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18063 Rev E  06/17

(800) 234-4239

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Environmental Technology, Inc.

Model EDH–4 Rev E Installation and Operation Manual

Mounting

Install this unit in compliance with National Electrical Code (NEC) and Canadian Electrical Code (CEC) 

standards, as well as all other local and applicable electrical codes for your area. Prior to beginning installa-
tion, make sure that the facility has properly sized electric service and breaker. For additional information re-
garding electrical ratings and facility power requirements, refer to the Specifications section of this manual.

The EDH–4 mounting brackets will accommodate fasteners up to 1/4 inch (6.3 mm) in diameter.  The 

choice of anchors and companion hardware should be appropriate for the mounting surface.  At least four 
anchors should be used and each should be capable of supporting a combined load of at least 5 pounds (2.4 
kg).  The locations of the mounting points are shown in Figure 3A, Narrow, and Figure 3B, Wide.

5.22"

132.6mm

13.63"

346.1mm

12.63"

320.7mm

2.25"

57.2mm

4.81"

122.2mm

7.00"

177.8mm

19.00"

483mm

18.00"

457mm

Figure 3A. EDH–4 Rack Dimensions: Narrow

Figure 3B.  

EDH–4 Rack 

Dimensions: Wide

Figure 4. EDH–4  

Wall Mounting

Mounting

Points

Mounting

Points

Mounting

Points

Mounting

Points

For wall mount installation, rather than attaching the mounting 

brackets at the holes along the 4.81" (122.2mm) edge (Figure 4A), align 
and attach them to the holes along the 7" (177.8mm) edge (4B). Pro-
ceeding clockwise, the unit is reoriented with the mounting brackets 
against its mounting surface (4C), the front display panel (with handles) 
swapping positions (4D) with “eTi” front cover (4E).

The surface used for the installation should be capable of supporting 

four times the weight of the unit, or about 32 pounds (14.5 kg). Be sure 
to install the unit directly to a solid, stable surface. Mount the unit to the 

wall (or other vertical surface) before con-
necting any other components to it.

A

E

B

C

D

Summary of Contents for EDH-4

Page 1: ...e Manage Heat MANUAL Low Cost Air Dehydrator MODEL EDH 4 Environmental Technology Inc 1850 N Sheridan Street South Bend IN 46628 574 233 1202 Fax 574 233 2152 Toll Free 800 234 4239 Fax 888 234 4238 w...

Page 2: ...ehydrator are capable of generating as much as 1 2 psig 82 7 mbar Proper safety practice requires treating all pneumatic components with care Operating Temperature Verify adequate air flow and power s...

Page 3: ...Additional Equipment Required for Installation 6 Initial Inspection 6 Location of Installation 6 Mounting the EDH 4 7 Preparation and System Set up 8 Principal Considerations 8 Power Connection 8 Pne...

Page 4: ...into the transmitter from the antenna when the antenna is not tuned properly Water in the transmis sion line will de tune the antenna and cause a higher VSWR PART NUMBER DESCRIPTION 18138 Desiccant ED...

Page 5: ...itions reduce system performance Description The EDH 4 Air Dehydrator is an economical manually regenerative air dehydrator for waveguide envi ronments Air is pressurized by a twin head vibratory pump...

Page 6: ...procedure Defective operation to test effective operation 1 Attach power to the EDH 4 2 Seal outlet plug thumb or kink in hose 3 Pump stops 4 LED display reads between 30 and 50 5 Remove seal LED disp...

Page 7: ...least 5 pounds 2 4 kg The locations of the mounting points are shown in Figure 3A Narrow and Figure 3B Wide 5 22 132 6mm 13 63 346 1mm 12 63 320 7mm 2 25 57 2mm 4 81 122 2mm 7 00 177 8mm 19 00 483mm 1...

Page 8: ...recommended to account for this buildup Power Connection The EDH 4 uses a universal 100 VAC to 240 VAC at 50 60 Hz power supply This eliminates the need to set voltage during the installation or havi...

Page 9: ...re in SI units is 99 mbar displayed as 99 the decimal point displayed to the lower right of the numerals indicates mbar mode To assess the Percentage Desiccant Absorption Capacity remaining quickly pr...

Page 10: ...replace or regenerate the desiccant This alarm is reset by depressing MODE during power up Both relays close at power off Table 2 near right Alarm Relay Connector Pin Assignments Figure 7 far right E...

Page 11: ...en recorded a Change Desiccant two letter error code CD on the front panel display is issued to indicate a need to regenerate or replace the desiccant PRESSURE SOUTH BEND INDIANA U S A www networketi...

Page 12: ...ote Servicing should be performed by qualified personnel The desiccant used in the EDH 4 Dehydrator is known as an indicating silica gel Care should be taken to prevent the dust from entering the resp...

Page 13: ...ottle on the EDH 4 is accessible below the top panel The steps are 1 Remove power and vent system of pressurized air 2 Remove four 4 attachment screws from top panel Fig 11 lift and remove top panel 3...

Page 14: ...ube under control panel wiring Brown tube to Pump Pump Brown tube to Pump When reinserting the desiccant bottle into the EDH 4 note the mark next to the nozzle on the bottom of the bottle This mark in...

Page 15: ...PRESSURE LED display If the silica particles are white renew the desiccant Refer to the Maintenance section of this manual HF Low Temperature Verify that the electronic enclosure temperature is above...

Page 16: ...Type Non Programmable Single Can ister Desiccant Dehydrator Regeneration Method Manual Regeneration or Replacement Regeneration Indication Desiccant Color Change and Compressor Run Time Outlet Dew Poi...

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