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Quest Gas Fired CHH-300 Installation, Operation and Maintenance Instructions
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-The burner should light following the pre-purge. If air is still present in the gas lines, the burner
may not light and will lock out. It might be necessary to push the red reset button on the burner
module 2 or 3 times until gas reaches the burner head and ignition takes place.
• Make sure the stat (Fig. 8) 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.
5.2 Shutdown
• Turn OFF the burner switch (Fig. 11). The burner will no longer recycle 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 the pump switch (Fig. 10). If any fancoils and hoses have been placed at a higher elevation
than the CHH-300, the primary hoses should be immediately disconnected from the CHH-300 (Fig. 26).
This will prevent fluid from draining back and overflowing at the HTF reservoir vent (Fig. 30).
• Turn OFF the main power switch (Fig. 9).
• Turn OFF manual gas supply valves.
• If the system is to be de-commissioned, it is now safe to disconnect the power supply, the natural gas or
propane supply (if applicable) 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” 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 Riello burner Manual for burner adjustment instructions. This check
should be performed, every time, when putting the system into operation on a new project and a minimum
of once yearly.
a. Ensure that the gas manifold pressure is at 3.5”WC for propane fired units or 3.8”WC for natural gas
fired units. Adjust if necessary.
b. Regulation of combustion air flow is made by adjustment of the manual air adjustment plate. Initial
suggested setting is (3.5) for natural gas and (3.0) for propane gas.
c. Final position of the air adjustment plate must be set based on instrument readings of not greater
than 12.0% CO2 for propane-fired systems and 10% CO2 for natural gas systems. Final readings must
be taken with all service-access doors closed.
