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22

English 01/07

ACCURATE AX* -  AW*

Empty and recharge the circuit.

A) Air or incondensable gas in the refrigerant
circuit, seen by the presence of bubbles, despite
measuring a high subcooling.

Check the operation and the correct direction
of rotation of the fans on the outdoor heat
exchanger.
Check that the exchanger is not dirty and
remove any material that may be blocking it
(leaves, paper, seeds, dust, etc.) with a jet of
compressed air or with a brush;
Check the outdoor unit for any obstacles to
the flow of air and any recirculation of the coo-
ling air;
Check that the temperature of the cooling air
does not exceed the design value.

B) Insufficient air flow-rate to the remote heat
exchanger or air too hot

Check the flow-rate, the pressure and the
temperature of the cooling water in the clo-
sed circuit;
Check the calibration and the operation of the
pressure control valve.

Insufficient water flow-rate to the condenser 
or water too hot.

Remove refrigerant from the circuit.

Excessive refrigerant charge; condenser
partially flooded. Excessive subcooling of the
liquid at the condenser outlet.

Check the opening of the valves.

Valves on the high pressure side of the circuit
partially closed.

HIGH COMPRESSOR
DISCHARGE
PRESSURE 

FAULT

CAUSE

SOLUTION

Check the operation of the condenser fans
and the corresponding protection device;
repair or replace the faulty fans;
Check the calibration and the operation of the
remote condenser fan pressure switch or the
speed controller.
(See CONTROLLING THE CONDENSING
PRESSURE)

The condensing pressure control system
isn't working.

See “HIGH COMPRESSOR DISCHARGE
PRESSURE”.

The system is affected by an excessive
discharge pressure

HIGH PRESSURE
SWITCH ACTIVATED
(high compressor
discharge pressure)

Check the calibration and the operation of the
condenser fan pressure switch or the speed
controller;

The condensing pressure control system
isn't working (see the control panel manual).

Check the temperature of the cooling water;
Check the calibration and the operation of the
pressure control valve (if fitted);
Install a pressure control valve to manage the
flow-rate of water according to the conden-
sing pressure.

Excessive water flow-rate to the condenser
or water too cold.

See “LOW COMPRESSOR SUCTION
PRESSURE”.

Suction pressure too low

LOW COMPRESSOR
DISCHARGE
PRESSURE

Содержание ACCURATE

Страница 1: ...s ACCURATE Direct expansion Direct expansion AXO air outlet from the top AXU air outlet from the bottom Water cooled AWO air outlet from the top AWU air outlet from the bottom frame 1 07 10 frame 2 15 18 frame 3 20 26 29 frame 4 39 30 40 50 frame 5 55 60 70 ...

Страница 2: ......

Страница 3: ... the drive belts 17 Humidifier 18 Terminal and board configuration 19 Troubleshooting 19 U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A U I A A I U In some parts of this manual the following symbols are used WARNING for actions that require special care and suitable preparation PROHIBITED for actions that absolutely MUST NOT ...

Страница 4: ... traction high ESP 3 speeds from 07 to 18 kw FANS T CentrifugalV belts ESP 20 Pa from 21 to 88 kw U CentrifugalV belts ESP 50 Pa from 21 to 88 kw X CentrifugalV belts ESP 100 Pa from 21 to 88 kw Y CentrifugalV belts ESP 150 Pa from 21 to 88 kw Z CentrifugalV belts ESP 200 Pa from 21 to 88 kw VOLTAGE M 230V 1Ph N 50Hz T 400V 3Ph N 50Hz B Over intake from the bottom AIR FLOW O Over intake from the f...

Страница 5: ...moke sensor 5 Fire smoke flooding sensor 6 Flood sensor 7 Dirty filter fire smoke sensor 8 Dirty filter flood sensor 9 Dirty filter fire smoke flood sensor 0 Class 0 panels A1 DIN 4102 1 Class 1 panels STD insulation HEAT AND SOUND 2 Class 1 panels soundproof insulation INSULATION 3 Class 0 panels A1 DIN 4102 soundproofing hoods on the compressors 4 Class 1 panels STD insulation soundproofing hood...

Страница 6: ...cuit and in some cases two circuits See the DIGIT on the previous page The compressor pumps the hot refrigerant gas into the indoor condenser made from braze welded steel plates The liquid refrigerant then flows to a liquid receiver installed in the indoor unit to ensure a constant flow of refrigerant to the thermostatic valve and subsequently the evaporator Here the liquid refrigerant absorbs the...

Страница 7: ...rom outlet plenums at the front fig 1 fig 2 fig 3 fig 4 1 OVER units with intake from the front and outlet plenum 2 OVER units with intake from the front and outlet from the top 3 OVER units with intake from under the floor and outlet from the top 4 OVER units with intake from the rear and outlet from the top 5 UNDER units with intake from the top and front outlet plenum 6 UNDER units with intake ...

Страница 8: ... 98 0 99 1 0 98 0 95 No of compressors n 1 1 1 1 1 1 1 Total power input kW 1 72 2 52 3 83 4 4 5 05 6 75 7 65 N circuits n 1 1 1 1 1 1 1 Air flow rate mc h 2400 2400 4900 4800 6500 8000 8000 No of fans n 1 1 2 2 1 1 1 Total power input kW 0 49 0 49 0 9 0 9 1 8 2 2 2 2 ESP 3 Pa 20 20 20 20 20 20 20 Noise level 5 49 51 55 55 55 56 56 Standard power supply V ph Hz 400 3 N 50 Width mm 600 1000 Depth m...

Страница 9: ...l cooling capacity 1 kW 39 4 30 2 42 50 4 58 61 6 70 6 Sensible cooling capacity 1 kW 39 4 30 2 42 48 4 58 61 6 68 4 SHR 1 1 1 1 0 97 1 1 0 97 Total cooling capacity 2 kW 35 8 27 5 38 3 45 4 52 8 56 63 6 Sensible cooling capacity 2 kW 35 8 27 5 38 3 45 52 8 56 63 SHR 2 1 1 1 0 99 1 1 0 93 No of compressors n 1 2 2 2 2 2 2 Compressor power input kW 9 75 7 66 9 4 13 1 12 6 15 6 19 6 N circuits n 1 2...

Страница 10: ...2 R407C Open any valves in the unit or in the system to ensure that all the components are involved in the emptying operation Connect a high efficiency vacuum pump to the Schrader fittings or to the 1 4 SAE fittings on the compressor suction and discharge side Connect a cylinder of refrigerant to the charge fittings Empty the lines ensuring an absolute pressure of less than 100 Pa 0 7 mm Hg for an...

Страница 11: ... required available as an accessory for each condenser in this case the supply pressu re must not be less than 200 kPa 2 bar IMPORTANT do not use water cooled using an evaporative tower as the condensers will rapidly become fouled by lime scale Water in a closed circuit The condensers on the units are supplied with water pumped in a closed circuit and cooled by external radiators check that the cr...

Страница 12: ...ne on each refrigerant circuit Air flow sensor F3 and dirty filter sensor F4 differential pressure switches Temperature sensor BT2 versions C and T or room temper ature and humidity sensor BH1 on the units with humidity control Some versions in addition have the following sensors Safety thermostat TH1 in the versions with electric heaters with the reset button accessible on the right hand side of ...

Страница 13: ...asured using a pressure gauge connect ed to the pressure test point on the outlet valve 1 2 3 4 5 CALIBRATINGTHE CONTROL AND SAFETY DEVICES A I U After starting the air conditioner make the following adjustments Room temperature cooling and heating set point Relative humidity set point for humidification and dehumidifi cation Dirty filter differential pressure switch see the paragraph on CALIBRATI...

Страница 14: ... the adjustment screw E to calibrate the differential pres sure switch on a scale from 0 5 to 4 0 mbar 50 to 400Pa If having to replace the pressure switch unscrew the two fasten ing screws D remove the rubber hoses connected to the pres sure test points and and remove the electrical cables con nected to terminals 1 2 and 3 To install the new pressure switch perform the same operations in the reve...

Страница 15: ...of the servomotor EMERGENCY MANUAL OPERATION The valve can be operated manually in the event of faults to the servomotor or the control system using the manual control knob located near the servomotor TEMPERATURE AND HUMIDITY PROBE A I U The figure shows the optional temperature and humidity probe If having to replace the probe release the white plastic cover by pressing point A with a screwdriver...

Страница 16: ...3N 50 22 8 64 40 8 90 28 8 72 7 40 8 90 100 25 70 400 3N 50 27 1 74 45 1 100 33 1 82 7 45 1 100 100 25 B cooling only R cooling only heaters H cooling only plus humidifier dehumidification T complete version cooling only heaters humidifier dehumid Centrifugal fans Radial fans Mod V ph Hz n kW OA FLA LRA n Volt kW OA FLA LRA 07 10 230 1 50 2 4 17 5 15 18 230 1 50 2 8 35 20 26 29 400 3N 50 3 9 13 39...

Страница 17: ...nance operations can be summarised as follows Clean the air filter Check and clean the condenser coils Check the water cooled condensers for fouling Check and clean the drains Check the drive belts Check the humidification system General examination of the overall operation of the appliance Visual check of the condition of the pressurised containers Cleaning the air filter Authorised personnel mai...

Страница 18: ...equired add ordinary descaler to the section of cir cuit involved This operation must be carried out with the unit off and after having made sure that the appliance is disconnected from the power supply Checking the drive belt Authorised personnel maintenance mechanic Checks On the units with fans coupled to the electric motor by pulleys and drive belts after a certain number of operating hours th...

Страница 19: ... a description of how to assemble and dismantle the pul leys if these require replacement or repair Dismantling Take out the 2 safety screws and remove the pulley from the elastic ring See Fig A Assembly Slide the elastic ring onto the motor pin Insert the pulley on top then tighten the fastening screws See Fig B ELECTRIC HEATERS The overall power of the electric heaters is divided into a num ber ...

Страница 20: ...set value due to the lowering of the water level the fill valve 7 is opened The drain valve 8 is activated cyclically depending on the char acteristics of the supply water so as to maintain the optimum salt concentration inside the cylinder 6 The only periodical maintenance operations required are the inspection and cleaning of the parts in the steam production unit The operations indicated below ...

Страница 21: ... the air conditioner FAULT CAUSE SOLUTION THE AIR CONDITIO NER DOESN T START See the controller manual The parameter settings on the microprocessor controller are not correct See LOW OR NO AIR FLOW The air flow rate is too low or null Check the electrical connections and the configuration of the controller The probe isn t working Check the thermal load in the room being air conditioned Thermal loa...

Страница 22: ...hase Close the valve using the manual control knob and replace the servomotor The three way valve in the chilled water circuit is stuck in the open position ROOMTEMPERATURE TOO LOW FAULT CAUSE SOLUTION See the controller manual The parameter settings on the microprocessor controller are not correct Check and calculate the latent load check the flow rate and the conditions of the outside air check ...

Страница 23: ...aken off the larger particles of dust Replace the filter if excessively clogged Check the correct calibration of the dirty filter differential pressure switch F4 The filters are blocked possible activation of the dirty filter alarm See the paragraph on AIR DISTRIBUTION Obstructions to the air flow Check the resistance of the fan windings after resetting measure the voltage and power input The fan ...

Страница 24: ...ing of the liquid at the condenser outlet Check the opening of the valves Valves on the high pressure side of the circuit partially closed HIGH COMPRESSOR DISCHARGE PRESSURE FAULT CAUSE SOLUTION Check the operation of the condenser fans and the corresponding protection device repair or replace the faulty fans Check the calibration and the operation of the remote condenser fan pressure switch or th...

Страница 25: ...ate is too low or null Check the opening of the valve Liquid receiver outlet valve not completely open Check that the thermostatic valve superheating value is correct check that the valve sensor bulb is not discharged and that it is correctly positioned secured and insulated Refrigerant filter blocked Check the liquid subcooling at the condenser outlet if necessary restore the charge Insufficient ...

Страница 26: ...24 English 01 07 ACCURATE AX AW ...

Страница 27: ......

Страница 28: ...Dé Longhi Group Via L Seitz 47 31100 Treviso Italia COD 5787001000 ...

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