EQLK, DIRECT-DRIVEN INSTALLATION AND MAINTENANCE INSTRUCTIONS Contents Page Installation options...... 2 Checks to be made prior to commissioning...2 Electrical connections.....2 Measures before starting..... 3 Installation of separately supplied frequency inverters... 3 Airflow measurement.. 4 Maintenance... 5 Cleaning...... 5 Picture shows the fan with integral motor. Other motor options are present. To remove the fan from the air handling unit casing.... 5 To replace the motor...... 6
2 EQLK FAN, INSTALLATION OPTIONS EQLZ-37 Safety guard, inlet EQLZ-36 Safety guard, outlet Connection Accessories for the outlet: EQLZ-26 Connection piece EQLZ-25 Flexible connection EQLZ-27 Counterflange EQLZ-24 Protective screen for door EQLZ-28 Protective screen CHECKS TO BE MADE PRIOR TO COMMISSIONING Check that the fan complies with the EU machinery directive. All inspection doors on the fan section and other function is equipped with door locks with a key. Additional safety can be added. EQLZ-37 is a protective screen which can be placed at the inlet to the fan section. EQLZ-36 is a protective screen that can be added to the outlet of the fan section if another AHU function is placed downstream of the fan. EQLZ-28 is protective screen when the fan section is placed at the outlet of the AHU. EQLZ-24 is additional protection behind the inspection door at the fan section. Check that a qualified electrician has handed over written approval for commissioning. Check that the fan impeller rotates freely and that no objects which can be drawn in and damage the fan have been left in the installation. If the fan is equipped with steel spring anti-vibration mountings, the transport locking devices must be removed before starting the fan. Belastningsskad Deformations due to overloading ELECTRICAL CONNECTIONS The motor of the fan must always be controlled by a frequency inverter, i.e. either via a separate frequency inverter or with an integral motor. The frequency inverter permits control of the motor speed and slow starts. If the fans are idle for more than 3 months prior to or after installation, the fans should be occasionally rotated by hand at regular intervals. If this is not done, the bearings are liable to become damaged due to overloading as shown in the adjacent illustration. N.B.! The fan must not be started directly on-line! Read the MAX permissible frequency at which the fan motor may be controlled. You ll find this frequency specified on the rating plate. Under no circumstances is it permissible to supply the fan motor with power of a higher frequency.
xxx xxxx xxxxxx xxxx xxxxxxxx xx xxx xxxxx xxxxx xxx xxxx xxxxxx xxx xxxx xxxxxxx xxx xxxx xxxxxxx 3 INSTALLATION OF SEPARATELY SUPPLIED FREQUENCY INVERTER xxx xxxx xxxxxx xxx xxxx xxxxxxxx xx xxx xxxx xxxxx MAX frequency Electric wiring must be carried out by a qualified electrician. Warning! FIf the frequency inverter is not installed correctly, this may damage the motor bearings. FläktGroup s policy stipulates that we agree to accept guarantee liability only if the motor and frequency inverter have been supplied and installed by us. Guarantee liability will not be accepted by FläktGroup if the motor has been connected/ wired to a frequency inverter by another fitter, i.e. one who is not employed by or commissioned by FläktGroup. The cable between the terminal box of the motor and the separate frequency inverter must be shielded. A safety isolating switch must be installed between the mains supply and the frequency inverter. Install the safety isolating switch near the inspection door of the fan. Before beginning work on the fan, isolate the power supply by switching off the safety isolating switch. The EQLK plenum fan can be supplied with an external, factoryfitted frequency inverter, wired to the terminal box of the motor with a shielded cable. A prefitted safety isolating switch prewired to the frequency inverter is also available as an accessory. The EQLK plenum fan can also be supplied with a factory-fitted shielded cable run to an external shielded terminal box. Isolate the power supply and wait until the impeller has stopped rotating (approx. 1 minute) before inspecting and servicing the fan. The frequency inverter and motor shall be installed by a qualified electrician with adequate knowledge on how to install speedcontrolled drive systems (frequency inverters) and EMC safety. The following recommendations shall be regarded as a complement to the manufacturer s installation instructions. If the content of the instructions differ, the instructions furnished by the manufacturer shall have priority over those stated below, to enable compliance with the guarantee liability terms of the manufacturer of the equipment. GENERAL A continuous, shielded 4-wire cable designed for EMC installation to motorized drives should be installed between the motor and the frequency inverter. The optical density of the cable shield shall be at least 80 %, e.g. NCY or Olflex Classic. The shield must be in 360 º contact with the casing both in the motor and in the frequency inverter in order to achieve maximal surface contact. It is not advisable to install a safety isolating switch or junction boxes between the frequency inverter and the motor. MEASURES BEFORE STARTING The fan must not be started with the damper on the suction or delivery side closed. However the fan motor may be briefly energized with the inspection door open for checking that the direction of impeller rotation is correct. Check before starting the fan that the impeller rotates freely and that no objects, which can be drawn in and damage the fan, have been left in the installation. If the fan is equipped with steel spring anti-vibration mountings, the transport locking devices must be removed before starting the fan. Note! The frequency converter have been optimized for the duty point. The power could thus be lower than the motors rated power. FREQUENCY INVERTER The shielded cable must be led either through an EMC approved cable gland in the casing of the frequency inverter or through a cap intended for this purpose. The shielded cable must not be connected to an earth screw.
4 The shield must be in 360º contact with the casing Shield Insulating tape CAPACITIES IN EXCESS OF 22 KW If the capacity exceeds 22 kw, a symmetrically shielded cable with concentric or in some other way symmetrically designed protective earth conductor should be used. For recommendations governing these installations we refer to the installation instructions for the frequency inverter. AIRFLOW MEASUREMENT TO CONNECT THE SHIELDED CABLE If the application requires you to wire the cable shield to an earthscrew inside the motor or the frequency inverter, this must be done in such a way that the impedance will be as low as possible. In these cases the length of this conductor must be restricted to 5 times the width of the conductor. For instance, the length of a 1 cm wide conductor should not exceed 5 cm. Insulating tape MOTOR The cable must be led into the terminal box of the motor through an EMC approved cable gland, e.g. through a Miltronic SKINTOPMS-SC. The shielded cable must only be connected via the EMC cable gland, not to an earth screw. The shield must be in 360º contact with the casing Casing Shield The EQLK has equipment for measuring the airflow. The airflow, q, can be measured by applying a manometer reading of Δp (Pa), and a constant, k, using the following formula: q = 1 Δp m 3 /s k The manometer reading, Δp, which is the difference between the pressure in the suction chamber by the fan inlet and the pressure inside the inlet cone, can be read with a manometer (pressure range of up to 6000 Pa) which should be connected with a 4 mm dia. tube to 2 externally located pressure tappings. The value of the constant k is specified in the table below. OTHER DETAILS In addition to the above, observe the following: type of mains power supply local electrical safety rules and regulations manufacturer s installation instructions for the frequency inverter. For EQLZ-42 U-tube manometers, use only the red manometer fluid supplied with the instrument. Never use any other type of fluid. Precision-adjust the zero point with the zero adjustment screw. A flow indicator with built-in pressure transducer (available as an accessory) should be connected by means of tubes to the external pressure tappings. This instrument converts the manometer pressure reading to a flow (m 3 /s) which is shown on a display screen and transmits a 0 10 V output signal, linear with the flow.
5 If the air handling unit is supplied with a control system, the flow can be read directly in the control panel display. NB! In the case of air handling units supplied with a control system, the pressure tappings in the end connection panels of the unit are not connected to the airflow sensor of the fan. If you still want to read the manometer pressure with an external manometer, you can connect the tubes from the airflow sensor of the fan across T-nipples to the pressure tappings in the end connection panel of the air handling unit. If this external means of measuring flow will not be permanent, the tubes must be restored to their original condition. Size EQLK, EQLT, aaa-b k- factor GPEB 005-2 56.50 025 008-2, 009-2 42.55 028 008-3, 009-3 37.34 031 011-2, 014-2 29.95 035 011-3, 014-3, 018-2, 020-2 22.73 040 018-3, 020-3 18.77 045 023-2, 027-2 15.34 050 023-3, 027-3, 032-2, 036-2 12.18 056 032-3, 036-3, 041-2, 045-2 9.49 063 041-3, 045-3, 050-2, 054-2, 063-2, 072-2 7.50 071 050-3, 054-3, 056-3, 068-2, 063-3, 072-3, 079-2 6.02 080 068-3, 079-3, 090-2 4.60 090 090-3 3.80 100 If two fans are installed in the fan section, the k-value is applicable to the total airflow generated by both fans. TEMPERATURE CORRECTION The flow scale on the indicating instrument and the flow formula above apply to air with a temperature of +20 C. For other temperatures, the flow must be corrected using the following formula: q = q20, m 3 /s (273 + t) 293 where q = the actual flow through the fan, q20 = the flow reading and t = the current temperature in C. MAINTENANCE Warning! In order to prevent personal injury and damage to machinery, the safety isolating switch must be switched off and the safety fuses of the fan must be removed before beginning work on the fan. The fan must be inspected and cleaned every 6/12th month. The length of the interval has been determined on the basis of approx. 2000 hours of operation during a 12-month period and for a normal comfort installation. In environments where the dust content is high in the supply and/or extract air, the air handling unit will have to be inspected and cleanedmore often. The fan is accessible through the inspection door and cleaned with the fan in place. CLEANING Both the supply air and the extract air fan should be inspected and cleaned whenever the need arises. Dust tends to collect mainly on the inner side of the fan blades. The best way to clean the fan impeller is by using a vacuum cleaner equipped with a soft nozzle. Be careful to remove all the impurities from the fan blades so that the fan will not come out of balance. After adjusting or cleaning the fan, check that it runs free of vibration. TO REMOVE THE FAN FROM THE AIR HANDLING UNIT CASING, SIZES 005-090 The fan can be withdrawn from the casing in the following way: 1. Remove the frame of the inspection door including the door and the fixed panel by removing the bolts beneath the cover plenums. 2. Disconnect the motor cable/control cable to the frequency inverter and pull the cables through the rotor wall/filter wall. 3. If a shear absorber is fitted: Remove the bolts (2 bolts) that secure its brackets. Ignore the bolts on the rear side; they need not be backed off. If a pressure suppressor and steel spring anti-vibration mountings are fitted: Remove the bolts to the fan beams in the floor at both ends. 4. If steel spring anti-vibration mountings are fitted: Remove the bolts that hold the fan connection against the fan outlet.
6 5. Withdraw the fan unit. Be careful not to damage the gasket in the fan s inlet plate (applies to rubber antivibration mountings). The fan can be withdrawn maximally so far out that half the fan motor protrudes outside the unit casing without support. 6. Push in and reassemble the components in the reverse order. TO REPLACE THE MOTOR 1. Disconnect the electrical connections. 2. Remove the stop screw in the fan impeller hub. 3. Remove the motor from the motor base plate. 4. Extract the impeller from the motor shaft end with an extractor tool. Utilize the existing extraction grooves in the hub for this purpose. See the figure below. 5. Back the motor from the impeller. 6. Reassemble in the reverse order, using the tapped hole in the motor shaft end as a fixing point for the extractor tool. xxx xxxx xxxxxx xxx xxxx xxxxxxxx xx xxx xxxx xxxxx Locking bolt Carry out maintenance on the motor according to the instructions provided by the motor supplier. In cases where there is no possibility to carry out the entire fan or motor with impeller, alternatively there is no need for a complete disassembly, following procedure can be used: 1. NOTE! Turn off the power at themain switch and mark that work is ongoing in the fan section. 2. Disconnect all electrical connections in themotor terminal box. 3. Remove themotor bracket fromtheir bolted joints at the unit s bottom panel/guide rails. 4. Move themotor bracketwithmotor and impeller from the inlet cone far enough to enable removal of the impeller. 5. Alternatively loose the bolt joint on themotor and rotate the motor to enable removal of the impeller. 6. Remove the impeller fromthemotor shaft using a puller. 7. Lift the impeller out of the unit in a suitableway through the inspectiondoor or disconnect the motor bolted joints if this has not been done and lift themotor out of theunit in an appropriate way through the inspection door. Make sure that the fan inlet engages into the rear holder of the connection frame.