tekmar 262 User Manuals

- User Brochure

Boiler Control 262

U 262

06/99

View

Item

Boiler Control 262

Two Stage Boiler & DHW / Two Stage DHW

Boiler Demand DHW Demand

Setpoint Demand

WWSD

Occ

Minimum Maximum

NRTL/C

LR 58223

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.

Item Field

Displays an abbreviated name of the selected item

Menu Field

Displays the current menu

View Adjust Monitor

Schd Misc

Number Field

Displays the current value of the selected item

Boiler Demand DHW Demand

°F°

min

sec

UnOcc

DHW

Ovr

Setpoint Demand

WWSD

Minimum Maximum

Burner

Displays when the stage 1 and

1 2

/ or stage 2 relay is turned on.

Pump

Displays when the boiler pump is operating.

DHW Pump / Valve

Displays when the DHW pump

DHW

or valve is on.

Status Field

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

Item

Buttons

Selects Menu,

{

Items and adjusts settings

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.

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

button. By pressing and releasing the

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 reached the last available item in a menu, pressing and releasing the

Item

button. Once you have

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 use the

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.

button. Then select the desired item using the

and/or button to make the adjustment.

Item

button. Finally,

UnOcc

Occ

Ovr

F, °C, sec,

min, hr

Boost

Displays when the control is in boost after setback.

UnOccupied

Displays when control is in unoccupied mode.

Occupied

Displays when the control is in occupied mode.

Override

Displays when the control is in override mode.

Warning

Displays when an error exists or a limit has been reached.

Lock - Unlock

Displays whether access levels are locked or unlocked.

°F, °C, sec, min, hr,

Units of measurement.

Pointer

Displays control operation as indicated by text.

Note: Depending on the settings the installer makes in the control, certain menu items may not appear.

Item

Occ

LTD

• •

•

• •

•

• •

LTD

• •

USER

Current outdoor air temperature as measured by the outdoor sensor. This is the default display for the control.

Target room air temperature. “— — —” denotes no heat is required. Will not display if RTU is connected.

Measured room air temperature at the indoor sensor. Will not display if RTU is connected.

Current boiler supply water temperature as measured by the boiler sensor.

Target DHW tank temperature. This item can only be viewed if a tekmar sensor is used to measure the DHW tank temperature.

Current DHW tank temperature as measured by the DHW tank sensor.

USER

The desired room air temperature during an Occupied period for zones in the heating system. Will not display if RTU is connected. In LTD access level, this setting can only be adjusted ±3°F (±1°C).

262 View Menu

262

Adjust

Range

-67 to 149˚F (-55 to 65˚C)

- - -, 35 to 100˚F (2 to 38˚C)

-58 to 167˚F (-50 to 75˚C)

-31 to 266˚F (-35 to 130˚C)

- - -, OFF, 70 to 190˚F (OFF, 21 to 88˚C)

-31 to 266˚F (-35 to 130˚C)

Range

35 to 100˚F (2 to 38˚C)

UnOcc

Occ

UnOcc

The desired, room air temperature during an UnOccupied period for zones in the heating system. Will not display if RTU is connected.

•

The minimum temperature at the slab sensor, provided the control is not in Warm Weather Shut Down. This item can only be adjusted

•

if a tekmar sensor is connected.

The amount the boiler supply water temperature will be reduced when the control is in the UnOccupied mode.

•

Selects stage 1 as operational or not.

•

Selects stage 2 as operational or not.

•

The desired DHW storage tank’s temperature during the Occupied period. This item can only be adjusted if a tekmar sensor is used to

•

measure the DHW tank temperature.

The desired DHW storage tank’s temperature during the UnOccupied period.This item can only be adjusted if a tekmar sensor is used to

•

measure the DHW tank temperature.

The heating system’s warm weather shut down during the Occupied period.

•

The heating system’s warm weather shut down during the UnOccupied period.

•

35 to 100˚F (2 to 38˚C)

OFF, 35 to 120˚F (2 to 49˚C)

0 to 50˚F (0 to 28˚C)

AUTO, OFF

OFF, 70 to 190˚F (21 to 88˚C)

35 to 100˚F, OFF (2 to 38˚C)

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