Patterson-Kelley MACH C1500, Инструкция по установке и эксплуатации

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MACH® Series Gas-Fired Boiler Maintenance
Page 33
High Water Temperature
When the boiler water has exceeded the high water
temperature limit setting, the high limit switch opens
and locks out. The control shows
E 02 on the display.
When the water temperature falls below the high-limit
temperature, the boiler will remain locked out until the
switch is manually reset and the front control panel
reset button is pressed. Once the switches are reset,
the boiler will restart provided that all other limits are
satisfied.
Low Air
When there is insufficient airflow, the air switch will
open, and the display panel will indicate
E 08 . Check
that the burner is clean ("Cleaning the Burner,"
Section 5.2) and that there are no obstructions to
airflow in the intake duct, exhaust vent, boiler air
passageways, intake flapper box and the condensate
trap. A low air indication does not necessarily mean
that the low air switch is defective. The boiler will
remain locked out until the control panel reset button
is pressed. Once the control is reset, the boiler will
restart provided that all other limits are satisfied.
Fan running and No Display
The fuse in the control may have opened and the
blower will run at high speed even though the boiler is
not firing. Shut off the power to the boiler and call a
qualified and knowledgeable service agency.
Air Switch Closed
If the display panel indicates b 61, the air pressure
switch did not open when the blower was shut off.
Check that there is no air flow through the boiler when
the fan is off. If there is no alternate source of air flow
(exhaust fan, induced draft fan, etc), replace the
switch.
Flame Failure
In the event of a flame failure during a firing period or
a trial for ignition, the main gas valves are closed and
the display will indicate
E 02. The combustion control
must be manually reset and the boiler will restart
provided that all other limits are satisfied.
Insufficient water flow
In the event of insufficient water flow, the outlet
temperature will rise rapidly and the control may
display one of the following errors: E 18, E 25, b 18, b
25, b 30. Check the water pumps, associated piping,
and any strainers, valves, etc. to ensure proper flow is
present. Once the flow has been re-established, any
manual lockout must be reset and the boiler will restart
provided that all other limits are satisfied.