AERCO C-More Controls Manual June 2010 - Manual (Page 63)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 63 of 162
OMM-0032_0E Phone: 800-526-0288 GF-112
5.2.6 mA Out
These terminals provide a 4 to 20 mA output that can be used to monitor setpoint ( 40°F to 240°F),
outlet temperature (30°F to 245°F), or valve position (0% to 100%). This function is enabled in the
Configuration Menu (Table 2-3).
5.2.7 RS485 Comm
These terminals are used for RS485 Modbus serial communication between the unit and an
external “Master”, such as an Energy Management System, Boiler Automation System, or other
suitable device.
5.2.8 0 – 10V Output
These terminals provide a 0 to 10 volt output used to directly drive the blower motor. In unit
sizes 3.0 MBTU and above, these terminals connect to a Variable Frequency Drive (VFD) which
in turn connects to the blower motor.
5.2.9 Exhaust Switch In
These terminals permit an external exhaust switch to be connected to the exhaust manifold of the
unit. The exhaust sensor should be a normally open type switch (such as AERCO P/N 123463) that
closes (trips) at 500°F.
5.2.10 O2 Sensor (O2+, O2-)
These terminals (O2+ and O2-) provide a connection for the O2 (oxygen) sensor.
5.2.11 Flow Meter (Flw+, Flw-)
These terminals (Flw+ and Flw-)) provide a connection for an external Flow Meter with any of
the following outputs:
• 0-5 Volts
• 1-5 Volts
• 0-20 milliamps
• 4-20 milliamps
NOTE
The Flw+ and Flw- terminals are also used to connect a Spark
Detector module to the C-More controller. If the Spark Detector is
connected to the Flw+ and Flw- terminals, DIP Switch S1-3 must
be set to OFF (Volt) Position (see detail “A” in Figure D-1 in
Appendix D).
5.2.12 RS-232 Serial (TxD, RxD)
These terminals provide a connection to the RS-232 Serial communications port. To utilize the TxD
and RxD terminals, DIP Switch SW1 (RS-232 on the I/O board) must be set to the ON position.
5.2.13 Interlocks
The unit offers two interlock circuits for interfacing with Energy Management Systems (EMS) or
Building Automation System (BAS) and auxiliary equipment such as pumps or louvers. These
interlocks are called the Remote Interlock and Delayed Interlock. The wiring terminals for these
interlocks are located inside the I/O Box. The I/O Box cover contains a wiring diagram (Figure 5-1)
which shows the terminal strip locations for these interlocks which are labeled REMOTE INTL’K IN
and DELAYED INTL’K IN. Both interlocks, described below, are factory wired in the closed position.