220 221
_TROUBLE SHOOTING GUIDE BOOK __
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 Option
Airflow Adjusting for IDU Fn 7 on, oFF
■ Option Selection
Setting Detail of function
on Low capacity mode (discharge temperature up)
oFF Not setting
■ 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.
4.7 Airflow Adjusting for IDU
· 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.
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 Option
Target Pressure Adjusting Fn 8 oFF, op1~op6
■ Option Selection
Setting Cooling (Low Pressure, kPa) Heating (High Pressure, kPa)
op1 804 2990
op2 725 3121
op3 765 3056
op4 869 2827
op5 935 2663
op6 1000 2500
op7 1065 2337
■ 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).
4.8 Target Pressure Adjusting
· 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.
Basic PartBasic PartBasic PartBasic Part
To Next Page
Loading...
