AERCO C-More Controls Manual June 2010 - Manual (Page 61)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 61 of 162
OMM-0032_0E Phone: 800-526-0288 GF-112
SECTION 5 - INPUT/OUTPUT INTERFACES &
OPERATING MODES
5.1 INTRODUCTION
This Section provides descriptions of the Input/Output (I/O) wiring connections which can be
made at the Input/Output (I/O) Box included with the C-More Control Panel. For KC Series units,
the I/O Box is located on the left side of the unit. For Benchmark Series units, the I/O Box is
located on the front of the unit behind the door.
Also included in this Section are descriptions of the available operating modes which can be set
up for water heaters and boilers utilizing the C-More menus.
5.2 I/O INTERFACES
All wiring connections are made at the terminal strips contained in the I/O Box. The I/O Box
cover contains a connection diagram as shown in Figure 5-1. Refer to this diagram when
making all field wiring connections to the I/O Box. The connections shown in Figure 5-1 are
described in the following paragraphs.
NOTE
Older I/O PCBs are wired the same as new ones, even if silk-
screen designations differ.
CAUTION!
DO NOT make any connections to the I/O Box terminals labeled
“NOT USED”. Attempting to do so may cause equipment damage.
5.2.1 Outdoor Sensor In
An outdoor air temperature sensor (AERCO Part No. 122790) will be required mainly for the
Indoor/Outdoor Reset Mode of operation for boilers. It can also be used with another mode if it
is desired to use the outdoor sensor enable/disable feature. This feature allows the boiler to be
enabled or disabled based on the outdoor air temperature. The factory default for the outdoor
sensor is DISABLED. To enable the sensor or choose a system start temperature, see the
Configuration Menu in Table 2-3.
The outdoor sensor may be wired up to 200 feet from the boiler. It is connected to the
OUTDOOR SENSOR IN and SENSOR COMMON terminals in the I/O Box (see Figure. 5-1).
Wire the sensor using a twisted shielded pair cable of 18-22 AWG wire. There is no polarity to
observe when terminating the wires. The shield is to be connected only to the terminals labeled
SHEILD in the I/O Box. The sensor end of the shield must be left free and ungrounded.
When mounting the sensor, it must be located on the North side of the building where an
average outside air temperature is expected. The sensor must be shielded from direct sunlight
as well as impingement by the elements.
If a shield is used, it must allow for free air circulation.