Armstrong EHU-700 Series Guía para resolver problemas descargar pdf (Pagina 11)

Troubleshooting Guide

I. HumidiPack/HumidiPackPlus will not discharge steam.

A. Control System Fault

1. Control valve operator-does the valve open and close as the control signal varies

between 0% to 100%?

B. Steam System Malfunction

1. Strainer screen before control valve is plugged.

2. Pressure reducing valve malfunction.

II. HumidiPack/HumidiPackPlus discharges continuously even though

humidity has exceeded desired level.

A. Humidity controller or pneumatic operator out of calibration.

B. Control valve malfunction.

1. Valve stem on control valve "frozen" to stem seal due to unusual chemical or

corrosive conditions in steam system.

2. Operator spring on pneumatic control valve broken.

3. Dirt or scale between valve and seat in control valve - blow down and clean strainer.

III. Low Steam Output

A. Control system

1. Humidity controller or pneumatic operator not calibrated

or malfunctioning.

2. Control valve faulty.

B. Steam system

1. Piping not sized correctly.

IV. HumidiPack/HumidiPackPlus "Spitting"

A. Lift or back pressure after float & thermostatic steam trap(s) is too great for steam

supply pressure resulting in flooded HumidiPack panel.

B. Supply steam not properly dripped.

C. HumidiPackPlus ONLY: Jacketing supply steam to the active tubes may be isolated

or off.

D. The steam trap draining HumidiPack/HumidiPackPlus header has failed closed.

E. HumidiPackPlus ONLY: The steam trap draining the active tube jackets has failed

closed.

F. Tubes on the panel are sloped away from instead of towards the header.

G. Not enough "head" distance in between the bottom of the HumidiPack/HumidiPackPlus

header and top of F&T drip traps.

H. Steam trap draining HumidiPack/HumidiPackPlus header is not isolated from a common

return line (check valves not installed after trap.)

I. Verify sufficient jacketing pressure is available for HumidiPackPlus units.

Contact factory for acceptable guidelines.

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Armstrong EHU-700 Series Guía para resolver problemas Pagina 11