Frequently Asked Questions - tekmar Controls

How can I turn down the heat with my boiler control if the building is too hot during mild outdoor weather?

The boiler control has an automatic warm weather shut down that turns off the boiler. Lowering the warm weather shut down setting will reduce or prevent over heating.

On a three-button control, press all three buttons at the same time, then let go. The control is now in the adjust menu. Press and release the Item button until you find the WWSD (warm weather shut down setting). Then press the down arrow button to reduce the setting. Wait 20 seconds and the control will record the setting and go back to the View menu.

On a four-button control, press the menu button to enter the Adjust menu. Press and release the Item button until you find the WWSD (warm weather shut down setting). Press the down arrow button to reduce the setting. Wait 20 seconds and the control will record the setting and go back to the View menu.

In general, large apartment buildings can have the WWSD set to 55 to 65ºF (12 to 18ºC) and residences can have the WWSD set from 65 to 70ºF (18 to 20ºC).

What does it mean when my tekmar thermostat says OPN or OPEN?

OPN or OPEN means that there is an open electrical circuit on an auxiliary temperature sensor input. In the wiring area, check to see if an auxiliary sensor has been connected to the thermostat. If there are no wires connected to the auxiliary sensor terminals, the SENSOR setting in the ADJUST MENU can be set to OFF to correct the problem.

If there is a sensor connected, check the wiring for loose connections or broken wires. In some cases the auxiliary temperature sensor may have failed and requires replacement. For specific information, locate the three digit product number of the thermostat, and enter it below to view the product page. Refer to the product Installation and Operation Manual that is available on the Technical tab. Once the issue has been corrected, it is recommended to change the thermostat to the User access level.

How can I turn up the heat with tekmar boiler control when the building is too cool?

Boiler controls have a ROOM setting that selects the approximate temperature in the building. The boiler control does not measure the actual room temperature so the ROOM setting is simply the approximate desired temperature in the building. To get more heat, increase the ROOM temperature setting in 2-degree increments until the building feels warm.

On a three-button control, press all three buttons together, then let go. You will enter the Adjust menu. The first setting is the ROOM setting. Press the up arrow button to increase the setting. Wait 20 seconds and the control will record the setting and go back to the View menu.

On a four-button control, press the menu button to enter the Adjust menu. The first setting is the ROOM setting. Press the up arrow button to increase the setting. Wait 20 seconds and the control will record the setting and go back to the View menu.

How can I find the instruction manual for a tekmar control?

Each tekmar product has a three-digit product number. Most controls have the product number on the front; thermostats will have the three-digit product number inside the wiring area. If you are not sure, use this page to locate the product number of your control.

Once you have your product number, enter it into the 'Search' box at the top of this website. The product page will contain everything you need to know about your product, including service bulletins, software updates and all associated user and installation manuals.

My building is under heating, especially when it’s cold outside.

On the display the boiler control will show the outdoor temperature reading in the View menu. In some cases, the outdoor temperature is reading much warmer than the actual ambient outdoor air temperature. This results in the heating system using cooler water temperatures to heat the building.

The location and installation of the outdoor air sensor on the outside of the building is very important. The outdoor sensor should be installed on a north-facing wall and away from any heat sources such as direct sunlight, vents, doors, and windows. Warm air from the building can travel from inside the building along the hole in the wall where the sensor wire is pulled. Ensure this hole is sealed using silicone or spray foam.

I have a mixing control and it shows a mixing demand but it will not open the mixing valve or the variable speed injection pump.

Mixing controls are designed to provide boiler return protection. On the control display, check the boiler temperature measurement in the View menu. Then enter the Adjust menu and check the BOILER MIN setting. If the measured boiler temperature is below the boiler minimum setting, the mixing control is designed to close the mixing valve or reduce the speed of the variable speed injection pump.

Why won’t my boiler(s) fire? I wired the control with power and connected my boiler to it but it is not turning on the boiler(s). The boiler does fire when I press the test button.

Classic series tekmar controls require a call for heat, or demand, to be applied to the control. Check the display to see if a boiler demand is present, you may not have provided a demand to the control. Use the building thermostat, or end switches from zone valves or zone pump relays to apply either 24 V (ac) power to the demand terminals on the control.

I have a boiler staging control and a couple of mixing controls (classic series). It doesn’t seem as if the mixing controls are providing enough heat and the building is under heating.

Both the boiler staging controls and the Mixing controls have a ‘Boiler Minimum’ setting to protect the boiler(s). The boiler and mixing controls are reading the boiler temperature at different locations, supply vs. return. Therefore, you must set the ‘Boiler Minimum’ setting on the mixing controls at least 20°F cooler than the ‘Boiler Minimum’ setting on the boiler staging control. Otherwise the mixing controls back off too soon while the boiler control thinks everything is okay.

I have two controls on my system, can I connect them both to one outdoor sensor?

No, for classic series controls each control requires its own outdoor sensor. Example: Two 356 mixing controls, each require their own outdoor sensor 070.

However, professional and designer series communicating controls use a network to share information such as the outdoor temperature. Once a single outdoor sensor 070 is connected to a control or thermostat, the outdoor temperature is available on all products within the system.

Can't find the answer to your question? Contact your local representative for technical support.