tekmar 263 Boiler Control User Manual

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SETPOINT PRIORITY OVERRIDE

The setpoint has a Priority Override while in SETP MODE 2. In order to prevent the building from cooling off too much or the
possibility of a potential freeze up during setpoint priority, the control limits the amount of time for setpoint priority. As the outdoor air
temperature becomes colder, the length of time the control provides setpoint priority is reduced. Once the allowed time for priority
has elapsed, the control overrides the setpoint priority and operates setpoint and heating simultaneously by turning on the primary
pump (Prim P1).

CONDITIONAL SETPOINT PRIORITY

If the boiler(s) supply 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 boiler target temperature is maintained,
setpoint and heating occur at the same time.

Installation

CAUTION

Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury. It is
your responsibility to ensure that this control is safely installed according to all applicable codes and standards. This electronic
control is not intended for uses as a primary limit control. Other controls that are intended and certified as safety limits must be
placed into the control circuit. Do not open the control. Refer to qualified personnel for servicing. Opening voids warranty and could
result in damage to the equipment and possibly even personal injury.

STEP ONE

GETTING READY

Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or tekmar
sales representative for assistance.

Type 263 includes: One Boiler Control 263, One Outdoor Sensor 070, One Universal Sensor 082, One 500 Ω Resistor, Data Brochures
D 263, D 070, D 001, Application Brochure A 263.

Note: Carefully read the details of the Sequence of Operation to ensure that you have chosen the proper control for your application.

STEP TWO

MOUNTING THE BASE

Remove the control from its base by pressing down on the release clip in the wiring chamber and sliding the control away from it.
The base is then mounted in accordance with the instructions in the Data Brochure D 001.

STEP THREE

ROUGH-IN WIRING

All electrical wiring terminates in the control base wiring chamber. The base has standard

7 8

in (22 mm) knockouts, which accept

common wiring hardware and conduit fittings. Before removing the knockouts, check the wiring diagram and select those sections
of the chamber with common voltages. Do not allow the wiring to cross between sections, as the wires will interfere with safety
dividers which should be installed at a later time.

Power must not be applied to any of the wires during the rough-in wiring stage.

•

All wires are to be stripped to a length of

3 8

in (9 mm) to ensure proper connection to the control.

•

Install the Outdoor Sensor 070 according to the installation instructions in the Data Brochure D 070 and run the wiring back to

the

control.

•

Install the Boiler Supply Sensor 082 according to the installation instructions in the Data Brochure D 070 and run the wiring

back to the control.

•

If a DHW Sensor 082 is used, install the sensor according to the installation instructions in the Data Brochure D 070 and run

the wiring back to the control.

•

If an Indoor Sensor 076 or 077 is used, install the indoor sensor according to the instructions in the Data Brochure D 074 and

run the wiring back to the control.

•

Run wire from other system components (pumps, boilers, etc.) to the control.

•

Run wires from the 115 V (ac) power to the control. Use a clean power source with a 15 A circuit to ensure proper operation.

Multi-strand 16 AWG wire is recommended for all 115 V (ac) wiring due to its superior flexibility and ease of installation into
the

terminals.