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Phason 

Natural Ventilation Control 

33440000  

Becoming familiar with the NVC 

 

 

Main display 

The main display shows the temperature and any alarm messages. The main display is what you see 
when you are not in a menu or settings display. 

Here are some things to know about the main display. 

 

When a relay is on, the status LED for that relay is lit. 

 

When there is an alarm condition, the display flashes between the alarm message and the current 
temperature. For more information about alarms, read 

Alarm settings and conditions

 on page 

13. 

 

When the control is in manual override mode: 

 

For the curtain

, the 

Open 

and 

Close 

LEDs will blink three times and then stay off  for one 

second. 

 

For the heater

, if  the heater is ON, the 

Heat 

LED will blink three times and then stay ON 

for one second; if  the heater is OFF, the LED will blink three times and then stay OFF for 
one second. 

For more information, read 

Using manual override mode

 on page 16 

 

 

Down 

 

Scroll down 

 

Decrease a value 

Up  

 

Scroll up 

 

Increase a value 

Select 

 

Select an option  

 

Accept a value 

Back 

 

Go back 

Cancel changes 

Alarm LED

  Shows when there is an alarm condition

Test LED 

  Shows when test mode is active 

Version LED 

  Shows the firmware version 

 

Programming LEDs  

 

Show which setting is being 

 displayed 

or 

programmed 

Status LEDs  

 

Show the status of the relays 

 

Show which relay is being 

 controlled 

Programming LEDs  

 

Show which setting is being 
displayed or programmed 

Summary of Contents for NVC-2-12

Page 1: ...tion the NV or closes the temperature ature is below er on ature is abov er off e s 21 7 iew 13 11 ion 11 5 3 nnection 6 10 rview 9 18 Contro NVC is a fu our curtain o ature in a roo grammed sett ered...

Page 2: ...is w temperature one close odel NVC 2 1 odel NVC 2 24 A at 30 VDC A at 120 23 2 HP at 120 4 A at 125 VA 2 A at 125 VA any equipme s For more e A F F P M P T 5 R R w L 2 12 VDC 4 24 VDC C 30 VAC resis...

Page 3: ...nd Close LEDs will blink three times and then stay off for one second For the heater if the heater is ON the Heat LED will blink three times and then stay ON for one second if the heater is OFF the LE...

Page 4: ...oma Select automa Switch the ala Adjust the tes Restore the fa Display the fir Update the firm Adjust the cur Adjust the cur Adjust the ope Adjust the clo Adjust the clo Adjust the Idle Adjust the hea...

Page 5: ...t a curta n page 6 heater or furna ater on page 6 battery cable to on read Connec nnect the tempe e ribbon cable f n external alarm page 7 nal Rain Sensor memory stick to age 19 5 6 4 ain machine to t...

Page 6: ...s the cu a being more s fired fur s shown in th es using hot on their name urnace man Gas fired fu Make sure y ol front cover a using the fo rner of the b hine equipment c times referre urtain to let...

Page 7: ...rm system An alarm system can be a siren an alarm panel or an auto dialer See your alarm siren s installation guide for installation instructions and information about the type of system The descripti...

Page 8: ...ON the power until you have finished all wiring and verified all equipment is properly connected and free of obstructions Finishing the installation 1 Make sure all wires are properly connected to the...

Page 9: ...olds its position during the close cycle Curtains hold their position while the temperature is within the Idle band of the Set point For example if the Set point is 80 F and the Idle band is 4 F 2 the...

Page 10: ...t The current setting in seconds displays and the On duration LED flashes 3 Press Up or Down to adjust the setting and then press Select The change is saved and the display shows 0 on 4 Press Down to...

Page 11: ...nge is saved and the display shows C on 4 Press Down to move to the Close off duration or Back to cancel and return to the main display To program the Close off duration Default 120 seconds range 1 to...

Page 12: ...own to move to the High alarm or Back to cancel and return to the main display How hysteresis works Hysteresis is the number of degrees above the set point that a heating stage or relay switches off F...

Page 13: ...open When there is a probe damage or probe short condition the control switches all relays off Alarm messages Message and description Possible cause Possible solution Hi High temperature alarm The am...

Page 14: ...LoaL 4 Press Down to move to the Hysteresis or Back to cancel and return to the main display Changing the temperature units The NVC can display temperatures in Fahrenheit or Celsius The default is Fa...

Page 15: ...lays operate according to their settings and the test temperature This gives you an idea of how your system performs over a full range of temperatures The relays remain operating according to the test...

Page 16: ...n override mode For the curtain the Open and Close LEDs will blink three times and then stay off for one second For the heater if the heater is ON the Heat LED will blink three times and then stay ON...

Page 17: ...4 Press Select The display shows Curt or heat depending which item you chose in step 1 5 Press Up or Down to select a different menu item or press Back to return the main display To override the heate...

Page 18: ...lts If for some reason the power on method does not work use the power off method To restore the factory defaults using the POWER ON method 1 Press Up or Down until the display shows test 2 Press Sele...

Page 19: ...need is a USB memory stick and a firmware update file You can update the firmware using one of two methods the power on method or the power off method The power on method is the easiest way to update...

Page 20: ...d then the main temperature display 10 When finished remove the USB drive verify the ribbon cable is properly connected and then fasten the cover to the base To update the firmware using the POWER OFF...

Page 21: ...wiring The display shows unusually high or low temperature The probe is not a Phason probe Remove the probe and then install a Phason probe The extension cable connected to the temperature probe is p...

Page 22: ...includes power contactor relay and mounting hardware for easy mounting in an enclosure Power contactor kit model 122 1 includes power contactor relay on off auto switch and label snubber filter reduce...

Page 23: ...a display kit After replacing the display you will need to program the control If the bottom circuit board fails you can replace it with a control kit Model NVC 2 12 Display kit model K331003 Control...

Page 24: ...he product must not have been involved in an accident misused abused or operated or installed contrary to the instructions in our user and or installation manuals Phason s opinion about these items is...

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