Summary of Contents for Swiss Rotors SFC
- Page 1 SFC E NERGY ECOVERY HEELS PERATIONS AND AINTENANCE NSTRUCTIONS SFC Energy Recovery Wheels / OMI Ver. 2024-01-11 EN Page 1 of 21...
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Page 2: Table Of Contents
Opearations in frosting conditions ............................20 7.3.1 ERW speed reduction ............................20 7.3.2 Fresh air preheat ..............................21 7.3.3 Other ice building prevention or de-icing methodes ..................21 Support ....................................21 SFC Energy Recovery Wheels / OMI Ver. 2024-01-11 EN Page 2 of 21... -
Page 3: Introduction
This OMI concerns the SFC range of 4 inches thick (100 mm) Energy Recovery Wheels (ERW) manufactured by Swiss Rotors. The general layout of the SFC ERW with parts descriptions is shown on Figure 1. The heat recovery wheel itself is supported by the housing made of galvanized steel profiles. - Page 4 Figure 1 – Design of SFC Heat Recovery Wheels SIZES The range of SFC ERWs consist of 11 sizes, covering the mainstream of commonly applied wheels. Available sizes are given in Figure 1 and Table 1. Figure 2 - Dimensions of SFC ERW SFC Energy Recovery Wheels / OMI Ver.
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Page 5: Supported Airflow Ranges
14,73 16,40 FPM (4,5 5,0 m/s) Sizes and airflow ranges of the SFC ERW range is given in Figure 3 Table 3 and Figure 4. Each size of the SFC ERW wheel corresponds to the wheel diameter expressed in inches (Figure 3). - Page 6 Program. Basic performance specification of the SFC ERWs including sensible, latent and total heat recovery efficiency and the air pressure drop at given air face velocity is shown in Table 4 and Figure 5. This data is based on performance test results ran in the accredited testing labs.
- Page 7 While configuring the Energy Recovery Wheel, put special attention to place the motor on the supply air part, downstream the wheel itself, as shown on Figure 6. Figure 6 - Motor assembly installed on AHU supply deck, downstream the Wheel itself SFC Energy Recovery Wheels / OMI Ver. 2024-01-11 EN Page 7 of 21...
- Page 8 The SFC wheel may be installed and run in vertical arrangements (V##) upto size SFC-52. Details about allowed arrangements of SFC ERW is given in Table 6. Table 6 - Allowed Horizontal (H##) and Vertivel (V##) arangements of SFC ERW...
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Page 9: Transportation
Due to the specificity of the design, SFC wheels should be transported in a vertical position. Strong inclination of the SFC ERW during transport as well as exposing it to rapid acceleration may damage its key elements responsible for proper operation. -
Page 10: Installation
SFK HRS drive unit (pulley, belt, etc.). • When installing the SFC ERW in the AHU/RTU mind to secure proper ventilation to the drive motor. The air inlet grill of the motor must be clear of any objects which might limit its proper ventilation. -
Page 11: Drive Units General Specifications
4.2.2 DRIVE UNITS GENERAL SPECIFICATIONS General specification of SFC ERW drive units is given in Table 7. Drives listed in Table 7 are capable to run in On-Off mode as well as can be controlled by VFD (smooth revolutions adjustment). -
Page 12: Power Supply Systems
The SFC ERW may be equipped with optional purge sector, which (if applied) will substituted of the of the brush rail as shown on Figure 12. If you plan to install the purge section on the SFC ERW go to chapter 4.4 of this OMI first. -
Page 13: Side Brushes
Figure 14. Figure 14 - Side Brushes Installation PURGE SECTOR The purge sector is an optional part of the SFC ERW assembly, supporting a self-cleaning of the wheel as well as reducing the cross-contamination effect. 4.4.1 INSTALLATION OF THE PURGE SECTOR Untighten screws holding the factory installed brush rail on the horizontal supporting beam and remove it (Figure 15). - Page 14 Figure 17 - Purge sector, brush rail and side brushes installed over the wheel supporting beam Side brushes Figure 18 - Purge sector, brush rail and side brushes installed under the wheel supporting beam SFC Energy Recovery Wheels / OMI Ver. 2024-01-11 EN Page 14 of 21...
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Page 15: Placement Of The Purge Sector
4.4.2 PLACEMENT OF THE PURGE SECTOR The purge sector has to be placed in a right position depending on the SFC ERW configuration, like: • AHU/RTU supply/return deck arrangement • Direction of the wheel spin • Inspection side of the AHU/RTU. -
Page 16: Start-Up
5 START-UP It is recommended to make a first run of the SFC ERW before installing it in the AHU/RTU. This will make it much easier to conduct a thorough inspection of the entire unit and spot any defects before installation. Refer to the Motor electrical connection chapter of this OMI. -
Page 17: Maintenance
DO NOT touch any moving parts – risk of being caught in rotating parts (wheel, drive unit, belt). Use protective gloves to prevent injuries. PERIODICAL CHECK Perform periodical check of key parts of the SFC ERW, according to Table 10 and in time intervals no longer than given in Table 11. Table 10 - Periodical Inspection Checklist... - Page 18 DRIVE LINK BELT SFC ERWs use a link belt to transmit the mechanical power from the drive assembly to the wheel. Due to its design, the link belt may expand during normal operating conditions, therefore periodical adjustment to its length may be required.
- Page 19 Purge sectors are maintenance-free but their condition, rigidness and cleanliness must be checked every year. Pay attention to the distance of the sector against the recovery wheel matrix. Use compressed air to clean if required. SFC Energy Recovery Wheels / OMI Ver. 2024-01-11 EN...
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Page 20: Opearations In Frosting Conditions
In the following paragraphs, typical methods of ice build prevention or de-icing are listed. 7.3.1 ERW SPEED REDUCTION Ice build prevention by SFC ERW speed reduction requires application of Variable Speed Drive (VFD) in the power line of the wheel drive. -
Page 21: Fresh Air Preheat
7.3.2 FRESH AIR PREHEAT Outside air pre-heater installed upstream the wheel in the enables to keep the fresh air heeding the SFC ERW at minimum temperature enabling its normal operations (as described in chapter 7.1 of this OMI). Application of the pre-heater (usually electric) is recommended for AHUs/RTUs running in climate zones where severely low temperatures of outdoor air occur for long time within a year.
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