Conspec Controls P2621-NO2/VC 운영 매뉴얼 - 페이지 2

{카테고리_이름} Conspec Controls P2621-NO2/VC에 대한 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Conspec Controls P2621-NO2/VC 10 페이지. Nitrogen dioxide ventilation fan controller

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I) SYSTEM DESCRIPTION

Conspec's P2621-NO2/VC Nitrogen Dioxide (NO2) Monitor / Ventilation Controller is

designed for use where ventilation fans are installed to prevent the accumulation of

dangerous levels of Nitrogen Dioxide. Nitrogen Dioxide is a toxic byproduct of

combustion and is contained in the exhaust of internal combustion engines. The P2621-

NO2/VC utilizes a programmable micro-Controller combined with a high-quality electro-

chemical Nitrogen Dioxide sensor to measure the NO2 level from 0-20ppm. The P2621-

NO2/VC displays the NO2 level on the built-in LCD display, and activates a fan relay to

ventilate the area when elevated concentrations (1 ppm) of NO2 are detected. The

P2621-NO2/VC's audible alarm sounds if the NO2 level remains at an elevated level (3

ppm) for more than 15 minutes to signal nearby persons to leave the area. The P2621-

NO2/VC continually self-tests the internal electronic circuitry and the sensor, and signals

if a fault is detected. Front-panel LED indicators are provided for "Power", "Fan (ON)",

"Alarm", and "Fail". The P2621-NO2/VC is factory tested and calibrated prior to

shipment. Field calibrations are possible with the optional P1879-NO2 Calibration Kit

and P2621-H handheld programmer module. The P2621-NO2/VC operate on 24VAC

power and consumes less than .15W max.

The P2621-NO2/VC's "Fan" relay is operated in the failsafe mode where the relay coil

is energized whenever the P2621-NO2/VC is in a non-alarm condition and the normally-

open contact (terminal connections K1 & K2) is held closed. When any fault occurs the

"Fan" relay is de-energized and the normally-open contact (terminal connections K1 &

K2) falls open. The "Fan" relay is de-energized at start-up, when the NO2 level rises

above 1ppm, when the internal diagnostics program detects a fault or when AC power to

the unit is lost. The "Fan" relay is re-energized when the fault is cleared. The P2621-

NO2/VC's programming holds the "Fan" relay de-energized for a minimum of three

minutes once activated to prevent short-cycling of the exhaust fans.

The P2621-NO2/VC's optional "Alarm" relay (terminal connections K3 & K4)

operates on the same principle as the internal audible alarm. The audible alarm is

activated only after the NO2 level has exceeded 3ppm for 15 minutes. The audible alarm

(and optional "Alarm" relay) deactivate when the NO2 level drops below 3ppm.

II) POWER REQUIREMENTS

Warning: The use of the P2621-NO2/VC unit with higher or lower voltages can

damage the unit and cause improper operation or a hazardous condition.

The P2621-NO2/VC was engineered to be used with 24VAC power supply and a 24

VAC relay control circuit. The relay contacts are rated 5A@ 24VAC for use with an

inductive load. If the installation requires a higher voltage or greater load capacity,

replace the relay unit with an appropriately rated relay (or use a second relay between the

control relay and the load). Power requirements for each P2621-NO2/VC are 24 VAC at

0.5 amps.