Manual Inventor U5MRT32 (page 26 of 144) (English, German)

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 Page 26 

Note On Adding Refrigerant

CAUTION

• Refrigerant charging must be performed after wiring, vacuuming and the leak test.

• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system.

Doing so can damage or impact the unit’s function.

• Charging with unsuitable substances may cause explosions or accidents. Ensure that the

appropriate refrigerant is used.

• Refrigerant containers must be opened slowly. Always use protective gear when charging the

system.

• For the R290 or R32 refrigerant model, make sure the condtions within the area have been

made safe by control of flammable material when the refrigerant added into air conditioner.

• The maximum refrigerant charge amount of R32 is 305 grams.

• DO NOT mix refrigerants types.

Some systems require additional charging depending on pipe lengths. The standard pipe length

varies according to local regulations. For example, in North America, the standard pipe length is

7.5m (25’) In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be

charged can be calculated using the following formula:

Liquid Side Diameter

R32 : (Total pipe length -

standard pipe length)x

12g(0.13oZ)/m(ft)

(Total pipe length -

standard pipe length)x

24g(0.26oZ)/m(ft)

(Total pipe length -

standard pipe length)x

40g(0.42oZ)/m(ft)

φ6.35(1/4”) φ9.52(3/8”) φ12.7(1/2”)

R22

(orice tube in the indoor unit):

(Total pipe length -

standard pipe length)x

30g (0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)x

65g(0.69oZ)/m(ft)

(Total pipe length -

standard pipe length)x

115g(1.23oZ)/m(ft)

R22

(orice tube in the outdoor unit):

(Total pipe length -

standard pipe length)

x15g(0.16oZ)/m(ft)

(Total pipe length -

standard pipe length)

x30(0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)

x60g(0.64oZ)/m(ft)

(Total pipe length -

standard pipe length)

x65g(0.69oZ)/m(ft)

R410A:

(orice tube in the indoor unit):

(Total pipe length -

standard pipe length)

x30g(0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)

x65g(0.69oZ)/m(ft)

(Total pipe length -

standard pipe length)

x115g(1.23oZ)/m(ft)

R410A:

(orice tube in the outdoor unit):

(Total pipe length -

standard pipe length)

x15g(0.16oZ)/m(ft)

(Total pipe length -

standard pipe length)

x30g(0.32oZ)/m(ft)

 Page 27 

CAUTION

DO NOT place the panel facedown on the floor,

against a wall, or on uneven surfaces.

Step 1: Remove the front grille.

1. Push both of the tabs towards the middle

simultaneously to unlock the hook on the

grille.

2. Hold the grille at a 45° angle, lift it up

slightly and detach it from the main body.

Fig. 10.1

Step 2: Remove the installation covers at the

four corners by sliding them outwards.

Fig. 10.2

Step 3: Install the panel

Align the front panel to the main body, taking

into account the position of the piping and

drain sides. Hang the four latches of the

decorative panel to the hooks of the indoor

unit. Tighten the panel hook screws evenly at

the four corners. (See Fig 10.3)

NOTE: Tighten the screws until the thickness of

the sponge between the main body and the

panel reduces to 4-6mm (0.2-0.3”). The edge

of the panel should be in contact with the

ceiling well.

Adjust the panel by turning it to the arrowed

direction shown in Fig 10.3 so that the ceiling

opening is completely covered.

Piping side

Drain side

Latch

Screwdriver

Connect the two louver motor connectors

to the corresponding wires in the control

box.

Connect the

louver motor

Control box

Connect the

louver motor

Fig. 10.4

Fig. 10.3

Panel Installation 10

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