Telca TAC-12D-10 Service Manual - User Manual

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Telca air conditioner unit

TAC-12D-10

Service manual

Document No.: TELCA0.010.0205

Edition No.: V1.0

TELCA SCIENCE&TECHNOLOGY CO., LTD.

Service manual: TAC-12D-10

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Contents:

1. General

2. Technical data

3. Assembly

4. Electrical connection

5. Commencing operation and control behavior

6. Maintenance

General

The cooling circuit is designed in the form of a maintenance-free, hermetically sealed

system. The cooling unit is filled with the required quantity of refrigerant at the factory,

checked for leaks, and subjected to a functional test run. The installed maintenance-free

fans are mounted on ball bearings, protected against moisture and dust, and fitted with a

temperature monitor. The life expectancy is at least 30,000 operating hours. The cooling

unit is thus largely maintenance-free. All that may be required from time to time is to

clean the components of the external air circuit using a vacuum cleaner or compressed

air if they become visibly dirty.

Maintenance interval:

12 months

. Depending on the level of contamination in the

ambient air, the maintenance interval may be reduced to suit the air pollution intensity.

Technical data

Model No.

TAC-12D-10

Dimensions WxHxD

420 x 1000 x 180 mm

Cooling output @L35/L35

1200 W

Heating output

1000 W

Rated voltage Volt/Hz

220VAC, 50/60Hz

Rated current

3.3 A (Cooling)
4.5 A (Heating)

Temperature range

-40°C ~ +55°C

Power consumption

720 W (Cooling)
1000 W (Heating)

Air circuit (External)

570 m

Air circuit (Internal)

450 m

Noise

62dB

Refrigerant

R134a

Protection category

IP55

Weight

34Kg

Special voltages available on request.

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Assembly

Mechanical design, electrical connection and possible repair works must only be carried

out by qualified personnel. Only use original spare parts!

3.1 Assembly instructions

Prior to mounting, ensure that

●

The site of cabinet and hence the arrangement of air conditioner unit, is selected

in such a way as to ensure good ventilation;

●

The location is free from excessive dirt and moisture;

●

The mains connection ratings, as stated on the name plate of the unit, are

available;

●

The ambient temperature does not exceed +55°C;

●

The packaging shows no signs of damage. Traces of oil on damaged packaging

are an indication of refrigerant loss and leakage in the unit system. Any damage

to the packaging may be the cause of subsequent malfunctions;

●

After successful test and wire binding, the wire inlet of the equipment should be

hermetically sealed. Condensation will occur and cooling effect will reduce if the

cabinet is leaky;

●

The distance of equipment from all obstacles around should not be less than

200mm;

●

Air inlet and outlet are not obstructed on the inside of the cabinet;

●

Air conditioner unit should only be fitted horizontally in the specified position.

Max. deviation from true horizontal:2º;

●

To avoid an increase in condensation, the unit should be switch off immediately

when the equipment door is opened;

●

Gaskets should be bonded to the fixing frame for the unit in door or wall of the

cabinet.

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3.2 Assembly

Uplift air conditioner unit into front door of the cabinet, position it on the fixing frame

bonded with gaskets, and rivet it with M4 nuts. Care must be taken to ensure that the

internal air outlet of the unit is contraposed to that of the cabinet(see figure 3.1)

Fig.3.1

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Electrical connection

After verifying that the connection voltage and frequency match the nominal values

specified on the rating plate, insert one end of power supply cable with the plug into the

socket established in the unit, please notice the direction of the connector, avoid put

wrong, and tighten the screws of the plug to secure the connection. For detail connection

details, please view figure 4.1 and figure 4.2.

CN4

CN3

External Fan

Compressor

Blue

Black

Red

Black
Brown

Blue

Fuse

TAC_CTL V1.1

Heater

220V/60Hz

Brown (L)

Blue (N)

Yellow/Green

Internal Fan

2 uF

Black
Brown

Blue

Fig.4.1

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Fig. 4.2 D-SUB 9PIN female

Commencing operation and control behavior

Following the completion of mounting and a waiting period of approximately 30 minutes

(to allow oil to collect in the compressor in order to ensure lubrication and cooling)

electrical connection can be made.

The cooling unit operates automatically, i.e. after electrical connection, the internal fan

will run continuously to circulate the air inside the enclosure. This results in a uniform

temperature distribution in the cabinet. The compressor and heater (optional) are

controlled by a microcontroller.

●

Compressor and external fan control

If the temperature of internal air inlet exceeds P0 (35°C), the external fan and

compressor will be switched on.

Contrarily, if the temperature of internal air inlet is lower than P0-P1 (35-6=29°C), the

external fan and compressor will be switched off.

Important:

In order to avoid cyclic operation, switch-on of compressor is delayed by

about 3 minutes since last switch-off, please don’t take this as a failure!

●

Heater control (optional)

If the temperature of internal air inlet is lower than P2 (5°C), the heater will be switched

on.

Contrarily, if the temperature of internal air inlet exceeds P2+P3 (5+10=15°C), the heater

will be switched off.

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●

Parameters setting

Fig.5.1 Display terminal (optional)

The display terminal consists of a LED display which indicates the inside temperature.

Press ▲ or ▼ button to display the evaporator temperature, the LED display will flash.

Parameter setting range

Parameters

Default Value

Setting Range

Note

35 °C

25~40

Cooling temperature

6 °C

3~15

Cooling temperature difference

5 °C

0~15

Heating temperature

10 °C

3~15

Heating temperature difference

45 °C

40~60

High temperature alarm

0 °C

-9~10

Low temperature alarm

0 °C

-9~10

Evaporator freezing alarm

15 min

1~60

Cooling cycle time when

sensors defective

1~10

Machine address

Keys introduction

EXT

Press the

EXT

button once to setting the parameter P2, press ▲ or ▼ button

to modify the setting value, press

EXT

button to exit, otherwise exit

automatically after 5 seconds delay.

SET

Press the

SET

button once to setting the parameter P0, press ▲ or ▼ button

to modify the setting value, press

SET

button to exit, otherwise exit

automatically after 5 seconds delay;

Press the

SET

button for more than 3 seconds to enter the parameters setting

menu, press ▲ or ▼ to select the parameter to modify, press

SET

button

once to enter the appropriate parameter setting state, press ▲ or ▼ to modify

the setting value, after being adjusted, press the

EXT

button to exit, otherwise

exit automatically after 5 seconds delay.

▲ Up button

▼ Down button

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●

LED status indication

The

WORK

LED light at the left side of the screen is used as working indicator lights,

flashing is to indicate the delay of cooling; if the LED is always on, it indicates it is on the

state of cooling or heating;

The

SET

LED light at the left side of the screen is used as setting indicator lights, if the

LED is always on, it indicates it is on the state of setting.

●

Door limit switch

If a door limit switch is used and the cabinet door is open (contact is closed when door is

open), the cooling unit (external fan and compressor) will switch off after approx 5 s,

thereby avoiding an increase in condensation while the door is open. To avoid cyclic

operation, switch on of compressor and external fan is delayed by about 3 minutes after

the door has been closed.

●

Alarm output

The air conditioner is permanently controlled by the microcontroller. Faults which can

occur are registered and will be passed on the LED display panel, also the dry contact

alarm.

Alarm code and system message

Alarm code

System message

Internal temperature exceeds P4

Internal temperature below P5

Evaporator freezing

High/low 220VAC power supply

Condenser high pressure

Internal temperature sensor failure

Evaporator temperature sensor failure

Door open

The dry contact alarm is triggered if any of the above alarm is detected.

The dry contact alarm functions as follows:

Storage conditions: Open contact

Operation:

Closed contact

Alarm:

Open contact

The maximum load of dry contact is:

Resistive load 3A@250VAC or 3A@30VDC

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●

Self-test

To enter the self-test function, press the

SET

button and ▲ button for 5 seconds and

release.

Self test steps:

1 - LED scanning

3 seconds

2 - Internal Fan

-- seconds (running all the time)

3 - Heating

30 seconds

(Heater)

4 - Cooling

60 seconds

(Compressor and external fan)

5 - External fan

10 seconds

When the self test is completed, controller will automatically exit. During self-testing, you

can press the

EXT

button to exit.

Maintenance

6.1 Trouble Shooting

The air conditioners are designed for trouble free life as long as the inlet filter is

maintained in a clean condition. To aid in service definition the service personnel can

initially identify probable cause by referring to the following trouble shooting chart.

Problem

Potential Cause

Solution

No Power

Check power source and
electrical connections

Fuse Blown on Control Board

Replace with 3.15A slow blow
fuse

Unit not running

Faulty Control components

Replace control board

Filter clogged

Clean or replace filter

Blocked evaporator or
condenser coil

Clean coil

Evaporator or condenser fan
not operating

Replace motor, capacitor or
entire assembly

Unit not cooling
sufficiently

Loss of refrigerant or oil leaks

Return to Telca or locate and
repair leak

Insufficient heat load or unit
oversized for application

Contact Telca

Ice on evaporator coil

Failed evaporator fan

Replace evaporator fan motor
or assembly

Condensate draining
continuously

Enclosure not properly
sealed

Check and seal all openings

Defective fan motor or wheel Replace fan sub assembly.

Excessive vibration

Compressor loose

Tighten mounting bolts

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6.2 Evaporator and Condenser Coil Cleaning

Periodically the coils should be cleaned. No fixed period for cleaning can be provided

due to the varying environments in which the air conditioner may be installed.

However once the coils become visibly coated with dust it is recommended that they

be cleaned with a brush or compressed air. Both sides of the coils should be

inspected regularly. (at least once every 12 months.)

Caution:

Prior to any maintenance work, the air conditioner must be switched free

from potential on the supply side.

If in doubt, Contact

IT Enclosure Systems

for

assistance. Always have the Model #,

Serial # date available before you

call.

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