AERCO Modulex General Manual - Manual (Page 39)

INSTALLATION, OPERATION & MAINTENANCE
6-5
6.5.3 Preparing The Flue For Use With The Combustion Analyzer
In order to provide an opening for the combustion analyzer, proceed as follows:
1. Drill a 3/8” hole in the PVC vent pipe, approximately 2 feet above the boiler exhaust manifold.
2. If necessary, adjust the stop on the combustion analyser probe so that it will extend mid-way into
the flue gas flow. DO NOT install the probe at this time.
6.5.4 SUPPLY GAS PRESSURE CHECK & ADJUSTMENT
The optimum gas pressure for the Modulex Boiler is 7.0” W.C. and is used as the desired pressure in
the Combustion Calibration procedures in paragraph 6.5.5. However, it should be noted that the
Modulex Boiler can be safely operated at gas pressures ranging from 4.0” W.C. (minimum) to 14” W.C.
(maximum) as specified in the Gas Supply Design Guide GF-115-G.
An external gas pressure regulator is mandatory for the state of Massachusetts. For all other
jurisdictions, a lock-up style regulator is required when supply gas pressure is greater than 14” W.C.
In order to ensure that the supply gas pressure is adequate for the Modulex installation, the pressure
must be checked under full-fire conditions using the following procedure:
1. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
2. Open the external gas supply valve to the boiler.
3. Measure the gas pressure using the W.C. manometer connected to the inlet gas manifold. If an
external regulator is installed, adjust the pressure to obtain 7.0” W.C. If an external regulator is
not installed, ensure that the supply gas pressure is at least 4.0” W.C.
NOTE
When performing the remaining steps in this procedure, refer to Figures 1 and 2 in
Modulex E8 Controller Operation & Wiring Guide GF-115-C for locations and descriptions
of the controls and displays on the Controller.
4. Set the ON/OFF switch on the front of the boiler to the ON position.
5. With the Controller hinged panel closed, turn the Rotary Knob clockwise and monitor the
displayed symbols on the lower right portion of the display. The symbols will increment from left to
right and show the appropriate symbols for each mode: AUTO MODE 1, AUTO MODE 2,
SUMMER MODE, DAY MODE, NIGHT MODE and finally SERVICE MODE. The SERVICE
MODE symbol will appear at the far right of the display and will look as follows:
6. With the above symbol displayed, open the swing-down hinged panel of the Controller.
INSTALLATION will be displayed.
7. Next, turn the Rotary Knob counterclockwise until SERVICE appears in the display.
8. With SERVICE displayed, press the Program Key on the Controller.