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Guardian DP21 NEMA 12, 3R & 4
Air-Cooled Panel-Mounted Air Conditioners

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NEMA
TYPE 12, 3R & 4
MAINTAINED
$2,583.00
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QuantityPrice Each
1$2,583.00
2-4$2,532.00
5-9$2,325.00
10-24$2,170.00
25-49$2,015.00
50-99$1,938.00
100+$1,886.00
76 in stock. Ships in 2-3 business days.
Order 1 more and pay $2,532.00 each
Select Model Type

Electrical (Volts/Hz):

ModelNEMA
Rating
UL/CUL
Listed or
Recognized
BTU/H
Capacity
95/95
Rating
BTU/H
Ambient Temp.VoltsHzRunning
Amps
Approx.
Weight
°F°C
Max./Min.Max./Min.lbskg
KNA4C3DP21L4Listed30002470131/-2055/-28115/10060/506.0/5.05425
115V 60 Hz models perform at reduced capacity when operated at 100V 50 Hz.
Rating shown is for operation at maximum ambient temperature.

TECHNICAL DATA

ModelNEMA
Rating
BTU/H
Capacity
Volts/Hz
KNA4C3DP21L43000115/60V, 60/50Hz
UL/CUL Listed or Recognized: Listed
95/95 BTU Rating: 2470
Ambient Max./Min. °F: 131/-20
Ambient Max./Min. °C: 55/-29
Running Amps: 6.0/5.0
Approx. weight: 54 lbs. (25 kg)
115V 60 Hz models perform at reduced capacity when operated at 100V 50 Hz.
Rating shown is for operation at maximum ambient temperature.
This equipment is not intended for use in corrosive environments. Such use voids the warranty. The corrosion resistant coating option must be specified for equipment to be used in corrosive environments. This model is also available with a NEMA 4X rating as the GuardianX DP21LV which includes Internal Corrosion Protection and a Stainless Steel Shell as standard features.
  • Standard Features
  • Accessories & Options
  • Airflow Diagram
  • Performance
  • Arrangement
  • Similar Models
  • Documents
  • 360° View
• Baked Powder Finish
Heavy-duty steel shell with powder-baked finish (ANSI 61 gray). Custom color options are available.
• Built-in Condensate Evaporator
Built-in Condensate Evaporator eliminates need for draining condensate under normal operating conditions. May not be adequate in extremely high humidity with open or leaky enclosure. Overflow condensate drain fitting and hose are included.
• CFC-Free Refrigerant
CFC-free R134a Refrigerant is used
• Closed-Loop Cooling
The enclosure interior airflow system is isolated from the ambient airflow or waterflow system. No ambient air can invade the cool, dehumidified sensitive component compartment.
• Compressor Short Cycle Protector
Protects the compressor from possible damage due to harmful short cycling, (frequent starting) where temperature controls enable the compressor to restart frequently or after a power interruption. These conditions could be due to low or fluctuating heat loads within the electrical enclosure or a power failure. The Compressor Short Cycle Protector will prevent the compressor from starting when it has been shut off for less than several minutes or the power was interrupted. By limiting the number of compressor starts per hour, the life of the compressor is prolonged. It is recommended where installations are subject to solar gain and or changes in the enclosure internal load due to the degree of usage of the equipment being cooled. It is also recommended where higher capacity units are specified in anticipation of the future addition of heat producing equipment being added to the enclosure.
• Condenser Blower Controller
• Epoxy-Coated Condenser and Evaporator Coils
Condenser and Evaporator Coils are Epoxy-Coated. This coating will withstand 1000 hours of salt spray per the ASTM B 117 test method. Also see Stainless Steel Cabinet or Integrity NEMA 4/4X Air Conditioners. NOTE: Severe operational environments such as waste water treatment and salt spray are likely to cause corrosion failure over a period of time regardless of coating. Warranty: Corrosive conditions may affect the warranty coverage. Consult factory for warranty limitations in corrosive environments. NOTE: For additional corrosion protection options, contact factory.
• Filter
All Kooltronic filters consist of a multi-layer grid of sturdy corrugated aluminum, securely held in a one-piece aluminum frame. Filters are required wherever air is drawn into an electronics enclosure or related cooling equipment to keep internal parts as clean as possible. A non-drying adhesive coating traps a high percentage of particulate matter. These filters are reusable, they may be washed and recoated with the appropriate filter recoating adhesive. Replacement filters are available and can be ordered online at kooltronic.com/spareparts.
• Heavy-Duty Steel Shell
• NEMA 12, 3R & 4 Ratings Maintained (UL50)
All units are fully gasketed for tight, leakproof installation, in compliance with the NEMA Type 4 Enclosure Ratings.
• Programmable Temperature Alarm
All models feature a programmable temperature alarm to alert if early action is required.
• Programmable Thermostat
All models feature a programmable thermostat, allowing more accurate and versatile performance features.
• Six-Foot [1.8m] (minimum) 3-Wire Power Cord
• UL/CUL Listed

• Adapter
A plate or plenum needed to replace older Kooltronic or competitor units.
• Enclosure Heater
Eliminates damaging condensation, increasing reliability of electrical enclosure components.
• Internal Corrosion Protection
This protection increases reliability in hostile environments. This protection for the refrigeration system consists of an air cured coating applied to the brazed joints on the condenser side, providing a degree of protection from corrosive environments. This coating will withstand 1000 hours of salt spray per the ASTM B 117 test method. Also see Stainless Steel Cabinet or GuardianX Air Conditioners. NOTE: Severe operational environments such as waste water treatment and salt spray are likely to cause corrosion failure over a period of time regardless of coating. Warranty: Corrosive conditions may affect the warranty coverage. Consult factory for warranty limitations in corrosive environments. NOTE: For additional corrosion protection options, contact factory.
• Remote Monitoring
An optional feature for models with a Programmable Thermostat, Remote Monitoring provides temperature data for warning of early action required. This is accomplished through a Hot Key connection from the Programmable Thermostat to a monitoring system (not supplied) that is ModBus-RTU compatible (i.e. XWEB500/3000/300) via an external 2-position terminal block.
• Remote Thermostat Relay
Used only with a user-installed remote thermostat or the Kooltronic KLLC100 Lead Lag Controller, this 24VAC relay can be used for the sequential operation of two units or with a single unit. An external terminal strip is provided for field interconnection. NOTE: User-installed thermostat must have a set point of 75°F with a differential of 11°F. NOTE: A factory installed thermostat is not provided with this option.
• Replacement Filters
All KOOLTRONIC filters consist of a multi-layer grid of sturdy corrugated aluminum, securely held in a one-piece aluminum frame. Filters are required wherever air is drawn into an electronics enclosure or related cooling equipment to keep internal parts as clean as possible.,A non-drying adhesive coating traps a high percentage of particulate matter. These filters are reuseable, they may be washed and recoated with the appropriate filter recoating adhesive. Replacements are available for those which become damaged or otherwise non-serviceable.
• Special materials or finishes
• Special motors, line cords or connectors
• Stainless Steel Shell
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Airflow Diagram Thumbnail
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Guardian DP21airflow diagram

Dimensions, inches [mm], are for reference only and subject to change.

Guardian DP21 performance chart
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General Arrangement Thumbnail
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Guardian DP21 general arrangement drawing
Dimensions, inches [mm], are for reference only and subject to change.

Dimensions, inches [mm], are for reference only and subject to change.
ModelGuideline
Dimensions
(H x W x D)*
CFM @0" S.P.
Guardian DP1515.48 x 8.12 x 7.060
Guardian DP15LV15.48 x 8.12 x 7.060
*See model specifics for drawings, dimensions, mounting or cutout plans.
  • 2-D Drawing of the Mounting Plan
    KNA4C3DP21L and/or LV Drawing of the Mounting Plan [38Kb]
  • 3-D Solid Model
    KNA4C3DP21L and/or LV Solid Model [4799Kb]
  • Brochure
    Guardian/GuardianX 480 Volt Series Brochure [447Kb]
    Guardian/GuardianX Series Brochure [447Kb]
  • Data Sheet
    Guardian/GuardianX Series DP21L-LV Product Data Sheet [1798Kb]
  • GA Drawing
    Guardian/GuardianX Series DP21 General Arrangement Drawing [74Kb]
    Guardian/GuardianX Series DP21 General Arrangement Drawing W/ Programmable T-stat [82Kb]
  • Installation Instructions
    Guardian/GuardianX Series DP21 Installation Instructions (2 pages) [158Kb]
  • Literature
    Air Conditioner Quick-Sheet [105Kb]
    Condensate Evaporator Kits [241Kb]
    Condensation and Electronics [3983Kb]
    Electronic Enclosure Cooling With Special Purpose Air Conditioners [254Kb]
    Hazardous Location Series White Paper [234Kb]
    Increasing the Lifespan and Reliability of Electrical Components [212Kb]
    Slimkool Series Flyer [584Kb]
    Kooltronic Custom Capabilities Flyer [2194Kb]
    Kooltronic Custom Cooling Medical Flyer [211Kb]
    Kooltronic Design Guide/Catalog (220 pages) [229400Kb]
    Kooltronic Refrigeration System Manufacturing [55Kb]
    Kooltronic Standard Warranty [55Kb]
    Kooltronic Unit Longevity Press Release [167Kb]
    NEMA Enclosure Ratings [91Kb]
    Short-Form Catalog (16 pages) [897Kb]
    Airflow Switch Data Sheet [159Kb]
    Laboratory Environmental Testing Services [157Kb]
    Powder Paint Application Facilities Flyer [165Kb]
  • Operator's Manual
    KLLC100 Lead-Lag Controller (Discontinued) [38Kb]
    KLLC480 Lead-Lag Controller [79Kb]
    Guardian/GuardianX Series DP21 Operator's Manual [580Kb]
  • Wiring Diagram
    Guardian/GuardianX Series DP21 Wiring Diagram (Low Temp. T-stat - Ladder) [43Kb]
    Guardian/GuardianX Series DP21 Wiring Diagram (Low Temp. T-stat - Point-to-Point) [62Kb]
    Guardian/GuardianX Series DP21 Wiring Diagram (Prgm. T-stat - Ladder) [50Kb]
    Guardian/GuardianX Series DP21 Wiring Diagram (Prgm. T-stat - Point-to-Point) [64Kb]
    Guardian/GuardianX Series DP21 Wiring Diagram (Prgm. T-stat - Point-to-Point) [69Kb]
    Guardian/GuardianX Series DP21 Wiring Diagram (Prgm. T-stat - Point-to-Point) [67Kb]
    Guardian/GuardianX Series KNA4C3DP21LD Wiring Diagram (Point-to-Point) [68Kb]

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Many popular units are available as 3D solid models for customer system integration. Contact Kooltronic for details.

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