ENERVEX MEC 18 Installation & Operating Manual Download Page 9

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3916010 06.16

4.2 CONTINUOUS FAN OPERATION

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
•  Jump terminals 5 and 9.
•  Jump terminals 6 and 8.
•  Connect the appliance:
  -  Connect the start signal from the appliance to terminals

    14 and 15.
•  Connect the fan:
  -   If using a 1x120V fan, connect it to terminals 19, 20 and

21. Refer Fig. 7 and 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 transducer (XTP) to terminals 22, 23 and 24.

Fig. 7

MEC 18 Control Board

COM Vout Vin

Summary of Contents for MEC 18

Page 1: ...UST CONTROL 3916010 06 16 Installation Operating Manual ENERVEX Inc 1685 Bluegrass Lakes Parkway Alpharetta GA 30004 USA P 770 587 3238 F 770 587 4731 T 800 255 2923 info enervex com www enervex com READ AND SAVE THESE INSTRUCTIONS ...

Page 2: ...nd variable frequency drives are not covered by this manual Please refer to these component s individual manuals 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 you have questions contact the manufacturer at the address or telephone number listed on the front of the manual 2 Before servicing or cle...

Page 3: ...ting of Transducer 7 3 4 Mounting of Duct Probe 7 3 5 Connecting Transducer to Duct Probe 7 4 ELECTRICAL INSTALLATION 4 1 General 8 4 2 Continuous Fan Operation 9 4 3 Intermittent Fan Operation 10 4 4 Connection to a Variable Frequency Drive 12 4 5 Integrated with External PDS 13 5 STARTUP AND CONFIGURATION 5 1 General 14 5 2 Setting Operatuing Pressure 15 6 MAINTENANCE AND TROUBLESHOOTING 6 1 Tro...

Page 4: ...achieved the control releases the appliance for operation and continues to regulate the voltage to the fan or VFD to maintain the specified pressure the value can be viewed in the display In the event of insufficient pressure the control assures the appliance s shuts down after 15 seconds When the appliance shuts down the control turns off the fan The control can be used in one of two ways Interlo...

Page 5: ...tandard Emission EN50 081 1 Immunity EN50 082 2 XTP Sensor Power supply VDC 12 36 Amperage mA 20 Output VDC 0 10 Operating temperature F C 0 to 160 18 to 71 Accuracy 0 08 Dimensions D in mm 3 70 94 E in mm 5 12 130 F in mm 6 18 157 G in mm 3 13 80 Weight lbs kg 6 3 Stack Probe Dimensions H in mm 4 25 108 I in mm 3 50 89 MEC 18 Specifications I A D C E F B G H MEC 18 EXH A U S T C O N T R O L 24V 2...

Page 6: ... cannot be mounted inside an airtight enclosure It uses the atmoshpheric pressure as reference pressure XTP Sensor Max 300 feet 3 2 MOUNTING OF CONTROL 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 hun...

Page 7: ... 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 CONNECTING TRANSDUCER TO DUCT PROBE The transducer XTP is connected to the duct probe via a silicone tub...

Page 8: ...ectrical power before servicing Contact with live electric components can cause shock or death Fig 6 The terminals are connected as shown on Fig 6 24V 24V COM 0 COM 24V 0 10V 0 10V _ _ Terminal Use 1 Power Supply L1 2 Power Supply N 3 Power Supply Ground 4 5 Voltage Input from Appliance thermostat Optocoupler 10 120VAC CDC 6 7 Voltage Input from Appliance thermostat Optocoupler 10 120VAC DC 8 24VD...

Page 9: ...appliance Connect the start signal from the appliance to terminals 14 and 15 Connect the fan If using a 1x120V fan connect it to terminals 19 20 and 21 Refer Fig 7 and 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 transducer XTP to terminals 22 23 and 24...

Page 10: ... terminals 5 and 14 The start signal to the appliance is now activated by terminal 15 Connect Neutral to terminal 6 Connect the fan If using a 1x120V fan connect the fan to terminals 19 20 and 21 Make sure the neutral line is dedicated to the fan and control term 20 only 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 ...

Page 11: ...als 4 and 9 Connect the start signal to the appliance to terminals 14 and 15 Connect the fan 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 transducer XTP to terminals ...

Page 12: ...riable 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 Wire the VLT Micro Drive variable frequency drive according to Fig 11 Fig 10 Fig 11 25 26 29 25 26 ...

Page 13: ...e Switch PDS to the MEC 18 The external PDS is a backup to the integrated PDS and both must be satisfied by sufficient pressure to release the appliance Remove the factory installed jumper over terminals 16 and 18 Connect the switch to terminals 16 17 and 18 as shown in Fig 12 Fig 12 MEC 18 Control Board ...

Page 14: ...ess to the dipswitches see Fig 13 A 1 Remove the potentiometer dial 2 Remove the 4 flathead screws and lift the top plate off the board 3 Change the dipswitch settings DIP SWITCH NAME OFF ON 1 MANUAL RESET Automatic reset at power failure or insufficient pressure Manual reset at power failure or insufficient pressure 2 POST PURGE No post purge 3 minutes of post purge 3 PDS CHECK No monitoring to s...

Page 15: ...on use the potentiometer Fig 14 B to set the required pressure in WC Pa on the display Fig 14 C Release the set point button the actual pressure will now show up on the display 2 Start the heating system and wait until the thermostat Fig 15 A closes and the pressure has stabilized none of the yellow diodes are lit Final adjustment of the pressure 3 Check the pressure at the appliance outlets and m...

Page 16: ...ation Constant light in ALARM diode Fig 16 H but no light in FAN diode Fig 16 G Can only occur when MANUAL RESET is ON Fig 16 F Power outage Press the RESET button Fig 16 C for 1 second see warning Constant light in Alarm diode and light in fan diode Fig 16 H Insufficient pressure 1 Press the RESET button Fig 16 C see warning 2 Check that the service disconnect switch is working properly 3 Check t...

Page 17: ...17 3916010 06 16 ...

Page 18: ...ENERVEX Inc 1685 Bluegrass Lakes Parkway Alpharetta GA 30004 USA P 770 587 3238 F 770 587 4731 T 800 255 2923 info enervex com www enervex com 3916010 06 16 ...

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