Manual Inventor U5MRT32 (page 21 of 144) (English, German)

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 Page 20 

Refrigerant Piping

6. Place flaring tool onto the form.

7. Turn the handle of the flaring tool

clockwise until the pipe is fully flared. Flare

the pipe in accordance with the dimensions

shown in table 7.3.

Table 7.3: PIPING EXTENSION BEYOND FLARE

FORM

Pipe

gauge

Tightening

torque

Flare dimension (A)

(Unit: mm/Inch)

Flare shape

Min. Max .

Ø 6.4

R0.4~0.8

45 °±2

90 °

±4

Fig. 7.9

Ø 9.5

Ø 12.7

Ø 15.9

Ø 19.1 65-67 N.m

(663-683 kgf.cm) 23.2/0.91 23.7/0.93

8. Remove the flaring tool and flare form,

then inspect the end of the pipe for cracks

and even flaring.

Step 4: Connect pipes

Connect the copper pipes to the indoor unit first,

then connect it to the outdoor unit. You should

first connect the low-pressure pipe, then the high-

pressure pipe.

1. When connecting the flare nuts, apply a

thin coat of refrigeration oil to the flared

ends of the pipes.

2. Align the center of the two pipes that you

will connect.

Indoor unit tubing Flare nut Pipe

Fig. 7.10

3. Tighten the flare nut as tightly as possible

by hand.

4. Using a spanner, grip the nut on the unit

tubing.

5. While firmly gripping the nut, use a torque

wrench to tighten the flare nut according

to the torque values in table 7.3.

NOTE: Use both a spanner and a torque wrench

when connecting or disconnecting pipes to/from

the unit.

Fig. 7.11

CAUTION

•

Ensure to wrap insulation around the piping.

Direct contact with the bare piping may result

in burns or frostbite.

•

Make sure the pipe is properly connected.

Over tightening may damage the bell mouth

and under tightening may lead to leakage.

NOTE ON MINIMUM BEND RADIUS

Carefully bend the tubing in the middle

according to the diagram below. DO NOT bend

the tubing more than 90° or more than 3 times.

Bend the pipe with thumb

min-radius 10cm (3.9”)

Fig. 7.12

6. After connecting the copper pipes to the

indoor unit, wrap the power cable, signal

cable and the piping together with

binding tape.

NOTE: DO NOT intertwine signal cable with

other wires. While bundling these items

together, do not intertwine or cross the signal

cable with any other wiring.

7. Thread this pipeline through the wall and

connect it to the outdoor unit.

8. Insulate all the piping, including the valves

of the outdoor unit.

9. Open the stop valves of the outdoor unit

to start the flow of the refrigerant between

the indoor and outdoor unit.

CAUTION

Check to make sure there is no refrigerant leak

after completing the installation work. If there is

a refrigerant leak, ventilate the area immediately

and evacuate the system (refer to the Air

Evacuation section of this manual).

Ø 22 75-85N.m

(765-867 kgf.cm) 26.4/1.04 26.9/1.06

18-20N.m

(183-204kgf.cm) 8.4/0.33 8.7/0.34

25-26 N.m

(255-265 kgf.cm) 13.2/0.52 13.5/0.53

35-36 N.m

(357-367 kgf.cm) 16.2/0.64 16.5/0.65

45-47 N.m

(459-480 kgf.cm) 19.2/0.76 19.7/0.78

 Page 21 

TAKE NOTE OF FUSE SPECIFICATIONS

The air conditioner’s circuit board(PCB) is

designed with a fuse to provide overcurrent

protection. The specifications of the fuse are

printed on the circuit board, such as:

Indoor unit: T3.15A/250VAC, T5A/250VAC.

(applicable for unit adopts R32 refrigerant)

Outdoor unit: T20A/250VAC(for <24000Btu/h

unit), T30A/250VAC(for >24000Btu/h unit)

Wiring

Safety Precautions

WARNING

• Be sure to disconnect the power supply

before working on the unit.

• All electrical wiring must be done

according to local and national regulations.

• Electrical wiring must be done by a

qualified technician. Improper connections

may cause electrical malfunction, injury

and fire.

• An independent circuit and single outlet

must be used for this unit. DO NOT plug

another appliance or charger into the

same outlet.If the electrical circuit capacity

is not enough or there is a defect in the

electrical work, it can lead to shock, fire,

unit and property damage.

• Connect the power cable to the terminals

and fasten it with a clamp. An insecure

connection may cause fire.

• Make sure that all wiring is done correctly

and the control board cover is properly

installed. Failure to do so can cause

overheating at the connection points, fire,

and electrical shock.

• Ensure that main supply connection is

made through a switch that disconnects

all poles, with contact gap of a least 3mm

(0.118”).

•

DO NOT modify the length of the power

cord or use an extension cord.

CAUTION

• Connect the outdoor wires before

connecting the indoor wires.

• Make sure you ground the unit. The

grounding wire should be away from gas

pipes, water pipes, lightning rods,

telephone or other grounding wires.

Improper grounding may cause electrical

shock.

•

DO NOT connect the unit with the power

source until all wiring and piping is

completed.

• Make sure that you do not cross your

electrical wiring with your signal wiring, as

this can cause distortion and interference.

Follow these instructions to prevent distortion

when the compressor starts:

• The unit must be connected to the main

outlet. Normally, the power supply must

have a low output impedance of 32 ohms.

• No other equipment should be connected

to the same power circuit.

• The unit’s power information can be found

on the rating sticker on the product.

Outdoor Unit Wiring

WARNING

Before performing any electrical or wiring work,

turn off the main power to the system.

1. Prepare the cable for connection

a. You must first choose the right cable size

before preparing it for connection. Be sure

to use H07RN-F cables.

Table 8.1: Minimum Cross-Sectional Area

of Power and Signal Cables North America

Rated Current of

Appliance (A) AWG

≤ 7 18

7 - 13 16

13 - 18 14

18 - 25 12

25 - 30 10

NOTE: The fuse is made of ceramic.

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