tekmar 704 Mixing Station - Manual (Page 9)

9 of 16 © 2005 D 704 - 04/05
STEP TWO - INSTALLING THE SENSORS
Outdoor Sensor
Note: The temperature sensor is built into the plastic enclosure.
If the Mixing Station 704 is to be used in the outdoor reset mode, the Outdoor Sensor must
be installed. If the Mixing Station 704 is to be used in either the setpoint or a delta T mode,
the Outdoor sensor is not required and does not need to be installed. (See pages 5 to 7 for a
complete description of the available modes.)
• Remove the screw from the center of the sensor and pull the front cover off of the sensor.
• The outdoor sensor can either be mounted directly to an outside wall or onto a standard
electrical box. Wiring can enter the sensor either through the bottom or the back of the plastic
enclosure.
• The sensor should be mounted on a wall which best represents the heat load on the build-
ing (i.e. a north facing wall for most buildings and a south facing wall for building with a large
south facing glass area). The sensor should not be installed near heat sources such as exhaust
vents or window openings.
• The sensor should be installed at an elevation above the ground that will prevent accidental
damage or tampering.
• Ensure that the sensor is installed in a sheltered location out of direct sunlight and rain.
• Connect a two conductor wire to the terminal block in the Outdoor Sensor and run the wires
from the Outdoor Sensor back to the Radiant Mixing Control’s location.
Installing the System and Boiler Sensors
Note: These sensor are designed to be mounted on a pipe or in a temperature well.
• These sensors can be strapped directly to the pipe using the cable tie provided with the sen-
sors. Insulation should be installed around the sensors to reduce the effect of air currents on
the temperature measurement. Care should be taken not to over-tighten the cable tie as this
can cause damage to the sensor.
• The System Supply Sensor 082 is to be installed on the System Supply pipe. This sensor is
required at all times.
• If a Boiler Sensor 071 is used, install the boiler sensor on either the boiler supply or the boiler
return. Ensure that the DIP switch on the back of the circuit board of the RMC is set to ON
if the sensor is installed on the boiler supply and set to OFF if the sensor is installed on the
boiler return. If boiler control and boiler protection are not required in the application, the boiler
sensor does not need to be installed.
• If a System Return Sensor is to be used, install the sensor on the system return pipe. This
sensor is only required if the RMC is operating in the Delta T mode.
STEP THREE - WIRING THE RMC
• Before wiring the control, ensure that power to all circuits is off.
• Ensure that all wires are stripped to a minimum of 3/8” (9 mm) in order to ensure proper connection to the low voltage terminals.
• Provide a separate circuit with a minimum 15 A capacity in order to insure proper operation.
Wiring Power to the RMC
Using the supplied line cord, connect the white wire with the 1/4 inch (6 mm)
female spade connector to the 1/4 inch (6 mm) male spade connector labelled
“N” on the back of the RMC circuit board. Connect the black wire with the 1/4
inch female spade connector to the 1/4 inch (6 mm) male spade connector
labelled “H” on the back of the RMC circuit board. Connect the green wire to
the ground screw located on the casting of the Mixing Station 704.
Wiring to the Mixing Station 704
Wiring to the Injection Pump
Connect the variable speed injection pump’s three pin molex connector
from the Mixing Station 704 to the matching three pin molex connector
labelled “Var” on the back of the RMC circuit board.
Wiring the Mixing Station 704 System Pump
Connect the system pump’s four pin molex connector from the Mixing
Station 704 to the matching four pin molex connector labelled “Sys” on
the back of the RMC circuit board.