Boiler Operating Control - Harsco Industrial 1004905923 Installation & Owner's Manual

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MODU-FIRE Forced Draft Gas-Fired Boiler 2500-3000
3.10.4 Test of Low Gas Pressure Switch
Manual Reset
Gas Pressure Switch
The boiler is furnished with a low gas pressure switch. This switch must be set at 5" w.c. The operation of this
switch must be checked by slowly closing the main gas cock while the burner is operating. The switch should
shut down the main burner.
3.10.5 Test of High Gas Pressure Switch
The boiler is furnished with a high gas pressure switch. The operation of this switch must be checked by closing
the downstream main gas cock, and starting the boiler. Once the trial for ignition period is reached, the main gas
valve will open, pressurizing the line. This will trip the high gas pressure switch.
The high gas pressure switch must be manually reset after it trips.
3.11

Boiler Operating Control

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The MODU-FIRE Forced Draft boiler is equipped with a combination combustion and temperature control. This
control monitors combustion and lighting of the boiler,
as well as maintaining temperature of the supply
water. The temperature control portion modulates the
boiler to maintain the desired outlet temperature
based on the selected operating configuration.
3.11.1 Initial Adjustments
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control uses a Liquid Crystal Display
The ENVI
(LCD) as a method of supplying information. The
LCD is used to setup and monitor system operation
by means of six push buttons RESET, MENU, BACK,
ENTER, UP & DOWN (Scroll, ▲,▼). Scroll advances
the display, while ▲,▼are used in the adjust menu.
The lighted window in the center is a four line LCD
that shows boiler operating information on various
screens. These screens are shown below with an introduction to the control operating features. For additional
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information, the ENVI control manuals may be obtained from the Harsco Industrial, Patterson-Kelley factory.
3.11.1.1 Operation of the control
The home page is the default screen that is shown upon startup. This screen shows the date, time, boiler status,
supply temperature and setpoint temperature.
The buttons across the bottom are used to navigate through the various screens. Pushing the MENU button
displays a menu of options.
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