Commissioning of Tekmar 3624 Controller with Remote Room Sensor(RTU062)

• Check operation of Danfoss timeclock i.e. is it putting the tekmar into “occ” and “unocc” accordingly. The easiest way to do this is to put the timeclock switch to manual and press the on/off button and check the tekmar screen to see if it changes between occ and unocc. On being “occ” and off  being “unocc”.
• Ensure that the setback dipswitch is set to “setback”. Put the padlock dipswitch to “unlocked”. Go into the “misc” menu and put the access level to “ADV”. Go into the “adjust” menu and check all the items are as per the set up chart for this system. The only item which should be different is the “mix max” which should be set at 35ºC for drying the concrete floor gradually. This should be then raised to 55ºC once the concrete has properly cured.
• Switch one stat up (calling for heat) This should put a mix demand signal to the tekmar indicated by a black triangle beside “mix demand”. If this does not appear there is a wiring problem which must be rectified. The area to look at is the demand signal cable coming back from the Ivar wiring centre.
• Once you have a mix demand on the tekmar this will bring on both pumps and fire the boiler up to temperature. It will also operate the 4-port mixer to give the required temperature into the floor heating. You can go into the “view menu” and check the “mix trg” temperature (this is the temperature which the tekmar has decided to run the floor heating at) and then check the “mix sup” temperature (this is the actual temperature which is going to the floor heating manifold as measured by the mix supply sensor). The “mix trg” and “mix sup” temperatures should be very close after a few minutes of operation if the 4-port mixer has been fitted correctly.
• To double-check the operation of the 4-port mixer it is wise to get the tekmar to change its mix trg temperature. To do this change the “mix room occ” temperature to a high figure i.e.30ºC this will increase the mix trg temperature and you should check that the valve opens accordingly. Remember to put this value back to 21ºC after testing. These settings are accessed from the RTU.
• Once you are happy that the 4-port mixer is operating as it should, go on to check that all the room stats are operating the correct actuator on the manifold by switching each one on in turn. Remember that the actuators take 2-4 mins to open or close.
• You can now change the access level to “user” and put the padlock symbol to locked.
• With the end user you can run through the operation of the tekmar paying particular attention to the setting of the timeclock and also the four different temperature settings which they have access to in the adjust menu. You should programme the timeclock to an “on” period two hours before the client wants the property up to full temperature and then switch it to “off” two hours before they retire at night.
• The four different temperature settings which the client has access to in the adjust menu are as follows:-