tekmar 265 Boiler Control - Manual (Page 34)

© 2010 D 265 - 07/10 34 of 36
TEST SEQUENCE
Each step in the test sequence lasts 10 seconds.
During the test routine, if a demand from the system is present, the test sequence may be paused by pressing the Test button.
If the Test button is not pressed again for 5 minutes while the test sequence is paused, the control exits the entire test routine. If
the test sequence is paused, the Test button can be pressed again to advance to the next step. This can also be used to rapidly
advance through the test sequence. To reach the desired step, repeatedly press and release the Test button until the appropriate
device and segment in the display turn on.
Step 1 – The C.A. / Alert contact is closed.
Step 2 – The C.A. / Alert contact is opened if the Alert / C.A. DIP switch is set to Alert.
Step 3 – The primary pump is turned on.
Step 4 – For each Boiler that is set to automatic or CP1, the following sequence is used:
• The Boiler Pump is turned on.
• The Modulation Output is modulated up to the Minimum Modulation setting.
• The Boiler Enable Contact is closed and waits for at least 10 seconds or the Fire Delay time.
• If there is a demand, the Boiler is modulated up to Maximum Modulation according to the Motor Speed setting.
• If there is a demand, the Boiler is modulates down to Minimum Modulation.
• The Boiler Enable Contact is opened.
• The Modulation Output is modulated down to 0%.
• Boiler Pump is shut off.
• Step 4 is repeated for each additional boiler set to automatic, or CP1.
Step 5 – If Boiler 3 is set to OFF and DHW MODE is set to 3 or 4, the DHW contact is closed and the primary pump stays on.
– If Boiler 3 is set to OFF and DHW MODE is set to 1 or 2, the DHW contact is closed, and the primary pump is shut off.
Step 6 – The control exits the Test sequence.
MAX HEAT
The control has a function called Max Heat. In this mode, the control turns on and operates the system up to the maximum set
temperatures as long as there is a demand for heat. The control continues to operate in this mode for up to 24 hours or until the
Item, Menu or Test button is pressed. This mode may be used for running all circulators during system start-up in order to purge
air from the piping. To enable the Max Heat feature, use the following procedure.
Menu Item
Menu Item
1) Press and hold the Test button for more than 3 seconds. At
this point, the control flashes the MAX segment and displays
the word OFF.
2) Using the ▲ or ▼ buttons, select the word On. After 3 seconds,
the control turns on all outputs. However, the max heat mode
is still limited by the BOIL MAX setting.
3) To cancel the Max Heat mode, press the Item, Menu, or
Test button.
4) Once the Max Heat mode has either ended or is cancelled,
the control resumes normal operation.
The control has a built-in test routine that is used to test the main control functions. The
control continually monitors the sensors and displays an error message whenever a fault is
found. See the following pages for a list of the control’s error messages and possible causes.
When the Test button is pressed, the test light is turned on. The individual outputs and relays
are tested in the following test sequence.
Testing the Control