- Data Brochure |
D 261 |
Boiler Control 261 |
03/09 |
The Boiler Control 261 is designed to control two separate on / off boiler stages (or one low / high fire) in order to provide outdoor reset or setpoint operation. The control includes a Liquid Crystal Display (LCD) to view system status and operating information.
Additional functions include:
•Quick Setup for simple installation and programming of control
•User comfort adjustment to increase or decrease building space temperature
•Advanced settings to fine-tune building requirements
•Powered boiler pump output
•Test sequence to ensure proper component operation
•Setback input for energy savings
•120 V (ac) power supply
•CSA C US certified (approved to applicable UL standards)
BOIL |
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VIEW |
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°F |
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OCC |
1 2 |
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Terminal Unit |
Setpoint |
Boiler Demand |
Fire Delay Setpoint Demand
Item
Note:
Boiler or setpoint demand must be powered with 20 to 260 V (ac) before the boiler is able to fire.
Input
Boiler Demand
Signal
Boiler Control 261
Two Stage Boiler & Setpoint
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
Boiler |
Setpoint |
Power |
Boil |
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Demand |
Demand |
L |
N |
Pmp |
N |
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Input
Setpoint Demand
Signal
Advanced RotateReturn
To increase or decrease the building temperature:
Press the Item,
, 
buttons simultaneously for 1 sec. to enter the ADJUST menu
Use the 
, 
buttons to adjust the ROOM setting
Display defaults back to VIEW menu after 20 sec.
C US
158033
Installer |
Off |
Installer Instructions
ROOM - Set to desired room temp. OUTDR DSGN - Set to coldest (design) outdoor temp.
Terminal Unit |
Set to |
High Mass Radiant |
1 |
Low Mass Radiant |
2 |
Fan Coil |
3 |
Convector |
4 |
Radiator |
5 |
Baseboard |
6 |
Setpoint - Set to desired setpoint temp.
Refer to brochure for more information
Test
Made in Canada by |
Meets Class B: |
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Canadian ICES |
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tekmar Control Systems Ltd. |
FCC Part 15 |
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tektra 910-02 |
V (ac) 10 A 1/3 hp |
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Relays: |
240 |
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Power: |
120 |
V 50/60 Hz 1300 VA |
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Demand: |
20 to 260 V (ac) 2 VA |
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Do not apply power |
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13 14 15 16 17 |
Signal wiring must be |
H1108D |
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UnO Com Boil Out Com |
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rated at least 300V. |
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Input |
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Outdoor |
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Sensor Included |
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Input |
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Universal |
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Sensor Included |
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Output |
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Output |
Output |
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120 V (ac) Power |
Boiler System |
tekmar Timer |
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Supply |
Pump |
Boiler |
Boiler |
Optional |
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Copyright © D 261 - 03/09
How To Use The Data Brochure
This brochure is organized into four main sections. They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and 4) Troubleshooting. The Sequence of Operation section has three sub-sections. We recommend reading Section A: General Operation of the Sequence of Operation, as this contains important information on the overall operation of the control. Then read the sub-sections that apply to your installation. For quick installation and setup of the control refer to the Installation section, DIP Switch Settings section, followed by the Quick Setup section.
The Control Settings section (starting at DIP Switch Settings) of this brochure, describes the various items that are adjusted and displayed by the control. The control functions of each adjustable item are described in the Sequence of Operation.
Table of Contents
User Interface ................................................ |
pg 2 |
Quick Setup ................................................. |
pg 13 |
Description of Display Elements ................. |
pg 3 |
Control Settings .......................................... |
pg 14 |
Sequence of Operation ................................. |
pg 4 |
View Menu ........................................ |
pg 14 |
Section A: General Operation ........ |
pg 4 |
Adjust Menu ..................................... |
pg 14 |
Section B: Boiler Reset .................. |
pg 5 |
Testing and Troubleshooting ..................... |
pg 16 |
Section C: Setpoint......................... |
pg 8 |
Error Messages ............................... |
pg 18 |
Installation ..................................................... |
pg 9 |
Technical Data ............................................. |
pg 20 |
DIP Switch Settings .................................... |
pg 12 |
Limited Warranty ......................................... |
pg 20 |
Reference Material: Essay E 003 “Characterized Heating Curve and Reset Ratio”
User Interface
The 261 uses a Liquid Crystal Display (LCD) as the method of supplying information. You use the LCD in order to set up and monitor the operation of your system. The 261 has three push buttons (Item, 
, 
) for selecting, viewing, 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.
Item
The abbreviated name of the selected item will be displayed in the item field of the display. To view the next available item, press and release the Item button. Once you have reached the last available item, pressing and releasing the Item button will return the display to the first item.
Adjust
To make an adjustment to a setting in the control, press and hold simultaneously for 1 second, all 3 buttons. The display will then show the word ADJUST in the top right corner. Then select the desired item using the Item button. Finally, use the 
and / or 
button to make the adjustment.
Item
Item
To exit the ADJUST menu, either select the ESC item and press the 
or 
button, or leave the adjustment buttons alone for 20 seconds.
When the Item button is pressed and held in the VIEW menu, the display scrolls through all the adjust items in both access levels.
Additional information can be gained by observing the status field and pointers of the LCD. The status field will indicate which of the control’s outputs are currently active. Most symbols in the status field are only visible when the VIEW menu is selected.
Copyright © D 261 - 03/09 |
2 of 20 |
Display
Item Field |
Number Field |
Displays an |
Displays the current value |
abbreviated name of |
of the selected item |
the selected item |
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OUTDR DSGN |
DIFF |
VIEW |
ADJUST |
Menu Field |
BOIL TARGET |
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°F |
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Displays the |
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MINMAX |
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°C |
current menu |
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ROOM WWSD |
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min |
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1 2 |
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INDR UNOCC |
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Terminal Unit |
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Setpoint |
Boiler Demand |
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Fire Delay |
Setpoint Demand |
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Status Field |
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Buttons |
Displays the current |
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Selects Menus, Items and |
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{adjusts settings |
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status of the control’s |
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inputs, outputs and |
Item |
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operation |
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Symbol Description 
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Pump |
UNOCC |
Unoccupied Schedule |
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Displays when the control is in unoccupied |
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Displays when the boiler pump is in operation. |
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(Night) mode. |
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1 2 |
Burner |
°F, °C |
°F, °C |
Displays when the stage 1 and / or stage 2 relay |
Displays the unit of measure that all of the |
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is turned on. |
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temperatures are to be displayed in the control. |
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OCC |
Occupied Schedule |
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Pointer |
Displays when the control is in occupied (Day) |
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Displays the control operation as indicated by |
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mode. |
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the text. |
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Copyright © D 261 - 03/09 |
Sequence of Operation
Section A |
Section B |
Section C |
General Operation |
Boiler Reset |
Setpoint |
Page 4 |
Page 5-8 |
Page 8 |
Section A — General Operation 
POWERING UP THE CONTROL
When the Boiler Control 261 is powered up, the control displays the control type number in the LCD for 2 seconds. Next, the software version is displayed for 2 seconds. Finally, the control enters into the normal operating mode and the LCD defaults to displaying the current outdoor air temperature.
OPERATION
The 261 operates two on / off heat sources to control the supply water temperature to a hydronic system. The supply water temperature is based on either the current outdoor temperature, or a fixed setpoint.
Outdoor Reset
When a demand signal from the heating system is present, the 261 calculates a supply temperature based on the outdoor air temperature and Characterized Heating Curve settings.
Setpoint Control
When a demand signal from a setpoint system is present, the control operates the boiler(s) to maintain the supply water temperature at the Setpoint setting. Refer to section C.
Design Supply |
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Terminal Unit |
Temperature |
Indoor Design |
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Outdoor Design |
Increasing Water |
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Decreasing Outdoor Temperature 
SETBACK (UNOCCUPIED)
To provide greater energy savings, the 261 has a setback capability. With setback, the supply water temperature in the system is reduced when the building is unoccupied. By reducing the supply water temperature, air temperature in the space may be reduced even when thermostat(s) are not turned down. Any time the UnO Sw (13) and the Com (14) terminals are shorted together, the control operates in the unoccupied (Night) mode. When in the unoccupied (Night) mode, the UNOCC segment is displayed in the LCD. The 261 adjusts the supply water temperature based on the UNOCC settings made in the control. This feature has no effect when the control is used in setpoint operation.
ROTATION
13 |
14 |
UnO Com |
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Sw |
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Timer switch
The 261’s Equal Run Time Rotation function is fixed at 48 hours. The firing order of the boilers changes whenever one stage accumulates 48 hours more running time than the other stage. After each rotation, the stage with the least running hours is the first to fire, and the stage with the most running hours is the last to fire. This function ensures that both stages receive equal amounts of use. When the Rotate / Off DIP switch is set to the Off position, Stage 1 is always the first stage to fire.
EXERCISING
The 261 has a built-in exercising function. If the 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.
Note: The exercising function does not work if power to the control or pump is disconnected.
FACTORY DEFAULTS
The control comes preset with several factory defaults. These defaults are based on the terminal unit selection (see section B2). To fine-tune building requirements, these defaults may be changed. If a factory default value for a terminal unit is changed, the terminal unit number will flash when selected in the ADJUST menu.
To reload the factory defaults listed in section B2, power down the control and wait for 10 seconds. Power up the control while simultaneously holding the Item and 
buttons. The terminal unit number should now be displayed constantly in the LCD rather than flashing.
Copyright © D 261 - 03/09 |
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Section B: Boiler Reset
Section B1 |
Section B2 |
Section B3 |
General |
Installer |
Advanced |
Section B1: General 
BOILER DEMAND
A boiler demand is required in order for the 261 to provide heat to the heating system. A
boiler demand is generated by applying a voltage between 24 and 240 V (ac) across the Boiler Demand terminals (1 and 2). Once voltage is applied, the Boiler Demand pointer is displayed in the LCD. If the 261 is not in WWSD, the 261 closes the Boil Pmp contact. The
261 calculates a boiler target (BOIL TARGET) supply temperature based on the outdoor
24 to 240 V (ac)
air temperature and settings. The 261 then fires the boiler(s), if required, to maintain the target supply temperature.
1 |
2 |
Boiler |
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Demand |
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BOILER PUMP OPERATION (BOIL PMP)
The boiler pump contact (Boil Pmp, terminal 7) closes whenever there is a boiler demand and the 261 is not in WWSD. The boiler pump segment is displayed in the LCD. After the boiler demand has been satisfied, the 261 continues to operate the boiler pump for 20 seconds. This allows any excess heat to be purged out to the heating system. During WWSD, the boiler pump is operated based on the exercise function. For boiler pump contact operation during setpoint operation, refer to section C.
BOILER OPERATION
When the 261 determines that boiler operation is required, the boiler Stage contact(s) (9 and 10 and / or 11 and 12) close. While the boiler contact(s) is closed, the burner and stage segment in the LCD is displayed.
STAGING
The 261 controls up to two stages in order to supply the required target temperature. After the first stage is turned on in the firing sequence, the control waits a minimum amount of time before turning on the next stage. After the minimum time delay between stages has expired, the 261 examines the control error to determine when the next stage is to fire. The control error is determined using Proportional, Integral and Derivative (PID) logic.
Proportional - compares the actual supply temperature (BOIL) to the boiler target (BOIL TARGET) temperature. The colder the supply water temperature, the sooner the next stage is turned on.
Integral - compares the actual supply temperature (BOIL) to the boiler target (BOIL TARGET) temperature over a period of time.
Derivative - determines how fast or slow the supply water temperature is changing. If the supply temperature is increasing slowly, the next stage is turned on sooner. If the supply temperature is increasing quickly, the next stage is turned on later, if at all.
Each stage has a minimum on time, and a minimum off time.
CHARACTERIZED HEATING CURVE
The 261 varies the supply water temperature based on the outdoor air temperature. The control takes into account the type of terminal unit that the system is using. Since different types of terminal units transfer heat to a space using different proportions of radiation, convection and conduction, the supply water temperature must be controlled differently. Once the control is told what type of terminal unit is used, the control varies the supply water temperature according to the type of terminal unit. This improves the control of the air temperature in the building.
BOILER TARGET TEMPERATURE (BOIL TARGET)
The BOIL TARGET temperature is determined from the Characterized Heating Curve settings and the outdoor air temperature. The control displays the temperature that it is currently trying to maintain as the boiler supply temperature. If the control does not presently have a requirement for heat, it does not show a boiler target temperature. Instead, “- - -” is displayed in the LCD.
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Copyright © D 261 - 03/09 |
Section B2: Installer
OUTDOOR DESIGN (OUTDR DSGN)
The OUTDR DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is located. This temperature is used when doing the heat loss calculations for the building. If a cold outdoor design temperature is selected, the boiler supply temperature rises gradually as the outdoor temperature drops. If a warm outdoor design temperature is selected, the boiler supply temperature rises rapidly as the outdoor temperature drops.
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BOIL DSGN |
Temperature |
cold |
OUTDR |
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Water |
DSGN |
warm |
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Increasing |
BOIL INDR |
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Decreasing Outdoor Temperature 
ROOM OCC & UNOCC (ROOM)
The ROOM is the desired room temperature for the boiler zones, and it provides a parallel shift of the Characterized Heating Curve. The room temperature desired by the occupants is often different from the design indoor temperature (BOIL INDR). If the room temperature is not correct, adjusting the ROOM setting increases or decreases the amount of heat available to the building. A ROOM setting is available for both the occupied (Day) and unoccupied (Night) modes.
Increasing Water Temperature
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ROOM
BOIL INDR
Decreasing OutdoorTemperature 
TERMINAL UNITS
When using a Characterized Heating Curve, the control requires the selection of a terminal unit. The terminal unit determines the shape of the Characterized Heating Curve according to how the terminal unit delivers heat into the building space (refer to Essay E 003). The 261 provides for selection between six different terminal unit types: two types of radiant floor heat, fancoil, fin-tube convector, radiator and baseboard. When a terminal unit is selected, the control automatically loads the design supply temperature (BOIL DSGN), maximum supply temperature (BOIL MAX), and minimum supply temperature (BOIL MIN). The factory defaults are listed below. To change defaults, refer to section B3. If a default has been changed, refer to section A to reload the factory defaults.
Terminal Unit |
High Mass Radiant |
Low Mass Radiant |
Fancoil |
Fin-tube Convector |
Radiator |
Baseboard |
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(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
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BOIL DSGN |
120°F (49°C) |
140°F (60°C) |
190°F (88°C) |
180°F (82°C) |
160°F (71°C) |
150°F (66°C) |
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BOIL MAX |
140°F (60°C) |
160°F (71°C) |
210°F (99°C) |
200°F (93°C) |
180°F (82°C) |
170°F(77°C) |
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BOIL MIN |
OFF |
OFF |
140°F (60°C) |
140°F (60°C) |
140°F (60°C) |
140°F (60°C) |
High Mass Radiant (1)
This type of a hydronic radiant floor is embedded in either a thick concrete or gypsum pour. This heating system has a large thermal mass and is slow acting.
Default values: BOIL DSGN = 120°F (49°C), BOIL MAX = 140°F (60°C), BOIL MIN = OFF
Low Mass Radiant (2)
This type of radiant heating system is either attached to the bottom of a wood sub-floor, suspended in the joist space, or sandwiched between the sub-floor and the surface. This type of radiant system has a relatively low thermal mass and responds faster than a high mass system.
Default values: BOIL DSGN = 140°F (60°C), BOIL MAX = 160°F (71°C), BOIL MIN = OFF
Copyright © D 261 - 03/09 |
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