Adjustment Of Temperature
Rise
About this task:
The temperature rise (the difference of temperature
between the return air and the heated air from the
furnace) must lie within the range shown on the unit
rating plate and the data in "Physical Data".
After the temperature rise has been determined, the
CFM can be calculated as follows:
After about 20 minutes of operation, determine
the furnace temperature rise. Take readings of
both the return air and the heated air in the ducts
(about 6 feet from the furnace) where they will not
be affected by radiant heat. Increase the blower
CFM to decrease the temperature rise; decrease
the blower CFM to increase the rise (see "Supply Air
Drive Adjustment").
Note:
Each gas heat exchanger size has a
minimum allowable CFM. Below this CFM, the
limit will open.
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.
Note:
Reverse the above procedure to
replace the assemblies.
Make sure that burners are level and seat
at the rear of the gas orifice.
Figure 31: Typical Flame
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.
INSTALLATION MANUAL ZX SERIES 6 - 12.5 Ton 60 Hertz R-410A
93
Johnson Controls Ducted Systems
Содержание ZX Series
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