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DEXON CANADA AIR SYSTEMS INC.
BLOWER HEATER OWNERS MANUAL
MDH SERIES
PROVIDING SAFETY VENTILATION TO THE WATER, WASTER WATER INDUSTRY
SINCE 1986
th
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: dexoncan@dexoncanada.com
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Table of Contents
Summary of Contents for Dexon MDH Series
- Page 1 DEXON CANADA AIR SYSTEMS INC. BLOWER HEATER OWNERS MANUAL MDH SERIES PROVIDING SAFETY VENTILATION TO THE WATER, WASTER WATER INDUSTRY SINCE 1986 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: dexoncan@dexoncanada.com...
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Page 2: Table Of Contents
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 CONTENT GENERAL COMMENTS ..............................2 1.1. INTRODUCTION ...............................2 1.2. PURPOSE .................................2 OPERATOR AND EQUIPEMENT SAFETY ........................3 2.1. OPERATOR SAFETY ..............................3 2.2. EQUIPMENT SAFETY ...............................3 CONTROL PRINCIPALS ..............................4 3.1. SEQUENCE OF OPERATIONS ..........................4 FEATURES ……………………………………………………………………………….…………………………….….…..5... -
Page 3: General Comments
1. GENERAL COMMENTS 1.1 INTRODUCTION Dexon blower heaters are CSA Certified and designed to meet the requirements of the Canadian Electrical Code. The MDH series blower heater is suitable for outdoor surface mounting or flanged pipe mounting. FEATURES Overheat Protection ... -
Page 4: Operator And Equipement Safety
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 2. OPERATOR AND EQUIPMENT SAFETY 2.1 OPERATOR SAFETY The installation, operation and maintenance of this unit must be carried out by qualified personnel only and in accordance with national and local electrical codes. -
Page 5: Control Principals
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 3. CONTROL PRINCIPALS 3.1 SEQUENCE OF OPERATION The main PCB inside the unit controls the blower heater functions, the fan and powers the status board. A temperature sensor at the discharge of the unit regulates the heating elements to maintain a preset temperature that is based on airflow requirements and location. -
Page 6: Features
CSA Certified: Dexon blower heaters are CSA certified for Class 1, Div. 2, Gas Groups C & D Locations, Temp. Code T2C and for Ordinary Locations. Any modifications to existing certified units will require special CSA approvals/certification. -
Page 7: Status Indication
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 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 Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 Optional features that can be added to the status board: 1. An optional Alarm Module is available to interface with external alarms or PLC to provide three status output alarms; “Fan Stopped”, “Low Temp.” and “Overheat”. Optional Alarm module sold separately.
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Page 9: Installations
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 4. INSTALLATION 4.1 INSTALLATION REQUIREMENTS Status board must be installed in a suitable enclosure remote from hazardous locations in accordance with local electrical codes. Class 1, Div. 2 units must be fused remote from hazardous locations. -
Page 10: Performance Check
4.3 PERFORMANCE CHECK NOTE: You will require a means of cooling the temperature sensor to check the heating, “Low Temp.” and the “Fan Stopped” functions. We would suggest using ice water or a Dexon Temperature Simulator (sold separately). To create a demand with ice water; remove the temp. sensor from tubing (Fig.1) and place the sensor in the ice water to create a heating demand and then place the sensor directly on ice to lower the temperature to 0°C to create the “Low Temp.”... - Page 11 1. Start the unit and let it run for APPROX. 8-10 minutes to allow the “Low Temp.” override timer to time out. 2. Create a heating demand by placing the temperature sensor in ice water or using the Dexon Temp. Simulator as described above. Once the heat demand has been created the “Element 1”...
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Page 12: Maintenance
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 7. After the override has timed out, remove the created heat demand. If using ice water replace the sensor in the tubing being sure to insert it all the way to the stopper and if using the Temp. - Page 13 Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 e. Clean the fan blades as required and check the general condition of the fan. Check all connections to the fan and control section for loose or damaged wires and ensure they are secure.
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Page 14: Trouble Shooting Guides
3. Check that there is power to the status board and TB7 on the 95DH Main Controller. condition above. If the above recommendations do not solve the problem please contact Dexon Canada Air Systems at 403-930-1284 or email techsupport@dexoncanada.com Page... -
Page 15: Main Control Board - 95Dh
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 6.2 95DH MAIN CONTROL BOARD “Low Temp.” shut down bypass timer Fan Adjustment LED: The LED will blink until the timed Potentiometer. 12VDC output to delay has ended. Note: In order to... - Page 16 - Is the discharge actual temperature as per the temperature sensor located near the bottom of the blower heater in a small aluminum tube (See Dexon 95DH Main Controller for Temperature Sensor Jack). - Is the set point temperature that will be maintained at the blower heater discharge at the bottom of the blower heater.
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Page 17: Status Board - 95Sts
Overheat Sensor test: If the relays are fine check the continuity of the overheat thermostat, it should be in a normally closed state to allow heating. See Dexon 95DH Main Controller page for location of the overheat thermostat wires. Figure 2: “Overheat” Indication... - Page 18 Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 “Power On” LED and “Fan Stopped” LEDs are both lit: Is an indication that there has been a fan failure or if there is confirmation of the fan running then possibly issues with the 95DH Main Controller, status board or TachOP PCB.
- Page 19 Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 “Manual/Auto” Toggle Switch: DO NOT LEAVE UNIT IN MANUAL MODE UNATTENDED This switch is primarily used to purge/flush/ventilate a confined space prior to entry. In “Auto” mode the blower heater runs at a preset level based on the required airflow rate;...
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Page 20: Warranty
7. WARRANTY Limited Warranty Dexon Canada Air Systems Inc. warrants its Blower Heaters and Vent Fans to be free of defects in material and workmanship for a period of one (1) year from start up or eighteen (18) months from shipment, whichever comes first. -
Page 21: Drawings
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 8. DRAWINGS 8.1 DIMENSION DRAWING Page... -
Page 22: Bottom Footprint
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 8.2 BOTTOM FOOTPRINT Page... -
Page 23: Internal Wiring
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 8.3 INTERNAL WIRING Page... -
Page 24: Field Wiring
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 8.4 FIELD WIRING Page... -
Page 25: Optional 95Alm Alarm Module ( If Applicable)
Dexon Canada Air Systems Inc MDH Series Use Manual Version 07.2019 8.5 OPTIONAL 95ALM ALARM MODULE This Alarm Module is equipped with three form C Relays with contacts rated at 2A, 250V for connecting to warning devices such as Automatic Dialing Equipment, Central Monitoring, Audible and /or Visual Alarms etc.
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