tekmar 265 Boiler Control - Manual (Page 19)

19 of 36 © 2010 D 265 - 07/10
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 265 includes: One Boiler Control 265, One Outdoor Sensor 070, Two Universal Sensors 071, Data Brochures D 265, D 070,
D 001, Application Brochure A 265, Four 500 Ω resistors.
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
” (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
” (9 mm) to ensure proper connection to the control.
•
If an Outdoor Sensor 070 is used, install the sensor according to the installation instructions in the Data Brochure D 070 and run
the wiring back to the control.
•
Install the Boiler Supply Sensor 071 according to the installation instructions in the Data Brochure D 070 and run the wiring back
to the control.
•
If a Boiler Return Sensor 071 is used, install the sensor according to the installation instructions in the Data Brochure D 070 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.
Installation
BOILER PUMP OPERATION
The control can operate a boiler pump on each boiler in addition to the primary pump. The boiler pump turns on prior to the boiler
firing and continues to run after the boiler is turned off. The amount of time that the boiler pump turns on prior to the boiler firing is
determined by the boiler mass setting. As the boiler mass setting is increased, the boiler pump pre-purge time of the also increases.
However, if the control is operating only on a setpoint demand, the boiler pump turns on immediately before the boiler fires.
Boiler Pump Purge
The amount of time that the boiler pump continues to run after the boiler turns off is adjustable using the boiler pump purge setting
(PURG Boil Pmp).
Primary
Pump Boiler
Pump
Primary
Pump Boiler
Pump
Primary
Pump
Boiler
Pump