LG MULTI V 5 Manual Book page 107

4.2 High Static Pressure Compensation
This function secures the air flow rate of ODU, in case the static pressure has been applied like using duct
at fan discharge of ODU.
When the static pressure is added to the air flow rate of ODU, the air flow rate is reduced. This function
compensates the reduced air flow rate by increasing the RPM of fan according to the static pressure.
■ Setting the function
Function
High Static Pressure
Compensation
■ Option Selection
Setting
RPM
Standard (Default) 880
op1 910
op2 930
op3 950
Setting
RPM
Standard (Default) 1000
op1 1040
op2 1070
op3 1100
※ Based on connecting duct
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_TROUBLE SHOOTING GUIDE BOOK
Option
Fn 2 oFF, op1~op7
UXA (8~12HP)
Pa CMM at 0Pa CMM at 80Pa
0~20 240 175
21~40 255 190
41~60 265 200
61~80 270 205
UXB (14~26HP)
Pa CMM at 0Pa CMM at 80Pa
0~20 320 190
21~40 335 230
41~60 350 260
61~80 360 280
■ Detailed information
• This function is used with heat pump and heat recovery.
• All modes of operation involving compressor operation are a change in the setting impact.
• The operating symptoms that might be corrected using this function During normal operation in cooling
mode, the system head pressure is consistently high relative to target pressure. In heating mode dur-
ing normal operation, the system suction pressure is too low relative to the target pressure.
• If the air flow rate of ODU is decrease according to the static pressure, the efficiency of the system
decreases. generally, when the air flow is less than 80% of the rated air flow, the cycle changes
abnormally. (ex. high pressure over-pressure, low pressure over-pressure)
• Each option increases the max RPM to ensure air flow rate at least 80% of the rated air flow rate,
depending on the static pressure.
· Ask an authorized technician to setting a function.
· If the indoor unit combination is more than 100%, a higher level option setting should be consid-
ered.
· The air flow increases when the option is set at a higher level than the static pressure. This causes
increase in noise and power consumption.
· It is recommended to check the correct static pressure when setting the option step.
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