7
PREHEAT-X Technical Guide
Inputs
The PREHEAT-X works as a stand-alone module or comm-
unicating with the VCCX2 or other AAON unit controllers. For
connection to the PREHEAT-X use an E-BUS Cable connecting
to the appropriate E-BUS ports. The Reset Input and Heat Enable
are only used in Stand-Alone Mode. See
Figure 2
,
this page
for
the Inputs Wiring Diagram.
Leaving Air 1
Temperature Sensor
Mount inside
PREHEAT-X box wall
Leaving Air 2
Temperature Sensor
Mount inside
PREHEAT-X box wall
Entering Air
Temperature Sensor
Make splice
connections inside
sensor enclosure
as shown. Seal all
conduit fittings with
silicone sealant.
Mount sensor outdoors
in shaded protected
area and in upright
position as shown.
0-10 VDC
Reset In GND
Heat Enable
Signal (24 VAC)
W1
Note:
Reset In and Heat Enable inputs
are used in Stand-Alone Mode only.
Emergency
Shutdown
AI1
AI2
AI3
RST
GND
GND
BI1
BI2
COM
Size transformer for correct total load.
PREHEAT-X Controller = 11VA
N.C.
SAFETIES
(by others)
GND
18-30
VAC
Line
Voltage
Figure 2: PREHEAT-X Inputs Wiring Diagram
WIRING
Inputs Wiring
