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Facility Operations Bulletins Facility Operations Bulletins
Support for Principals and Engineers
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A Good Environment Does Make a Difference














Pneumatic Temperature Control Systems:

Pneumatic temperature control systems are used in approximately 80% of the schools
throughout the system. Air systems provide long lasting, reliable, temperature control with
minimal maintenance. However, it is extremely important that the maintenance be done as
scheduled.

Almost all of the maintenance centers on the air compressor and receiving tank, the air dryer,
filters, and pressure controller. If all the items mentioned are properly maintained and the air
leaving the pressure reducing station is clean and dry, the rest of the system will operate with
little or no maintenance, aside from minor calibrations and adjustments.

The following components require periodic maintenance:
Air Compressor
§
Air intake filters; requires cleaning or replacement as per the instruction manual.
§
Compressor crankcase oil; should be changed twice per year, check oil requirements.
§
Belts; adjust tension, maintain a replacement.
§
Motor lubrication as per instruction manual.

Receiving Tank
§
Check pressure relief valve for leaks
§
Manually open the tank drain weekly
§
Check operation of auto-drain if unit is so equipped

Dryer
§
Change filters
§
Drain the separator
§
Clean the condensing coil

Pressure Reducing Station
§
Check operation and adjust pressure to proper level, replace if the unit will not
maintain a constant pressure.

The temperature selector control in the primary control cabinet is the only adjustment that
should be used unless the engineer has the instruments and advanced knowledge required to
analyze problems with the primary control systems. Arrange for contractors with specialized
skills and technical knowledge to work on your schools particular system, if problems arise.

A properly operating temperature control system will maintain the classrooms and offices
throughout the building at a relatively constant temperature regardless of the outside
conditions (sun on one side of the building, high wind, or very low temperatures, etc.). It is
essential for a comfortable building, that this system be closely monitored and maintained.