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Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
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b. Fire the burner and ensure that the oil pressure is at 162 PSI. Adjust if necessary.
c. Regulation of combustion air flow is made by adjustment of the manual AIR ADJUSTMENT dial.
Initial suggested setting is (6.0).
d. Final position of the air adjustment plate must be set based on instrument readings of not greater
than 13.0% CO2 and a smoke spot reading of zero. Final readings must be taken with all service-access
doors closed.
B. After placing this unit in operation, the ignition system safety shutoff device must be tested. Must be
performed by a trained service technician ONLY. This check should be performed, every time, when putting
the system into operation on a new project or a minimum of once yearly.
a. Shut OFF the “burner circuit” power switch.
b. Remove the primary control box from the burner and place a small piece of dark tape over the
light-sensing, cad-cell eye that senses the presence of flame in the combustion chamber. Put the primary
control back in place.
c. Turn the power switch back ON and initiate burner lighting procedure. After the short pre-purge
cycle, the burner should light but go out in 5 seconds and lock out. If the burner does not lock out with
the cad-cell eye covered, the primary control should be replaced.
d. To put the unit back in standard operating mode, turn OFF the burner circuit power switch, remove
the tape-cover from the burner’s primary control box, re-insert the control and turn ON the “burner
circuit” power switch.
C. Examine the flue gas exhaust pipe and rain cap to be sure they are solidly attached and free from any
type of obstruction. Clean if necessary.
a. This check should be performed, every time, when putting the system into operation on a new
project or a minimum of once yearly.
D. After placing this unit in operation, the low water safety shutoff device must be tested. Must be
performed by a trained service technician ONLY. The low water cutoff switch is located in plain view at the
same end of the CHH-980 as the circulating pumps and is identified with a label.
a. Push the test switch on the outside of the control. This will simulate a “Low Water” condition and
open the burner circuit to prevent burner initiation.
b. By pushing the reset button, the control will restore function to the burner circuit as long as there is
fluid touching the probe. The electronic probe is a “self cleaning” type and should not require service.
c. This control should be tested every time, when putting the system into operation on a new project or
a minimum of once yearly.
E. After placing this unit in operation, the high temperature limit safety shutoff device must be tested. Must
be performed by a trained service technician ONLY. Two high temperature limit switches are located in plain
view at the same end of the CHH-980 as the circulating pumps and are identified with labels. One of these
switches re-sets itself automatically and is set at a slightly lower temperature (about 5ºF) than the other which
must be manually re-set after its set point has been reached.
a. With the burner firing, set the main digital operating stat to a temperature value that is at least 5ºF
higher than the set point of the manual re-set high temperature limit switch.
b. When the fluid temperature reaches the set point of the automatic re-set limit switch, it should shut
down the burner. As the fluid cools down 2 or 3 degrees, the burner should re-fire. This automatic re-set
limit switch should function like a second thermostat and will take over as operator of the burner.
