43
VCCX2 Controller Technical Guide
VCC-X EM1 Expansion Module
The VCC-X EM1 Expansion Module connects to the VCCX2
Controller with an E-BUS cable and adds an additional: five
analog inputs, five analog outputs, three binary inputs, and five
configurable relay outputs.
The VCC-X EM1 Expansion Module can be used in conjunction
with the E-BUS 12 Relay Expansion Module. The expansion
modules can be used individually or together to provide the
required inputs and outputs for your specific applications.
Entering Water Temperature Sensor
The Entering Water Temperature Sensor is a 10K ohm Type III
thermistor sensor. The Entering Water Temperature Sensor should
be mounted in the entering water piping.
Return Air Plenum Pressure Sensor
The ASM01832 Return Air Plenum Pressure Sensor (also used
as a Building Static Pressure Sensor, as shown on
page 33
)
must be wired as shown in
Figure 24, this page
. There are three
terminal connections on the Pressure Sensor. Connect 24 VAC to
the terminal labeled “+ EXC.” Connect the GND terminal on the
EM1 Expansion Module terminal block to the terminal labeled
“- COM.” Connect the remaining terminal labeled “OUT” to
SIG1 on the EM1.
+ EXC
- COM
Tubing to RA
plenum pressure
sensing location
Tubing to
atmospheric
sensing location
Return/Exhaust
Proof of Flow
Switch
Connect to
VCCX2 Controller
Connect to
Expansion Module(s)
(when used)
Figure 24: Entering Water Temperature Sensor, Return Air Plenum Pressure and
Return/Exhaust Proof of Flow
WIRING
Entering Water Temp Sensor, RA Plenum, and Return/Exhaust Proof of Flow
WARNING:
It is very important to be certain that all
wiring is correct as shown in the wiring
diagram below. Failure to observe the
correct polarity will result in damage to the
VCCX2 Controller or Return Air Plenum
Pressure Sensor.