tekmar 268 Boiler Control - Manual (Page 6)

© 2010 D 268 - 11/10 6 of 32
RUNNING TIMES
The control displays the accumulated running time of each boiler in the VIEW menu. When using a multi-stage boiler, the running
time that is displayed is the total number of running hours of the Lo stage of the boiler.
Resetting the Running Times
To reset the running time for each boiler, select the appropriate running time in the VIEW menu. Next press the
▲
and
▼
buttons
simultaneously until CLR is displayed.
EXERCISING
The control has a built-in exercising feature that is selected through the Exercise / Off DIP switch. To enable the exercising feature set
the Exercise / Off DIP switch to Exercise. If exercising is enabled, the control ensures that each pump is operated at least once every
3 days. If a pump has not been operated at least once every 3 days, the control turns on the output for 10 seconds. This minimizes
the possibility of the pump seizing during a long period of inactivity. While the control is exercising, the Test LED flashes quickly.
Note: The exercising function does not work if power to the control or pumps is disconnected.
RELOADING FACTORY DEFAULTS
To reload the factory defaults, power down the control for 10 seconds. Power up the control while simultaneously holding the
Menu and
▼
buttons. The control will now display the E01 error message. To clear this error message, follow the procedure in the
Error Messages section of this brochure.
BOILER MINIMUM
The boiler minimum is the lowest temperature that the control is allowed to use as a boiler target temperature. During mild conditions,
if the control calculates a boiler target temperature that is below the BOIL MIN setting, the boiler target temperature is adjusted to at
least the BOIL MIN setting. During this condition, if the boiler(s) is operating, the minimum segment is turned on in the display when
viewing either the boiler supply temperature or the boiler target temperature. Set the BOIL MIN setting to the boiler manufacturer’s
recommended temperature.
BOILER MAXIMUM
The boiler maximum is the highest temperature that the control is allowed to use as a boiler target temperature. If the control does
target the BOIL MAX setting, and the boiler temperature is near the boiler maximum temperature, the maximum segment will be
displayed in the LCD while either the boiler target temperature or the boiler supply temperature is being viewed. At no time does
the control operate the boiler(s) above 248°F (120°C).
Section B1
Staging
MODE
The control is capable of staging single stage, two stage, three stage or four stage on / off heat sources. As well, in certain modes
of operation, the control is capable of controlling the individual boiler pumps. The control has 8 modes of operation based on the
type of staging and pump operation that is desired. The following describes the modes of operation.
Boiler
Pumps
Supply
Sensor
Return
Sensor
Primary
Pump
Section B: Staging Operation
Section B1: Staging
Mode 1: 9 Single Stage Boilers and a primary pump.
Mode 2: 4 Single Stage Boilers with individual boiler pumps and a primary pump.
Mode 3: 4 Lo/Hi boilers and a primary pump.
Mode 4: 3 Lo/Hi boilers with individual boiler pumps and a primary pump.
Mode 5: 3 Three Stage Boilers and a primary pump.
Mode 6: 2 Three Stage Boilers with individual boiler pumps and a primary pump.
Mode 7: 2 Four Stage Boilers and a primary pump.
Mode 8: 1 Four Stage Boiler with a boiler pump and a primary pump.