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JETVENT CAR PARK IMPULSE VENTILATION
© FANTECH
2016
JETVENT ANALOGUE CONTROL SYSTEMS
F-14
F
Methods of controlling an
analogue system
An analogue system comprises of impulse fans that incorporate AC motors.
There are two ways of controlling these fans.
Two speed JetVent Fans
Using relays to drive contactors connected to the fans.
Main Exhaust
Fan
CO/NO
Sensors,
up to 22
Variable
Speed
Drive
Output
Input
Key
Main Supply
Fan
Variable
Speed
Drive
Relays
High/Low
Speed
x
EcoVent
Zone
Controller
Applicable Fans Series: JV-CPA, JIU-CPMF, JIU-CPC2, JISU-CPC
100
90
80
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
CO Concentrations (ppm)
1
Stepped approach
(ie. High/low speed )
Two-speed control involves setting the fans to off,
low or high speed with a two-speed motor and relays.
The relays are switched by the controller and in turn
power contactors to the motor windings. The relays are
switched at various set points corresponding to sensor
readings in the car park. This is a simple and low cost
way of achieving basic speed control of JetVent fans
in a car park.