AERCO Control System (ACS) - Manual (Page 78)

MC2: 04/23/13 Page 78 of 144
GF-131
AERCO Control System (ACS)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
Installation, Operation, and Maintenance Manual
OMM-0081_0D
4.8 Testing the System
The following procedure places a load on the system and will begin firing the boilers. At this
point it is very important to make sure the system pumps are running. After system has been
initialized as described in paragraph 4.5, proceed as shown in Instruction 4.8 on next page:
IMPORTANT!
Prior to performing these tests, view and record the PRESENT settings
stored in the ACS for HEADER SET MODE and INTERNAL SETPT. These
settings are located in the Field Adjust Menu and MUST be restored to
these values upon completion of following tests.
NOTE
On a cold start up, if the system is designed with a return temperature sensor
with the intent to activate the plant Delta-Temperature (Delta-T) Limit
function, consider disabling the return sensor. During a cold start, the cold
water may be cold enough to trip the High Delta-T alarm and shut down the
plant. In this case you can set the Return Sensor Mode to OFF to temporarily
disable the Plant Delta-T function and then set it to NORMAL after the return
water has warmed up.
Testing a System with C-More Controls
1. Turn off the ACS by pressing the ON/OFF key. The ON LED will turn off.
2. Using the MENU key, select the FIELD ADJUST MENU and scroll to the HEADER SET MODE
option, The second line of the display will show the current setting stored in memory
(CONSTANT SETPT, OUTDOOR RESET,or REMOTE SETPT).
3. If CONSTANT SETPT is not currently selected, press the CHANGE key. Select the CONSTANT
SETPT mode using the ▲ or ▼ arrow key. When selected, store the change by pressing the
ENTER key.
4. Next, scroll to the INTERNAL SETPT menu option. The second line of the display will show the
current Internal Setpoint temperature (°F) stored in memory.
5. Press the CHANGE key. Set the INTERNAL SETPT temperature to 180°F using the ▲ and ▼
arrow keys. When set, store the change by pressing the ENTER key.
6. Turn on the ACS by pressing the ON/OFF key. The ON indicator will light and the boiler plant will
start to operate.
7. Using the MENU key on the ACS, scroll to the OPERATING MENU. The first line of the display
will show the Header Temperature. The second line of the display will show the Firing Rate %
and the number of Units (boilers) firing.
8. When all boilers have reached at least a 55% firing rate, any boilers that have not started have
not been identified by the ACS.
9. Remember that in the Sequential mode, the ACS turns boilers on in 30-second intervals.
Therefore, in a 6-boiler plant, with five boilers operating at 55% capacity, a boiler that has not
started after 3 minutes has not been recognized. In parallel mode, all boilers will start at the
same time.
10. This completes the System Test. Return the HEADER SET MODE and INTERNAL SETPT
settings to their previously stored values.
11. If the System Test is not completed successfully, refer to the troubleshooting procedures in this
manual ( Chapter 5) and the applicable O & M Manuals for the boilers included in the boiler
plant. If the problem can still not be resolved, contact AERCO at 1-800-526-0288.