Tekmar 265 Boiler Control Bedienungsanleitung PDF herunterladen (Seite 5)

SETBACK (OCC and UNOCC)

To provide greater energy savings, the control has a setback feature. With setback, the

supply water temperature in the system is reduced when the building is unoccupied. By

reducing the supply water temperature, the air temperature in the space may be reduced

even when thermostat(s) are not turned down. Any time the UnO Sw (5) and the Com (1)

terminals are shorted together, the control operates in the unoccupied mode. When in the

unoccupied mode, the UNOCC segment is displayed in the LCD. The control adjusts the

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

COMBUSTION AIR OR ALERT CONTACT

The control has an isolated contact that can be used as either a combustion air damper contact or an alert contact. This selection

is made using the C.A. / Alert DIP switch.

Combustion Air (C.A.)

When the DIP switch is set to C.A., terminals 15 and 16 can be used as a switch to operate a combustion air damper. This contact

closes prior to the first boiler operating on the control. The amount of time that the contact closes prior to the first boiler firing is

set using the combustion delay setting.

The combustion air contact remains closed for a minimum of 15 seconds after the last boiler is turned off.

Alert

When the DIP switch is set to Alert, terminals 15 and 16 can be used as a switch to operate an alert circuit. This contact closes

whenever an error message is present on the control display. When the alert contact is activated, refer to the Error Messages

section of this brochure to determine the cause of the alert. Once the fault has been fixed, pressing either the Menu, Item, ▲ or ▼

button will clear the alert.

Boiler Alert

The control can monitor the boiler supply temperature and provide an alert if the temperature does not increase within a certain

amount of time. The amount of time can be set using the Boiler Alert setting. This alert can be used to determine if the boilers

have failed to fire. To reset the alert, press and hold the ▲ and ▼ buttons for 5 seconds while in the VIEW menu.

ROTATION

The control includes an Equal Run Time feature which changes the firing

order of the boilers whenever one boiler accumulates 48 hours more

running time than any other boiler. After each rotation, the boiler with the

least running hours is the first to fire and the boiler with the most running

hours is the last to fire. This function ensures that all of the boilers that

are being rotated receive equal amounts of use. When the Rotate / Off

DIP switch is set to the Off position, the firing sequence always begins

with lowest boiler to the highest boiler.

Fixed Lead Rotation

In some applications, it may be desirable to have the first boiler fire first

at all times while the firing sequence of the remaining boilers is changed

using Equal Run Time Rotation. This rotation option is selected by

setting the Fixed Lead / Off DIP switch to the Fixed Lead position.

First On / Last Off or First On / First Off

When using the Fixed Lead rotation option, a selection must be made between First On / Last Off and First On / First Off

using the DIP switch. When First On / Last Off is selected, the lead boiler is always modulated first and shut off last. When

First On / First Off is selected, the lead boiler is always modulated first and shut off first. This DIP switch is only read by the control

when the Fixed Lead / Off DIP switch is set to Fixed Lead.

Resetting the Rotation Sequence

To reset the rotation sequence, set the Rotate / Off DIP switch to the Off setting for 5 seconds and then return the DIP switch to

the Rotate setting.

RUNNING TIMES

The control displays the accumulated running time of each boiler in the VIEW menu.

Resetting the Running Times

To reset the running time for each boiler, select the appropriate running time in the VIEW menu. Next press the ▲ and ▼ buttons

simultaneously until CLr is displayed.

Com

–

Boil

Sup

Boil

Ret

Out

UnO

Timer Switch

720 hours 672 hours

672 hours 720 hours

1 2 3 4 5 6 7 8 9 10 ... 35 36

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