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_TROUBLE SHOOTING GUIDE BOOK __
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 Option
High Static Pressure
Compensation
Fn 2 oFF, op1~op7
■ Option Selection
Setting
UXA (8~12HP)
RPM Pa CMM at 0Pa CMM at 80Pa
Standard (Default) 880 0~20 240 175
op1 910 21~40 255 190
op2 930 41~60 265 200
op3 950 61~80 270 205
Setting
UXB (14~26HP)
RPM Pa CMM at 0Pa CMM at 80Pa
Standard (Default) 1000 0~20 320 190
op1 1040 21~40 335 230
op2 1070 41~60 350 260
op3 1100 61~80 360 280
※ Based on connecting duct
4.2 High Static Pressure Compensation
■ 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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