Tekmar tekmarNet 4 540 User manual

1 of 12 © 2010 U540 - 08/10
Zoning
U540
08/10
User Manual
tekmarNet®4 Thermostat 540
Congratulations on the purchase of your
tekmarNet®Thermostat! This product contains
the most advanced HVAC control technology in
order to ensure that your heating and cooling
systems run more efficiently and provide you
with the highest level of comfort.
Replaces: 03/09

© 2010 U540 - 08/10 2 of 12
This brochure will provide you with the information you need to benefit the most
from your tekmarNet®thermostat. Please visit www.tekmarcontrols.com for more
detailed information on this or any other tekmar product.
This thermostat provides heating, cooling, and fan operation for one zone in your
building. The cooling system may send cool air into more than one heating zone, in
which case this thermostat will coordinate the change from heating to cooling.
The fan can be run with heating, cooling, or on its own to provide fresh air through
ventilation.
With the addition of one of tekmar’s energy saving accessories, this thermostat can
also lower its temperature setting at night or when you are away from the house.
Temperature Adjustment
You will be adjusting the temperature of the current operating mode. To adjust
temperature settings that are not shown on the screen, you must enter into the
Adjust Menu as described in the “Adjust Menu” section. There may be other symbols
on the screen that affect thermostat operation. Please see the “Display Symbols”
section for a description of each symbol.
This thermostat can operate at day or night temperatures (see “Day or
Night Temperatures” section) for HEAT and COOL settings. The temperature
can be adjusted as follows:
Step 1: Press the or button until the desired temperature is displayed.
Step 2: Release all buttons and wait for the display to return to normal operation.
The adjusted settings will be saved in memory.
Adjustment Buttons
Adjust the temperature
HEAT or COOL
displays depending
on Mode
Indicates
whether the day
or night
temperature is
being set
(if available).
If in Auto mode, press
the Mode button to
toggle between Heat
or Cool temperature
adjustment.
Note: Remember to
turn the mode back to
Auto after adjustments
are made.

3 of 12 © 2010 U540 - 08/10
Adjust Menu
This thermostat has an Adjust Menu that allows adjustment of all of its settings.
The following items can be adjusted or viewed:
Step 1: Press and hold the and buttons until the desired setting is shown
(a new screen will appear every 2 seconds).
Step 2: Press the or button to adjust the temperature setting.
Step 3: Press and hold the and buttons again to advance to the next
adjustable setting. Repeat steps 1 and 2 until all adjustments have
been made.
Step 4: Release all buttons and wait for the display to return to normal operation.
The adjusted settings will be saved in memory.
Day and night temperatures (if available)
HEAT and COOL temperatures
Fan on-time
Backlight on-time
Temperature units °F or °C
Thermostat type (view only)
•
•
•
•
•
•
The Adjust Menu can be accessed as follows:
This thermostat has access levels. It will typically be installed and programmed
by a heating professional and then locked in a “User” access level. System critical
settings will not be available for adjustment. For more information on these settings,
please consult your installing contractor or this product’s Installation and Operation
Manual. The following pages describe the settings available to the “User”.
Indicates setting
is in the Adjust menu
Press and Hold
and together
Indicates
whether the day
or night
temperature is
being set
(if available).
Indicates
whether HEAT
or COOL is
being adjusted

© 2010 U540 - 08/10 4 of 12
This thermostat is capable of running at a lower temperature setting when you are
asleep or out of the building. An energy saving accessory can be added to your
tekmarNet®system in order to activate these energy saving setback temperatures.
If one is connected, day and night temperature settings will be available.
They are adjusted as follows:
479 User Switch
With the touch of a button,
tell every thermostat in
your house to operate at
their night setback or
Away temperature.
033 Timer
Program a night
setback schedule for
all of your thermostats
with one device.
tekmarNet®Energy Saving Accessories
----------------------------
----------------------------
Examples of these settings are as follows:
Mode of Operation day night
HEAT example: 70°F (21°C) 65°F (18°C)
COOL example: 78°F (26°C) 85°F (30°C)
Note: The presence of a schedule is indicated by the clock symbol.
Step 1: Press and hold the and buttons to enter the Adjust Menu, and
wait until the desired setting is shown with the day symbol on the
screen (a new setting will appear every 2 seconds).
Step 2: Press the or button to adjust the temperature setting.
Step 3: Press and hold the and buttons until the same setting is shown
with the night symbol on the screen.
Step 4: Press the or button to adjust the temperature setting.
Step 5: Release all buttons and wait for the display to return to normal operation.
The adjusted settings will be saved in memory.
Day and Night Temperatures
Day or Night
Setting
Press and
Hold and
together

5 of 12 © 2010 U540 - 08/10
This thermostat has 4 operating modes: Auto, Cool, Heat, and Off. In order to
change the thermostat mode:
Operating Mode
Step 1: Press the Mode button until the desired Mode is displayed.
Step 2: Wait for the display to return to normal operation. The thermostat will
be operating in the selected Mode.
When in Off mode, the thermostat will still operate heating in order to protect the
building from freezing. If the air temperature drops below 40°F (4.5°C), heating
will be turned on.
When in Auto mode, the thermostat will automatically switch between heating and
cooling with the following conditions:
There will be a 30 minute interlock period when switching from heating to cooling
where no heating or cooling will take place. This is to prevent excessive cycling
of equipment and wasted energy.
In Auto mode, the thermostat will not allow adjustment of heating and cooling
settings to within 3°F (1.5°C) of each other. If you adjust the heating setpoint
within 3°F (1.5°C) of the cooling setpoint, the cooling setpoint will be automatically
adjusted to the heating setpoint plus 3°F (1.5°C) and vice versa. This is also to
prevent excessive equipment cycling and wasted energy.
•
•

© 2010 U540 - 08/10 6 of 12
The fan should already be programmed to operate as necessary for heating, cooling,
and ventilation. However, the fan operation can be changed manually by pressing
the Fan button.
The fan operation will appear in the top right corner of the screen when the fan
button is pressed. The following table describes each mode.
Auto The fan will operate as programmed when required for heating, cooling,
or ventilation.
On The fan will run continuously. Heating and cooling operation will occur
as programmed.
10-90%
This will only be available if ventilation has been programmed to be
on. This is the percentage of each hour the fan will run for.
Off This will only be available if the thermostat does not require the fan for
heating or cooling. The fan will not run.
Fan Operation
If a % run time is selected, the thermostat will run the fan as needed for heating or
cooling operation, then will continue operation if necessary to satisfy the % run time
requirement. For example, if a 50% run time is chosen (30 minutes out of 60) and
the heating or cooling has only run for 25% of an hour (15 minutes), the thermostat
will run the fan by itself for another 15 minutes.
Note: This thermostat can be configured such that the fan button does not have
any effect. Consult your installer or this product’s Installation and Operation Manual
for more information.
Fan
Operation
Indicates
whether the
Fan Operation
is being set for
day or night
(if available).
Step 1: Press the Fan button repeatedly until the desired Fan operation is
displayed
Step 2: Release all buttons and wait for the display to return to normal operation.
The adjusted setting will be saved in memory

7 of 12 © 2010 U540 - 08/10
Changing the Backlight
Press and
Hold and
together.
Step 1: Press and hold the and buttons to enter the Adjust Menu, and wait
until this screen appears (a new screen will appear every 2 seconds).
Step 2: Press the or button to adjust the backlight operation.
Step 3: Release all buttons and wait for the display to return to normal operation.
The adjusted setting will be saved in memory.
This thermostat has an LED backlight that can be configured as follows:
Off Permanently Off.
30 Temporary on for 30 seconds (when a button is pressed)
On Permanently On
On + On during and off during

© 2010 U540 - 08/10 8 of 12
Changing the Units (°F or °C)
This thermostat can display temperatures in °F or °C.
Step 1: Press and hold the and buttons to enter the Adjust Menu, and
wait until this screen appears (a new screen will appear every 2
seconds).
Step 2: Press the or button to adjust the units.
Step 3: Release all buttons and wait for the display to return to normal operation.
The adjusted setting will be saved in memory.
Press and
Hold and
together.

9 of 12 © 2010 U540 - 08/10
Display Symbols
In addition to the features described in this manual, there may be others operating
in the background. Among others, this thermostat will display symbols on its screen
in order to indicate what mode it is in, what temperature it is operating at, or what
equipment it is trying to turn on. This section describes each of those symbols.
Operating Mode Symbols
The operating mode will appear at the bottom left of the display. This indicates how
the thermostat will respond to temperature changes in your building.
HEAT The thermostat is programmed for heating only. No cooling operation
will occur.
COOL
The thermostat is programmed for cooling. No heating operation will
occur.
AUTO The thermostat will automatically switch between heating and cooling
as necessary with a 30 minute delay in between.
OFF The thermostat is off and will not provide any heating, cooling, or
ventilation operation, unless the room is at risk of freezing.
Equipment Operating Symbols
These symbols indicate the current status of the system.
The thermostat is requesting heat from the system.
The thermostat is requesting cooling from the system.
The fan is turned on.
The thermostat is a Cooling Group Master. It is controlling an air-conditioning
system that has heating thermostats within it. Those thermostats will
be locked out from heating when the cooling equipment is on and their
temperatures will be averaged for cooling operation.

© 2010 U540 - 08/10 10 of 12
Schedule Symbols
These symbols appear when a Schedule Master or User Switch is connected to the
system. Those devices will tell this thermostat what temperature setting to operate
at (day , night , or ). Refer to the “Day and Night Temperatures”
section for more information.
A Schedule Master is present in the system and this thermostat is
following that Master’s programmable schedule.
Operating at the Day temperature. If there is no Schedule Master or User
Switch in the system, the thermostat will always be in this mode.
Operating at the Night temperature. A setback enabling accessory or
Schedule Master thermostat has enabled setback.
Operating at the Away temperature. If flashing, the temperature
cannot be adjusted by pressing the up or down arrows. Consult the
Installation and Operation Manual for this product for more information
on this feature.
If flashing, the system is in Warm Weather Shut Down. The outdoor
temperature is above the WWSD setting. No heating will take place
while in WWSD.
Communication Symbols
These symbols appear when this thermostat is part of a network and/or when
there is something wrong in the system.
The thermostat is communicating with other devices in the network.
There is something wrong with the thermostat or the tekmarNet®system.
This usually occurs if a control component has failed or is set up incorrectly.
Contact your installing contractor for more information or consult the
Installation and Operation Manual for this product.

11 of 12 © 2010 U540 - 08/10
More Information
Frequently Asked Questions
This User Brochure contains standard information on how to make adjustments
to an installed product. More detailed information can be found in this product’s
Installation and Operation Manual (D540) at www.tekmarcontrols.com
Symptom Look for... Corrective Action
No heat or not
enough heat
and pressing
button does
not increase
temperature
H1 Symbol
H1 symbol indicates heat is on. If the H1
symbol is displayed and you still have no
heat, you may have an issue with your
heating appliance. Consult your heating
professional.
Flashing
WWSD Increase WWSD setting on tekmarNet® reset control.
Flashing Away
Press a user switch button other than
Away (typically or ) or go to your
Scenes page on you gateway and change
the scene to Occ or Unocc
Flashing MAX
The thermostat has a maximum air
temperature set that is preventing the
heating system from providing a higher
temperature. Call your installer or refer to
the Installation and Operation Manual for
information on how to adjust maximum
room temperature settings.
Heat 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
comfortable at the scheduled time.
Pressing
button does
not decrease
temperature
Flashing MIN There may be a minimum room temperature
set. Consult your heating professional.

All specifications are subject
to change without notice 12 of 12 U540 - 08/10.
tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.
Head Office: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
[phone] Fax. [phone]
Web Site: www.tekmarcontrols.com
Product design, software and literature
are Copyright © 2010 by:
tekmar Control Systems Ltd. and tekmar
Control Systems, Inc.
Day
(Comfort)
Night
(Economy)
Away
(Best
Economy
& DHW
Suspend)
Save Even More Energy - the Easy Way
User Switch 479
With the touch of one button, every part of
your home can switch between Day, Night
& Away temperature settings. While Away
on vacation, domestic water heating can
be suspended to save even more.
Great Accessories for Your
tekmarNet®System
Timer 033
Let the system automatically switch between
Day, Night & Away temperatures to match your
schedule. The Timer 033 can manage setback
for all of the thermostats in your system from
a central location.
Ask your installer about
adding a tekmarNet®User
Switch or Timer to add more
energy saving convenience
to your system.