MC2: 10/03/12 Page
39
of
90
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
GF-115-H
OMM-0083_0B
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 7: Boiler
Operation
Combustion Calibration Procedure
1. Refer to
Figure 7-3
(previous page) and locate the Outlet Pressure Tap
for the gas valve of the first
boiler stage. This outlet features a screw operated needle valve in the tap to open and close it.
2. Turn the screw of the Outlet Pressure Tap1/2 turn
counterclockwise
to open the tap.
3. Attach the plastic tubing between the Outlet Pressure Tap
and the manometer.
4. Open the water supply and return valves of the boiler and ensure that the system pumps are running.
5. Ensure that the external gas supply valve to the boiler is open.
6. Set the ON/OFF switch on the front of the boiler to the ON position.
NOTE
When performing the remaining steps in the combustion calibration
procedure, refer to
Sections 1
and
2
in Modulex E8 Controller Operation
& Wiring Guide
GF-115C
for locations and descriptions of the controls
and display on the controller.
7. With the controller hinged panel
closed
, turn the Rotary Knob clockwise and monitor the displayed
symbols on the lower portion of the display. The symbols will increment from left to right and show the
appropriate symbols (see
Figure 7-2
):
Standby/OFF
,
AUTO MODE 1
,
AUTO MODE 2
,
SUMMER
MODE
,
DAY MODE
,
NIGHT MODE
and finally,
SERVICE MODE
. The
SERVICE MODE
symbol
appears as follows at far right of display:
8. With the above symbol displayed, open the swing-down hinged panel of the controller.
INSTALLATION
will then be displayed.
9. Next, turn the Rotary Knob counterclockwise until
SERVICE
appears in the display.
10. With
SERVICE
displayed, press the Program Key on the controller.
NOTE
The
CASCADE MANU
(Cascade Manual) mode will time out after a
period of 15 minutes. When this occurs, the boiler will revert the Auto
mode and will function under program control. If this occurs prior to
completing the combustion calibration for each boiler stage, it will be
necessary to repeat
steps 7
through
15
and then sequence the boiler
stage to the one which was in-process when the time out occurred.
11. Turn the Rotary Knob clockwise until
CASCADE MANU
is displayed.
12. Press the Program Key.
BOILER 1
will be displayed.
13. Press the Program Key again. The display will show
CODE NO.
, requesting the valid code to be
entered.
14. Enter code
0000
(4 zeros) by pressing the Program Key four times. The red LED will remain lit while
the four code digits are entered. The LED will turn off after the last code digit is entered.
15. With
BOILER 1
displayed, press the Program Key. The red LED will light.
16. Turn the Rotary Knob clockwise and select a fire rate of 10%. Press the Program Key to store the
setting.
17. Wait until the first boiler stage fires and stabilizes at the 10% fire rate.
18. Insert the combustion analyser probe into the 3/8” hole in the flue. Allow enough time for the
combustion analyser to settle.
(Continued)
