6
Main control board connections (cont.)
J23
Wire terminal connection provides optically
isolated connection to air flow proving switch
and safety circuit. Terminal 12 supplies 24 VAC
to proving switch circuit, SPST, which closes
when air flow is present. Terminal 13 is the return
connection from the proving switch into the
VAPOR-LOGIC
®
3
control. Terminal 14 supplies
24 VAC to safety circuit, SPST, which is closed
under normal operating conditions. Terminal 15
is the return connection from the safety circuit
into the VAPOR-LOGIC
3
control.
J25
Wire terminal connector provides input for RTD
tank temperature sensor. Terminal 19 supplies 21
VDC to temperature sensor. Terminal 20 is the
return connection from the temperature sensor
into the VAPOR-LOGIC
3
control. Terminal 18
has no connection.
J26
Wire terminal connector receives the necessary
signal from the controlling RH sensor.
Terminal 21: Positive polarity 21 VDC supply
(25 mA max)
Terminal 22: Control signal
Terminal 23: Signal ground
Input selector pin J17 configures J26 input
Product overview
Main control board connections (cont.).
Product overview:
Main control board connections
J27
Wire terminal connector receives the necessary
signal from the duct high limit RH sensor.
Terminal 24: Positive polarity 21 VDC supply
(25 mA max)
Terminal 25: Control signal
Terminal 26: Signal ground
Input selector pin J18 configures J27 input
J28
Wire terminal connector receives the necessary
signal from the window temperature sensor.
Terminal 27: Positive polarity 21 VDC supply
(25 mA max)
Terminal 28: Control signal
Terminal 29: Signal ground
Input selector pin J19 configures J28 input
VL3-IOM-0301-METRIC.pdf 10
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Summary of Contents for Vapor-logic3
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