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STEP TWO - INSTALLING THE SENSORS

Outdoor Sensor

Note:

The temperature sensor is built into the plastic enclosure.

If the X – Pump Block is to be used in the outdoor reset mode, the Outdoor Sensor must be
installed. If the X – Pump Block 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 building
(i.e. a north facing wall for most buildings and a south facing wall for buildings 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 and above snow line.
• 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 Heat Source Sensors

Note:

These sensors 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
sensors. 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 is to be installed on the System Supply pipe. This sensor is
required at all times.
• If a Heat Source Sensor is used, install the heat source sensor on either the heat source
supply or the heat source return. E

nsure that the DIP switch on the back of the circuit

board of the VSMC is set to ON if the sensor is installed on the heat source supply and
set to OFF if the sensor is installed on the heat source return.

If heat source control and

heat source protection are not required in the application, the heat source 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 VSMC is operating in the Delta T mode.

STEP THREE - WIRING THE VSMC

• Before wiring the control, ensure that power to all circuits is off.
• Ensure that all wires are stripped to a minimum of

⁄

" (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 VSMC

Using the supplied line cord, connect the white wire with the

⁄

inch female

spade connector to the

⁄

inch male spade connector labelled “N” on the

back of the VSMC circuit board. Connect the black wire with the

⁄

inch

female spade connector to the

⁄

inch male spade connector labelled “H” on

the back of the VSMC circuit board. Connect the green wire to the ground
screw located on the casting of the X – Pump Block.

Wiring to the X – Pump Block

Wiring to the Variable Speed Pump

Connect the variable speed pump’s three pin molex connector from the
X – Pump Block to the matching three pin molex connector labelled “Var”
on the back of the VSMC circuit board.

Wiring the X – Pump Block System Pump

Connect the system pump’s four pin molex connector from the X – Pump
Block to the matching four pin molex connector labelled “Sys” on the back
of the VSMC circuit board.

Com Sup Sys

Ret

Com Boil Out Com Heat

Dem

Var

T1A 250V

Sys

Man

Pmp

Use copper

conductors only

Power: 120 V +/- 10%