Dexon OWMDH Series Owner'S Manual Download Page 1

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DEXON CANADA AIR SYSTEMS INC.

Dexon Canada Air Systems Inc., 5018 80

Ave, SE, Calgary AB T2C 2X3,

www.dexoncanada.com

Phone: 403-272-0562, Fax: 403-235-0149, Email: [email protected]

BLOWER HEATER OWNERS MANUAL

OWMDH SERIES

PROVIDING SAFETY VENTILATION TO THE WATER, WASTER WATER INDUSTRY

SINCE 1986

Summary of Contents for OWMDH Series

Page 1: ...ystems Inc 5018 80th Ave SE Calgary AB T2C 2X3 www dexoncanada com Phone 403 272 0562 Fax 403 235 0149 Email dexoncan dexoncanada com BLOWER HEATER OWNERS MANUAL OWMDH SERIES PROVIDING SAFETY VENTILATION TO THE WATER WASTER WATER INDUSTRY SINCE 1986 ...

Page 2: ...INSTALLATION REQUIREMENTS 8 4 2 INSTALLATION INSTRUCTIONS 8 9 4 3 PERFORMANCE CHECK 9 10 11 5 MAINTENANCE 11 5 1 MAINTENANCE INSTRUCTIONS 11 12 6 TROUBLE SHOOTING GUIDES 13 6 1 TROUBLE SHOOTING GUIDE 13 6 2 MAIN CONTROL BOARD 95DH 14 15 6 3 STATUS BOARD 95STS 16 17 18 7 WARRANTY 19 8 DRAWINGS 20 8 1 DIMENSIONS 20 8 2 BOTTOM FOOTPRIN 21 8 3 INTERNAL WIRING 22 8 4 FIELD WIRING 23 8 5 OPTIONAL 95ALM ...

Page 3: ...with an adjustable 5 range If the discharge temperature drops below 0 C typically the blower heater will shut down to prevent the ventilated space from freezing This equipment is suitable for use in Class 1 Division 2 Gas Groups C and D Temp Code T2C or for Non Hazardous Locations only FEATURES Overheat Protection Low Temperature Shut Down Discharge Temperature Sensor Adjustable Fan Speed in Auto ...

Page 4: ...e protection When installing servicing ensure all latches are used to secure the door We do not recommend installing on a down pipe smaller than the discharge outlet Ensure there is adequate distance between intake louvers and pressure relief vent gooseneck Follow regular maintenance procedures as outlined in section 5 1 of this manual Locations with higher debris accumulation such as vegetation c...

Page 5: ... restart when the discharge temperature reaches 2 C typically or more A built in timer overrides this shut down for 7 8 minutes when the unit is manually reset or power is cycled to allow the elements to warm up the discharge temperature This override does not apply when the unit automatically restarts after a Low Temp shut down If the discharge temperature rises above the normal operating range t...

Page 6: ...odule is included Staged Heating Staged heating is only provided for the larger SMDH IMDH WMDH OWMDH series and the SRVDH IRVDH WRVDH OWRVDH series blower heaters to prevent high current draw and reduce power consumption when not required Stage 2 and Stage 3 heating elements will only be used if Stage 1 is not able to maintain the preset discharge temperature setting and only as required to mainta...

Page 7: ...eat demand and the LED can be either blinking or constant Element 2 3 indicate stage 2 or 3 are required to maintain the desired temperature These LEDs will not blink they will remain constant WARNING The remote manual mode interface feature is intended to temporarily turn on Manual mode full fan speed for added safety regardless of the position of the Auto Manual toggle switch on the status board...

Page 8: ...status output alarms Fan Stopped Low Temp and Overheat Optional Alarm Module sold separately 2 A Manual Mode Interface Terminal is available for input from PLC Lid Switch etc dry contact to initiate Manual mode full fan speed Standard Cable length 3 meters with the status board and 8 meters with the blower heater unless requested otherwise Please see status board Trouble Shooting Guide for more in...

Page 9: ...gram provided allowing enough space between the ground and the unit for ducting transitions or off sets Through wall lining and insulation supplied by others and installed by others as required 2 The unit may be secured to the wall with the four wall mount brackets supplied 3 If not pre mounted install the status board in a suitable enclosure in a non hazardous dry location 4 Run separate conduits...

Page 10: ...approx 7 8 minutes See Trouble Shooting Guide 6 1 for more information This allows the blower heater to start in cold conditions and will occur every time the unit is reset or powered up 9 If there is a heat demand the Element 1 LED on the status board should light up and should only remain constant momentarily then blink as it meets the demand The element LED will go out every time the demand is ...

Page 11: ...ondition as described above with ice water or with the Dexon Temp Simulator to drop the discharge temperature to 0 C The Low Temp LED should light up and the fan should shut down followed by a Fan Stopped indication 4 After the unit has shut down turn the fan switch on the status board to Manual this overrides the Low Temp shut down feature The fan will come on at full speed and the Fan Stopped LE...

Page 12: ...RUCTIONS MAINTENANCE SHOULD ONLY BE PERFORMED BY QUALIFIED PERSONNEL ONCE A YEAR PREFERABLY BEFORE THE COLD WEATHER SETS IN PERFORM THE FOLLOWING MAINTENANCE PROCEDURES 1 Check the status board for the following indications a The Power On LED should be on b The fan switch should be in Auto mode c The Element 1 LED may be off steady on or blinking An off LED would indicate there is no heat demand a...

Page 13: ...r corrosion and ensure they are secure c Ensure the temperature sensor is inserted all the way to the bottom of the tubing 4 Replace any damaged or corroded parts When complete reinstall the control section and reconnect all wiring 5 Power up the unit and complete the performance check as described under section 4 3 6 Ensure all conduit holes are completely sealed with duct seal and secure door wi...

Page 14: ... elements and on the Heat Sink above the elements for damage 3 Ensure the unit is not in Manual mode 4 Check that the fan voltage is set as per specifications see quality control test report 5 Check if the Overheat LED is on 1 Restore power 2 Replace damaged Klixon thermostat s if required 3 Set to Auto and press Reset switch 4 Adjust as required 5 If on see Overheat LED below Overheat LED is on 1...

Page 15: ...om 120Volt Power 120VAC should be present here Low Temp shut down bypass timer LED The LED will blink until the timed delay has ended Note In order to allow time for the heat sensor to reach its set point temperature a 7 8 minute bypass is built into the controller for cold starts If the discharge temperature is below 0 C and the set point is not reached in the allotted time the blower heater will...

Page 16: ...any adjustments to any potentiometers Note the airflow in Auto mode is preset by Dexon based on airflow requirements and heating capacity Increasing the airflow should only be done if airflow is inadequate due to unforeseen on site piping ducting friction Adjustments should only be made when absolutely necessary and by qualified personnel SP2 Is the set point at which the stage 2 element will enga...

Page 17: ...g the pre set discharge temperature Please Note Element 2 and Element 3 LEDs will only be active when stage 1 cannot maintain the preset discharge temperature on its own and stage 2 and or stage 3 elements are required These LEDs will not blink pulse Overheat LED When lit indicates that an Overheat condition has occurred This condition may be the result of either the Crydom Solid State Relay faili...

Page 18: ...at temperatures below 0 C The Low Temp LED can light up due to a lack of heating the heating circuit is off or one or more heat sensors are open This is most commonly due to corroded wire leads in the heat exchanger It could also be caused by a temperature sensor failure a sensor out of calibration or the 95DH main controller has failed The Fan Stopped LED Will light up in the event of a fan failu...

Page 19: ...rflow rate It is important to note that in Manual mode the Low Temp shut down feature is bypassed disabled to ensure the unit does not shut down while the confined space is occupied This bypass can be used to allow heating even in a Low Temp shut down in order to defrost the fan if frosted up The fan will often restart once thawed Reset Switch This switch is used in order to start a bypass timer b...

Page 20: ...revent any gases from entering the inside of the unit This includes ducting discharge conduit and bolt holes or any holes that would allow air to migrate into the unit When removing the inside panels for repair or service the discharge duct and any holes must still be covered in such a way as to prevent moisture from entering the body of the Blower Heater or Vent Fan Dexon s sole obligation under ...

Page 21: ...Dexon Canada Air Systems Inc OWMDH Series Use Manual Version 07 2019 Page 20 8 1 DIMENSION DRAWING 8 DRAWINGS ...

Page 22: ...Dexon Canada Air Systems Inc OWMDH Series Use Manual Version 07 2019 Page 21 8 2 BOTTOM FOOTPRINT ...

Page 23: ...Dexon Canada Air Systems Inc OWMDH Series Use Manual Version 07 2019 Page 22 8 3 INTERNAL WIRING ...

Page 24: ...Dexon Canada Air Systems Inc OWMDH Series Use Manual Version 07 2019 Page 23 8 4 FIELD WIRING ...

Page 25: ...MM BACK VIEW NTS 114 0 MM NC SIX PIN CONNECTOR MOUNTING HOLES RELAY NO F S RELAY NC C NO C L T RELAY O H NO C NC 46 0 MM SHOWN IN DE ENERGIZED STATE NOTE ALL RELAYS AND CONTACTS ARE CONNECTIONS FOR A COMMON ALARM OUTPUT USING NO BACK VIEW NTS 114 0 MM RELAY F S HOLES MOUNTING CONNECTOR SIX PIN NC NO C L SHOWN IN DE ENERGIZED STATE NOTE ALL RELAYS AND CONTACTS ARE CONNECTIONS FOR SEPARATE ALARM OUT...

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