Tekmar D 270 Скачать руководство пользователя страница 6

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The 

Motor Speed 

is the amount of time the boiler requires to go from 0% 

modulation to 100% modulation.

Gas valve actuating motors have a design time from fully closed to 
fully open which can be found in the manufacturer’s manual. The 

Motor Speed 

should be set to this time.

The 

Motor Speed 

setting for a Variable Frequency Drive (VFD) is the 

amount  of  time  required  to  go  from  a  stopped  position  to  100%  fan 
speed. Since a VFD has a very quick response rate, it may be necessary 
to increase the 

Motor Speed 

setting in order to increase the stability of 

the boiler modulation.

MODULATION RANGE (0 to 10 V (dc), 2 to 10 V (dc), 0 to 20 mA, 4 to 20 mA)

The modulation output can be adjusted from a 0 to 10 V (dc) or to a 2 to 10 V (dc) output range using the 

Boil Modulation 

setting.

If a 0 to 20 mA range is required, set the Boil Modulation item to 0 to 10 V (dc) and cut the jumper wire located next to the modulation 
output.
If a 4 to 20 mA range is required, set the Boil Modulation item to 2 to 10 V (dc) and cut the jumper wired located next to the 
modulation output.

MINIMUM MODULATION

MAXIMUM MODULATION

88%

0%

2 V (dc)

2 V (dc)

100%

10 V (dc)

9 V (dc)

Control's

Output

Signal

Range

Maximum

Modulation

Boiler's

Maximum

Input Signal

Boiler's

Input

Signal

Range

The minimum modulation defines the minimum output signal from the control to the boiler 
burner. It is based on a percentage of the control’s output signal range.

The 

Minimum Modulation 

setting for boilers with power burners is typically set to 

0%.

For boilers with electronic operators, the boiler’s input signal range may not match the 
output 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 formula:

For 0 to 10 V (dc)

:

Minimum Modulation = 

 0 V (dc) – Boiler’s Minimum Input Signal      

0 – 10 V (dc)

 x 100%

For 2 to 10 V (dc)

:

Minimum Modulation = 

 2 V (dc) – Boiler’s Minimum Input Signal 

2 – 10 V (dc)

 x 100%

Example:

A boiler requires a 1.8 V (dc) signal to fire the boiler at low fire. The boiler can be modulated to 10 V (dc) where it reaches high fire. This 
means the boiler’s input signal range is 1.8 to 10 V (dc). The 270 control has an output signal range of 0 to 20 mA.
To make the two signal ranges the same, the Minimum Modulation required is:

Minimum Modulation = 

0 V – 1.8 V

0 V – 10 V

x 100% = 18%

MAXIMUM MODULATION

MINIMUM MODULATION

18%

0%

0 V (dc)

1.8 V (dc)

100%

10 V (dc)

10 V (dc)

Control's

Output

Signal

Range

Minimum

Modulation

Boiler's Minimum

Input Signal

Boiler's

Input

Signal

Range

The maximum modulation defines the maximum output signal from the control 
to the boiler burner. It is based on a percentage of the control’s output signal 
range.

The 

Maximum Modulation 

setting for boilers with power burners is 

typically set to 100%.

For boilers with electronic operators, the boiler’s input signal range may not 
match the output signal range of the 270 control. The 

Maximum Modulation 

setting limits the control output range in order to match the boiler’s input 
range.

MODULATION

The Boiler Control 270 provides a modulating output signal to operate a single modulating boiler. The control first closes the boiler 
contact on to ignite the ignition sequence. The boiler is then modulated from the minimum modulation using Proportional, Integral 
and Derivative (PID) logic in order to satisfy the boiler target temperature.

MOTOR SPEED

Содержание D 270

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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