Tekmar D540 Installation & Operation Manual Download Page 1

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tekmarNet

4 Thermostat 540

Installation & Operation Manual

D540

08/10

Replaces:03/09

1 of 24

D 540 - 08/10

Zoning

The tekmarNet

4 Thermostat 540

provides operation for:

One Stage Heat
One Stage Cool
One Stage Fan

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Introduction

Features

Requires 7 wires (tN4, C, R, W,
Rc, Y, G)
Outdoor temperature display
Bright backlight
2 button temperature adjustment
Communication with other
tekmarNet

devices improves

system efficiency and comfort
Schedule member status enables
setback operation
Optimum start
Responds to tekmarNet

Scenes

Cooling Group Master
Freeze protection
Exercising
Zone synchronization

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Beneﬁ ts

Energy savings
Reduced temperature swings
Compatible with tekmarNet

Timers, User Switches and
Gateway for additional control
Interlock prevents simultaneous
heating & cooling

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Summary of Contents for D540

Page 1: ...ure display Bright backlight 2 button temperature adjustment Communication with other tekmarNet devices improves system efficiency and comfort Schedule member status enables setback operation Optimum start Responds to tekmarNet Scenes Cooling Group Master Freeze protection Exercising Zone synchronization Beneﬁts Energy savings Reduced temperature swings Compatible with tekmarNet Timers User Switch...

Page 2: ...the Thermostat Wiring 5 Mounting the Thermostat 6 Cleaning the Thermostat 6 Switch Settings 7 User Interface 8 Display 8 Symbols Description 8 Button Operation 9 Settings 10 15 Sequence of Operation 16 Heating Operation 16 Cooling Operation 17 Fan Operation 18 Schedules 19 Scenes System Override 19 Troubleshooting 20 Error Messages 20 21 Frequently Asked Questions 22 Job Record 23 Technical Data 2...

Page 3: ...wire is 500 feet 150 m Strip wire to 3 8 10 mm for all terminal connections Use standard 8 conductor 18 AWG wire Installation Location Removing The Thermostat Base Push tab 1 Remove thermostat from base 2 To remove the thermostat base Place a small slot screwdriver or similar tool into the slot located on the top of the thermostat While pushing down against the plastic tab pull the thermostat away...

Page 4: ...ect tN4 C R and W terminals on the thermostat to the tN4 C R and W terminals on the tN4 Wiring Center or Zone Manager Connect the Rc Y and G terminals on the thermostat to the R Y and G terminals on the cooling equipment 1 2 3 4 tN4 Wiring Center or tN4 Zone Manager Cooling Equipment 1 Stage Cooling 1 Stage Fan G Y R D X Fan Cooling tN4 C W R 1 2 3 4 tNt 540 540 One Stage Heat One Stage Cool One F...

Page 5: ...ss Mode button until Mode is set to HEAT 6 Press the button and set the heating temperature above the current room temperature Make sure the display does not show WWSD The H1 symbol should appear on the display 7 There should be continuity between the R 3 and W 4 terminals 8 Press Mode button until Mode is set to COOL 9 Press the button and set the cooling temperature below the current room temper...

Page 6: ...ted in a network and the communication is missing there may be an open or short circuit on the tN4 and C bus wires 1 Remove the front cover from the thermostat 2 To test for short circuits Disconnect the tN4 bus wires on one end Install wire nuts on each wire to ensure the wire ends are not touching Disconnect the tN4 bus wires on the other end Measure for continuity using an electrical meter If c...

Page 7: ...ON SETBACK The thermostat follows a programmable setback schedule as a schedule member if available Requires the installation of a Timer 033 to use this feature OFF OFF The thermostat does not follow a programmable setback schedule 2 ON SCENE The thermostat responds to changes in the scene system wide manual overrides Requires the installation of a User Switch 479 to use this feature OFF OFF The t...

Page 8: ...p of thermostats CLOCK Operating on a programmable schedule LOCK Locked to User access level AWAY Operating at the Away scene temperature tekmarNet Communication is present WARNING SYMBOL Indicates an error is present WARM WEATHER SHUT DOWN The heating system has been shut off for the summer Display Symbols Description Switch between Heat Cool Auto and Off modes Switch between Auto On and Fan oper...

Page 9: ...st be at least 3 F 1 5 C above the Set Room Heat temperature To switch from cooling to heating the cooling must be off for at least a 30 minute interlock period and the Room temperature must be at least 3 F 1 5 C below the Set Room Cool temperature Cooling has priority over heating Off Mode The heating and cooling are shut off except heating for freeze protection Mode Fan The fan button manually t...

Page 10: ...aller SET ROOM HEAT AWAY Set the room heating temperature while in the Away scene Continued on next page Press and hold down both the and buttons for 2 seconds to change from one step to the next Release both buttons once the step has been reached Press the or the button to change the setting if available Press and hold down both the and buttons for 2 seconds to go to the next step OR After 10 sec...

Page 11: ...efault 85 F 29 5 C Installer User SET ROOM COOL Set the room cooling temperature while in the event 50 to 100 F 10 to 38 0 C Default 85 F 29 5 C Installer SET ROOM COOL AWAY Set the room cooling temperature while in the Away scene Off 30 sec On On Default 30 sec Installer User BACKLIGHT Select the backlight operation Off Permanently Off 30 Temporary on for 30 seconds On Permanently On On On during...

Page 12: ...arge number with Software Version upper right corner and the thermostat address 40 to 95 F 4 5 to 35 0 C Default 85 F 29 5 C Installer MAXIMUM SET ROOM HEAT Set the maximum room heating limit while in the event 40 to 95 F 4 5 to 35 0 C Default 85 F 29 5 C Installer MAXIMUM SET ROOM HEAT Set the maximum room heating limit while in the event 40 to 95 F 4 5 to 35 0 C Default 45 F 7 0 C Installer MINI...

Page 13: ...om cool limit OFF On Default OFF Installer VENTILATION Select whether or not ventilation is required Setting to on allows the fan to be operated in 10 increments every hour to circulate air in the building 0 1 2 3 Default 1 Installer FAN MODE Select how the fan should operate together with heating and cooling 0 Manual operation only 1 Operate fan with cooling only 2 Operate fan with heating and co...

Page 14: ...percentage the fan should operate while in the event This provides ventilation for the building Each 10 is 6 minutes per hour Available when Ventilation is set to On 1 2 3 4 Default 1 Installer SCHEDULE Thermostat can follow schedule master 1 2 3 or 4 Available when Switch setting 1 is set to Setback On Position Hyd Hydronic or Oth Other Default Hydronic Installer HEATING TERMINAL TYPE Select if t...

Page 15: ...turn on be delayed for thermal motor or wax actuator or be off to allow a zone group pump per manifold Available when A reset control is present on the tekmarNet system AND Heating terminal type is set to Hydronic 01 to 24 no reset control b 01 to b 24 reset control boiler 1 01 to 1 24 reset control mixing Installer tekmarNet ADDRESS The address is shown in the large number field Auto is shown in ...

Page 16: ... furnace electric baseboard or electric fan coil while remaining connected to the tekmarNet system Exercising When connected to a tekmarNet reset control and the heating terminal unit is set to hydronic the thermostat exercises the heat relay for 10 seconds every 3 days Exercising helps prevent zone valves or zone pumps from failing due to precipitate buildup During exercising the thermostat shows...

Page 17: ...ure while the mode is set to Cool or the mode is set to Auto and the thermostat is allowing cooling operation In all other modes the cool group master thermostat measures and displays the built in local temperature sensor measurement Fluctuations in the displayed Room temperature may occur during automatic mode switch over when the display changes from using the local temperature for heating to us...

Page 18: ...n can also operate for additional time beyond what is required for the heating and cooling systems Ventilation allows the user to select the fan to operate for a minimum percentage out of each hour Options are 10 to 90 in 10 6 minutes per hour increments as well as Auto and On This is available when the Ventilation setting in the Adjust menu is set to On Once Ventilation is set to On the Fan minim...

Page 19: ...ule at unoccupied temperature Scene Display Room Temperature Setting 1 or or Follows programmable schedule or operates at the occupied temperature 2 Away Away temperature 3 Unoccupied temperature Scenes System Override Section E When a programmable schedule is selected there is a time delay for the temperature to change from the temperature to the temperature The thermostat uses Optimum Start to p...

Page 20: ...ed BUS ERROR The tekmarNet 4 communication bus has either an open or a short circuit The result is that there are no communications Check for loose wires Check for short circuits between the tN4 and C wires on the House Control Wiring Center or Zone Manager Check for correct polarity between the C and R wires Error clears automatically once wiring fault has been corrected If the thermostat is inte...

Page 21: ...holesaler or tekmar sales representative for details on repair procedures ROOM SENSOR OPEN CIRCUIT The built in air temperature sensor has an open circuit fault This error cannot be field repaired Contact your wholesaler or tekmar sales representative for details on repair procedures COOL MASTER ERROR Switch 3 has been selected to become a cool group master of group number 1 and another cool group...

Page 22: ...Press Mode button to Auto or Cool mode Heat or Cooling on yet Fan off Fan symbol Fan symbol indicates fan is on Check if fan relay and fan equipment is operating Fan set to Off Ensure fan mode is set correctly Heat or cooling on before scheduled time Optimum start learns the heat up and cool off rate of the room and starts the heating or cooling early so that the room is comforable at the schedule...

Page 23: ...________________________ Thermostat Location _____________________________________________ Technical Data tekmarNet 4 Thermostat 540 One Stage Heat One Stage Cool One Fan Packaged weight 0 8 lb 380 g Enclosure NEMA 1 white PVC plastic Dimensions 2 7 8 H x 2 7 8 W x 13 16 D 73 x 73 x 21 mm Approvals CSA C US meets Class B ICES and FCC Part 15 Ambient conditions Indoor use only 36 to 122 F 2 to 50 C...

Page 24: ...es not cover the cost of the parts or labor to remove or transport the defec tive Product or to reinstall the repaired or replacement Product all such costs and expenses being subject to Purchaser s agreement and warranty with its customers Any representations or warranties about the Products made by Purchaser to its customers which are different from or in excess of the tekmar Limited Warranty ar...

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