AERCO C-More Controls Manual June 2010 - Manual (Page 77)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 77 of 162
OMM-0032_0E Phone: 800-526-0288 GF-112
SECTION 6 - CALIBRATION AND DIAGNOSTIC MENUS
6.1 INTRODUCTION
The Level 2 Password (6817) must be entered to access the Calibration and Diagnostic
procedures describe in this Section.
6.2 CALIBRATION PROCEDURES
The items contained in the Calibration Menu shown in Table 2-8 permit the user to set or adjust
a number of functions in the KC and Benchmark Series units. The descriptions and procedures
necessary to implement each of these Calibration Items are provided in the following
paragraphs.
6.2.1 Stepper Feedback Calibration
The Stepper Feedback (Fbk) function checks the calibration of the Air/Fuel Valve Stepper Motor
feedback current. This is accomplished by positioning the Air/Fuel Valve stepper motor at the
0% (fully closed) and 100% (fully open) positions and storing the feedback potentiometer
readings at these settings. It also permits verification of the Stepper Motor Feedback at the 50%
position. The position of the Stepper Motor is verified by visually checking the dial on the
Air/Fuel Valve. In addition, the VALVE POSITION bargraph segments will light to indicate motor
position. To initiate this calibration procedure, proceed as follows:
1. Press the
▲ or ▼ arrow key until Stepper Fbk Cal 0% is displayed.
2. Press the CHANGE key. Stepper Fbk will begin to flash.
3. Press and hold th
e ▼ arrow key and monitor the dial on the Air/Fuel Valve.
4.
Release the ▼ arrow key when the Air/Fuel Valve reaches the 0% (fully closed)
position, but is not pressing against the stop. Momentarily tap the ▲ arrow key a few
times to ensure it is not contacting the stop.
5. Press the ENTER key. Cal 100% will be displayed.
6.
Press and hold the ▲ arrow key and monitor the dial on the Air/Fuel Valve.
7.
Release the ▲ arrow key when the Air/Fuel Valve reaches the 100% (fully open)
position, but is not pressing against th
e stop. Momentarily tap the ▼ arrow key a few
times to ensure it is not contacting the stop.
8. Press the ENTER key. Verify 50% will be displayed and the Air/Fuel Valve will rotate to
the 50% position.
9. Verify that the dial on the Air/Fuel Valve indicates approximately 50%. Press ENTER to
confirm.
10. Press BACK to exit the Stepper Fbk Calibration.
6.2.2 PWM In Adjustment.
The Pulse Width Modulation (PWM) Input Adjustment is used when the unit is being controlled
by a Boiler Management System (BMS). This Calibration procedure allows the PWM duty cycle
to be varied ±5.0% in 0.1% increments. The nominal PWM duty cycle is 12 milliseconds where:
a 5% pulse ON time = a 0% valve position and a 95% pulse ON time represents a 100% valve
position. To adjust the overall PWM duty cycle, proceed as follows: