17.2.8 Inspect smoke detection/fire suppression system.
17.3 Periodic maintenance consists of the following:
17.3.1 Replace filters when reverse jet pulse cleaning is no longer effective in reducing differential pressure to the normal operating range. (See cartridge filter replacement on page 14)
17.3.2 Clean the internal parts of the reverse jet pulse control with a quality electrical cleaning chemical.
17.3.3 Clean the internal components of the fan control.
17.3.4 Remove any accumulated dust from the pressure port that is connected to the Magnehelic Gage or Reverse Jet Pulse Control or both. This is located inside the dust collector on the dirty air side. NOTE: The diaphragms which enable the measurement of differential pressure on the “Magnehelic Gage” OR “Pulse Control” are EXTREMELY fragile, and the use of compressed air will damage these units.
17.3.5 Replace the cartridge filter caps after every 4th filter change or before if failure of gasket seal occurs.
NOTE: BE CERTAIN THAT THE FLOW OF COMPRESSED AIR IS TURNED OFF AND THE RESIDUAL PRESSURE RELIEVED BEFORE SERVICING ANY COMPONENTS THAT CONTAIN COMPRESSED AIR.
17.3.6 Follow the manufacturer’s maintenance schedule for the compressed air filters
17.3.7 Tighten the couplings of the valves for the reverse jet pulse cleaning.
17.3.8 Remove any moisture that has accumulated in the compressed air manifold and accumulator.
17.3.9 Inspect and clean diaphragm valves. A thorough cleaning normally rectifies operational problems with valves; however, any worn or damaged parts are to be replaced. Use the following procedure to inspect and repair valves:
17.3.9.1 Main Diaphragm
a. Switch off air supply and drain the system. b. Unscrew the main diaphragm cover bolts and remove the valve cover. c. Inspect the spring and diaphragm for dust and damage. Remove dust with water and
replace damaged parts with diaphragm repair kits for 1” or 1.5” valves. d. Replace valve cover and valve cover bolts.
17.3.9.2 Solenoid Diaphragm
a. Switch off air supply and drain the system. b. Unscrew the bonnet bolts and remove the bonnet. c. Inspect the diaphragm for dust and damage. Remove dust with water and replace
damaged parts with diaphragm repair kit for 1” or 1.5” valves. d. Replace the valve bonnet and valve bonnet bolts.
17.3.9.3 Solenoid Coil
a. Switch off air supply and drain system. b. Apply proper voltage to the coil and listen for a pronounced “Click” as the pole
moves.
c. If a pronounced “Click” occurs and the valve does not function follow instructions for
replacing the main diaphragm and solenoid diaphragm.
Page 14
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