tekmar 374 Universal Reset Control User Manual

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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 374 includes: One Universal Reset Control 374, One Outdoor Sensor 070, Three Universal Sensors 082, Data Brochures
D 374, D 070, D 001, Application Brochure A 374.

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 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

” (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

” (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 Sensor 082 according to the installation instructions in the Data Brochure D 070 and run the wiring back to the
control.

•

Install the Mix1 and Mix2 Sensors 082 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.

•

120 V (ac) to be provided from a 15 A circuit breaker and must have a circuit disconnect installed.

•

Connect ground wires to ground bus bar in wiring area.

STEP FOUR

——————

ELECTRICAL CONNECTIONS TO THE CONTROL

General

The installer should test to confirm that no voltage is present at any of the wires. Push the control into the base and slide it down
until it snaps firmly into place.

Installation

Powered Input Connections

115 V (ac) Power

Connect the 115 V (ac) power supply to the

Power L and Power N terminals (14 and 15).

This connection provides power to the microprocessor and display of the control.
As well, this connection provides power to the

Prim P1 terminal (16), the Mix1 P2

terminal (13), and the

Mix2 P3 terminal (17) from the Power L terminal (14).

115 V (ac)

Power