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Quest Gas Fired CHH-300 Installation, Operation and Maintenance Instructions
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e. These controls should be tested every time, when putting the system into operation on a new project
or a minimum of once yearly.
F. After placing this unit in operation, the high pressure safety shutoff (blocked-flue) device must be tested.
Must be performed by a trained service technician ONLY. The high pressure cutoff switch is located just
below and to the left of the burner and is identified with a label.
a. Remove the chimney rain cap.
b. With the burner firing, cover the chimney flue pipe so it is blocked off completely. This should cause
the pressure switch contacts to open and shut down the burner.
c. Remove the cover from the pipe and replace the rain cap. The burner should not try to re-light since
the switch must be manually re-set.
d. By pushing the reset button (located under the electrical box cover of the pressure switch), the
control will reset and the burner should light again.
e. This control should be tested every time, when putting the system into operation on a new project or
a minimum of once yearly.
G. Procedure for cleaning flue gas passageways. This procedure should be performed in the event of
blockage in the flue gas passage due to soot or any other obstruction that may occur. Improper burner
settings or maintenance could cause soot accumulation in the combustion chamber. The following steps
should be taken to clean out the chamber flue gas passageway. Must be performed by a trained service
technician ONLY.
a. Shut off and disconnect external gas supply and electrical power supply.
b. Drain the heat transfer fluid from the system.
c. Exterior cabinet side panels and the cabinet door & framing members, at the burner end of the
cabinet, should be removed, to facilitate access to the combustion chamber. The control panel should
be loosened from its mounting frame. These are all bolt-on components.
d. Once access to the chamber has been gained, disconnect the burner electrical supply line and
gas supply line and remove the burner. Two bolts will need to be removed that hold the burner to its
mounting flange.
e. Disconnect the flue gas vent pipe by removing screws and clamping bands. Remove the pipe and
rain cap assembly and clean its interior thoroughly.
f. Two hoses are connected to 1” fittings that protrude through the front flange plate disk of the
combustion chamber. These hoses will need to be disconnected by loosening the hose clamps and
pulling the hose off the insert barbs.
g. Remove 8 bolts that hold the chamber flange plate disk to the main chamber body.
h. The inner section of the combustion chamber can now be pulled straight out of the main chamber
body. All flue gas contact surfaces are now exposed and can be easily cleaned with vacuum cleaner,
brushes or other cleaning utensils.
i. To re-assemble the unit, replace components in reverse order to which they were removed.
j. Reconnect gas and power supply to the unit and when re-starting the system perform all safety and
service checks as outlined above.
