Dip switch settings – Bell & Gossett P86271B Variable Speed NRF-VS Control with setpoint or external signal follower User Manual

Page 5

Make the electrical connections according to the wiring
diagram provided (See Fig. 4). Route the power wiring
through one of the

" diameter holes in the steel conduit

box. The control or sensor wiring must pass through the

" diameter hole in the plastic enclosure.

9. Attach 120VAC line voltage to the orange wire extending

from the back of the NRF-VS. Wire the neutral wire to
either of the orange wires extending from the back of the
NRF-VS.

WIRING THE SENSORS FOR SETPOINT CONTROL

•

Sensor terminals are located on the back of the NRF-VS
control board.

• To set the NRF-VS for use with a temperature sensor, set

Dip Switch 1 to On.

• Pass the sensor wiring through the

" hole in the plastic

enclosure. Low voltage wiring must be separated from
power wiring.

• The sensor wires have no polarity. Connect either wire from

the sensor to terminals 2 and 3. (See Fig. 5)

• Sensors are typically installed on the secondary loop. (See

Fig. 2)

• On a sensor failure or short the pump will run at full speed

and LED Lights will blink indicating a fault status.

WIRING THE EXTERNAL SIGNAL INPUT

4-20MA OR 2-10V

•

External signal terminals are located on the back of the
NRF-VS control board. (See Fig. 6).

• To wire the NRF-VS for use with an external signal either

4-20mA or 2-10V, set Dip Switch 1 to Off.

• The NRF-VS DOES NOT source current for the signal. The

current must be supplied by the control or system
supplying the signal.

• Pass the sensor wiring through the

" hole in the plastic

enclosure. Low voltage wiring must be separated from
power wiring.

• Polarity is important when using an External Signal. Always

connect the common to terminal 2 while the signal side is
connected to terminal 1.

• On a signal error the pump will fully stop and LED Lights

will blink indicating a fault status.

• When using 4-20mA input signal, make sure the input

source can supply at least 10V.

• When using 2-10V input signal, make sure the input source

can supply at least 20mA.

DIP SWITCH SETTINGS

Dip Switch 1 (Input Mode 4-20mA/2-10V or Setpoint)

1=Off (4-20mA/2-10V), 1=On (Setpoint)

Default 1=Off

•

This control can vary the pump speed based on either an
External Signal of 4-20mA/2-10V or a Temperature
Setpoint.

WARNING: ELECTRICAL SHOCK HAZARD
Electrical connections are to be made by a qualified

electrician in accordance with all applicable codes, ordi-
nances and good practies. Failure to follow these instruc-
tions could result in serious personal injury, death and/or
property damage.

CAPACITOR

Black

Orange

Neut

Line

White

Power Switch

Surge Suppressor

Sensor Wiring

Temperature Sensor

External Signal Wiring

External Signal

Common

FIG. 4

FIG. 5

FIG. 6

Dip Switches

4-20mA
2-10V

Setpoint

Input Mode Setting
Dip Switch 1