1.0 PURPOSE
To design a Standard Operating Procedure that describes the procedure for operation and maintenance of Air curtains.
2.0 SCOPE
This Standard Operating Procedure (SOP) is applicable for the operation, and maintenance of air shower at AHF.
3.0 RESPONSIBILITY
3.1 All personnel in the Pharmacology Department shall be responsible for the implementation and compliance with the SOP.
3.2 Head/Designees/Scientists/Study Directors of the Laboratory shall be responsible to ensure the implementation and compliance with the SOP.
4.0 DISTRIBUTION
4.1 The Quality Assurance department is responsible for keeping SOP ‘Master Copy’ approved through the Quality Assurance Head.
4.2 The copy of ‘Control Copy’ of SOP is being distributed in the AHF department and placed near related Equipment/ Instrument as Display Copy.
5.0 DEFINITION(S)
5.1 Definition(s)
5.1.1 An air curtain is a device used to prevent air or contaminants from moving from one open space to another. The most common use is a downward-facing blower fan mounted over an entrance to a building or an opening between two spaces conditioned at different temperatures.
6.0 ABBREVIATION(S)
6.1 Abbreviations
6.1.1 SOP : Standard Operating Procedure
6.1.2 AHF : Animal House Facility
6.1.3 PPEs : Personal Protective Equipment
7.0 PROCEDURE
7.1 Introduction
7.1.1 An air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space. It reduces the penetration of insects and unconditioned air into a conditioned space by forcing an air stream over the entire entrance. The air stream layer moves with a velocity and angle such that any air that tries to penetrate the curtain is entrained. The effectiveness of air curtain preventing infiltration through an entrance ranges from 60 to 80%".
7.2 Instrument description
7.2.1 The air curtain has an integrated control system and can be remotely controlled. The air curtain is available without heat, with electrical heating, and with water heating.
7.3 Operations
7.3.1 Air is drawn in at the top of the unit and blown out downwards so that it shields the door opening and minimizes heat loss.
7.3.2 To achieve the optimum curtain effect the unit must extend the full width of the door opening.
7.3.3 The grille for directing exhaust air is adjustable and is normally angled outwards to achieve the best protection against incoming cold air.
7.3.4 The efficiency of the air curtain depends on the air temperature, pressure differences across the doorway, and any wind pressure.
7.3.5 Mounting
7.3.5.1 The air curtain unit is installed horizontally with the supply air grille facing downwards as close to the door as possible.
7.3.5.2 Minimum distance from the outlet to the floor for electrically heated units is 1800 mm. For other minimum distances.
7.3.5.3 Brackets and Torx bit are enclosed in the gable end packaging upon delivery.
7.3.5.4 Mounting with wall brackets
7.3.5.4.1 Mount the brackets on the wall, and dimension If the wall is uneven the brackets must be compensated for this.
7.3.5.4.2 Hook on the unit at the lower edge of the brackets.
7.3.5.4.3 Bend the top of the console over the unit and slide the unit's screws along the rail into the slots on the consoles, When the bracket is bent once, it must be replaced if bent back more than 45 °.
7.3.5.4.4 Lock the nuts against the brackets.
7.3.6 Horizontal mounting on the ceiling
7.3.6.1 Threaded rods, hanging brackets, and ceiling mounting brackets for ceiling mounting are available as accessories, see accessories pages and separate manuals.
7.3.7 Adjustment of the air curtain and airflow
7.3.7.1 The direction and speed of the airflow should be adjusted considering the load on the opening. Pressure forces affect the air stream and make it bend inwards into the premises (when the premises are heated and the outdoor air is cold). The air stream should therefore be directed outwards to withstand the load. Generally speaking, the higher the load, the greater the needed angle.
7.3.8 Basic setting fan speed
7.3.8.1 The fan speed when the door is open is set using the control. Note that the airflow direction and fan speed may need fine adjustment depending on the loading of the door.
7.3.9 Filter (W)
7.3.9.1 The fan speed when the door is open is set using the control. Note that the airflow direction and the fan speed may need fine adjustment depending on the loading of the door.
7.4 Maintenance
7.4.1 Service, repairs, and maintenance
7.4.1.1 For all service, repair and maintenance first carry out the following:
7.4.1.2 Disconnect the power supply.
7.4.1.3 The front hatch is removed by removing the screws on the top of the unit and then detaching the bent edge at the bottom.
7.4.1.4 After the service, repair and maintenance reattach the front hatch. Place the hatch at the lower edge with the bent edge and fasten it on top with screws.
7.4.1.5 Note that when carrying out work where the end is removed, the outlet grille also detaches.
7.4.2 Unit with water heating
7.4.2.1 The appliance filter should be cleaned regularly to ensure the air curtain effect and the heat emission from the device. A clogged filter is not a risk, but the appliance function can fail.
7.4.2.1.1 Disconnect the power supply.
7.4.2.1.2 The front hatch is removed by removing the screws on the top of the unit and then detaching the bent edge at the bottom.
7.4.2.1.3 Remove the filter and vacuum clean or wash it. If the filter is clogged or damaged, it may need to be changed.
7.4.3 All units
7.4.3.1 Since fan motors and other components are maintenance-free, no maintenance other than cleaning is necessary. The level of cleaning can vary depending on local conditions.
7.4.3.2 Undertake cleaning at least twice a year. Inlet and exhaust grilles, impeller, and elements can be vacuum cleaned or wiped using a damp cloth.
7.4.3.3 Use a brush when vacuuming to prevent damaging sensitive parts. Avoid the use of strong alkaline or acidic cleaning agents
7.4.4 Replacing heating elements/heating package
7.4.4.1 Mark and disconnect the cables to the heating elements/package
7.4.4.2 Remove the mounting screws securing the heating elements/package in the unit and lift the heating elements/package out.
7.4.4.3 Install the new heating elements/package in reverse order to the above.
7.4.5 Replacing the water coil (W)
7.4.5.1 Shut off the water supply to the unit.
7.4.5.2 Disconnect the connections to the water coil.
7.4.5.3 Detach the plastic ends.
7.4.5.4 Detach the intake grille by drilling out the rivet(s).
7.4.5.5 Remove the mounting screws securing the coil in the unit and lift the coil out.
7.4.5.6 Install the new coil in reverse order to the above.
7.4.6 Draining the water coil (W)
7.4.6.1 The drain valve is on the underside of the coil on the connector side. It can be accessed via the front hatch.
8.0 PRECAUTIONS
8.1 All PPEs like an apron, gloves, mask, head caps, and shoe cover should be worn before using the instrument.
8.2 Press Keys softly.
8.3 Clean the equipment with a dry piece of robe or a lightly moistened one, do not use organic solutions.
8.4 Never use abrasive products or dissolvents.
8.5 Never pour water or liquids on the equipment.
9.0 REFERENCES
9.1 Reference
9.1.1 Refer to the manufacturer’s manual for additional information.
END OF THE DOCUMENT
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