Arrow Pneumatics RH105 User manual

OWNERS MANUAL
Form: F- 0071
MINI-REGENERATIVE AIR DRYER
power
MODELS RH105 THROUGH RH125
Mini-Regenerative
Mini-Regenerative Air Dryer
Air Dryer
ARROW PNEUMATICS

DIMENSIONS
Specifications
MODEL DRYING CAPACITY PURGE IN/OUT CONN.
SCFM SCFM
RH105 5 .71 1/2” NPT
RH110 10 1.41 1/2” NPT
RH115 15 2.12 1/2” NPT
RH120 20 2.82 1/2” NPT
RH125 25 3.53 1/2” NPT
• CAPACITIES ARE BASED ON 100ºF INLET TEMPERATURES, 100ºF AMBIENT TEMPERATURES
AND 100 PSIG INLET PRESSURE.
• MAXIMUM WORKING PRESSURE: 150 PSIG
• MINIMUM WORKING PRESSURE: 75 PSIG
• MAXIMUM INLET TEMPERATURE: 120ºF
• MINIMUM INLET TEMPERATURE: 32ºF
• STANDARD -40ºF PRESSURE DEW POINT
• OPTIONAL -100º PRESSURE DEW POINT
• STANDARD CYCLE TIME: 5 MINUTES
• OPTIONAL CYCLE TIME: 2 MINUTES WITH -100ºF PRESSURE DEW POINT
• ENCLOSURE: NEMA 1
• STANDARD VOLTAGE: 120V, 1 PHASE, 60 HZ
• OPTIONAL VOLTAGE: 220V, 1 PHASE, 60HZ
• AMPS: 1.0
• STANDARD POWER PLUG: 6 FT. HEAVY-DUTY 3 PRONG GROUNDED
SPECIFICATIONS
RH 115-125
RH 105-110
2
MODEL HEIGHT WIDTH DEPTH WEIGHT
RH105 22” 10” 5” 50 LBS
RH110 22” 10” 5” 60 LBS
RH115 30” 12” 8” 70 LBS
RH120 30” 12” 8” 90 LBS
RH125 30” 12” 8” 90 LBS

Unpacking/Application/Analysis
3
UNPACKING
ARROW REGENERATIVE AIR DRYERS ARE SHIPPED AS COMPLETELY ASSEMBLED PACK-
AGES FILLED WITH DESICCANT READY TO INSTALL.
VISUALLY CHECK THE DRYER FOR DAMAGE THAT MAY HAVE OCCURRED IN TRANSIT. IF
THERE IS EVIDENCE OF DAMAGE, IMMEDIATELY ENTER A CLAIM WITH THE CARRIER,
AND NOTIFY YOUR ARROW REPRESENTATIVE.
Operating pressure of your Arrow Dryer can range from 75 minimum to 150 maximum PSIG.
Check dryer label to verify maximum service pressure. Air available for your air usage will
vary with operating pressure.
The dryer should not be installed where compressed air and/or ambient temperature exceeds
120°F or drops below +32°F. Locate dryer to avoid extremes of heat and cold from other
conditions. Best results occur when dryer is located as close to point of use as practical.
Avoid locating dryer outside or where it is exposed to the elements.
Dryers are sized according to airflow not pipe size. Dryer requires 10% to 15% of inlet air-
flow (SCFM) for regeneration. The difference between the inlet and outlet flow is the amount
of purge air required. This air is purged to atmosphere and is not available for use down-
stream. Make certain air supply to dryer meets your air demand plus purge air requirements.
APPLICATION CHECK AND ANALYSIS
1
2
3
READ CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR MAINTAIN YOUR
DRYER. PROTECT YOURSELF AND OTHERS BY OBSERVING ALL SAFETY
INFORMATION. FAILURE TO DO SO COULD RESULT IN PERSONAL INJURY AND/OR
PROPERTY DAMAGE. KEEP OWNER’S MANUAL FOR FUTURE REFERENCE.
TO ACHIEVE THE BEST DRYER PERFORMANCE, YOU SHOULD CAREFULLY CHECK THAT
THE DESIGN AND INSTALLATION REQUIREMENTS OUTLINED BELOW ARE SATISFIED.

Remove all pipe plugs from the dryer. Take care to insure that pipe dope, pipe tape,
scale or metal chips are not trapped before the inlet port.
Note: Pre & After Filters Must Be Used On All Units
Install Pre-Filters to “Inlet Air” connection on side of cabinet.
• Wet air inlet should be connected to pre-filter connection on the side of
cabinet.
• In situations where air supply is required 24 hours a day (it is undesirable to
interrupt the airflow), a three valve bypass system is recommended to
bypass the dryer and filters. Use the fewest elbows and taper connections
necessary to keep pressure drop at a minimum.
• Compressed air entering the dryer must be cooled to at least 120ºF.
• Pre-filters, located before the dryer, protect desiccant beds from contamination by oil, entrained water,
pipe scale, etc., thereby extending dryer desiccant life. Locate pre-filters as close to the dryer as possible.
• It is recommended that a mechanical separator be installed immediately preceding the pre-filter to
remove the bulk liquid oil and entrained water.
Install After Filter to “Outlet Air” connection on side of cabinet.
• Dry air outlet should be connected to after-filter connection on the side of cabinet.
• After filters, located after the dryer, help eliminate the possibility of desiccant dusting and carry over
into the air system.
Install Purge Muffler (shipped separately inside of cabinet) to the connection marked “Purge Air” on the side of
the cabinet.
• If Purge Muffler is piped away from dryer - The exhaust muffler must be periodically
checked for any restrictive debris. At high pressure, a clogged muffler could result in high
back pressure and could result in increased dew point, mechanical failure or personal injury.
Installation
Generally, locate your dryer downstream from the air receiver. The only exception would be
on applications with a fluctuating demand. Then the dryer should be located upstream of the
receiver to avoid air surges through the dryer’s desiccant beds.
Provide adequate space around the dryer for servicing.
Four mounting holes are provided in the rear of the cabinet, use the provided bolt hole tem-
plate to secure dryer to the wall. Arrow recommends using (4) #14 round head wood screws,
#14 round of pan head machine screws, #14 pan head self tapping or sheet metal screws or
1/4” round or pan head machine screws for mounting. Mount dryer vertically in an upright
position at desired location.
MOUNTING SPECIFICATIONS AND DRYER LOCATION
PIPING ARRANGEMENT & FILTER INSTALLATION
Inlet
Outlet
1
2
3
4
RH 105- 110 RH 115- 125
4

Installation/Start-up
5
ELECTRICAL CONNECTION
Check to see that the power supply to the dryer is the same as the power requirements
indicated on the identification label.
Confirm that the lighted ON/Off switch is in the OFF position.
Install the power cord plug into receptacle.
WIRING DIAGRAM
START-UP OPERATIONS
SLOWLY PRESSURIZE THE DRYER!
When the dryer reaches full operating pressure, check the system for air leaks. Soap test
all joints and fittings. To maintain desired dew point, any leaks detected must be fixed,
especially those on the outlet side of the dryer.
Energize electrical circuit by simply pressing the on/off switch to the “ON” position.
The switch indicator light will be illuminated when the dryer is in operation.
When the electrical circuit has been energized, the control circuit board will start to operate
and automatically initiate dryer operation. The timer is factory set, so that no field
adjustment is necessary.
OPERATION OF THE DRYER SHOULD ONLY TAKE PLACE WHEN USING COMPRESSED
AIR. WHEN THE COMPRESSOR IS SHUT DOWN, THE DRYER SHOULD ALSO BE
SHUT OFF. FAILURE TO DO SO COULD LEAD TO PREMATURE FAILURE.
AFTER ALL PIPING AND ELECTRICAL CONNECTIONS ARE MADE, PROCEED AS FOLLOWS:
1
2
3
1
2
3
4

Dryer Operation
6
The inlet wet compressed air enters the dryer and is directed into tower “A” through the switching
valve. The wet air passes through the desiccant bed while the activated alumina strips moisture
leaving dry service air. A portion of this extremely dry air is passed through the fixed orifice shuttle
check valve and flows downward through tower “B” drying out the saturated desiccant and exhaust-
ing out of the purge muffler.
This “REGENERATING OPERATION” is actually two cycles: one for drying service air, and one for dry-
ing desiccant. After approximately five minutes, the switching valve redirects flow, repeating the
cycle. These cycles are reduced to two minute cycles if the -100ºF dew point is selected.
Required purge air is generally 15% of rated flow.
All Arrow Pneumatic Mini-Regen Dryers have less than a 2 PSIG
Maximum Pressure Drop at standard conditions.
• Your Arrow Dryer will give you years of service if the filters and drains ahead of
the dryer are properly maintained on a manufacturers recommended schedule.
• Arrow also suggest replacing the desiccant in the vessels approximately every
three (3) years.
• Operating conditions will have to be taken into consideration and the schedule
adjusted accordingly.
NOTE: BEFORE MAINTENANCE OF DRYER ALWAYS SHUT DRYER
OFF, DISCONNECT THE ELECTRICAL SUPPLY, AND DEPRESSURIZE
THE PNEUMATIC SYSTEM TO AVOID PERSONAL INJURY
DRYER OPERATION
MAINTENANCE

Parts Listing & Schematics
7
REPLACEMENT PARTS
MODEL
RH120/125
RH 115
RH 105/110
PART DESCRIPTION RH105 RH110 RH115 RH120 RH125
REPLACEMENT DESICCANT
(ACTIVATED ALUMINA) 126738 126738 126739 126740 126740
REPLACEMENT DESICCANT
(-100ºF DEW POINT)
(MOLECULAR SIEVE) 126741 126741 126742 126743 126743
PRESSURE GAUGE 126065 126065 126065 126065 126065
MUFFLER SQF-3 SQF-3 SQF-3 SQF-3 SQF-3
ON/OFF SWITCH 57300 57300 57300 57300 57300
5 MINUTE TIMER 120V 126707 126707 126707 126707 126707
5 MINUTE TIMER 220V 126750 126750 126750 126750 126750
2 MINUTE TIMER 120V
(-100ºF DEW POINT) 126708 126708 126708 126708 126708
2 MINUTE TIMER 220V
(-100ºF DEW POINT) 126751 126751 126751 126751 126751
SWITCHING VALVE 126067 126067 126067 126107 126107
SWITCHING VALVE
REPAIR KIT 126067-RK 126067-RK 126067-RK 126107-RK 126107-RK
ORIFICED CHECK VALVE 126081 126082 126084 126085 126093

ARROW PNEUMATICS, 2111 West 21st Street, Broadview, Illinois 60155
TEL: [phone] FAX: [phone]
www.arrowpneumatics.com
Warranty
The Arrow Regenerative type compressed air dryer is warranted to be free from
defects in material and workmanship, when used under conditions recommended by
the manufacturer, for a period of 12 (twelve) months fro date of shipment from
factory to job site of original owner. Products purchased from warehouse stock are
warranted for a period of 12 (twelve) months from date of shipment from that
warehouse provided Arrow is furnished full name, address and date of shipment
information.
This warranty is limited to parts and labor F.O.B. factory, and is subject to the same
restrictions as outlined below concerning misuse, abuse or accident.
This warranty will apply to equipment installed, operated, and maintained in
accordance with the procedures and recommendations as outlined in the owners
manual published by Arrow Pneumatics.
During the life of this warranty, Arrow Pneumatics will repair or replace (at Arrow’s
option) free of charge, F.O.B. its plant, any defective part of assembly, if such defect
occurred in normal service and was not due to apparent misuse, abuse, or accident.
Any warranty service performed in the field must be authorized by Arrow
Pneumatics. Unauthorized service voids the warranty and resulting charge will not
be paid by Arrow Pneumatics.
Arrow Pneumatics makes no other warranties or guarantees, expressed or implied.
The merchantability of the components is expressly excluded. The manufacturer
assumes no liability for indirect or consequential damage.
(This warranty good only in the continental boundary of the United States. For export, contact the factory)