1. Ozone Generator shall be self contained unit, with all components factory assembled in one neat, compact package, suitable for duct mounting

2. Components in contact with air shall be enclosed in stainless steel casing 18 G thick with sufficient stamped integral openings to allow adequate flow of air over the corona discharge plates

3. Method of ozone production shall be by principle of corona discharge, with multiple numbers of double sided corona plates. Production density of ozone per unit surface area of corona surface shall be very low. Ozone shall be produced from the supply air of AHU/Fan. Air pressure over the corona surface shall not exceed air pressure in the duct. Electrical frequency applied on corona plates shall be the same as line frequency (60 Hz or 50 Hz). All corona plates shall be housed in a common stainless steel enclosure.

4. Detection/Sensing of VOC and production of ozone shall be in the same gaseous medium

5. Corona plates shall be mounted on generator head, specially manufactured to close tolerance, of material that repels accumulation of sediments from tar, nicotine and grease

6. The Transformer shall be electrical induction type. Solid state voltage converter shall not be acceptable. The Transformer shall be Cross Ferro Magnetic Type. Secondary windings shall not burn, generate smoke, or elevate greater than 90ºF (32ºC), even if the high voltage secondary output is short circuited for extended period of time, in full load conditions. Upon removal of the short circuit, the transformer shall revert to normal operation without any damage or loss of efficiency, or reduced insulation capacity, or blow out of fuse, or trip of circuit breaker.

7. The transformer shall be fully encapsulated. The encapsulation is to ensure the transformer windings and core are fully impregnated with epoxy rated for use in electrical equipment. The epoxy shall penetrate into various layers of primary and secondary windings, and into the various sections of the core. This is to ensure electrical spark, if any, shall be contained and isolated within the specific spot of occurrence in the windings, and temperature elevation if any shall be contained and isolated within the specific spot of occurrence of the winding or in the layers of the core. The epoxy for encapsulation shall be fire rated to UL94V0. The electrical properties of the epoxy for this encapsulation shall be ;

a. Dielectric strength at 23ºC not less than 425 volt/mil
b. Voltage resistivity at 23ºC not less than 2 x 1015 Ohm Cm

8. The encapsulation of the transformer shall be done in a one piece die cast metallic enclosure 18 G CRS. The top cover shall be riveted with a fire rated epoxy to UL 94V0. This shall ensure the transformer is completely fire rated and non flammable.

9. The metallic enclosure and encapsulation shall also render the transformer totally safe to operate even if there is settlement and deposition of moisture or water on the transformer due to carry over moisture from Cooling Coil. The transformer shall not burn, short circuit or be damaged, even if fully immersed in water.

These are essential safety prerequisites as the Transformer/Generator is installed in the Air Conditioning Duct, and the facility houses human occupants.

10. Entire Transformer shall be Tested to UL2043: Fire Test for Fire & Visible Smoke Release for Discreet Products & Accessories Installed in Air Handling Space, and Recognized to UL506: Safety Specialty Transformer.

11. Penetration of high voltage conductor from Transformer Enclosure to Corona Enclosure shall be through Embedded Porcelain SS Solid Transmitter. Cable insulation, rubber, synthetic or ceramic bushing shall not be used as reliable insulation for enclosure penetration of high voltage.

12. Primary of Transformer shall be rated for input voltage varying from 0 to 110V (0 to 220V)

13. High voltage electrical wire from the transformer secondary terminal to Porcelain Embedded Transmitter, and further from Transmitter to Corona contact plates shall be rated for 20KV, 150ºC, certified to be ozone and corona resistant, have high flexibility, and shall be silicone insulated. Wire diameter shall not be less than 18 AWG. The wire shall be rated to UL3239 and VW-1 Flame Test. These shall be stamped on the wire. This is essential and cannot be waived from safety standpoint, as this wire carries high voltage.

14. At client’s request, pre shipment inspection and testing of the equipment shall be provided to the user or to the consultant, and or his authorized representative at the manufacturer’s facility. Besides the normal tests, following tests are mandatory;

a. Transformer secondary output, under full voltage and load will be subject to short circuit continuously for minimum of 24 hours. The primary and secondary windings shall not burn nor elevate in temperature greater than 90ºF (32ºC).
b. Upon release of the short circuit, the transformer shall revert to normal operation without any change or modification or repair, or fuse blow out, or trip of circuit breaker.
c. Demonstrate safe and undamaged operation of the transformer at full secondary voltage and load, with transformer fully immersed in a tank of water.
d. At inspectors instructions, cut open a transformer through the windings and core to demonstrate the penetration of the encapsulation epoxy into various layers of primary and secondary windings, and into the core.
e. Demonstrate that high voltage wire is stamped with ratings of voltage to 20KV, temperature to 150ºC, and UL rating 3239 and UL VW-1.

15. The generator shall be suitable for mounting in duct with airflow in horizontal or vertical or angular direction, and for air flow in either direction, right to left, or top to bottom, or vice versa

16. The generator shall have the feature for interlock to motor of the AHU, to prevent start of the generator unless the fan is energized

17. Each and every part and component of the generator including bushing, grommet, corona plate, standoff, paint, and ink in printing labels, shall be fire resistant, and individually listed to UL standards.

18. All parts and components, bonding compound, bushing, standoff, paint, and screen printing ink shall be individually listed to highest UL standards.

19. The generator shall be provided with stainless steel flange in either side to enable mounting to metal frame, to be installed inside the duct

20. Ozone Generator shall be manufactured to permit easy withdrawals and refitting in duct with minimum use of tools or hardware to refit the generator to duct

21. Generator output shall be suitable for modulation by automatic or manual controls

22. The generator shall be rated for operation on 0 to 100 % RH

23. The generator shall be suitable for operation on electrical supply 220 to 240 (110 – 220) Volts, Single Phase, 50/60 Hz 3 wire system.

24. The Generator shall be Classified to UL 1995 ABQK and Tested and Certified for Safety against Fire and Smoke to UL 2043. It shall be CE Certified.