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Installation
F i e l d w i r i n g :
C o n t r o l i n p u t
Connect control input signal wiring by inserting wires into
Terminal P11 (labeled 24vdc, RH, and ground) per the wiring
diagram on the next page. Tighten screws; maximum torque is
3 in-lb (0.34 N-m).
Allowed inputs at Terminal P11 include:
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Transmitters provide a signal proportional to the RH or dew
point being measured. All transmitters provided by
DRI-STEEM are two-wire devices using a 4 to 20 mA signal.
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Demand signals are sent to the Vapor-logic4 board from another
control system such as a building automation system. These
systems have their own RH or dew point transmitters, calculate
required humidifier output, and send a demand signal to the
humidifier to create steam at a percentage of that humidifier’s
capacity. Demand signals are typically 0-10 VDC or 4-20 mA,
but may also come from a DDC signal via Modbus, BACnet, or
LonTalk.
A
humidistat
also delivers a demand signal to the humidifier,
but it is not typically used with Vapor-logic4.
Humidistats provide either on-off control or modulating control.
DRI-STEEM humidistats are powered by a 24 VDC supply
provided by the Vapor-logic4 control board.
When using modulating control, the signal from a humidistat
directly controls the amount of output from the humidifier.
Notes:
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operation, see the control input signals section in the Appendix.
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information about LonTalk, BACnet, or Modbus control input
signals.
Figure 12-1:
Terminal P11
Terminal P11:
24
VDC
= Power to space RH sensor
RH = Space RH input (RH transmitter, dew point
transmitter, humidistat, or demand signal by
others) (4-20 mA or 0-16 (typ. 0-10) VDC input
= Ground for demand signal by others
Terminal P11
Note:
If you do not know which control
components were ordered with your system,
contact DRI-STEEM or connect your keypad/
display to the Vapor-logic4 board per the
instructions on Page 17. Go to the Setup
menu per the instructions on Page 24 to
view system parameters that were factory
configured as ordered.
Содержание Vapor-logic 4
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