Tekmar D 270 Data Brochure Download Page 3

 

3 of 24 

 © 2010          D 270 - 08/10

Display

Symbol Description

Boiler Demand
DHW Demand
Modulation
DHW Priority Override

Menu Field

Displays the
current menu

Item Field

Displays an
abbreviated
name of the
selected item

Status Field

Displays the
current status
of the control's
inputs, outputs
and operation

Number Field

Displays the current value
of the selected item

Buttons

Selects Menus, Items
and adjust settings

Burner

Displays when Relay 1 is turned on.

Warning

Displays when an error exists or when a limit 
has been reached.

Pump

Displays when the primary or boiler pump is 
operating.

Lock / Unlock

Displays when the Advanced /
Installer DIP switch is set to Installer.

DHW

Displays when the DHW pump is on.

°F, °C, min, hr, %

Units of measurement.

Occupied Schedule

Displays  when  the  control  is  in  occupied 
mode.

Pointer

Displays the control operation as indicated 
by the text.

UnOccupied Schedule

Displays when the control is in unoccupied 
mode.

Modulating Output Scale

Displays the total modulation output level of 
the boiler.

Summary of Contents for D 270

Page 1: ...Indr UnO Boil Com Sw Boiler Control 270 One Modulating Boiler DHW Boiler Pmp P2 DHW Pmp Vlv H2039A Menu Item Boiler Demand DHW Demand Modulation DHW Priority Override Test o not testing red testing r...

Page 2: ...sh buttons Menu Item for selecting and adjusting settings As you program your control record your settings in the ADJUST menu table which is found in the second half of this brochure Menu All of the i...

Page 3: ...gs Burner Displays when Relay 1 is turned on Warning Displays when an error exists or when a limit has been reached Pump Displays when the primary or boiler pump is operating Lock Unlock Displays when...

Page 4: ...m The supply water temperature is based on outdoor reset or a fixed temperature for DHW Outdoor Reset When a boiler demand signal from the heating system is present the control operates the boiler s t...

Page 5: ...calculates a boiler target temperature that is below the Boiler Minimum setting the boiler target temperature is adjusted to at least the Boiler Minimum setting During this condition if the boiler is...

Page 6: ...ut signal range of the 270 control The Minimum Modulation setting limits the control output range in order to match the boiler s input range To calculate the Minimum Modulation use the following formu...

Page 7: ...residential cast iron boilers or steel tube boilers The Med Mass setting provides a moderate response to the heating system Hi 3 The Hi setting is selected if the boiler that is used has a high therm...

Page 8: ...of time that the primary pump continues to run is adjustable using the Primary Pump Purge setting The primary pump continues to run until either the purging time has elapsed or the boiler supply temp...

Page 9: ...ight periods INDOOR SENSOR With the indoor sensor connected the control is able to sense the actual room temperature Indoor temperature feedback fine tunes the supply water temperature in the heating...

Page 10: ...on the WWSD pointer in the display When the control is in WWSD the Boiler Demand pointer is displayed if there is a boiler demand However the control does not operate the heating system to satisfy thi...

Page 11: ...contact is opened until the heating system has recovered before returning to DHW operation This mode can be used if a DHW tank is piped in direct return and a DHW valve is installed DHW MODE 4 Extern...

Page 12: ...heat from the boiler into the DHW tank The control continues this purge for a maximum of four minutes or until the boiler supply water temperature drops 20 F 11 C below the boiler target temperature d...

Page 13: ...or Sensor 070 One Universal Sensor 082 Data Brochures D 270 D 070 D 001 Application Brochure A 270 Note Carefully read the details of the Sequence of Operation to ensure that you have chosen the prope...

Page 14: ...power supply must be used to power both the DHW Demand and the Boiler Demand circuits since they both share the Com Dem terminal Output Connections Primary Pump Contact Prim P1 The Prim P1 output term...

Page 15: ...When these two terminals are shorted together the control registers an unoccupied UNOCC signal Connection to Operate Modulating Boiler 11 12 Mod V dc V dc STEP FIVE TESTING THE WIRING General Each ter...

Page 16: ...e wiring between the terminal block and pump and refer to any installation or troubleshooting information supplied with the pump If the pump operates properly disconnect the power and remove the jumpe...

Page 17: ...oth with water and wring out prior to wiping control Do not use solvents or cleaning solutions DIP Switch Settings GENERAL The DIP switch settings on the control are very important and should be set t...

Page 18: ...measured by the boiler supply sensor 22 to 266 F 30 to 130 C Boiler Target Boiler target temperature is the temperature the control is currently trying to maintain at the boiler supply sensor of the...

Page 19: ...F 82 C B1 Boiler Minimum The minimum allowed boiler target temperature Check the boiler manufacturer s manual for a recommended setting OFF 80 to 180 F OFF 27 to 82 C Default 140 F 60 C B1 Boiler Maxi...

Page 20: ...C Default 180 F 82 C DHW Exchange Unoccupied Selects whether or not a DHW demand will be responded to during the UnOccupied period OFF On Default OFF WWSD Occupied The system s warm weather shut down...

Page 21: ...essed 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...

Page 22: ...ystem start up in order to purge air from the piping To enable the Max Heat feature use the following procedure 1 Press and hold the Test button for more than 3 seconds At this point the control flash...

Page 23: ...to read the boiler supply sensor due to a short circuit The control will not operate the boiler until the sensor is repaired Locate and repair the problem as described in the Data Brochure D 070 To cl...

Page 24: ...AND FITNESS FOR A PARTICULAR PURPOSE DURA BILITY OR DESCRIPTION OF THE PRODUCT ITS NON INFRINGEMENT OF ANY RELEVANT PATENTS OR TRADEMARKS AND ITS COMPLIANCE WITH OR NON VIOLATION OF ANY APPLICABLE EN...

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