16
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Ter
minal P13
Terminal P13:
21vdc = Power to duct high limit switch or
transmitter
DHL = Duct high limit switch/transm . (4-20 mA
input)
24vac = Power to airflow proving switch
AFsw = Airflow proving switch (24 VAC input)
INSTALLATION
J402
Terminal P20
Step 1 – Field wiring: Limit controls
FIGURE 16-1: TERMINAL P13
AIRFLOW PROVING SWITCH
Connect wiring for a duct airflow proving switch or Space Distribution Unit
(SDU) airflow proving switch by inserting wires into the terminal block plug
at P13 (labeled AFsw and 24vac) per the wiring diagram on the next page .
Tighten screws; maximum torque is 3 in-lb (0 .34 N-m) . (An SDU is a cabinet
fan dispersion assembly .)
See also “Sensor placement” on Page 26 .
DUCT HIGH LIMIT SWITCH OR TRANSMITTER
Connect wiring for a duct high limit switch or transmitter by inserting wires
into the terminal block plug at P13 (labeled DHL and 21vdc) per the wiring
diagram on the next page . Tighten screws .
Note: The duct high limit sensor connected at this location can be an on-off
high limit switch, or it can be a duct high limit transmitter with an adjustable
high limit set point (4-20 mA input) .
See also “Sensor placement” on Page 26 .
MASTER ENABLE INPUT
Connect wiring for an enable/disable dry-contact signal by inserting wires into
the terminal block plug at P20 (labeled MASTER ENB) . Tighten screws . Remove
shunt on J402 if wiring is installed .
If an enable signal is not being used, jumper the MASTER ENB terminal block
plug at P20 or attach the included shunt to the two pin header at J402 .
