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Quest Oil Fired CHH-980 Installation, Operation and Maintenance Instructions
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-A few seconds later, the stat light will come on and the burner fan will purge the combustion
chamber for a few seconds.
-The burner should light following the pre-purge. If air is still present in the fuel lines or filter, the
burner may not light and lock out. It might be necessary to reset the burner module 2 or 3 times
until fuel reaches the burner head and ignition takes place.
• Make sure the operator (Fig. 13) is set at the desired temperature. DO NOT Operate at temperatures
above 200ºF, or damage to inline controls and certain accessory components can result. To adjust
setpoint on this control just use the up and down key. There is no need to go into the menu of the
control to perform this function. The control simultaneously displays setpoint temperature and actual
supply fluid temperature.
• Once the setpoint temperature has been reached, the burner will cycle off and on as needed.
• At this time you can initiate the “2-pump operating mode” if the system is supporting a load of more
than half its capacity. See article 4.5 above for correct HTF valve positions. OPEN valve “A” for the
secondary pump and turn ON the secondary pump switch. Remember that valves “A” or “B” must be
open only when the corresponding pump is running.
5.2 Shutdown
• Turn OFF the burner switch (Fig. 16). The burner will shut down but the circulation pump will continue
to run.
• It is recommended that the fluid be allowed to continue circulating until it has cooled down to 100ºF or
lower.
• Turn OFF both pump switches (Fig. 15). If any fancoils and hoses have been placed at a higher elevation
than the CHH-980, the primary hoses should be immediately disconnected from the CHH-980 (Fig. 31).
This will prevent fluid from draining back and overflowing at the HTF reservoir vent (Fig. 36).
• Turn OFF the main power switch (Fig. 14).
• Turn OFF manual fuel supply valves.
• If the system is to be de-commissioned, it is now safe to disconnect the power supply and all HTF
circulation hoses, manifolds and accessories.
6. Maintenance
6.1 Service Instructions and Checks
“CAUTION: Label all wires prior to disconnection when servicing controls. Wiring Errors
can cause Improper and Dangerous Operation. Verify proper operation after servicing
A. To achieve and ensure clean combustion from the burner, a “flue-gas analyzer” and “smoke spot
tester” must be used to verify clean combustion. Perform the following checks while the burner is firing.
Must be performed by a trained service technician ONLY. Refer to the Wayne model FH manual for burner
adjustment instructions. These checks should be performed, every time, when putting the system into
operation on a new project and a minimum of once yearly.
a. Before starting the burner, determine that the correct nozzles are in place (Delavan 2.75-60ºB). 2
nozzles are required.