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1-13. How to select AHU system
System lineup
AHU system selection guideline
*Mix connection with standard indoor units is not allowed.
* The system is applicable to the above models.
* Single connection type only
System Overview
Piping design regulation
Connecting pipe dimension to heat exchanger of AHU
Capacity
U-200PE1E8 CZ-280PAH1
U-250PE1E8 CZ-280PAH1
20 kW
25 kW
Outdoor combination Connectable AHU-kit combination
Capacity Model name Liquid pipe Gas pipe
A
AHU kit controller box (with control PCB)
B
AHU equipment (Field supplied)
C
AHU kit controller (Option parts)
D
Outdoor unit
E
Gas piping (Field supplied)
F
Liquid piping (Field supplied)
G
Thermistor for Liquid pipe (E1)
H Thermistor for Heat exchanger pipe middle (E2)
I
Thermistor for Suction air (TA)
J
Inter-unit wiring
K
Magnetic relay for operating the blower (Field supplied)
Strainer (Liquid pipe &
Gas pipe) Min. ø25.4,
#100 (Field supply)
System piping length (Charging with refrigerant)
At the time of shipment from the factory, the outdoor unit is charged with enough refrigerant for an equivalent
pipe length of 30m.
If the equivalent piping length used is 30m or less, no additional charge will be necessary.
If the equivalent piping length is between 30 and 70m, charge with additional refrigerant according to the
equivalent length given in the following table.
20kW ø9.52mmCZ-280PAH1 ø25.4mm
25kW ø12.7mmCZ-280PAH1 ø25.4mm
Capacity Additional charge amount Equivalent length Minimum length
20kW 70m40g/m 5m
25kW 70m80g/m 5m
Sec1.indd 78 2014/11/07 10:28:11
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