AERCO C-More Controls Manual June 2010 - Manual (Page 62)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
Page 62 of 162 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 04/22/14
GF-112 Phone: 800-526-0288 OMM-0032_0E
5.2.2 Air Sensor In
The AIR SENSOR IN is connected to the AUX SENSOR IN and SENSOR COMMON terminals
on the I/O board. The AIR SENSOR measures the temperature of the air input to the Air/Fuel
Valve. This temperature reading is one of the components used to calculate the rotational speed
of the blower motor in the Combustion Calibration process.
The AUX SENSOR IN terminals can be used to add an additional temperature sensor for
monitoring purposes. This input is always enabled and is a view only input that can be seen in
the Operating Menu. The sensor must be wired to the AUX SENSOR IN and SENSOR
COMMON terminals. It must be similar to AERCO BALCO wire sensor P/N 123449. A
resistance chart for this sensor is provided in Appendix C.
5.2.3 Analog In
The ANALOG IN + and – terminals are used when an external signal is used to drive the valve
position (Direct Drive Mode - Boiler Only) or change the setpoint (Remote Setpoint Mode) of the
unit.
Either a 4 to 20 mA / 1 to 5 VDC or a 0 to 20 mA/ 0 to 5 VDC signal may be used to vary the
setpoint or valve position. The factory default setting is for 4 to 20 mA / 1 to 5 VDC, however this
may be changed to 0 to 20 mA / 0 to 5 VDC using the Configuration Menu described in Sections
2 and 3. If voltage rather than current is selected as the drive signal, a DIP switch must be set
on the PMC Board located inside the Control Box. Refer to Appendix D for information on
setting DIP switches.
All supplied signals must be floating (unground-ed) signals. Connections between the source
and the unit’s I/O Box must be made using twisted shielded pair wire of 18 – 22 AWG, such as
Belden 9841(see Fig. 5-1). Polarity must be maintained and the shield must be connected only
at the source end and must be left floating (not connected) at the unit’s I/O Box.
Whether using voltage or current for the drive signal, they are linearly mapped to a 40°F to 240°F
setpoint or a 0% to 100% valve position. No scaling for these signals is provided.
5.2.4 B.M.S. (PWM) In
NOTE
Only BMS Model 168 can utilize pulse width modulation, not the
BMS II and ACS.
These terminals are used to connect the AERCO Boiler Management System (BMS Model 168) to
the unit. The BMS Model 168 utilizes a 12 millisecond, ON/OFF duty cycle. This duty cycle is Pulse
Width Modulated (PWM) to control valve position rate. A 0% valve position rate = a 5% ON pulse
and a 100% valve position rate = a 95% ON pulse.
5.2.5 Shield
The SHIELD terminals are used to terminate any shields used on sensor wires connected to the
unit. Shields must only be connected to these terminals.