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 ft
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
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 and 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 71: Typical Flame
Item
Description
A
Roll-out switch
B
Heat exchanger tube
C
Burner flame (blue only)
D
Ignitor
E
Burner bracket
F
Burner
G
Orifice
H
Manifold
Installation Manual: YORK
®
Sun™ Select YV28 to YV50
92
Johnson Controls Ducted Systems
Содержание Sun Select YV28
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