Tekmar D 262 Data Brochure
Tekmar D 262 Data Brochure

Tekmar D 262 Data Brochure

Boiler control

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- Data Brochure
Boiler Control 262
The Boiler Control 262 is a micro processor based control designed to maximize the comfort and efficiency of a hydronic heating system.
The control is designed to operate in two distinct modes.
MODE —1— (Two Stage Boiler & DHW) allows for the control of two separate on /off boiler stages (or one low / high fire) based on outdoor
air temperature, control for indirect Domestic Hot Water (DHW) generation and a Setpoint load. For single zone temperature control
with indoor temperature feedback, a Room Temperature Unit (RTU) or indoor sensor may be connected to the 262. Multiple zone
temperature control is achieved by using either a conventional thermostat system or by connecting a tekmar Zone Control to the 262.
MODE —2— is designed specifically for dedicated DHW applications. In Mode 2, the 262 can stage and rotate two on / off boiler stages
(or one low / high fire) in order to provide heat to a DHW storage system.
The 262 control includes a large Liquid Crystal Display (LCD) in order to view system status and operating information. The same LCD
is used when setting up and installing the control. Standard features include Equal Run Time Rotation, intelligent boiler operation, digital
temperature readouts, and pump exercising. With the addition of a monitoring feature, it is now possible to track pump and boiler running
hours, DHW tank temperature, outdoor and system high and low temperatures, boiler firing cycles, plus many other useful items.
Several energy saving features have been incorporated into the 262 such as Warm Weather Shut Down (WWSD), DHW post purge,
system setback, DHW priority and an automatic differential for boiler operation.
Boiler Control 262
Note:
Two Stage Boiler & DHW / Two Stage DHW
Boiler, DHW, or setpoint
demand must be powered
with 20 to 260 V (ac)
1
before the boiler is able
Boiler
to fire.
Input
Boiler
Demand
signal
Input
DHW Demand
signal
Input
Setpoint
Demand
signal
Input
120 V (ac)
Power
Supply
Output
Boiler System
Pump
M
Output
DHW Pump OR
DHW Valve
View
° F
1
1
2
Item
Menu
2
3
4
5
6
7
8
9
10
Com
DHW
Setp
Boil
DHW
Power
Dem
Dem
Dem
P1
Pmp / Vlv
N
L
Output
Output
Boiler
Setback
Boiler Demand
DHW Demand
None
Setpoint Demand
WWSD
Minimum
Operating Modes
Maximum
1 Two Stage Boiler & DHW
2 Two Stages for DHW
See product literature
INSTALLATION CATEGORY II
Made in Canada by
tekmar Control Systems Ltd.
tektra 929-03
115 V ±10% 60 Hz 900 VA
Power
Relays
230 V (ac) 7.5 A 1/3 hp, pilot duty 240 VA
Demands
20 to 260 V (ac) 2 VA
Signal wiring must be rated at least 300 V.
Wiring must be rated 194°F (90°C) minimum
Do not apply power
11
12
13
14
15
16
17
tN1/
Com
Stage
Stage
10K
tN2
1
1
2
2
Vie
° F
WWS
%
%
1
2
!
OR
Menu
Item
Input
Room
Remote
Temperature
Unit (RTU)
Module (RDM)
Boiler
1 of 36
Reset Ratio
Characterized
Heating Curve
T est
off
not testing
red
testing
red
For maximum heat,
press and hold Test
button for 3 seconds.
Meets Class B:
Canadian ICES
FCC Part 15
18 19
20
21 22
UnO
Com
DHW
Boil
Out
Sw
Vie
° F
WWS
%
%
1
2
!
Menu
Item
OR
LR 58233 E150539
Input
Display
Input
Zone Control
Copyright © D 262 -12/08
D 262
12/08
Input
Outdoor
Sensor Included
Input
Universal
Sensor Included
Input
Universal
Sensor Optional
Input
tekmar
Timer
Input
Slab Sensor
OR
Input
Indoor Sensor
70

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Summary of Contents for Tekmar D 262

  • Page 1 Room Temperature Unit (RTU) or indoor sensor may be connected to the 262. Multiple zone temperature control is achieved by using either a conventional thermostat system or by connecting a tekmar Zone Control to the 262.
  • Page 2: Table Of Contents

    Additional information can be gained by observing the Status field 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 262 -12/08 2 of 36...
  • Page 3: Description Of Display Elements

    UnOccupied Schedule Pointer UnOcc Displays when the control is in unoccupied Displays the control operation as indicated by mode. the text. Occupied Schedule Displays when the control is in occupied mode. 3 of 36 Copyright © D 262 -12/08...
  • Page 4: Sequence Of Operation

    Off Time BOILER MASS (Boil MASS) Fire Fire Delay Delay The Boiler Mass setting allows the installer to adjust the control to the thermal mass of different types of heat sources used. Time Copyright © D 262 -12/08 4 of 36...
  • Page 5 This feature is enabled by setting the Setback / None DIP switch to the Setback position, and providing either an external signal or an internal override. Note: AWAY does not require the DIP switch = Setback. 5 of 36 Copyright © D 262 -12/08...
  • Page 6: Section B: Boiler Reset

    The Reset Ratio method of controlling the supply water temperature is based solely on the outdoor air temperature. This method does not take into account the type of terminal unit that the heating system is using and therefore is not as accurate as a Characterized Heating Curve . Copyright © D 262 -12/08 6 of 36...
  • Page 7 Heating Curve for the boiler zones. This single setting replaces the (10) Boil STRT water temperature and OUT STRT air temperature settings used (27) (16) (-7) (-18) (-29) by the Reset Ratio . Outdoor Air Temperature 7 of 36 Copyright © D 262 -12/08...
  • Page 8 The SOF STRT function allows the 262 to slowly ramp the water temperature up to the required supply temperature. By allowing the temperature in the system to be adjusted slowly, the control reduces any thermal expansion noises and stresses that may be caused by a quick change in supply water temperature. Copyright © D 262 -12/08 8 of 36...
  • Page 9 Set the 10K item to ZoIn to add indoor temperature feedback control of multiple zones. Control Zone Control 262 Control of the zones is provided by connecting a tekmar Zone Control to the Com and 10K terminals Boiler Demand Occupied...
  • Page 10: Section C: Dhw

    A DHW demand is generated on the 262 by using one of two methods: either an external DHW demand from an aquastat or an internal demand from a 10K tekmar sensor. If an external and internal demand is present simultaneously, the control stops operation of the DHW.
  • Page 11 DHW priority, the 262 shuts off the boiler(s), but continues to operate the DHW while restarting the heating system. This allows some of the DHW return water to mix with the cool return water from the zones and temper the boiler return water. 11 of 36 Copyright © D 262 -12/08...
  • Page 12 While MODE —2— is selected, the Boiler Pump (Boil P1) contact is used to control the flow of heated water to the DHW tank. The DHW Pump contact may be used to control a recirculation pump. This pump will run continuously when the control is in Occupied , and be off during UnOccupied . Copyright © D 262 -12/08 12 of 36...
  • Page 13: Section D: Setpoint

    If the Boil SUP temperature is maintained at or above the required temperature during setpoint generation, this indicates that the boiler(s) has enough capacity for setpoint and possibly heating as well. As long as the Boil TRG temperature is maintained, setpoint and heating occur at the same time. 13 of 36 Copyright © D 262 -12/08...
  • Page 14: Installation

    • If a Remote Display Module (RDM) 040 is used, install the RDM according to the installation instructions in the Data Brochure D 040 and run the wiring back to the control. • If a tekmar Zone Control is used, run the wires from the Zone Control to the 262. Refer to the instructions supplied with the Zone Control.
  • Page 15 Connect the two wires from the Boiler Sensor 071 to the Com and Boil terminals (19 and 21). The Boiler Sensor is used by the 262 to measure the supply (outlet) water temperature from the boiler(s). 15 of 36 Copyright © D 262 -12/08...
  • Page 16: Testing The Wiring

    Com and 10K terminals (16 and 17). Zone Control Input If an external tekmar Zone Control is used, connect the wire from the Com Sen terminal on the Zone Control to the Com terminal (16) on the 262.
  • Page 17 (The boiler may have a flow switch that prevents firing until the boiler pump (P1) is running.) If the boiler operates properly, disconnect the power and remove the jumper. 17 of 36 Copyright © D 262 -12/08...
  • Page 18: Dip Switch Settings

    When the padlock is closed, the access level cannot be changed. To change the access level, set the DIP switch to the Unlocked , or down position. The current access level of the control or tekmar Net tN1/tN2 device is viewed in its Miscellaneous ( Misc ) menu.
  • Page 19: Access Levels

    Access Levels The tekmar Boiler Control 262 comes with four Access Level settings. These Access Levels restrict the number of Menus, Items, and Adjustments that can be accessed by the user. The four access levels are Limited (LTD), User (USER), Installer (INST) and Advanced (ADV).
  • Page 20: Control Settings

    • • -58 to 167˚F 10K = INDR (-50 to 75˚C) MODE = —1— This is the signal that is being received from a tekmar Zone Control. • - - -, 35 to 110˚F 10K = ZoIn (2 to 43˚C) MODE = —1—...
  • Page 21: Adjust Menu

    The design indoor air temperature used in the 35 to 100˚F heat loss calculations for the heating system. (2 to 38˚C) • • DIP switch = Characterized Heating Curve Default = 70°F (21°C) MODE = —1— 21 of 36 Copyright © D 262 -12/08...
  • Page 22 NONE, PUMP, VALV • • No Indirect DHW tank = NONE Default = PUMP MODE = —1— Selects if a tekmar sensor is being used to NONE, DHW • • measure the DHW tank temperature. Default = NONE DHW THRU ≠ NONE Copyright ©...
  • Page 23 Default = NONE MODE = —1— 35 to 100˚F, OFF The system’s warm weather shut down during the • • • (2 to 38˚C, OFF) Occupied period. MODE = —1— Default = 70°F (21°C) 23 of 36 Copyright © D 262 -12/08...
  • Page 24: Schedule Menu

    The type of setback override that is in effect. Ovr, TMPY UnOcc Ovr, PERM • • • • DIP switch = Setback UnOcc Ovr, AWAY Ovr AWAY is available even if DIP ≠ Setback Default = NONE Copyright © D 262 -12/08 24 of 36...
  • Page 25: Miscellaneous Menu

    • • • -67 to 149˚F Current outdoor air temperature. (-55 to 65˚C) • • • • Current slab (floor) sensor temperature. -58 to 167˚F (-50 to 75˚C) REMOTE 3 = SLAB 25 of 36 Copyright © D 262 -12/08...
  • Page 26 The lowest room air temperature recorded since this item • • • • • 14 to 167˚F was last cleared. (-10 to 75˚C) To clear, press & hold the UP & DOWN buttons Copyright © D 262 -12/08 26 of 36...
  • Page 27: Testing And Troubleshooting

    NOTE: Only if there is a boiler demand can the control be paused in step 1. Step 2 - The zc contact is turned on for 10 seconds. NOTE: Only if there is a boiler demand can the control be paused in step 2. 27 of 36 Copyright © D 262 -12/08...
  • Page 28: Troubleshooting

    Press the Test button on the control and follow the control through the test sequence as described in the Testing section. Pause the control as necessary to ensure that the correct device is operating Use the Test as it should. Routine Copyright © D 262 -12/08 28 of 36...
  • Page 29: Monitor Menu

    The total number of running hours for Stage 1 since this item • • 0 - 9999 hr was last cleared. This total time does not include the FIRE DLY time set in the Adjust menu. 29 of 36 Copyright © D 262 -12/08...
  • Page 30 This item is an adjustable warning. If a DHW demand exists 0:10 to 20:00 hr, continually for longer than this warning setting, the control will • display a warning message. DHW THRU ≠ NONE Default = OFF Copyright © D 262 -12/08 30 of 36...
  • Page 31: Error Messages

    Monitor menu of the control have been checked by the user or installer. Note: Access level must be ADV in order to clear the error. 31 of 36 Copyright © D 262 -12/08...
  • Page 32 / tN2 terminal and a Com terminal on the control. Either the wires leading to the tekmar NetTM tN1 / tN2 device are shorted or the polarity of the wires is reversed. Determine the cause and remove the short. The error message can be cleared by pressing either the Menu or Item button.
  • Page 33 Locate and repair the problem as described in the Data Brochure D 070. To clear the error message from the control, press either the Menu or Item button. REM 1 ≠ NONE 33 of 36 Copyright © D 262 -12/08...
  • Page 34 This warning message will be displayed if the boiler supply does not increase to the target temperature within a set time. The time limit is set using the NO HEAT item in the Monitor menu. To clear this warning, press either the Menu or Item button. Copyright © D 262 -12/08 34 of 36...
  • Page 35 Notes 35 of 36 Copyright © D 262 -12/08...
  • Page 36: Technical Data

    This warranty is in lieu of all other warranties, express or implied, which the Governing Law (being the law of British Columbia) allows parties to contrac- The liability of tekmar under this warranty shall be limited to, at tekmar's sole dis- tually exclude, including, without limitation, warranties of merchantability, cretion: the cost of parts and labor provided by tekmar to repair defects in materials fitness for a particular purpose, durability or description of the product, its...

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