E528 Product Guide
Rev 8.0 12/16/2016
6
H1 – External Temperature Control Sensor
H2 – Power Input
H4 – IR Eye 5
H5 – Microprocessor Programming
H6 – PIR Sensor
H7 – Humidity Sensor
H8 – ES1 Key
H9 – Low Voltage Comm/Device Connection
H10 – RF Programming
Input/Output
The I/O headers for the e528.3G* and 4G*
thermostats are substantially
different (see Figure 5 above). The statements and table below detail only the
headers that differ in function.
Low Voltage comm / device connector
: This header accepts the provided 6-
pin harness used to connect low voltage communication, door/window position
switch, and other room devices to the e528. Table 3 shows pinout and function
for the 3G and 4G. For specifics, refer to the as-built wiring diagrams.
* “3G,” and “4G” are internal INNCOM product designations used for convenience to differentiate
individual hardware configurations. No difference in device capability or effectiveness is implied.
Due to end-of-life for certain 3G components, the e528.4G is now the standard INNCOM install,
but 3G installations are still supported.
E528 3G headers
E528 4G headers
10-pin Molex
Socket
Accepts
the 10 pin Molex
plug pre-wired
with 8” color-
coded leads.
Connect to the
HVAC unit’s
power, fan and
valve signals.
10-pin Molex
Socket
Accepts
the 10 pin Molex
plug pre-wired
with 8” color-
coded leads.
Connect to the
HVAC unit’s
power, fan and
valve signals.
H1 – Microprocessor Programming
H3 – External Temperature Control Sensor
H4 – Power Input
H5 – RS485 Network
H6 – ES1 Key
H7 – Low Voltage Comm/Device Connection
H8 – PIR
H9 – IR Eye 5