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© 2019 OJ Electronics A/S

PWM: Pulse Width Modulation 2/2

Auto:

 Similar to “PWM On”, but the PWM period is 

increased or decreased depending on the minimum and 
maximum temperature measured during a PWM period  
This will increase the lifetime of the relay by reducing the 
number of relay switches, and still ensure the comfort 
of the user by keeping the temperature swings below an 
acceptable level 

Menu structure:

 PWM:  oFF;  on;  AUt
  oFF:  diF: 0,3 - 10,0
  on:  CYC: 15 - 60    
  AUt:  CYHi: 10 - 60
 

  CYLo: 10 - 30

(Options available may vary depending on version)

Summary of Contents for MTD3-1999

Page 1: ...2019 OJ Electronics A S MTD3 1999 User Manual 67772A 06 19 AML...

Page 2: ...9 TP Temperature Read out 10 LCD Display Settings 11 ADJ Adjust 12 NSB Night Setback 13 DEF Frost Protection 14 PWM Pulse Width Modulation 1 2 15 PWM Pulse Width Modulation 2 2 16 PLI Power Limit 1 2...

Page 3: ...0 40 C a night setback frost protection and limit temperatures that ensure your comfort and protect your property from temperature excesses The front cover can be flipped down The on off switch is loc...

Page 4: ...ed temperature Lgd LCd SCA C nu diS SP tP AdJ AdJ Measured temperature 10 C n5b nSb 2 0 C 8 0 C dEF dEF 5 0 C 10 0 C Pvm PWM oFF on AUt oFF diF 0 3 10 0 on CYC 15 60 AUt CYHi 10 60 AUt CYLo 10 30 Menu...

Page 5: ...Meaning Icon Meaning Scheduled operation Night setback Frost protection mode Heating is activated Child lock is engaged Fahrenheit is chosen as temperature scale Celsius is chosen as temperature scale...

Page 6: ...mostat as a regulator AF With this setting the internal room sensor controls the heating system subject to maximum and minimum limits for floor temperature The maximum temperature limit protects woode...

Page 7: ...S APP Sensor Application 2 2 AE With this setting an optional external room sensor connected to the floor sensor terminals controls the heating system Options available may vary depending on version M...

Page 8: ...floors from drying out For detailed information please ask your flooring supplier Access the menu Scroll through the menu until you come to SCA Press the middle button to enter the scale settings Use...

Page 9: ...r temperature drops below the minimum temperature limit the thermostat will activate the heating system to maintain the temperature above the set minimum Note that this feature is only applicable in s...

Page 10: ...ation is set to C Access the menu Scroll through the menu until you come to TP Press the middle button to enter the temperature read out Either the floor sensor temperature the room sensor temperature...

Page 11: ...tings are not applicable if the sensor applicati on is set to C Access the menu Scroll through the menu until you come to LCD Press the middle button to enter the temperature scale setting Use the top...

Page 12: ...re would be higher than the ambient temperature Adjust is not applicable if the sensor application is set to C You can calibrate the sensor with 10 C in steps of 0 1 C in the following way Access the...

Page 13: ...lative values The setpoint specifies in per cent the time the unit is to remain active in a PWM cycle which is usually 20 minutes while the reset degrees figure is specified as a percentage of the set...

Page 14: ...ues between 5 10 in steps of 0 5 C If the application is set to C and Frost protection is selected the frost protection is set in absolute values in per cent Access the menu Scroll through the menu un...

Page 15: ...ending on the average temperature measured in a fixed period of time 15 60 minutes Depending on the temperature deviation the duty cycle of the on time is increased or decreased giving longer or short...

Page 16: ...um temperature measured during a PWM period This will increase the lifetime of the relay by reducing the number of relay switches and still ensure the comfort of the user by keeping the temperature sw...

Page 17: ...vance that unintentional covering up of floor area might occur In this case it would be important to assess the correct period of time for which the floor heating must be time limited The heating can...

Page 18: ...the result of the equation is negative then nothing should be entered The function is factory set to 0 minutes but can be set to values between 0 30 minutes in steps of 1 minute Access the menu Scroll...

Page 19: ...th a reset period during both night and daytime and 2 events only using a reset period for the night The different event schedules of the MTD3 has the following definitions OFF Events are disabled and...

Page 20: ...tiNE Press the middle button to enter the time and event settings Use the top and bottom buttons to toggle between the different schedule modes Confirm your choice with the middle button Use the top...

Page 21: ...This option provides a read out containing the software number Access the menu Scroll through the menu until you come to SU Press the middle button to enter the software read out Press the middle but...

Page 22: ...a time out function If no button is pressed for 30 seconds the thermostat will return to the main screen Note that settings are saved when the menu is exited When in the menu Scroll through the menu u...

Page 23: ...from the backlight Check for the padlock icon the child lock might be activated Child Lock The child lock can be activated directly if the thermostat is idle or if the thermostat s backlight is activ...

Page 24: ...er downwards Align the top of the new front cover with the top of the thermostat Press at the bottom of the new front cover applying pressure where the taps are located BR1033A08a 2016 OJ Electronic A...

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