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3.8 Connecting therefrigerant pipes

CAUTIONS DURING BRAZING

Replace air inside the tube with nitrogen gas to prevent copper oxide film from forming during the brazing process. (Oxygen, carbon dioxide
and Freon are not acceptable.)

Do not allow the tubing to get too hot during brazing.The nitrogen gas inside the tubing may overheat, causing refrigerant system valves to

become damaged. Therefore allow the tubing to cool when brazing.

Use a reducing valve for the nitrogen cylinder.

Do not use agents intended to prevent the formation of oxide film. These agents adversely affect the refrigerant and refrigerant oil, and may

cause damage or malfunctions.

TIGHTENING

In the table below are shown the pipes diameter for each unit 

For the flare nuts at tubing connections, be sure to use the flare nuts that were supplied with the unit, or else flare nuts for R410A. The refrige-
rant tubing that is used must be of the correct wall thickness as shown in the table below.
Because the pressure is approximately 1.6 times higher than conventional refrigerant pressure, the use of ordinary flare nuts or thin-walled
tubes may result in tube rupture, injury, or asphyxiation caused by refrigerant leakage.
In order to prevent damage to the flare caused by overtightening of the flare nuts, use the table above as a guide when tightening.

When tightening the flare nut on the liquid tube, use an adjustable wrench with a nominal handle length of 200 mm.

INSULATING THE REFRIGERANT TUBING

Thermal insulation must be applied to all units tubing, including distribution joint (field supply). For gas tubing, the insulation material must be
heat resistant to 120°C or above. For other tubing, it must be heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or greater.
If the conditions inside the ceiling exceed DB 30°C and RH 70%, increase the thickness of the gas tubing insulation material by 1 step.

ø Tube

Tightening torque

Tube thickness

ø 6,35 (1/4”)

14 - 18 N*m

0,8 mm

ø 12,7 (1/2)”

49 - 55 N*m

0,8 mm

Unit

KRE-500DX1 

KRE-1000DX1 

Gas Pipe

ø 12,7 mm

Liquid Pipe

ø 6,35 mm

3.9 Connecting PRE-DX

• The electric heater shall be connected to the suction of fresh air stream, both upstream and downstream to a duct of the same nominal diam-

eter; the duct must be fully inserted on the heater sleeve up to the stop, so that it fits the airtight gasket.

• It is suggested to mount the heater as close as possible to the unit to which it is connected. 

For PRE-DX heater the ambient temperature

must be from -25°C to +30°C; degree of protection IP40.

• The heater can be installed both horizontally and vertically; in case of  horizontal electric heater, the electric box must be placed according to

one of the positions.

• The heater must be adequately supported, so that unit connections are free from any stress.
• The heater must not be insulated.

For BE heater, the supply air temperature must be lower than 50°C and the air speed must be higher than 2 m/s. Make sure that the
heater is turned ON only when the fan is switched on. The fan must continue to run at least 30 seconds after the heater has been
turned off.

• Connections and cables that are used for them have to be supplied by the installer.
• For power supply of the electric heater use a 3-wire cable (line, neutral, ground), sized for the specific current of the selected model. First,

pass along the free ends of the three cables from the inside of electrical board to the outside, through the glands on the basic unit.

pag. 

1

4

Flare insulator

Insulation tape (white)

Flare union

Unit side

Flare nut

Tube insulator

(not supplied)

Heat resistant

Insulation

Liquid tubing

Two tubes arranged together

Gas tubing

Modello / 

Model

PRE-DX

Pt pre Ampere

Dt nom

Stadi /

Stages V / ph / Hz

Ø

A

B

C

Peso / 

Weight

kW

°C

mm mm mm mm

kg

KRE-500DX1 

1.5

6.5

9.0

1

230 / 1 / 50 200 400 289 200

4.6

KRE-1000DX1 

2.5

10.9

9.0

1

230 / 1 / 50 250 400 342 260

4.8

Содержание KRE-500DX1

Страница 1: ...KRE 500DX1 KRE 1000DX1 INSTALLATION USER MAINTENANCE MANUAL Cross flow heat recovery...

Страница 2: ...Positioning of the unit page 12 3 6 Drain tray connection page 12 3 7 Connection to the ducts page 12 3 8 Connecting the refrigerant pipes page 13 3 9 Connecting PRE DX page 14 SECTION 4 ELECTRICAL CO...

Страница 3: ...4 2 421 6 9 8EBA E45 8 4 6AEF FG D8 94E6 6A A F86 6A R 4 EA6 8FO U D8 EFD4F4 BD8EEA 4 4 8D4 7 A 8D6 A 7 8DA 4 F4 4 8D4 FIADF 6 8 9TD 7 8 F86 E6 8 F8D 4 8 KGE4 8 EF8 8 U EF 74E F8D 8 8 58 78D 4 78 E 4...

Страница 4: ...n workmanlike that is in compliance with the regulations in force and with the indi cations of this handbook The distributor Company does not answer to possible damages to people animals or things due...

Страница 5: ...The use of the same for different purposes from those envisioned not conform to that described in this manual will make any direct and or indirect liability of the Manufacturer automatically become n...

Страница 6: ...nit control to use fresh air free cooling when convenient Low consumption high efficiency low noise direct driven fans with EC motors Supply section complete with DX coil R410A fitted with solenoid co...

Страница 7: ...e side at nominal conditions 3 Outside air at 5 80 RH room air at 20 C 50 RH 4 Outside air at 32 50 RH room air at 26 C 50 RH 5 Refeer to EU 1253 2014 regulation at nominal pressure air conditions ref...

Страница 8: ...ves 0 50 100 150 200 250 300 0 100 200 300 External static pressure Pa 400 500 600 Air flow m3 h 0 100 200 300 400 500 0 200 400 600 800 1000 1200 1400 External static pressure Pa Air flow m3 h KRE 50...

Страница 9: ...d are supplied packed in a suitable covering and fixed to the inside or outside of the unit 2 2 Handling and transport For the handling in function of the weight use adequate means in conformity to th...

Страница 10: ...all cost to touch the parts in motion or to intefere with the same ones Do not proceed with cleaning or maintenance operations before switching off the electric power supply The maintenance and the su...

Страница 11: ...450 mm MINIMUM FREE SPACE FOR CHECKING AND MAINTENANCE CEILING FALSE CEILING pag 11 Modello KRE DX KRE 500DX1 KRE 1000DX1 A mm 450 450...

Страница 12: ...advised to interpose an antivi brating joint between the air outlets and yhe ducts The electrical continuity between duct and machine must however be guaranteed through a earth cable The distance bet...

Страница 13: ...aminants moistu re dirt metal filings etc from entering the tubing Remove the flare nut from the unit and be sure to mount it on the copper tube Make a flare at the end of the copper tube with a flare...

Страница 14: ...and RH 70 increase the thickness of the gas tubing insulation material by 1 step Tube Tightening torque Tube thickness 6 35 1 4 14 18 N m 0 8 mm 12 7 1 2 49 55 N m 0 8 mm Unit KRE 500DX1 KRE 1000DX1...

Страница 15: ...off switch and of everything that is necessary for the protection of the electri cal components as close as possible to the unit Connect the unit to an effective earth using the appropriate screw fitt...

Страница 16: ...APPRESENTATI I COLLEGAMENTI DA EFFETTUARSI A CURA DELL INSTALLATORE DASHED LINES SHOW THE CONNECTIONS TO BE CARRIED OUT BY THE INSTALLER exhaust fan supply fan Bypass Electrical heater Humidity sensor...

Страница 17: ...e inlet pipe of the evaporator T2 is an AHU evaporator intermediate temperature sensor it should be installed at the intermediate pipe of the evaporator T2B is an AHU evaporator outlet sensor it shoul...

Страница 18: ...on the left FIG 4 4b 4 4 2 Insertion of the electrical supply line and signals for accessories Screw down the cable glands placed outside the QE insert the cable into the cable gland cover then into t...

Страница 19: ...tem connects to the indoor unit centralized con troller the actual address and the virtualaddress will be displayed on the centralized controller e g when the capacity code of independent control box...

Страница 20: ...umber of slave AHU control boxes connected in parallel is 1 SW1 3 and SW1 4 are 10 the number of slave AHU control boxes connected in parallel is 2 SW1 3 and SW1 4 are 11 the number of slave AHU contr...

Страница 21: ...lid SW3 3 and SW3 4 are 11 temperature compensa tion in heating mode is 0 C Follow Me function SW3 3 and SW3 4 are 11 No temperature compen sation for outlet air temperature control by default Valid f...

Страница 22: ...TA and T2B factory default SW9 2 is 1 Multiple AHU control boxes are connected in parallel In the event of multiple coils one coil is connected to one control box shielding faults from the slave unit...

Страница 23: ...ted 14 E9 only for wired controler 15 Error of electronic expansion valve coils Eb restore after power on again ODU error 17 Ed Water level alarm error EE 18 Low temperature alarm 19 H2 High temperatu...

Страница 24: ...HP of control box Control box network address the same as the communication address Set temperature Ts Room temperature T1 Actual T2 AHU temperature Actual T2A AHU temperature Actual T2B AHU temperatu...

Страница 25: ...peed To set the swing function heater function1 to cancel the timer heater function1 to confirm the timer Button Functions 1 Mode 6 Adjust downwards 2 Fan speed 3 Swing 9 Cancel KCT 03 SRPS A ON OFF C...

Страница 26: ...l spin to indicate that the indoor unit has started running see Figure 6 1 on the wired controller will will stop spinning as the indoor unit stops running 4 2 Mode Setting Press Mode button as shown...

Страница 27: ...e fan speed in turn as shown in Figure 6 6 Fan speed button to set Auto and Dry Auto press Fan speed button Field Setting to adjust the default fan speed Auto Speed 1 Speed 2 Speed 3 Speed 6 Figure 6...

Страница 28: ...s out through the proper handles Remove the 2 filter by making them scroll on the slides CLEANING OF THE HEAT EXCHANGERS Remove with the vacuum cleaner the dust that can be present inside the heat exc...

Страница 29: ...f the unit Unlock the electric connector After laying the module on a flat surface unscrew carefully the quartz capacitor C Remove the external net R if it should be difficult rotate it lightly around...

Страница 30: ...orrespond to that of the nameplate The rotor turn backwards Noise Excessive air flow Wear or crack in the pads Unbalanced fan Foreign bodies in the case Strong vibrations Unbalanced impeller because o...

Страница 31: ...e refrigerant outlet gas 1 18 DX coil air temp probe 2 19 ePM2 5 Filter pressure switch CT0AFS930800PF00 1 20 Heat recovery temp probe 4 KRE 1000DX1 1 Spigot MV00BOC0MICH0800 4 2 Right bracket 2 3 Ele...

Страница 32: ......

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