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37

• The four-way valve error detection control starts when:

- During cooling operation, when indoor heat exchanger temperature exceeds 45°C in 5 minutes after compressor starts.
- During heating operation, when indoor heat exchanger temperature is below 5°C in 5 minutes after compressor starts.

• During four-way valve error, compressor is shut down and indoor unit is set to thermo-off status.
• After 3 occasions, four-way valve error is displayed; all operation stopped except outdoor fan remaining heat removal control.

• This control is to protect the compressor.
• Valve error is detected if comply with condition below:

- Power is on for the first time and within 5 minutes from compressor starts (However, the unit is considered power on for first

time when compressor starts operating continuously for 7 minutes). 

- Indoor heat exchanger temperature at compressor start -3°C < current heat exchanger temperature for 1 minutes.

• During this error, four-way valve error is displayed; compressor is shutdown.

• High-pressure switch disconnection is detected when high-pressure switch input continuously open for 1 minutes while the com-

pressor shutdown.

• During this error, high-pressure switch error is displayed.

• Low-pressure switch disconnection is detected when low-pressure switch input continuously open for 1 minutes while compres-

sor shutdown.

• During this error, low-pressure switch error is displayed.

• Test run is necessary after installation is completed.
• To enable forced cooling test run, at outdoor PCB, set the DS1 to ON position and DS2 to OFF position.

• To enable forced heating test run, at outdoor PCB, set the DS1 to ON position and DS2 to ON position. 

• Press Test Run button at outdoor pcb for 1 second.

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• CORRECTION OF CAPACITIES

1. Correction of capacities according to the connecting pipe length.

The data of rated capacities (marked on the name plate) are based on 7.5 meters connecting pipe and horizontal installation.

2. For other pipe length of other installation multiply by the following correction factor to determine the revised cooling capacity. 

Note :
Piping elevation B = outdoor unit installed at top
Piping elevation C = outdoor unit installed at bottom

Model No.

Piping size

Piping 
length      

(A)

Piping     

elevation 

(B)

Piping     

elevation 

(C)

Piping 

Chargeless 

Add        

Refrigerant

Liquid / 

High

Valve

Gas / 

Low

Valve

Max(m)

Max(m)

Max(m)

Max(m)

(g/m)

Cassette

R410A CS-F14DB4E5

6.35

3-ways

12.70

3-ways

30

30

20

20

20

type

CS-F18DB4E5

39

1. Piping installation by standard piping

• At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 20 m.

(Refer the following table)
But when the piping length exceeds 20m, additional charge is required according to the following table.
Example:
CU-B24DBE5
In case of 30m long pipe (one way), the amount of refrigerant to be replenished is: (30 - 20) x 20 = 200g

Model Name

Standard piping specification

Liquid piping 

(dia.mm)

Gas piping 

(dia.mm)

Gas chargeless 

length (m)

Additional gas    

volume (g/m)

CU-B14DBE5

6.35

12.70

20

20

CU-B18DBE5

6.35

12.70

20

20

MODEL NAME

OUTSIDE DIMENSIONS

NET WEIGHT

CENTRE OF GRAVITY

WIDTH (mm)

DEPTH (mm)

HEIGHT (mm)

kg

X (mm)

Y (mm)

Z (mm)

CU-B14DBE5

900

320

795

69

560

150

320

CU-B18DBE5

900

320

795

69

560

150

320

40

• Precautions shown here are differentiated between 

 Warnings and 

 Cautions. Those that have much chances for leading to

significant result such as fatality or serious injury if wrong installation would have been carried out are listed compiling them

especially into the column of 

 Warnings.

However, even in the case of items which are listed in the column of 

 Cautions, such items also have a chance for leading to

significant result depending on the situations.
In either case, important descriptions regarding the safety are listed, then observe them without fail.

• As to indications with illustration

• After installation work has been completed, do not only make sure that the unit is free from any abnormal condition through the

execution of try run but also explain how to use and how to perform maintenance of this unit to the customer according to the
instruction manual.
In addition, request the customer to keep this manual for installation work together with instruction manual.

Carry out installation work with reliability after thorough reading of this “Precautions in terms of safety”.

This mark means “Caution” or “Warning”.

This mark means “Earth”.

The appliance must be installed by technician, who takes into
account the requirements given by ISO5149 or eventual equivalent
requirements.

If installing inside a small room, measures should be taken to pre-
vent refrigerant levels from building up to critical concentrations in
the event of a refrigerant leak occurring. Please discuss with the
place of purchase for advice on what measures may be necessary
to prevent critical concentrations being exceeded. If the refrigerant
leaks and reaches critical concentration levels, there is the danger
that death from suffocation may result.

As to installation, request the distributor or vendor to perform it.
Imperfection in installation caused by that having been carried out
by the customer himself may lead to water leakage, electric shock,
fire, etc. 

Securely attach the protective covers for the outdoor unit connec-
tion cables and power cord so that they do not lift up after installa-
tion. If the covers are not properly attached and installed, the
terminal connections may overheat, and fire or electric shock may
result.

Carry out the installation work with reliability according to this
manual for installation work.
Imperfection in installation leads to water leakage, electric shock,
fire, etc.

Switch off all supplies before accessing any electrical part.

Carry out the installation work with reliability on the place that can
bear the weight of this unit sufficiently. Insufficient strength leads to
injury due to falling of the unit.

If refrigerant gas escapes during installation, ventilate the affected
area. If the refrigerant gas comes into contact with sparks or naked
flames, it will cause toxic gases to be generated.

Carry out predetermined installation work in preparation for strong
wind such as typhoon, earthquake. Imperfection in installation
work may lead to accidents arisen from overturn, etc.

Once installation work is completed, check that there are no refrig-
erant gas in the room that can come into contact with sparks or
flames from a fan heater, stove or kitchen range, which will cause
toxic gases to be generated.