Man Hours .25
Special Instructions:
1. Read and understand manufacturer's instructions before making adjustments or
calibration.
2. Obtain control system diagrams.
3. Before calibrating or adjusting pneumatic controls, adjust the pressure of
the main control air supplying pneumatic sensors, thermostats, and
controllers to manufacturer's specifications.
4. Servicing of pneumatic air compressors and control air reducing stations
shall be performed at the same time to prevent duplication of some service
check points.
Items to Check & Initial Completion:
1. ___ Check set point of controls (temperature, humidity, or pressure).
2. ___ Compare control point with an external measuring device, note deviations,
and adjust.
3. ___ Check the unit over its range of control. If possible, impose simulated
conditions to activate controls and check operation.
4. ___ Check for control point cycling.
5. ___ Check for correct pressure differential on all two position controllers
(on-off-open-closed).
6. ___ Check condition and action of primary elements in the controllers
(bi-metallic strips, and or sealed bellows with capillary tubing for
remote sensing.
7. ___ Note the action of the controlling device (thermostats, humidistats, and
pressurestats) which changes the action of the controlled device (motors,
valves, dampers, etc.)
8. ___ On electronic controls check the source of the signal and its
amplification.
9. ___ Check air systems for leaks, check for correct main control air pressure
to control devices. Check units for proper closing and loose connections.
10.___ Check the condition and the ability of humidity sensing
control elements (hair, wood, leather, or similar substances) to read the
moisture changes and their action on the control mechanism.
11.___ Check resulting action of the pressure sensing primary
control elements such as diaphragms, bellows, inverted bells, and similar
devices when activated by air, water, or similar pressure. Check
operation of all relays, pilot valves, and pressure regulators.
12.___ Replace air filters in sensors, controllers, and thermostats as required.
13.___ Use test kits and manufacturer's instructions whenever
possible. Replace rather than rebuild a control installed in the system.
Take control to shop for repair.
Tools & Materials:
1. Standard Tool Kit
Plus Insulated pliers and screwdrivers
Wire strippers
Wire crimpers
Voltmeter - Ohmmeter - Milliammeter
Clamp on meter(volt - ohm - amp meter)
Soldering kit
1/8" 25' fish tape
Burnishing tool
2. Pressure gauge, psychrometer
3. Volt Ohm Meter
4. Air filter replacements
5. Control spares as needed
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