is low.
· Ask an authorized technician to setting a function.
· Always verify the refrigerant charge is correct before considering the use of this function. This
function is not a fix for a poorly designed piping system or a system that is not properly operating.
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_TROUBLE SHOOTING GUIDE BOOK
Option
Fn 7 on, oFF
Detail of function
Not setting
4.8 Target Pressure Adjusting
It is a function to change the target pressure of ODU according to field installation conditions (ex. pressure
loss according to piping length) and customer characteristics (ex, cooling or heating capability).
■ Setting the function
Function
Target Pressure Adjusting
■ Option Selection
Setting Cooling (Low Pressure, kPa)
op1 804
op2 725
op3 765
op4 869
op5 935
op6 1000
op7 1065
■ Detailed information
• This function is used with heat pump and heat recovery.
• Heating, Cooling and Dry modes is a change in the setting impact.
• The operating symptoms that might be corrected using this function
Low compressor operating speed on peak design days (or low compressor operating
hours) during the heating or cooling seasons or both (in the case of an oversized outdoor unit).
· Ask an authorized technician to setting a function.
· If do not use a function, set an off-mode.
· Option values of UXA / UXB Chassis are the same.
· A power consumption or capacity can be changed.
· This function can not be set with the remote control.
Option
Fn 8 oFF, op1~op6
Heating (High Pressure, kPa)
2990
3121
3056
2827
2663
2500
2337
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