AERCO C-More Controls Manual June 2010 - Manual (Page 67)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 67 of 162
OMM-0032_0E Phone: 800-526-0288 GF-112
Remote Setpoint Field Wiring
The only wiring necessary for the Remote Setpoint modes is the external control wiring from the
source, to the ANALOG IN terminals on the terminal strip inside the I/O Box. The I/O Box is
located on the left side of the KC Series units and on the front of Benchmark Series units. Refer
to the wiring diagram (Figure 5-1) provided on the cover of the I/O Box. For a Network setting,
the connections are made at the RS-485 COMM terminals in the I/O Box. The signal must be
floating (ungrounded), and the wire used must be a two wire shielded cable of 18 to 22 AWG.
Polarity must be observed and the source end of the shield must be connected at the source.
When driving multiple units, each unit’s wiring must conform to the above.
Remote Setpoint Startup
Since this mode of operation is factory preset and the setpoint is being externally controlled, no
startup instructions are necessary. In this mode, the REMOTE LED will light when the external
signal is present.
To operate the unit in manual mode, press the AUTO/MAN switch. The REMOTE LED will go
off and the MANUAL LED will light.
To change back to the Remote Setpoint mode, simply press the AUTO/MAN switch. The
REMOTE LED will again light and the MANUAL LED will go off.
NOTE
The modes of operation described in paragraphs 5.3.3 through
5.3.6 apply ONLY to KC and Benchmark Series boilers. External
wiring connections for these modes are made at the Input/Output
(I/O) Box which is located on the left side of KC Series units and
on the front of Benchmark Series units.
5.3.3 Indoor/Outdoor Reset Mode
This mode of operation is based on outside air temperatures. As the outside air temperature
decreases, the supply header temperature will increase and vice versa. For this mode, it is
necessary to install an outside air sensor as well as select a building reference temperature and
a reset ratio.
Reset Ratio
Reset ratio is an adjustable number from 0.1 to 9.9. Once adjusted, the supply header
temperature will increase by that number for each degree that the outside air temperature
decreases. For instance, if a reset ratio of 1.6 is used, for each degree that outside air
temperature decreases, the supply header temperature will increase by 1.6 degrees.
Building Reference Temperature
This is a temperature from 40°F to 230°F. Once selected, it is the temperature that the system
references to begin increasing its temperature. For instance, if a reset ratio of 1.6 is used, and
we select a building reference temperature of 70°F, then at an outside temperature of 69°F, the
supply header temperature will increase by 1.6° to 71.6°F.