tekmar 261 User Manual

- 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

• 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)

• Powered boiler pump output

Note:

Boiler or setpoint demand must be powered with 20 to 260 V (ac) before the boiler is able to ﬁre.

BOIL

OCC

Terminal Unit Boiler Demand

Setpoint

Fire Delay

Item

Boiler Control 261

Two Stage Boiler & Setpoint

2345 6

Setpoint

Boiler

Demand

VIEW

1 2

Setpoint Demand

7 8

Power

Boil

Pmp

To increase or decrease the building temperature:

Item

ADJUST

ROOM

11 12

Stage 2

, , buttons

setting

C US

158033

VIEW

Do not apply power

13 14 15 16 17

UnO

Press the simultaneously for 1 sec. to enter the Use the , buttons to adjust the

Display defaults back to menu after 20 sec.

910

Stage

Advanced

Installer

Test

Made in Canada by tekmar Control Systems Ltd. tektra 910-02

Power: Relays: Demand:

Com

Boil

Return

Rotate

Off

ROOM OUTDR DSGN

outdoor temp.

Terminal Unit Set to

High Mass Radiant Low Mass Radiant Fan Coil Convector Radiator Baseboard

Setpoint - Set to desired setpoint temp.

Refer to brochure for more information

50/60 Hz 1300 VA

120 V 240 V (ac) 10 A 1/3 hp 20 to 260 V (ac) 2 VA

Signal wiring must be rated at least 300V.

Out

Com

Installer Instructions

- Set to desired room temp.

- Set to coldest (design)

1 2 3 4 5 6

Meets Class B: Canadian ICES FCC Part 15

Date Code

H1108D

Input

Boiler Demand

Signal

Setpoint Demand

Input

Signal

120 V (ac) Power

Input

Supply

Output

Boiler System

Pump

Output

Boiler

Output

Boiler

TIME

PRGM

AMPM

UNOCC OVR

SMWTFT

Input

tekmar Timer

Optional

Input

Outdoor

Included

Sensor

Input

Universal

Included

Sensor

How To Use The Data Brochure

This brochure is organized into four main sections. They are: 1)

Troubleshooting

of the

Sequence of Operation

that apply to your installation. For quick installation and setup of the control refer to the followed by the

The

Control Settings

displayed by the control. The control functions of each adjustable item are described in the

Sequence of Operation

. The

, as this contains important information on the overall operation of the control. Then read the sub-sections

Quick Setup

section.

section (starting at

section has three sub-sections. We recommend reading Section A:

DIP Switch Settings

Sequence of Operation

) of this brochure, describes the various items that are adjusted and

, 2)

Installation

Table of Contents

User Interface ................................................ pg 2

Description of Display Elements ................. pg 3

Sequence of Operation ................................. pg 4

Section A: General Operation........

Section B: Boiler Reset ..................

Section C: Setpoint.........................

Installation ..................................................... pg 9

DIP Switch Settings .................................... pg 12

pg 4

pg 5

pg 8

Quick Setup ................................................. pg 13

Control Settings .......................................... pg 14

View Menu ........................................

Adjust Menu .....................................

Testing and Troubleshooting .....................pg 16

Error Messages ...............................

Technical Data ............................................. pg 20

Limited Warranty ......................................... pg 20

Installation

section,

Sequence of Operation

, 3)

Control Settings

General Operation

DIP Switch Settings

, and 4)

section,

pg 14

pg 18

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 ( 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 have reached the last available item, pressing and releasing the 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 to make the adjustment.

To exit the ADJUST menu, either select the ESC item and press the seconds.

When the

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.

Item

button is pressed and held in the VIEW menu, the display scrolls through all the adjust items in both access levels.

Item

button. Finally, use the

Item

, , ) for selecting, viewing, and adjusting settings. As you

Item

button. Once you

Item

button will return

and / or

or button, or leave the adjustment buttons alone for 20

button

Item

Display

Item Field

Displays an abbreviated name of the selected item

OUTDR BOIL

ROOM WWSD INDR

Terminal Unit

Status Field

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

DSGN

TARGET

MAXMIN

OCC

Fire Delay

Item

DIFF

Setpoint

Setpoint Demand

Number Field

Displays the current value of the selected item

VIEW ADJUST

min

1 2

Boiler Demand

Buttons

Selects Menus, Items and

{

adjusts settings

Menu Field

Displays the current menu

Symbol Description

Pump

Displays when the boiler pump is in operation.

Burner

1 2

Displays when the stage 1 and / or stage 2 relay is turned on.

OCC

Occupied Schedule

Displays when the control is in occupied (Day) mode.

UNOCC

F, °C

Unoccupied Schedule

Displays when the control is in unoccupied (Night) mode.

°F, °C

Displays the unit of measure that all of the temperatures are to be displayed in the control.

Pointer

Displays the control operation as indicated by the text.

Sequence of Operation

Section A

General Operation

Page 4

Section B

Boiler Reset

Page 5-8

Section C

Setpoint

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

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

Characterized Heating Curve

setting. Refer to section C.

settings.

Design Supply

Terminal Unit

Indoor Design

Decreasing Outdoor Temperature

Outdoor Design

Increasing Water 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 (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

The 261’s 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

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

Note:

Equal Run Time Rotation

DIP switch is set to the

Test

LED flashes.

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.

Com

UnO

UnO Sw

function is fixed at 48 hours. The firing order of the boilers changes whenever one stage accumulates

Off

position, Stage 1 is always the first stage to fire.

(13) and the

Com

Timer switch

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 than flashing.

Item

and buttons. The terminal unit number should now be displayed constantly in the LCD rather

Section B: Boiler Reset

Section B1

General

Section B2

Installer

Section B3

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

displayed in the LCD. If the 261 is not in WWSD, the 261 closes the 261 calculates a boiler target (BOIL TARGET) supply temperature based on the outdoor air temperature and settings. The 261 then fires the boiler(s), if required, to maintain the target supply temperature.

BOILER PUMP OPERATION (BOIL PMP)

The boiler pump contact ( 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 boiler contact(s) is closed, the burner and stage segment in the LCD is displayed.

terminals (1 and 2). Once voltage is applied, the

Boil Pmp

, terminal 7) closes whenever there is a boiler demand and the 261 is not in WWSD. The boiler

Boiler Demand

Boil Pmp

contact. The

Stage

contact(s) (9 and 10 and / or 11 and 12) close. While the

pointer is

24 to 240 V (ac)

Boiler

Demand

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 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.

Characterized Heating Curve

settings and the outdoor air temperature. The

Section B2: Installer

BOIL DSGN

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

cold

OUTDR

DSGN

warm

rises rapidly as the outdoor temperature drops.

BOIL INDR

Increasing Water Temperature

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.

TERMINAL UNITS

When using a shape of the

Characterized Heating Curve

Increasing Water Temperature

Decreasing OutdoorTemperature

, the control requires the selection of a terminal unit. The terminal unit determines the

according to how the terminal unit delivers heat into the building space (refer to Essay

ROOM

BOIL INDR

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

BOIL DSGN BOIL MAX BOIL MIN

High Mass Radiant

120°F (49°C) 140°F (60°C)

OFF

High Mass Radiant (1)

(1)

Low Mass Radiant

(2)

140°F (60°C) 160°F (71°C)

OFF

Fancoil

(3)

190°F (88°C) 210°F (99°C) 140°F (60°C)

Fin-tube Convector

180°F (82°C) 200°F (93°C) 140°F (60°C)

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

(4)

Radiator

(5)

160°F (71°C) 180°F (82°C) 140°F (60°C)

Baseboard

(6)

150°F (66°C)

170°F(77°C)

140°F (60°C)

+ 14 hidden pages