Ruks Engineering Ltd. IAQ Systems

Ozone Generators shall be provided with the primary aim of achieving reduction in Volatile Organic Compounds (VOC), hydro carbon gases, and organic odors, in Indoor Environment. They shall also serve purpose of depleting and inhibiting growth and propagation of microbial organisms and microflora, commonly found in indoor environments, HVAC ducts, cooling coils and on air filters. VOC reduction shall be achieved by oxidation of VOC by ozone. Depletion of microbial colonies shall be achieved by inhibiting their growth and propagation.
The aim is to ensure the VOC are kept below the TLV (Threshold Limit Value) for occupied areas, as recommended by OSHA and or AGIH.
The maximum residual concentration of ozone in the indoor environment shall not exceed 50 PPB (v/v). PPB is Parts Per Billion.
Ozone Generators shall be provided where called for, with number of corona discharge plates as listed in the schedules.
Ozone Generators shall be compact, self contained units, with all components factory mounted in one neat, compact package. The 'K' type mounted inside the duct.
Parts of the generators in contact with air stream shall be kept to as minimum as required.
Components in contact with air stream 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.
The generator plates shall be mounted on generator head fabricated out of materials that repel accumulation and formation of sediments by tar, nicotine and grease. This is an extremely important prerequisite to enhance the operational reliability and ease of maintenance of the generator plates.
The generators shall be suitable for mounting on ducts with air flow in horizontal, vertical or angular directions.
The generators shall operate effectively with air flow in either direction, that is left to right or vice versa in horizontal ducts, and top to bottom or vice versa in vertical ducts.
Generators shall be electrically interlocked with motor of the air handling unit fan. This will prevent start of the generator unless the fan motor is energized.
'K' type generators shall be mounted inside the ducts. It shall be provided with flange suitable for mounting on a metal frame, to be installed inside the duct.
Openings in the ducts shall be made with sheet metal shears or cutters. Metal saw or grinding machine shall not be used, except to make an initial cut to permit use of metal shear. This precaution is taken to prevent metal debris from falling into the ducts.
When mounted on the supply air duct, it is absolutely important to ensure the chosen location does not have carry over moisture from cooling coil or humidifier, or any other moisture emitting device.
Care should be taken to ensure the generator is mounted on a straight run of duct with steady flow of air. Installation on bends, elbows, transition pieces, or close to dampers is not recommended.
Air filter (efficiency 80%) shall be provided in the duct to prevent particulate in the air stream from reaching the ozone generator.
Generation of ozone shall be only by principles of corona discharge. Multiple number of corona discharge plates shall be used to provide the necessary quantity of ozone. All the corona discharge plates shall be housed in on common stainless steel enclosure.
Only multiple plate type corona surface shall be used for ozone generation. Production density of ozone per sq inch (or sq cm) of surface area of corona surface shall be as low as possible. Rate of variation of production of ozone shall follow approximately the rate of variation of VOC in the indoor environment. This is in view to ensure residual level of ozone in the indoor environment remains low while ensuring residual VOC level also remains low.
Annular type of corona or corona mounted outside the air stream with ozone tubed to the duct shall not be used.
Ozone and VOC shall be detected in the same gaseous stream, and ozone production shall be in this stream. To ensure this, ozone generator shall be duct mounted type. Portable type and generators that produce ozone outside the HVAC air stream are not acceptable, as they do not meet this criteria.
Use of ionizer, or activated carbon filters is not permitted.
Ozone generators shall not require any consumable for its operation, except for use of electricity.
The system shall not rely on initial or replacement of filters of any sort to remove odors and chemicals.
The ozone generators shall be capable of operating on 110 Volts or 220 to 240 Volts, single phase power supply, 50 or 60 Hz. They shall be properly grounded. Delete voltage not applicable to you.
Ease of maintenance is important consideration. They shall be manufactured to permit easy withdrawals and refitting on the ducts, with minimum use of tools of hardware to remove or refit the generators to the ducts.
Manufacturer shall be Ruks Canada Ltd.

CZ1 - VOC SENSOR, CONTROLLER AND AUTO REGULATION OF OZONE GENERATORS

SENSOR MODULE

Regulation of IAQ device shall be automatically controlled by Ruks ControZone CZ1 system, comprising Auto VOC Sensor and Variable Load Controller.
Sensor and Controller shall be rated for continuous operation.
Sensor Shall be suitable for mounting in space, duct, plenum, or process chamber. If not space mounted, it shall be provided with Air Aspiration enclosure. Sampling air shall be aspirated to the enclosure and released.
The Sensor shall be factory calibrated to Isobutylene gas 100 PPM for full span and controlled clean air for zero span. Factory stamped calibration certificate with date of calibration shall be provided with each Sensor.
The VOC Sensor shall be capable of detecting broad range of commonly occurring VOC in indoor applications. Each gas sensed is related by the sensor to its corresponding concentration value to isobutylene.
The Sensor shall provide 4 distinct signals, one each for Clean, Low, Medium and High levels of concentration of the polluting VOC. The Sensor shall have 5 LED displays to provide visual indicating for the 4 levels, and warm up phase. It shall be possible to field adjust the sensitivity of the sensor.
The sensor shall provide 0 to 10 VDC stepped and 0 to 5 VDC proportional output, field selectable, for interface to Automated Building Management System.
In the event of power failure, or if the system is turned off, the Sensor shall retain the pre set sensitivity.
The sensor shall be provided with potentiometers to adjust the 4 levels of pollution, independent of one another.
The Sensor shall be suitable for operation in air stream of RH 45% to 65%.
Factory supplied interconnecting cable shall be provided, for communication between Sensor and Load Controller.

VARIABLE LOAD CONTROLLER
Controller shall be solid state, mounted in rugged stainless steel enclosure.
It shall be fully factory assembled. Field provided connections shall be limited to power wiring.
The Controller shall be suitable for accepting signals from the Sensor. Based on the signals received, it shall provide variable output to operate IAQ devices.
Input voltage to controller shall be 120 Volts, 1 Ph, 60 Hz or 220 to 240 Volts, 1 Ph, 50 Hz (Factory set). It shall be suitable for load rating of 10 Amps.
Controller shall be provided with terminal block to connect incoming power, variable outgoing power, and for interlock to AHU motor or other air moving device, and to safety device such as high ozone cut out switch.
The Controller shall be provided with receptacle to accept easy plug in cable connector, for communication to Sensor.
Controller shall be provided with 3 Lamps to indicate Power On, Automatic, Manual Bypass.
Controller shall be provided with rocker switch to choose Automatic or Manual Mode of operation. In the Manual Bypass Mode, voltage output of the Controller shall be 100% of input voltage, regardless of the level of VOC.
Cable connector between Controller and Sensor, length not less than 25ft (7.5 M) shall be factory provided (specify length if longer than 25 feet is required). This shall be complete with cables to provide power to Sensor and transfer signals for the different levels of VOC from Sensor to Controller.
The Sensor Controller shall be Ruks ControZone Model CZ1, manufactured by Ruks Canada Ltd.

OZONE CONCENTRATION SENSOR, MONITOR AND CUTOUT SWITCH

Ozone concentration monitor cum sensor shall be provided for the occupied areas. At least one Monitor/Sensor shall be provided for generators in the AHU serving the area.
The monitor shall be installed in a side stream duct and not in the main duct. This is to ensure the sensor element is not exposed to high velocity of air found typically in all HVAC ducts. This ensures accuracy of sensor readings, and prolongs life of the sensor element.
Lowest detection of the monitor shall be down to 20 PPB (v) or 0.02 PPM (v).
Visual display shall be provided on the outer case of the Monitor. This shall comprise series of at least 10 pilot indicating lights, 4 green, 3 yellow and 3 red. When illuminated, they indicate the concentration of ozone in the following order.
1. First green: Always On. Indicates power is ON.
2. Next 3 green lights: Concentration of 20, 30 and 40 PPB respectively.
3. Three yellow lights: Concentration of 50, 70 and 80 PPB respectively.
4. First red light: 100 PPB (Maximum specified by OSHA).
5. Second and third red lights: 120 and 140 PPB respectively.
The sensor, monitor and all components shall be mounted in one neat and compact case, suitable for wall mounting. The indicating lights shall be mounted on the cover of the case. All components shall be factory mounted.
The monitor shall have electrical leads to provide an open contact. In the event concentration of ozone reaches the set alarm value, 'Normally Close' changes to 'Normally Open' position. This will be used to electrically cut out the ozone generator, when concentration reaches the set value.
Additionally, it shall also have an audible alarm which is activated if the concentration reaches the set level. Switch shall be provided on the case of the monitor, to turn off the alarm, at the option of the user.
The alarm shall be factory set at 50 PPB. However, it shall be possible to change this setting in the field to any desired level.
The monitor shall provide a linear 0 to 2 Volts DC output voltage, proportional to concentration of ozone. This will be interfaced with the BMS to record continuously concentration in PPB or PPM, and also to produce hard copy printouts. This will also enable shutting down the ozone generators through the BMS, if the set high level is reached.
The monitor shall be capable of interfacing with BMS. Necessary transponders to enable this will be provided by others.
It shall also be possible to set the high ozone cut out level through the BMS, and to shut down the ozone generators through the BMS, in the event the set alarm level is reached.
The monitor shall be suitable for continuous operation.
Input power source is 24 Volts, DC, provided. Suitable adaptor for this shall be provided with the Monitor.
Manufacturer shall be Ruks Eco Sensors Inc, USA/Canada.