Quest Engineering PowerHeat 980 Pro CHH-980 Installation, Operation And Maintenance Instructions - Quest
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Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
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c. If you now adjust the set point of the automatic re-set limit switch to a level a few degrees higher
than the set point of the manual re-set limit switch, the burner should continue to fire until the set point
of the manual re-set high limit is reached. At this point the burner should be shut down and this time
should not come back on as the fluid cools back down.
d. The manual re-set high limit will need to be manually re-set, by pushing the red re-set button. Adjust
the operator back down to a normal operating lower setting and re-adjust the automatic high limit back
down to its regular set point at about 5ºF lower than the manual re-set limit.
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 on 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 fuel 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 fuel supply and electrical power supply.
b. Drain the heat transfer fluid from the system.
c. The control panel should be loosened from its mounting frame.
d. Once access to the chamber has been gained, disconnect the burner electrical supply line and
fuel supply lines and remove the burner. 4 bolts will need to be removed that hold the burner to its
mounting flange.
e. Disconnect the flue exhaust vent pipe by removing screws. Remove the pipe and rain cap assembly
and clean its interior thoroughly.
f. Hoses will need to be disconnected by loosening the hose clamps and pulling the hose off the insert
barbs.
g. Remove all 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. A fork lift or other machinery may be required for this procedure since the chamber is very heavy.
i. All flue exhaust gas contact surfaces are now exposed and can be easily cleaned with vacuum
cleaner, brushes or other cleaning utensils.