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Watts Tekmar 256, Руководство по установке и эксплуатации, Страница: 4 / 20

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POWERING UP THE CONTROL 

 

When  the  Boiler  Control  256  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 256 operates a single on / off heat source to control the supply 

water temperature to a hydronic system. The supply water temperature 

is based on the current outdoor air temperature and the 

Characterized 

Heating Curve

 settings. 

SETBACK (UNOCCUPIED) 

To provide greater energy savings, the 256 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 

Com

 (3) and the 

UnO Sw 

(4) 

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 256 

adjusts the supply water temperature based on the UNOCC settings made in the control.

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.

Section  A

General Operation

Page 4

Section B

Boiler Reset

Page 5-8

4 of 20

© 2019 tekmar  256_D - 09/19

Outdoor Design

Increasing W

ater 

Temperature

Design Supply

Decreasing Outdoor Temperature

Terminal Unit

Indoor Design

3

4

Timer switch

Com UnO

Sw

Sequence of Operation

Section A — General Operation

Содержание Tekmar 256

Страница 1: ... Input 24 V ac Power Supply Output Boiler Input tekmar Timer Optional BOIL F OCC Input Boiler Demand Signal PRGM S TIME AMPM UNOCC OVR S M W T F T 1 2 Press Release all 3 buttons to adjust menu Press Hold Item to view settings to test Boiler Control 256 One Stage Boiler Item Date Code Power 24 V 10 50 60 Hz 3 VA Class 2 Relay 240 V ac 5 A 1 6 hp Meets Class B Canadian ICES FCC Part 15 H1190D Termi...

Страница 2: ...yed 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 ri...

Страница 3: ... the selected item Terminal Unit TARGET INDR DSGN DIFF BOIL OUTDR ROOM WWSD F C MAX MIN OCC UN VIEW ADJUST Boiler Demand Burner Displays when the boiler relay is turned on F C F C Displays the unit of measure that all of the temperatures are to be displayed in the control OCC Occupied Schedule Displays when the control is in occupied Day mode UNOCC Unoccupied Schedule Displays when the control is ...

Страница 4: ...rted together the control operates in the unoccupied Night mode When in the unoccupied Night mode the UNOCC segment is displayed in the LCD The 256 adjusts the supply water temperature based on the UNOCC settings made in the control 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 re...

Страница 5: ...l 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 maintai...

Страница 6: ...r 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 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 an...

Страница 7: ...he BOIL TARGET temperature The boiler maximum is the BOIL DSGN plus 10 F 5 C but limited to 225 F 107 C If the control does target the boiler maximum and the BOIL temperature is near the boiler maximum temperature the MAX segment will be displayed in the LCD while either the BOIL TARGET temperature or the BOIL temperature is being viewed At no time does the control operate the boiler above 248 F 1...

Страница 8: ...ever the control does not operate the heating system to satisfy this demand CAUTION Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards This electronic control is not intended for use as a primary limit c...

Страница 9: ...it snaps into place STEP TWO CONTROL INSTALLATION STEP THREE SENSOR INSTALLATION Caution Do not run sensor wires parallel to telephone or power cables If the sensor wires are located in an area with strong sources of electromagnetic interference shielded cable or twisted pair should be used or the wires can be run in a grounded metal conduit If using shielded cable the shield wire should be connec...

Страница 10: ...resents the heat load on the building a northern wall for most buildings The 070 should not be exposed to heat sources such as ventilation or window openings The 070 should be installed at an elevation above the ground that will prevent accidental damage or tampering Connect 18 AWG or similar wire to the two terminals provided in the enclosure run the wires from the sensor to the control Do not ru...

Страница 11: ... steel black iron pipe is used In general it is recommended that a temperature well be used for steel pipe of diameter greater than 1 1 4 32 mm Temperature wells are also recommended when large diameter pipes are used and fluid stratification is present Conduit Connection The Universal Sensor and Universal Sensor Enclosure 080 sold separately are specifically designed to mount onto a 3 8 10 mm ID ...

Страница 12: ...80 50 10 19 900 120 49 3 760 190 88 983 15 26 139 403 55 13 17 436 125 52 3 383 195 91 903 10 23 118 018 60 16 15 311 130 54 3 050 200 93 829 5 21 100 221 65 18 13 474 135 57 2 754 205 96 763 0 18 85 362 70 21 11 883 140 60 2 490 210 99 703 5 15 72 918 75 24 10 501 145 63 2 255 215 102 648 10 12 62 465 80 27 9 299 150 66 2 045 220 104 598 15 9 53 658 85 29 8 250 155 68 1 857 225 107 553 A good qua...

Страница 13: ...etween 21 and 27 V ac when the boiler demand device calls for heat Test The Outputs Boiler Make sure power to the boiler circuit is off and short the boiler wires When the boiler circuit is powered up the boiler should fire If the boiler does not turn on refer to any installation or troubleshooting information supplied with the boiler The boiler may have a flow switch that prevents firing until th...

Страница 14: ...d Input Connections Do not apply power to these terminals as this will damage the control Outdoor Sensor Connect the two wires from the Outdoor Sensor to the Out and Com terminals 2 and 3 The outdoor sensor is used by the 256 to measure the outdoor air temperature Universal Sensor Connect the two wires from the Universal Sensor to the Boil and Com terminals 1 and 3 This sensor is used by the 256 t...

Страница 15: ...n to set the desired temperature The ROOM UNOCC setting is set to the desired room air temperature during the unoccupied Night mode Note To increase or decrease space temperature during the unoccupied Night mode only adjust the ROOM UNOCC setting This is only used if a tekmar timer is installed Press and release the Item button to advance to the OUTDR DSGN adjustment Use the or button to set the o...

Страница 16: ...outdoor air temperature used in the heat loss calculation for the heating system 60 to 32 F 51 to 0 C B2 The type of terminal units that are being used in the heating system B2 S e c t i o n A d v a n c e d I n s t a l l e r Display Description Range Actual Setting The design indoor air temperature used in the heat loss calculation for the heating system 35 to 100 F 2 to 38 C B3 The design supply ...

Страница 17: ...F OFF B3 The system s warm weather shut down during the unoccupied Night period 35 to 100 F OFF 2 to 38 C OFF The units of measure that all of the temperatures are to be displayed in the control F C This item exits the ADJUST menu by pressing either the or button S e c t i o n A d v a n c e d I n s t a l l e r Display Description Range Actual Setting B3 Adjust Menu 2 of 2 2019 tekmar 256_D 09 19 1...

Страница 18: ...hours of time in troubleshooting a system Note flow directions in the system paying close attention to the location of pumps check valves pressure bypass valves and mixing valves Ensure correct flow direction on all pumps This is also a very useful step if additional assistance is required Document the control for future reference Before making any adjustments to the control note down all of the i...

Страница 19: ...act will operate for up to 10 minutes of a 20 minute cycle Locate and repair the problem as described in the Testing section To clear the error message from the control after the sensor has been repaired press the Item button The control is no longer able to read the boiler sensor due to an open circuit In this case if the BOIL MIN adjustment is set to OFF the control does not operate the Boiler c...

Страница 20: ... original cost of the defective product and such repair exchange or credit shall be the sole remedy available from tekmar and without limiting the foregoing in any way tekmar is not responsible in contract tort or strict prod uct liability for any other losses costs expenses inconveniences or damages whether direct indirect special secondary incidental or consequential arising from ownership or us...

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