Download User Manual of Hairf Precision Air Conditioner PDF

TitleUser Manual of Hairf Precision Air Conditioner
TagsTypes Instruction manuals
File Size1.4 MB
Total Pages30
Document Text Contents
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1) GENERAL DESCRIPTION �
Basic cooling circuit �
Installation warnings

2) INSPECTION
Transport
Unpacking

Positioning





3) INSTALLATION

Electrical connections





4) STARTING UP

Preliminary checks
Starting up instructions




5) SETTING OPERATING PARAMETERS

Generalities
Maximum pressure switch
Minimum pressure switch





6) ROUTINE MAINTENANCE AND CHECKS

Warnings
Generalities
Repairing the cooling circuit
Tightness test
Hard vacuum and drying of cooling circuit
Charging with R407C refrigerant
Environmental protection










7) TROUBLESHOOTING

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3 11 03 Page 15 of 30




Evacuation and charging operations for DX-type units


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1. Introduction:

The contemporaneous presence of liquid and vapour requires for both to be in a state of saturation
[Gibb’s law], as shown in ILJ���. In thermal equilibrated conditions, the pressure in the tank corresponds to
the ambient temperature. Withdrawal of refrigerant from the tank has following effects:

- withdrawal of refrigerant charge Ö pressure drop inside the tank
- pressure drop inside the tank Ö T drop & change of status
- T drop & change of status Ö evaporation of part of the liquid, causing a cooling

down of the liquid
- cooling of liquid Ö thermal exchange with ambient air, further evaporation

of remaining liquid; the original pressure in the tank will
be restored after a certain period of time




























P

Enthalpy h

T tank/ambient


Saturated gas

Saturated
liquid

ILJ����

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2. Full vacuum and charge of the unit

3. Vacuum cycle

In general it is better to apply a “long” rather than a “hard” vacuum: reaching a low pressure too abruptly
may in fact cause that any remaining humidity evaporates instantaneously, thus freezing part of it.























The figure ILJ�� represents a vacuum cycle and an optimal subsequent pressure rise for the refrigeration
devices we manufacture.

Generally in bigger refrigeration systems or if there is a suspicion of an extensive quantity of humidity in
the refrigeration circuit, the vacuum needs to be “broken” by using anhydrous nitrogen. Then the steps of
evacuation need to be repeated as described before. This operation facilitates the removal of remaining
and/or frozen humidity during the evacuation process.


4. Evacuating a circuit “contaminated” with refrigerant

The first step is to remove the refrigerant from the circuit. To do this a specific machine is necessary with
a drying compressor in order to recover the refrigerant.

Refrigerants all tend to dissolve in oil [compressor sump]. The "2LO" figure illustrates a specific property
[Charles’ Law] of gases, which are more soluble in liquids as the pressure increases but less soluble as
the temperature increases.


















P [Pa]

Time
200 s

6

150

T1

T2

ILJ����

T oil
Pressure

% of refrigerant in oil

³2LO´�ILJ��

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On the next pages you will find a list of the most common reasons that may cause the package unit to fail
or any malfunction. This causes are broken down according to easily identifiable symptoms.



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7KH�XQLW�GRHV�QRW�VWDUW� No power supply Check if power is being supplied

both to the primary and auxiliary
circuits.


The electronic card is cut off from
the power supply

Check the fuses

Alarms have been released Check whether any alarms are
signalled on the microprocessor
control panel, eliminate the causes
and restart the unit.

The phase sequence is wrong Invert two phases in the primary
power line after disconnecting
them upstream from the unit


7KH�FRPSUHVVRU�LV�QRLV\� The compressor is rotating in the

wrong direction
Check the phase sequence relay.
Invert the phases on the terminal
board after disconnecting the unit
and contact the manufacturer.






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Insufficient airflow through the
condenser

Check for the presence of
obstructions in the condenser
section ventilation circuit

Check whether the condenser coil
surface is obstructed

Check the condensation control
device [optional]


Presence of air in the refrigerant

circuit, as revealed by the
presence of bubbles in the flow
indicator also with sub-cooling
values exceeding 5 � C

Drain and pressurise the circuit
and check for leaks. Evacuate
slowly [for more than 3 hours] until
reaching a pressure of 0.1 Pa and
then recharge in the liquid phase

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Unit overcharged, as revealed by a
Sub-cooling of more than 8 � C

Drain the circuit

Thermostatic valve and/or filter
obstructed. These symptoms may
also occur in the presence of an
abnormally low pressure.

Check the temperatures upstream
and downstream from the valve
and filter and replace them if
necessary.

/RZ�FRQGHQVDWLRQ�SUHVVXUH� Transducer fault Check the efficiency of the
condensation control device
[optional]

/RZ�HYDSRUDWLRQ�SUHVVXUH� Malfunctioning of thermostatic
valve

Warming the bulb with your hand,
check whether the valve opens and
adjust it if necessary. If it does not
respond, replace it.

Filter dryer clogged Pressure drops upstream and
downstream from the filter should
not exceed 2� C. If they do, replace
the filter.

Low condensation T Check the efficiency of the
condensation control device [where
present]

Low level of refrigerant Check the refrigerant level by
measuring the degree of Sub-
cooling; if it is below 2� C replenish
the charge

The internal thermal protection
device has tripped

In the case of compressors
equipped with a protection module,
check the thermal contact. Identify
the causes after restarting.

7KH�FRPSUHVVRU�GRHV�QRW�VWDUW� The circuit breakers or line fuses
have been tripped by a short circuit

Pinpoint the cause by measuring
the resistance of the individual
windings and the insulation from the
casing before restoring power.

One of the high or low pressure
switches has tripped

Check on the microprocessor,
eliminate the causes.

The phases have been inverted in
the distribution compartment

Check the phase sequence relay.


:DWHU�RXW�IURP�WKH�XQLW� The drain pan hole is closed Open the front panels, remove the

sheet metal just below the e-panel
(Down Flow units) and clean it


:DWHU�RXW�IURP�WKH�XQLW� The siphon is missing Check for the presence and

provide for a new one.

:DWHU�RXW�IURP�WKH�XQLW� The Air flow is too high Reduce the fan speed up to

reaching the nominal air flow.

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