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 © 2010          D 270 - 08/10

To calculate the Maximum Modulation, use the following formula:

For 0 to 10 V (dc)

:

Maximum Modulation =

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

0 – 10 V (dc)

 x 100%

For 2 to 10 V (dc):

Maximum Modulation =

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

2 – 10 V (dc)

 x 100%

Example:

A boiler’s input signal range is 2 to 9 V (dc). The 270 control has an output signal range of 2 to 10 V (dc). 
To make the two signal ranges the same, the Maximum Modulation required is:

Maximum Modulation =

2 V – 9 V

2 V – 10 V

x 100% = 88%

BOILER MASS

The 

Boiler Mass

 setting allows the installer to adjust the control to the thermal mass of the type of heat sources used in the 

application. The modulation of the boiler can become unstable if the incorrect 

Boiler Mass 

setting is chosen. A key sign of the boiler 

modulation being unstable is the flame will continue to increase and then decrease in short periods of time. By choosing a lower 

Boiler Mass 

setting, the boiler response will become more stable. 

Lo (1)

The 

Lo 

setting is selected if the boiler that is used has a low thermal mass. This means that the boiler has a very small water 

content and has very little metal in the heat exchanger. A boiler that has a low thermal mass comes up to temperature quite rapidly 
when fired. This is typical of many copper fin-tube boilers. The

 Lo Mass 

setting provides a fast response to the heating system.

Med (2)

The 

Med 

setting is selected if the boiler that is used has a medium thermal mass. This means that the boiler either has a large 

water content and a low metal content or a low water content and a high metal content. This is typical of many modern 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 thermal mass. This means that the boiler has both a large water 

content and a large metal content. A boiler that has a high thermal mass is relatively slow in coming up to temperature. This is 
typical of many commercial cast iron and steel tube boilers. The 

Hi Mass 

setting provides a slow response to the heating system.

DIFFERENTIAL

A modulating boiler must be operated with a differential while operating in low fire. The boiler differential is divided around the boiler 
target temperature. The boiler burner ignites at low fire when the supply water temperature is ½ of the 

Boiler Differential 

setting 

below the boiler target temperature. The boiler is shut off in low fire as the supply temperature reaches at least ½ of the differential 
above the boiler target temperature. With the control, either a fixed or an auto differential may be selected.

When the boiler is modulating above low fire, the differential does not apply. Instead, the modulation output signal is determined 
using Proportional, Integral and Derivative (PID) logic in order to satisfy the boiler target temperature.

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Time

Desired temperature
160°F (71°C)

Differential
10°F (6°C)

Boiler Off

Boiler On

155°F (68°C)

165°F (74°C)

Increasing Load

Time

Differential

On

Off

Fixed Differential

If the user desires to have a fixed differential, this is set using the 

Boiler Differential 

setting in the ADJUST menu.

Auto Differential

If the Auto Differential is selected, the control automatically determines 
the best differential as the load changes. This reduces potential short 
cycling during light load conditions.

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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