Delta-T EL-20C Series User'S & Technical Manual Download Page 8

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4421 Tradition Trail ● Plano, Texas 75093 ● 972-964-2700 ● 800-836-7472

URL:

www.iscenclosurecooling.com

● Email:

[email protected]

SP-ENG-211-000-19 Rev 1.0

P a g e

Unit Speci fica tions

The following table provides electrical and refrigeration specifications for the EL-20C Series Air
Conditioners.

EL-20C Series

Nominal Capacity Rating: 20,000 BTUH
Standard Maximum Ambient: 140°F
Unit Weight: 230VAC

– 170lbs, 480VAC – 247lbs

Model

Operatin

g Voltage

Range

(Volts)

Inrush

Current

(Start

Current)

(Amps)

Loading

Current

(Running

Current)

(Amps)

SCCR

(Short

Circuit

Current

Rating)

(Amps)

Recommended

Circuit

Protection

(Amps)

KVA

Rating

Refrigerant

Type

Refrigerant

Amount

(ounces)

Low/High

Unit

Pressures

(psi)

EL-20C-236

207-253

12.47

20 Amp Class

CC, CCMR

Time Delay *

2.9

R407c

86/353

EL-20C-486

414-506

6.30

15 Amp Class

CC, CCMR

Time Delay *

3.0

R407c

86/353

* HACR Type Circuit Breakers or Time-delay Fuses with the following electrical characteristics are recommended.
Fast-acting fuses are not recommended.

% of Ampere Rating

Opening Time

110 %

15min Minimum

125 %

1hr Maximum

200 %

12sec Minimum
4min Maximum

SCCR rating is based on the SCCR rating for the circuit protection device installed in the panel / enclosure per

UL50 & UL508a to protect the AC unit. Typically 100KA

– 200KA for Time-Delay Fuses.

Summary of Contents for EL-20C Series

Page 1: ...User Technical Manual EL 20C Series Rev 1 0 ...

Page 2: ...tain proprietary information comprising ISC Inc s trade secrets Please maintain the confidentiality of all proprietary information during and after the term of the use agreement Also please refrain from using this proprietary information in any other manner including in any other business without ISC Inc s written approval ISC Inc reserves the right to revise and otherwise modify the Manual to ref...

Page 3: ...ner 4 Moving the Air Conditioners 5 Unit Label 5 Operation 5 Preliminary Testing 6 Mounting the Air Conditioner 7 Unit Specifications 8 Options 9 System Faults 12 Digital Temperature Controller Programming 12 Preventative Maintenance 15 Field Serviceable Parts 17 Safety Information 18 Troubleshooting Guide 19 Physical Dimensions 23 Electrical Schematics 24 Warranty Information 25 Return Material A...

Page 4: ...quipment DELTA T air conditioning equipment is designed manufactured and packed to prevent damage from normal handling shock and vibration during shipment It is necessary to inspect your equipment upon receipt to ensure that there is no visual or hidden damage Upon receipt of the equipment ensure that it is always top side up as indicated by THIS SIDE UP labels This ensures that the compressor oil...

Page 5: ... the template below and keep this information in a safe place for warranty and ordering parts To prevent damage to equipment electrical panel and wiring and to prevent personal injury assure that the power source is compatible with the equipment before operating When recharging refrigeration type and amount must be the same as shown on the unit label or air conditioner will not operate properly or...

Page 6: ...ic power is protected by a circuit protection device refer to the Unit Specification section in this manual for proper circuit protection sizing Connect a power source to the air conditioner and turn on the power switch The evaporator fan will start and the digital controller will power up If cooling is called for the compressor will start in 3 minutes If desired change the cooling set point Refer...

Page 7: ...osure use the fasteners supplied to attach the air conditioner to the enclosure Ensure that these fasteners are tight in order to prevent the unit from falling off the enclosure These fasteners should be checked periodically to ensure that they have not become loose due to vibration The air conditioner is provided with a power cord or a power terminal block Ensure that the power supplied is compat...

Page 8: ...rcuit Current Rating Amps Recommended Circuit Protection Amps KVA Rating Refrigerant Type Refrigerant Amount ounces Low High Unit Pressures psi EL 20C 236 207 253 50 12 47 2 20 Amp Class CC CCMR Time Delay 2 9 R407c 36 86 353 EL 20C 486 414 506 25 6 30 2 15 Amp Class CC CCMR Time Delay 3 0 R407c 36 86 353 HACR Type Circuit Breakers or Time delay Fuses with the following electrical characteristics ...

Page 9: ...mum constant low current in the compressor motor during the non cooling state This option provides internal heat to the compressor to protect it from stalls and hard starts during long periods of compressor off state Dry Contact This option provides an early warning capability to your enclosure to aid in the protection of your expensive equipment The Dry Contact is programmed with an individual dr...

Page 10: ...mperature has reached 55 F Refer to Advanced Digital Temperature Controller Programming section on this manual for details on changing these parameters Special Programming All DELTA T Air Conditioners have a Special Programming option for selecting unique pre in programmed settings for special requirements Although most parameters are accessible in our digital controller this option allows you to ...

Page 11: ...rom a remote location with a PLC Full specifications will be provided with this option For full details refer to the Ethernet IP Option Specifications included with the Air Conditioner Remote Controller When having our Programmable Digital Controller mounted on the face of our Air Conditioner does not fit your application DELTA T offers the Remote Controller option This option moves the controller...

Page 12: ...isplay of the digital temperature controller and the compressor will turn off after a 2 minute time delay A thermal overload protects the compressor against faults In the event that the snowflake status LED is on but is not flashing and the compressor is not running an internal fault may have occurred Refer to the Troubleshooting Guide in this manual Digital Temperature Controller Programming For ...

Page 13: ...n 7 seconds The Pr2 label will be displayed immediately followed by the HY parameter 3 Select the required parameter by pressing the UP or DOWN arrow key Press the SET key to display its value 4 Use the UP or DOWN arrow key to change its value 5 Press SET to store the new value and move to the following parameter To exit Press SET UP arrow keys or wait 15 seconds without pressing a key Note The se...

Page 14: ... Heater and Dry Contact options are included these parameters only control Heater Settings Dry Contact is controlled by ALU Alarms Signals Message Cause Actions P1 Enclosure Probe Failure Start and stop of the compressor after 15 minute intervals 2 P2 Condenser Probe Failure No Action Alarm Only 2 HA Maximum Temperature Alarm P1 105 F for 3 minutes after initial 30 min startup delay Activate Dry C...

Page 15: ...e cut off switch which will stop the compressor if the condensing pressure becomes too high due restricted condenser air flow or some other cause Restricted air flow due to neglecting a dirty filter will cause unit to repeatedly turn off and then turn back on after it cools off An operation in this safety cycling mode will eventually damage the equipment and void the warranty Refer to Field Servic...

Page 16: ...for proper replacement Note that the rotary compressor runs with compressed refrigerant gas on the outer case and therefore is hot to the touch Loss of Refrigerant DELTA T air conditioners are meticulously leak and run tested after assembly If a leak in the system should develop due to shipping damage or mechanical vibration the leak must be detected repaired and the refrigerant charge restored to...

Page 17: ...robe 52126 1 2 25M x2 for Cooling models only 52126 2 2 1 5M x1 for Cool plus Heat models Temperature Probe Mounting Clip 52126 375C Thermal Expansion Valve TXV 32016 1 Compressor 31640 1 Gasket Installation Kit 71404 HC15 Evaporator Fan Motor 41060 2 1 Condenser Fan Motor 41060 2 1 Filter Media 44204 12 pack Capacitor 54005 1 Compressor Relay 55754 1 Voltage Part Description ISC Part 480 Digital ...

Page 18: ...equirements of the UL484 specification When working with the DELTA T Air Conditioner always makes sure shroud is installed Verify proper voltage is applied to unit as specified in the UL label of the Air Conditioner In the event of a field service repair power down unit using the power on off switch and disconnect power from unit It is always recommended to use a licensed Air Conditioner Technicia...

Page 19: ... position ON OFF Toggle Switch then Retry Verify input power meets voltage requirements as shown in the UL label YES If problem is still present contact technical support Unit Overheats Insufficient Cooling Is Filter Clean NO Clean Replace Filter YES Are Condenser Evaporator Fans ON NO Check for Faulty Fan replace YES Is Condenser Coil dirty YES Clean Coil NO NO Is Evaporator Coil Frozen Iced YES ...

Page 20: ... Use meter3 Check for faulty evaporator fan3 Measure Temperature at Evaporator Verify Heat Load Requirements Is unit capacity adequate for internal head load Possible low refrigerant Is compressor thermal overload open Use ohm meter 3 Check for error code CA LA HA LA2 HA2 P1 or P2 YES NO Check contactor circuit Does it have power 3 NO YES Refer to Alarm Signals in Digital Temperature Controller Pr...

Page 21: ...controller CA YES NO Check Low Pressure Switch Connections and Verify Pressure switch is closed Use meter 3 P1 or P2 NO YES Check probe connections potential faulty probe LA LA2 HA HA2 YES Refer to Alarm Signals in Digital Temperature Controller Programming Section Fuse Circuit Protection Nuisance Trip Is fuse opening as soon as unit turns on NO YES Check incoming power supply and connections for ...

Page 22: ...22 P a g e Water overflow excessive Check drain is it plugged YES NO Clean condensate pan and drain add 1 tbsp bleach to upper pan monthly to kill mold Is Air Conditioner sealed against enclosure properly tightly sealed and door closed YES Contact Customer Service NO Ensure air tight seal between air conditioner and enclosure Make sure door is closed ...

Page 23: ...4421 Tradition Trail Plano Texas 75093 972 964 2700 800 836 7472 URL www iscenclosurecooling com Email iscinfo iscsales com SP ENG 211 000 19 Rev 1 0 23 P a g e Physical Dimensions ...

Page 24: ...les com SP ENG 211 000 19 Rev 1 0 24 P a g e Electrical Schematics System Schematic Digital Controller Schematic Note Schematics apply to all voltages optional accessories wiring not provided in this document If you require electrical schematic with options contact our technical support and provide your model number ...

Page 25: ...han its designed purpose or operating conditions Operation in harsh oily corrosive or other abnormal environmental conditions without the proper filtration sealing protective coatings and or weather protection or cosmetic corrosion that does not affect operation Damage to hermetic system resulting from continuous operation with dirty or clogged air filters or improper or negligent maintenance Use ...

Page 26: ...del Number Serial Number Customer name and contact info email phone number and address Shipping method Pack unit in a suitable packing for shipment preferably the original packaging if available Air Conditioners must be returned in an upright position properly secured to a pallet Tip unit to empty water from the evaporator and boil off pans Clearly mark the RMA number on the box Customer will pay ...

Page 27: ... wires to air conditioners equipped with a Wago power terminal block 1 Remove cover from chassis using T25 Torx bit 2 The sequence of the connecting the wires is from LEFT TO RIGHT 3 Connect each wire as shown by lifting the lever and inserting the wire into the receptacle directly below Snap the lever down to secure the wire in place 4 If wires need to be removed raise the lever directly above ea...

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