Harsco Industrial MODU-FIRE FORCED DRAFT N750, Инструкция по установке и эксплуатации

Страница: 30 / 54

MODU-FIRE® Forced Draft Gas-Fired Boiler
30
NOTICE! Changing parameters requires an understanding of the parameters and the functionality of
the boiler. The boiler may not function properly if parameters are changed from the factory values.
3.12 B
URNER
A
DJUSTMENT
There are no required start-up or field adjustments for air flow control. DO NOT attempt to
change any parameters in the blower speed control (inverter).
The MODU-FIRE® Forced Draft boiler
uses a microprocessor controlled variable frequency inverter to control the speed of the blower. The air flow is set
at the factory. Should an error occur during operation, the inverter will automatically reset after 30 seconds. If the
error recurs, log the flashing error code and call for authorized service.
3.12.1 Combustion Setup and Adjustment
The fuel/air ratio is controlled by the automatic air gas
ratio valve. This valve is adjusted at the factory to give
5.5-6% O
2
at high fire and 7.5-7.9% O
2
at low fire in the
exhaust gas. However, the fuel/air ratio should be
checked using a combustion analyzer at start-up to verify
that the combustion is proper. Remove the vent plug and
place the analyzer probe in the vent as shown. Be sure
to replace the plug after combustion has been set.
Start the boiler. Place the probe of a combustion gas
analyzer in the stack as shown (right). Using the toggle
switch on the boiler control panel, place the boiler in High
Fire. If the % O
2
is not within the range above, the gas
valve should be adjusted.
To adjust the gas valve on hi fire, turn the top screw “V” counterclockwise to reduce the % O
2
or turn it clockwise
to raise the % O
2
. Once high fire is adjusted, place the boiler in low fire using the toggle switch and adjust the %
O
2
if necessary, by turning the bottom screw “N” counterclockwise to reduce the % O
2
and clockwise to increase
the % O
2
.
Ratio (V)
Adjust at
Hi Fire
Bias (N)
Adjust at
Low Fire