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The Dry Air Pac from General Air Products is an FM Approved air compressor, desiccant dryer package designed to eliminate ice plugs in freezer room fire protection sprinkler systems. The Dry Air Pac can also be used to slow the effects of corrosion in dry pipe sprinkler systems and is used frequently in critical applications where a moisture free environment is a must.
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The Leading Manufacturer of Air Compressors The Leading Manufacturer of Air Compressors Designed for All Types of Dry Pipe Sprinkler SystemsDesigned for All Types of Dry Pipe Sprinkler Systems
Quality& ServiceSince 1936
The Leading Manufacturer of Air Compressors The Leading Manufacturer of Air Compressors Designed for All Types of Dry Pipe Sprinkler SystemsDesigned for All Types of Dry Pipe Sprinkler Systems
Proud Member of
Dry Air Pac For Critical Applications
•Basics of Compressed Air
•Ice Plugs
•Primary Components
•A Closer Look At The Integrated Control Panel
•Inside the Control Panel
•Troubleshooting
Dry Air Pac For Critical Applications
Basics of Compressed Air
Basics of Compressed Air
Air Compressors
Compressed Air: Atmospheric air compressed by a mechanical device to increase its pressure.
• Compressed air is an energy source – often considered the 4th utility.
Moisture
Dewpoint: Temperature at which moisture will occur.
• Example: 75ºF, 75 RH, 25 CFM = 4.5 gallons of water per day
Air Dryers
• Refrigerated, 30ºF – 39ºF dewpoint
• Chemical, down to -100ºF dewpoint
Basics of Compressed Air
Compression Ratio
It takes 7.8 Ft3 of atmospheric air (14.69 PSIA) to make one actual cubic foot of air at 100 psig. (psia / atmosphere)
Basics of Compressed Air
Compression Ratio
Dry Air Pac For Critical Applications
Ice Plugs
The Problem - Ice Plugs
• Ice Plug formation causes partial and eventually complete blockage of the dry-pipe system.
•Factory Mutual, after several years of study, found that 50% to 70% of the dry pipe systems inspected were plagued with Ice Plug problems.
The Cause - Ice Plugs
• Evaporating Priming Water
• Water left in the lines after annual trip test.
• The Major Culprit, moisture laden compressed air meeting freezing temperatures in the Dry Pipe System.
(Contrary to popular belief, using air from the freezer room for the dry pipe systemWill not solve the ice plug problem)
Dry Air Pac For Critical Applications
The Solution …
• Freezer Rooms
• Cold Storage
• Parking Garages
• Potential MIC Effected Areas
• Anywhere Dry Air is Essential
Dry Air Pac For Critical Applications
Primary Components
FM Approval eliminates requirement to connect air intake to freezer room.
Industrial Duty Compressor Pump
Removable Intake Filter with Weatherhood
Compact Air Cooled Aftercooler
Pressure Switch
Check Valve
ASME / NB Tank (30 Gallons)
Integrated Electronic Drain
Vibration Isolation Pads
Prefilter with Differential Pressure Gauge
SAEJ10 Towers
Purge Pressure Gauge
Oversized Mufflers for quiet discharges and low backpressure
UL Listed / FM Approved Air Maintenance Device
Combination Afterfilter & Regulator
Dry Air Outlet
Dewpoint Test Port
Dry Air Pac Test Kit
gives visual indication if moisture is present (Available as option).
Fully Integrated Control Panel ensures package performs to specification.
A Closer Look at the Fully Integrated Control
Panel
Fully Integrated Control Panel – Performance Lights
Fully Integrated Control Panel –
•Reset Button
•Control Panel Power
•Incorporated Automatic Drain Controls
Fully Integrated Control Panel – Hour Meter
Fully Integrated Control Panel – Receiver Pressure Gauge
Fully Integrated Control Panel – Left Tower Pressure Gauge
Fully Integrated Control Panel – Right Tower Pressure Gauge
Fully Integrated Control Panel – Outlet Pressure Gauge
Inside the Control Panel
Inside the Control Panel – Magnetic Line Starter (NEMA Rated)
Inside the Control Panel – Control Circuit Transformer (with primary and secondary fusing)
Inside the Control Panel – Cam Timer
Inside the Control Panel – Solenoid Valves
Dry Air Pac For Critical Applications
Troubleshooting
Troubleshooting the Dry Air Pac
Problem
Poor Dewpoint Performance
Probable Cause
Low pressure on desiccant dryer
Excessive water or oil in dryer
Low purge flow
Desiccant contamination
High inlet temp. to dryer
Solution
Reset Pressure Switch .
Check coalescing filter & automatic drain operation
Check purge pressure setting
Check the date of the last desiccant change. Recommended change every 1 to 2 years
Clean aftercooler
Troubleshooting the Dry Air Pac
Problem
Excessive Pressure Drop
Probable Cause
Switching valve failure . .
Desiccant breakdown
Clogged filters
Solution
Check tower-operating sequence to verify and identify which valves are operating.
Change desiccant
Change filter elements
Troubleshooting the Dry Air Pac
Problem
Switchover Failure
Probable Cause
Electric power loss . .
Solenoid valve failure
Solution
Turn dryer off; check connections to cam timer and inlet to unit.
Check valve operative sequence. Replace valve.
Troubleshooting the Dry Air Pac
Problem
Repressurization Failure or Purge Failure
Probable Cause
Purge flow control valve orifice clogged.
Failed check valve.
Purge exhaust solenoid valve failure.
Purge exhaust muffler clogged.
Solution
Clean or replace. .
Replace.
Turn dryer off, check connections to cam timer, inspect valve and solenoid, replace if necessary. .
Clean or replace.
The Leading Manufacturer of Air Compressors The Leading Manufacturer of Air Compressors Designed for All Types of Dry Pipe Sprinkler SystemsDesigned for All Types of Dry Pipe Sprinkler Systems
Call Toll Free
1-800-345-8207Or visit our web site
www.GeneralAirProducts.com