General Information; Functional Description - omi ESD Series Instruction And Maintenance Manual

1. GENERAL INFORMATION

1.1 Functional description

OMI refrigerated air dryers remove moisture from compressed air. Moisture is detrimental to pneumatically operated appliances,
controls, instruments, machinery and tools.
Compressed air enters the patented aluminum heat exchanger where it is cooled down to the dew point temperature in two different
stages: In the first air/air sector compressed inlet air is cooled thanks to the colder compressed air coming out counterflow from the
condensate separator. In the second refrigerant / air sector, compressed air temperature is further lowered to the dew point
temperature. During this two stages almost all the oil and water vapours contained in compressed air are condensed to liquid and
successively be separated from the compressed air in the condensate separator and drained out by the automatic drain. At this point
the obtained cold air re-enters counterflow the initial air / air exchanger and it is reheated by the inlet hot air with the consequence of
energy recovering and also reduction of the relative humidity contained in the outflowing air.
A glycol circuit
allows the dryer to exploit the full power of the refrigerant system, maximizing in this way the efficiency; the energy
surplus is stored by the glycol, so at partial load the microprocessor can swich off the refrigerant system for significant periods of time,
while the glycol circulation system (always running) ensures a constant dew point. Under standard load condition the refrigerant circuit
is turned on 100% of the time, while if there is no load is about 5% only.
This dryer can be easily installed into various pneumatic systems in which dry air is required or desired. Please refer to Principles of
Operation for complete operating details.
The dryer comes provided with all the control, safety and adjustment devices, therefore no auxiliary devices are needed.
A system overload not exceeding the maximum operative limits can worsen the operational performance of the dryer (high
dew point), but it will not affect its safety.
The electric diagram (attachment B) shows the minimum protection degree IP 42.
Improper grounding can result in electrical shock and can cause severe injury or death.
This product must be connected to a grounded, metallic, permanent wiring system or an equipment-grounding terminal or
lead on the product.
All grounding must be performed by a qualified electrician and comply with national and local electrical codes.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
Ground must be established with a bare grounding wire sized according to the voltage and minimum branch circuit
requirements.
Ensure good bare metal contact at all grounding connection points, and ensure all connections are clean and tight.
Check grounding connections after initial installation and periodically thereafter to ensure good contact and continuity has
been maintained.
Check with a qualified electrician or service technician if the grounding instructions are not completely understood, or if in
doubt as to whether the product is properly grounded.
1.2 Use of the machine in safe conditions
This system has been designed and manufactured in compliance with the European safety directive in force and UL/ULC, therefore
any installation, use and maintenance operations must be performed respecting the instructions contained in this manual.
Because an air dryer is pressurized and contains rotating parts, the same precautions should be observed as with any piece of
machinery of this type where carelessness in operation or maintenance could be hazardous to personnel. In addition to obvious safety
rules that should be followed with this type of machinery, safety precautions as listed below must be observed.
1. Only qualified personnel shall be permitted to adjust, perform maintenance or repair this air dryer.
2. Read all instructions completely before operating unit.
3. Pull main electrical disconnect switch and disconnect any separate control lines, if used, before attempting to work
or perform maintenance on the unit.
4. Do not attempt to service any part while machine is in an operational mode.
5. Do not attempt to remove any parts without first relieving the entire air system of pressure.
6. Do not attempt to remove any part of the refrigeration system without removing and containing refrigerant in
accordance with the EPA and local regulations.
7. Do not operate the dryer at pressures in excess of its rating.
8. Do not operate the dryer without guards, shields and screen in place.
9. Inspect unit daily to observe and correct any unsafe operating conditions.
Cod. 710.0159.01.00 Rev0A – 10.2011
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