tekmar 157 Difference Setpoint Control - Manual (Page 8)

© 2010 D 157 - 06/10 8 of 16
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 use as a primary limit control. Other controls that are
intended and certified as safety limits must be placed into
the control circuit.
Caution
Installation
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 157 includes: One Difference Setpoint Control 157, One
Universal Sensor 071, One Solar Sensor, 085, Data Brochures
D 157, D 070, D 085, D 001, Application Brochure A 157.
Note: Carefully read the details of the Sequence of
Operation to ensure that you have chosen the proper
control for your application.
The control is mounted in accordance with the instructions in the Data Brochure D 001.
Step Two — Mounting
Step Three — Rough-in Wiring
The variable speed pump and second pump wiring
terminates in the electrical box. All other wiring terminates
in the two wiring chambers on the control. Determine
whether the low voltage wiring enters the wiring chamber
through the back or the bottom of the control. The wiring
is roughed-in to the electrical box prior to installation of the
control (see Brochure D 001). Standard 18 AWG solid wire
is recommended for all low voltage wiring, and multi-strand
16 AWG wire is recommended for 120 V (ac) wiring. Power must not be applied to any of the wires during
the rough-in wiring stage.
Install the Source Sensor 085 and Storage Sensor 071
according to the instructions in the Data Brochures D 085
and D 070, and run the wiring back to the control.
Run wires from the 24 V (ac) power to the control. Use a
clean power source to ensure proper operation. •
•
Step Four — Testing the Wiring
The following tests are to be performed using standard
testing practices and procedures, and should only be
carried out by properly trained and experienced persons.
A good quality electrical test meter, capable of reading from
at least 0 - 300 V (ac) and at least 0 - 2,000,000 Ohms, is
essential to properly test the wiring and sensors.
Test the Sensors
In order to test the sensors, the actual temperature at
each sensor location must be measured. A good quality
digital thermometer with a surface temperature probe is
recommended for ease of use and accuracy. Where a
digital thermometer is not available, a spare sensor can be
strapped alongside the one to be tested, and the readings
compared. Test the sensors according to the instructions
in the Data Brochures D 085 and D 070. No wires should be connected to the control during testing.