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SH-VT200C Rev G
Three-step FAN
control method
Relay output
CO
2
+ Temperature
integrated
control type
Proportional
control
CO
2
=> FAN
Temp.=> heater
Humidity=>humidifier
1. CO
2
+ Temperature setting : 3-step FAN control.
(internal electrical contacts type)
CO
2
Relay electrical contact : Low Speed
Temp. Relay electrical contact : Middle Speed
Humidity Relay electrical contact : High Speed
2. CO
2
+ Temperature setting : 3-step FAN control.
(External electrical contacts type)
CO
2
Relay /electrical contact : Low Speed
Temp. cooler Relay /electrical contact :
: Middle Speed
Temp. Heater Relay/ electrical contact
: High Speed
3. At the 3-step FAN control, ON/OFF gap is as below
CO
2
: setting value 50ppm,
Temperature : setting value 0.5
4. Humidity only can be displayed in the 3-step FAN control
mode.
1. Ventilation proportional control (CO2) :
[1, OF] value = setting value
[1, ON] value = proportional bandwidth.
According to setting time of proportional control mode,
Device will control the output comparing with detected
value.
Ex) CO
2
ON = 1500, CO
2
OFF = 1000, Time = 60 seconds,
CO
2
relay output time will be 0”at 1000ppm.
and CO2 relay output time will be 60 seconds at
1500ppm.
If detected value of CO
2
is 1300ppm, then the FAN
will be ON for 36 seconds(60% of60 seconds) and OFF
for 24seconds repeatedly.
14


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