MEC 18 Mechanical Exhaust Control
16Pages

Installation & Operating Manual MEC 18 Mechanical Exhaust Control Job Name: Installer: Installation Date: READ AND SAVE THESE INSTRUCTIONS! ENERVEX Inc. 1685 Bluegrass Lakes Pkwy. Alpharetta, GA 30004 VENTING DESIGN SOLUTIONS

Symbol Legend: The following terms are used throughout this manual to bring attention to the presence of potential hazards or to important information concerning the product. Danger: Indicates an imminent hazardous situation which, if not avoided, will result in death, serious injury or substantial property damage. Caution: Indicates an imminent hazardous situation which, if not avoided, may result in personal injury or property damage. TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK OR INJURY TO PERSONS, OBSERVE THE FOLLOWING: 1. Use this unit in the manner intended by the manufacturer. If...

The EXHAUSTO MEC 18 is a Mechanical Exhaust Control used to monitor and maintain a constant pressure in a duct system. This is achieved by modulating the speed of a fan or ventilator. The MEC 18 can be used with EXHAUSTO Models EFH, RSV, BESB and BESF. It can control the fan speed directly or via a Variable Frequency Drive (VFD). It is a component in the MDVS, Mechanical Dryer Venting SystemTM and the MBES, Modulating Building Exhaust SystemTM. The MEC 18 is typically used to control the pressure in duct systems serving clothes dryers, bathrooms, kitchen hoods and other building venting...

2.1 Dimensions & Capacities MEC 18 Control Power supply Amperage Operating temperature Range of operation Tolerance Output Current Max. Load Output V A °F/°C inWC/Pa inWC/Pa mA VAC VDC A in/mm B in/mm C in/mm lbs/kg Emission Immunity Weight EMC standard XTP-sensor Power supply Amperage Output Operating temperature Accuracy Dimensions VDC mA VDC °F/°C D in/mm E in/mm F in/mm G in/mm lbs/kg H in/mm I in/mm Weight Duct Probe Dimensions EXHAUST CONTROL VENTING DESIGN SOLUTIONS Fig. 1-A Fuse holder Fig. 1-B Alarm-red LED Fig. 1-C Reset button Fig. 1-D Set point button Fig. 1-E Potentiometer for...

3. Mechanical Installation 3.1 Location The control and transducer must be installed indoors. The control does not need to be installed in an enclosure. See Fig. 2 for component connections. The transducer cannot be mounted inside an airtight enclosure. It uses the atmospheric pressure as reference pressure. The control can be mounted directly to a wall or similar. Remove the cover. The mounting holes are located under the plastic screws that hold the cover in place. See Fig. 3. The distance between the control and the transducer should not exceed three hundred (300) feet. EXHAUST CONTROL...

Attention must be paid to the location of the transducer. The transducer can be mounted in any orientation but prefer- ably with the pressur eports facing down. The transducer should be mounted within six (6) feet of the duct probe. 3.4 Mounting of Duct Probe The probe (Fig. 2a on page 5) is inserted into the duct or vent at a point where the pressure is kept constant. This could be at the appliance outlet, in the common duct or similar. Make sure the tip of the tube is flush with the inner wall of the duct. Protrusion into the duct may affect the reading and thereby the operation. 3.5...

Danger: Turn off electrical power before servicing. Contact with live electric components can cause shock or death. MEC 18 is designed for a 1x120VAC power supply only. Fan output is regulated on the neutral side and cannot be connected to other circuits. The control can be used in one of two ways: • Interlocked with an appliance so the appliance operation indirectly controls the fan operation (see Chapter 4.2). NOTE: This option is not available when used with a VFD. • Connected so the fan runs continuously independent of appliance operation (see Chapter 4.3). In both cases, the control...

For continuous fan operation, connect the fan to the control as described below. • Connect a 1x120 VAC power supply to terminals 1, 2 and 3. - Connect the start signal from the appliance to terminals 14 and 15. - If using a 1x120V fan, connect it to terminals 19, 20 and 21. Refer Fig. 7 and the fan's Installation - If using a 3-phase fan and VFD, connect the VFD to terminals 25 and 26 as shown in Fig. 10 and 11. DO NOT connect the fan directly to the MEC 18 control. • Connect the transducer (XTP2) to terminals 22, 23 and 24. Sample Wiring Diagram - Appliance Interlock Connection to 120V Fan...

The control can be set up for intermittent operation in one of two ways: It can be interlocked directly with the appliance control or with a dry set of contacts. Interlock with Appliance Fig. 8 shows how an appliance control signal (10-120V AC/DC) is connected to the MEC 18: • Connect the power supply to terminals 1, 2 and 3. - Connect the appliance start signal to terminal 4. - The start signal to the appliance is now activated by terminal 15. - Connect Neutral to terminal 6. - If using a 1x120V fan, connect the fan to terminals 19, 20 and 21. Make sure the neutral line is dedicated to the...

Interlock with dry set of contacts Fig. 9 shows how a dry set of contacts is connected to the MEC 18: • Connect the power supply to terminals 1, 2 and 3. - Connect the dry set of contacts to terminals 6 and 8. - Connect the start signal to the appliance to terminals 14 and 15. - If using a 1x120V fan, connect the ventilator or fan to terminals 19, 20 and 21. Refer to the fan's Installation Manual. - If using a 3-phase fan and VFD, connect the VFD to terminals 25 and 26 as shown in Fig. 10 and 11. DO NOT connect the fan directly to the MEC 18 control. • Connect the XTP2 transducer to...

4.4 Connection to a Variable Frequency Drive To connect the 3-phase fan and variable frequency drive (VFD), connect the VFD to terminals 25 and 26 of the MEC 18. DO NOT connect the fan directly to the control. Wire the ABB ACS320 series variable frequency drive according to Fig. 10. POWER SUPPLY Wire the VLT Micro Drive variable frequency drive according to Fig. 11. POWER SUPPLY VENTING DESIGN SOLUTIONS S&ssd