- User Brochure |
U 262 |
Boiler Control 262 |
06/99 |
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Boiler Demand |
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DHW Demand |
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Setpoint Demand |
Occ° |
WWSD |
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Maximum |
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Boiler Control 262 |
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Two Stage Boiler & DHW / Two Stage DHW |
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The Boiler Control 262 is a microprocessor based control designed to stage and rotate two on/off boiler stages (or one low/high fire boiler) to maximize the comfort and efficiency of a hydronic heating system. The control is designed to operate in two distinct modes. Mode 1 allows for the control to provide a reset supply water temperature to a heating system, indirect Domestic Hot Water (DHW) generation, and the integration of a setpoint load. Multiple zone temperature control is achieved by using either thermostats or tekmar Zone Controls. Mode 2 is designed specifically for dedicated DHW applications in order to provide heat to a DHW storage system. Standard features include Equal Run Time Rotation, Auto Differential, digital temperature readouts, and pump exercising.
User Interface
Access Level(s) The tekmar Boiler Control 262 has four access levels which are LTD (limited), USER, INST (Installer), and ADV (advanced). This brochure only covers the LTD (Limited) and USER levels. Only qualified service people should adjust the INST (Installer) and ADV (advanced) access levels.
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Number Field |
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Displays the current value |
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name of the selected item |
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of the selected item |
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View |
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Boiler Demand |
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Adjust |
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DHW Demand |
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Monitor |
°F°C |
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Menu Field |
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Setpoint Demand |
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Displays the |
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min hr |
WWSD |
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current menu |
Misc |
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UnOcc |
Ovr |
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Maximum |
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DHW |
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Status Field |
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Displays the |
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current status of |
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the control’s |
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Selects Menu, |
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inputs, outputs |
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Items and adjusts |
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and operation |
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settings |
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The tekmar Boiler Control 262 has a Liquid Crystal Display (LCD) and four push buttons (Menu, Item, 
, ) which are used to view and adjust the settings.
Menu
All of the items displayed by the control are organized into various menus. These menus are listed on the left hand side of the display (Menu Field). To select a menu, use the Menu button. By pressing and releasing the Menu button, the display will advance to the next available menu. Once a menu is selected, there will be a group of items that can be viewed within that menu.
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 in a menu, pressing and releasing the Item button will return the display to the first item in the selected menu.
Adjust
To make an adjustment to a setting in the control, begin by selecting the appropriate menu using the Menu button. Then select the desired item using the Item button. Finally, use the 
and/or 
button to make the adjustment.
Additional information can be gained by observing the Status and Pointers fields 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.
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Burner |
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Displays when the stage 1 and |
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/ or stage 2 relay is turned on. |
Pump
1Displays when the boiler pump is operating.
DHW Pump / Valve
DHW Displays when the DHW pump or valve is on.
Boost
Displays when the control is in boost after setback.
UnOccupied
UnOcc Displays when control is in unoccupied mode.
Occupied
Occ Displays when the control is in occupied mode.
Override
Ovr Displays when the control is in override mode.
Warning
!Displays when an error exists or a limit has been reached.
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Lock - Unlock |
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Displays whether access |
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levels are locked or unlocked. |
°F, °C, sec, |
°F, °C, sec, min, hr, |
min, hr |
Units of measurement. |
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Pointer |
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Displays control operation as |
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indicated by text. |
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Copyright © 1999 U 262 -06/99 |
Note: Depending on the settings the installer makes in the control, certain menu items may not appear.
Item
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LTD |
USER |
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262 |
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Menu |
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Range |
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Current outdoor air temperature as measured by the outdoor sensor. |
-67 to 149˚F |
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This is the default display for the control. |
(-55 to 65˚C) |
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Target room air temperature. “— — —” denotes no heat is required. |
- - -, 35 to 100˚F |
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Will not display if RTU is connected. |
(2 to 38˚C) |
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Measured room air temperature at the indoor sensor. Will not display |
-58 to 167˚F |
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if RTU is connected. |
(-50 to 75˚C) |
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Current boiler supply water temperature as measured by the boiler |
-31 to 266˚F |
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sensor. |
(-35 to 130˚C) |
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Target DHW tank temperature. This item can only be viewed if a |
- - -, OFF, 70 to 190˚F |
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tekmar sensor is used to measure the DHW tank temperature. |
(OFF, 21 to 88˚C) |
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Current DHW tank temperature as measured by the DHW tank |
-31 to 266˚F |
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sensor. |
(-35 to 130˚C) |
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Item
LTD
USER 
262 Adjust
Menu 
Range
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The desired room air temperature during an Occupied period for |
35 to 100˚F |
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zones in the heating system. Will not display if RTU is connected. |
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(2 to 38˚C) |
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In LTD access level, this setting can only be adjusted ±3°F (±1°C). |
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The desired, room air temperature during an UnOccupied period for |
35 to 100˚F |
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UnOcc |
zones in the heating system. Will not display if RTU is connected. |
(2 to 38˚C) |
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The minimum temperature at the slab sensor, provided the control |
OFF, 35 to 120˚F |
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is not in Warm Weather Shut Down. This item can only be adjusted |
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(2 to 49˚C) |
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if a tekmar sensor is connected. |
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The amount the boiler supply water temperature will be reduced |
0 to 50˚F |
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when the control is in the UnOccupied mode. |
(0 to 28˚C) |
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Selects stage 1 as operational or not. |
AUTO, OFF |
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Selects stage 2 as operational or not. |
AUTO, OFF |
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The desired DHW storage tank’s temperature during the Occupied |
OFF, 70 to 190˚F |
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period. This item can only be adjusted if a tekmar sensor is used to |
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(21 to 88˚C) |
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measure the DHW tank temperature. |
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The desired DHW storage tank’s temperature during the UnOccupied |
OFF, 70 to 190˚F |
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period.This item can only be adjusted if a tekmar sensor is used to |
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UnOcc |
(21 to 88˚C) |
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measure the DHW tank temperature. |
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The heating system’s warm weather shut down during the |
35 to 100˚F, OFF |
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Occupied period. |
(2 to 38˚C) |
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The heating system’s warm weather shut down during the |
35 to 100˚F, OFF |
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UnOccupied period. |
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UnOcc |
(2 to 38˚C) |
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Copyright © 1999 U 262 -06/99 |
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