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Maintenance Section
This direct-fired makeup air system is designed to require only a minimum
amount of maintenance. Some maintenance procedures outlined in this Section
require inspection only and some require action. Frequency requirements of
each maintenance procedure are listed in the Maintenance Schedule. Depending
on the environment and the number of operating hours, more frequent inspec-
tion and/or cleaning may be required to certain components.
Although maintenance requirements are minimal, the routine maintenance pro-
cedures in this Section are necessary to ensure safe, reliable, and/or efficient
operation. The paragraphs which follow discuss the components and systems
that require routine inspection/maintenance. At the beginning of each paragraph,
there is a code indicating why that maintenance procedure is necessary. The
legend for that code is shown below.
WARNING: Disconnect all power to the
system before doing any maintenance.
Failure to do so may cause electrical shock,
personal injury, or death.
Maintenance Schedule
See Chart
Lubricate bearings, Paragraph 1
Quarterly
Check the filters, Paragraph 2
Check air pressure sensing tubes,
Paragraph 4
Semi-Annually
Check blower belts, Paragraph 1
Verify gas pressures, Paragraph 3
Clean air pressure sensing tubes,
Paragraph 4
Check indicator lights, Paragraph
5
Annually
Check main burner and pilot
assembly, Paragraph 6
Figure 1 - System
Configuration
Blower
Section
Burner/Control Section
Location of Optional Filter
Cabinet (not shown)
Screened Inlet Base
Discharge Air
Optional Return Air
Outside Air
DANGER: The gas burner in this direct gas-fired system is designed and equipped to provide safe and
economically controlled complete combustion. However, if the installation does not permit the burner to
receive the proper supply of combustion air, complete combustion may not occur. The result is incomplete
combustion which produces carbon monoxide, a poisonous gas that can cause death.
Always comply with the combustion air requirements in the installation codes and operating instructions.
The amount of air over the burner must be within the specified range. The burner profile plates are set at
the factory to match CFM requirements. Do not adjust the burner profile plates without contacting the
factory. FAILURE TO PROVIDE PROPER COMBUSTION AIR CAN RESULT IN A HEALTH
HAZARD WHICH CAN CAUSE PROPERTY DAMAGE, SERIOUS INJURY, AND/OR DEATH. Direct-
fired installations should provide for air changes as required by the applicable installation codes.
Maintenance Codes
S = Safety (to avoid personal injury and/or property damage)
R = Continued Reliability
E = Efficient Operation
Reason for Maintenance