Tekmar 268 Boiler Control Manual do Utilizador descarregar pdf (Página 4)

Section A

General

Operation

Page 4 - 6

Section B

Staging

Page 6 - 8

Section C

Pump

Operation

Page 8 - 9

Section D

Boiler Reset

(Stand Alone)

Page 9 - 11

POWERING UP THE CONTROL

When the control is powered up, all segments in the LCD are turned on for 2 seconds. Next, 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.

OPERATION

The control operates up to nine 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, an external 0 - 10 V (dc) or 2 - 10 V (dc) signal,

or a fixed setpoint.

Section F

Setpoint

Page 15 - 15

Decreasing Outdoor Temperature

Increasing Water Temperature

Terminal UnitTerminal Unit

Indoor DesignIndoor Design Outdoor DesignOutdoor Design

Design SupplyDesign Supply

The following defined terms and symbols are used throughout this manual to bring attention to the presence of hazards of various risk

levels, or to important information concerning the life of the product.

INSTALLATION

CATEGORY II

- Warning Symbol: Indicates presence of hazards which can cause severe personal injury, death or

substantial property damage if ignored.

- Double insulated

- Local level, appliances

Definitions

Sequence Of Operation

Section A: General Operation

Section G

External

Input

Page 16 - 17

Section E

DHW

Page 12 - 14

Boiler Reset (Stand Alone)

When a boiler demand signal from the heating system is present, the control operates

the boiler(s) to maintain a supply temperature based on the outdoor air temperature and

Characterized Heating Curve settings.

Domestic Hot Water

When a DHW demand signal from a DHW aquastat is present, the control operates the

boiler(s) to maintain the supply water temperature at least as hot as the DHW XCHG

setting. Refer to section E.

Setpoint

When a setpoint demand signal from a setpoint system is present, the control operates

the boiler(s) to maintain the supply water temperature at least as hot as the SETP setting.

Refer to section F.

External Input 0 - 10 V (dc) or 2 - 10 V (dc)

When an external input signal is present, the control converts the signal to a target supply temperature. The control operates the

boiler(s) to maintain the required supply water temperature.

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