7
CONTROL INSTALLATION
MOUNTING THE CONTROL
• The VSP is designed to mount on a 1900 (4”x4”) electrical box.
• If the VSP is to be panel mounted, or if additional room is needed for wiring, an extension kit is available (HT #908520).
• Locate the VSP in a convenient location near the variable speed pump. The VSP can not be mounted more than 500'
from any sensor location.
• Mount the VSP away from excessive heat or cold. Ambient operating temperature is from 20 to 120°F.
• After completing all the wiring connections (see opposite page) use the two screws provided to mount the VSP to the
1900 box.
INSTALLING THE SENSORS
• All three sensors are interchangeable.
• The sensor wires can be extended up to 500' from the controller by splicing with shielded two conductor 18 gauge
wire.. Do not connect the shield at the sensor end. Do not run wires in conduit with line voltage.
• The Secondary loop sensor should be inserted in the well as described on pg. 2.
• The Boiler return water sensor, if used, should be inserted in the well as described on pg. 2.
• The Outdoor sensor should be mounted in the shade on the north side of the building (never in direct sunlight). Keep
the sensor approximately 10' above ground level and away from doors, windows, exhaust fans, or other heat sources.
WIRING THE SENSORS
• The sensor wires have no polarity. Either wire from a sensor can be connected to the appropriately marked VSP screw
terminal (see pg. 11) or the sensor common marked
COM
.
• Either or both screw terminals marked
COM
can be used as the sensor common. They are interchangeable.
• If the sensor wires have been extended, connect the shield to a
COM
terminal.
• The two wires from the Secondary loop sensor must be connected to the VSP front screws marked
SEC
and
COM
.
• The two wires from the Outdoor sensor must be connected to the VSP front screws marked
OUT
and
COM
.
• The two wires from the Boiler return water sensor, if used, must be connected to the VSP front screws marked
RTN
and
COM
. (If not using this sensor, see the
NOTE
in Low Return pg. 13).
WIRING THE VSP POWER
• Attach 120VAC line voltage to the two Blue wires extending from the back of the VSP.
• Use wire nuts, or wrap the connections with electrical tape.
• Class 1 voltages must enter the 1900 box through a different opening from any Class 2 wiring.
WIRING THE INJECTION PUMP
• The Red wires provide a solid state switching output to the Injection pump.
• The Injection pump motor must be a fractional horsepower permanent split capacitor type motor.
• The output is designed for AC power only. The maximum rating for the injection pump output is 3A 1/4HP.
• The Red wires must be directly in series with the pump power (see pg. 6). The signal can not be wired through any
pilot duty relays or pump starters.
• Safety limit switches or HOA switches must be wired in series with the pump power.
• Use wire nuts, or wrap the connections with electrical tape.
• Class 1 voltages must enter the 1900 box through a different opening from any Class 2 wiring.
Warning:
This Heat-Timer
control is strictly an operating control; it should never be used as a
primary limit or safety control. All equipment must have its own certified limit and safety controls
required by local codes. The installer must verify proper operation and correct any safety problems
prior to the installation of this Heat-Timer control.