Burners/Orifices Inspection/Servicing - York International ZQ Series Installation Manual

Burners/Orifices Inspection/
Servicing
About this task:
Before checking or changing burners or orifices,
CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT
OFF ALL POWER TO THE UNIT.
1. Open the union fitting just upstream of the
unit gas valve and downstream from the main
manual shut-off valve in the gas supply line.
2. Remove the screws holding each end of the
manifold to the manifold supports.
3. Disconnect wiring to the gas valve. Remove
the manifold & gas valve assembly. Orifices
can now be inspected and/or replaced.
To service burners, complete step 4.
4. Remove the heat shield on top of the manifold
supports. Burners are now accessible for
inspection and/or replacement.
Figure 30: 3 Thru 5 Ton, 1/2" Single Stage Gas Valve
Make sure that burners are level and seat at the
rear of the gas orifice.
Figure 29: Typical Flame
INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A
Johnson Controls Ducted Systems
Note: Reverse the above procedure to
replace the assemblies.
Note: installation of this furnace at
altitudes above 2000 ft (610 m) shall be
in accordance with local codes, or in
the absence of local codes, the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 or
National Standard of Canada, Natural Gas
and Propane Installation Code, CSA B149.1.
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