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12
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Step 1 – Field wiring:
Terminal P11:
21vdc = Power to space RH sensor
RH = Space RH input (RH transmitter, dew point
transmitter, humidistat, or demand signal
by others (4-20 mA or 0-10) 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
DriSteem or connect your display to the Vapor-
logic board per the instructions on Page 19 .
Go to the instructions on Page 27 to view
system parameters that were factory configured
as ordered .
INSTALLATION
Control input
FIGURE 12-1: TERMINAL P11
Connect control input signal wiring by inserting wires into Terminal P11
(labeled 21vdc, RH, and ground) per the wiring diagram on the next page .
Tighten screws .
Allowed inputs at Terminal P11 include:
•
RH transmitter or dew point transmitter
Transmitters provide a signal proportional to the RH or dew point being
measured . All transmitters provided by DriSteem are two-wire devices using
a 4 to 20 mA signal .
•
Demand signal by others
Demand signals are sent to the Vapor-logic 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-logic .
Humidistats provide either on-off control or modulating control . DriSteem
humidistats are powered by a 24 VDC supply provided by the Vapor-logic
control board .
When using modulating control, the signal from a humidistat directly
controls the amount of output from the humidifier .
Notes:
• See Figure 13-1 .
• For more information about control input signal types and operation, see
• See "Modbus, BACnet, LonTalk interoperability" on page 66 for more
information about input signals .