Bell-gossett P86271B Variable Speed NRF-VS Control with setpoin Manual de usuario descargar pdf (Pagina 7)

POWER UP SEQUENCE

At initial power up, the NRF-VS will run at full speed for 5

seconds. It will then run at low speed for 5 seconds, before

adjusting to the appropriate speed. Monitor the pump at initial

power up. If the pump does not operate as indicated above,

the Gain (DIP Switch 4) can be adjusted to On (Fast) to

increase the minimum power setting.

OUTPUT LIGHTS

The NRF-VS cover has 6 LED lights to indicate operation and

faulty status.

THE GREEN OUTPUT LIGHT

Represents power to the NRF-VS. When constantly On, the

control is powered.

THE RED OUTPUT LIGHTS

Represent pump speed in increments of 20%. If only one Red

light is on, the pump speed is equal to or below 20%. If 2 Red

lights are On, the pump speed is equal to or below 40%.

When 3 Red lights are On, the pump speed is equal to or

below 60%. When 4 Red lights are On, the pump speed is

equal to or below 80%. When all Red lights are On, the pump

is running from 80% to full speed.

FLASHING LIGHTS

• This indicates an error in the input signal. If NRF-VS is set

to 4-20mA/2-10V, the signal must be below 0.5mA or

0.25V. Check input signal and wiring.

• If NRF-VS is set to Set Point, the sensor has fault status,

either shorted or opened. Check sensor wires and Ohm

reading against sensor temperature chart.

PERIODIC INSPECTION

Bell & Gossett products are designed to provide years of

trouble free service. It is recommended that periodic inspec-

tions be made to check for potential problems with the pump

and control. If any leakage or evidence of leakage is present,

repair or replace the unit.

TEMPERATURE Value

(in Degrees ºF) (in 0hms)

30 17264

35 14985

40 13040

45 11374

50 9944

55 8714

60 7653

70 5941

80 4649

90 3667

100 2914

110 2332

120 1879

130 1524

140 1243

150 1021

160 842

170 699

180 583

190 489

200 412

210 349

220 297

230 253

WARNING: The NRF-VS is an operating control only.

The boiler must have all safety and limit controls

required by code. It is the responsibility of the installer to

verify that all the safety and limits are working properly

before and after the NRF-VS is installed. Failure to follow

these instructions could result inserious personal injury,

death and/or property damage.

TEMPERATURE

SENSOR CHART

1 2 3 4 5 6 7 8

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Bell-gossett P86271B Variable Speed NRF-VS Control with setpoin Manual de usuario Pagina 7

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