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IOM_WPHBA HE-WPHA HE_091a1201_207815_180701_EN
HORIZONTAL WATER-AIR COMPACT PACKAGED UNITS
WPHA HE / WPHBA HE
MAINTENANCE
REFRIGERANT CHARGE
In case it is necessary to add or recover refrigerant, use an electronic scale that is suitably reinforced and prepared to
withstand the handling of the refrigerant bottle.
The charge must be made in LIQUID condition.
The inlet of liquid refrigerant R-410A in the empty tubes causes temperatures below 0ºC until the internal pressure
reaches 7 bars.
Leaks should be repaired immediately.
Never overcharge the system.
Never use compressor as vacuum pump.
If leakage symptoms appear during the operation, it is necessary to leak test.
To find small leaks, you will need a detector for HCF.
If gas leak is detected is necessary to remove and recuperate complete refrigerant charge. Pressurize system with
dry nitrogen. If leakage has been not detected break a vacuum, dehydrate and charge with refrigerant.
Do not reintroduce used refrigerant, send it to an authorized recycling location.
FAN WITH EC MOTOR
Rotation caused by an Air Flow in the opposite direction
When the fan is stopped (no signal, no power supply, etc. ...), the motor control does not intervene if the fan rotates in the
opposite direction (due, for example, to an air flow).
If we put the fan in operation while turning in the opposite direction, first the control will reduce the rotations in a controlled
manner until it reaches the value "0" (stop of the fan). Then the control will make a new start in the proper direction of
rotation.
The higher the number of turns in the opposite direction, the longer the control will be needed to stop the fan.
In the event that the fan rotates strongly in the opposite direction, the control may not be able to start the fan in the proper
direction of rotation.
Information
Never use oxygen to pressurize system or purge lines for leak test. Oxygen reacts violently with
oil, which can cause an explosion resulting in damage, personal injury or death.
WARNING!
If it is necessary to make brazing operation, first fill the circuit with dry nitrogen. Burning
refrigerant 410A results in toxic gas emissions.
WARNING!
Do not disconnect the mains voltage so that the fan can start again!
The safe starting of fans is not guaranteed if they are driven in the opposite direction. If the
application requires a safe start, the manufacturer of the installation or the user has to take
the appropriate measures to prevent a reverse drive.
