Houdini Cooling Unit 1/2 Ton 3400H-ECX #35856

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SKU: 35856 3400H-ECX Houdini
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CellarPro 3400H-ECX Cooling Unit (P/N 35856). NOW WITH ENERGY-EFFICIENT EC FANS! CellarPro engineered the 3400H-ECX cooling unit specifically for shallow-depth glass wine cellars.

Just 13-inches deep and 14 1/2-inches tall, the 3400H-ECX Houdini cooling unit is designed to "disappear" inside - or atop - the cellar. Dual independent variable-speed fans offer flexibility to trade-off between super-quiet operation vs maximum performance.

For example, assuming 75F ambient temperature, R13 insulation in the non-glass walls and no ducting, the 3400H-ECX would work in the following cellars:

Cellar Dims
Cu Ft

Glass Sq Ft

Glass Pane

13'w x 2 1/2'd x 9'h293117 (Front Wall)Single60F3460
15'w x 2 1/2'd x 10'h375150 (Front Wall)Double55F3308
15'w x 2 1/2'd x 10'h375200 (Front & Side Walls)Double58F3326

All air-cooled refrigeration equipment requires fresh air intake to dissipate the heat generated by the cooling unit. The fresh air intake CANNOT come from the wine cellar space - it must come from space outside the cellar.

Powerful fans on the 3400H-ECX allow the cooling unit to be ducted without the need for an auxiliary fan, as follows:

  • Cold side:
    • Up to 100 equivalent feet (50' per duct) with 8-inch insulated ducting
    • Intake from the bottom, left, front, or top / exhaust from the bottom, front, or top
  • Hot side:
    • Up to 100 equivalent feet (50' per duct) and 85F maximum intake temperature (no auxiliary fan required)
    • Up to 200 equivalent feet (100' per duct) and 95F maximum intake temperature (requires auxiliary fan)
    • Intake from the right, front, or top / exhaust from the front, rear, or top
  • When ducting a Houdini cooling unit, our OEM duct hoods MUST be used, and the HIGH fan speed must be used
  • High fan speed is required for ducted airflows
  • CellarPro OEM duct hoods (sold separately) must be used to preserve manufacturer's warranty

Before purchasing this unit, let us calculate the thermal load of your wine cellar.


CellarPro's 3400H-ECX cooling unit (1/2 Ton Nominal) is designed specifically for glass-enclosed wine cellars, and uses energy-efficient variable-speed EC fans for maximum performance.

Features include:

  • Shallow height and depth
    • Fits shallow glass enclosures
    • 13"D x 14 1/2"H
    • 46"W
    • Can be placed inside the cellar, atop the cellar, partially installed in the cellar ceiling, or completely remote from the cellar (requires duct kit)
  • Choice of airflows for cold side
    • Intake from bottom, left, front, or top side
    • Exhaust from bottom, front, or top side
    • Air deflector optional
  • Choice of airflows for hot side
    • Intake from right, front, or top side
    • Exhaust from front, rear, or top side
    • Air deflector optional
  • Energy-efficient variable-speed EC fans with independent controls - choose between performance vs noise
    • Hot side - higher ambient temps require high fan speed
    • Low fan speed: 56 dBA / 85F maximum intake temperature
    • High fan speed: 61 dBA / 95F maximum intake temperature
    • Cold side - higher cooling load requires high fan speed
    • Low fan speed: 2737 SENSIBLE BTUH @ 55F / 47F lowest achievable cellar temperature
    • High fan speed: 3492 SENSIBLE BTUH @55F / 47F lowest achievable cellar temperature on hot, cold or both sides
  • Oversized stainless-steel drain pan with 200W heating element included as standard equipment
    • No drain line required for properly constructed, airtight cellars
    • Optional overflow drain fitting and 8' flexible drain line
  • Choice of power source
    • Side or rear
    • Removable 10-ft cord
  • Bottle probe is included as standard equipment and required for use in liquid
    • The bottle with the probe should be located in the top third INSIDE the cellar, in a central location with good airflow (ie not buried in the back nor in a corner)
    • We recommend using the probe in a bottle filled with water and 10% rubbing alcohol to keep the water from developing mold
  • Optional remote display

Please note:
If the cooling unit is partially or fully exposed to an environment outside the cellar, especially if the cooling unit will be located in an unconditioned or warm, humid environment, we recommend insulating the left 20-inches of the cooling unit with 1-inch closed-cell foam insulation (R-4 or better).

Our cooling units are designed to be used in properly-constructed wine cellars that are adequately insulated, airtight and sealed with a vapor barrier. In improperly constructed cellars, the cooling unit will create excess condensation, leading to damage and premature failure of your cooling unit (not covered by warranty).


  • Features energy-efficient EC Fans on both the cold and hot sides
  • This unit can be configured to pull fresh air ranging from -20 to 95F. If the unit's location does not provide sufficient room for the unit's exhaust to dissipate and/or fresh air to be provided, you may need to purchase a rear duct kit. We recommend the addition of a fan cycling switch when fresh air intake will be below 20F.
  • The unit must be placed indoors in an area that is above 32F.
  • Dual high-output fans come with independent variable speed settings for your choice of maximum cooling power at the high fan speed, or super-quiet operation (56 decibels) at the low fan speed.
  • Adjustable humidity control combines a high-output compressor with flexible fan cycles to maintain a recommended level of moisture inside your cellar.
  • Custom coils generate maximum cooling power inside the cellar.
  • Excess condensate is managed with a high-capacity stainless steel condensate pan and 200W electric heating element.
  • Commercial-grade Electrofin coating protects the evaporator coils from leaks and corrosion.
  • Intuitive LED display panel mounted on the evaporator with digital programmable thermostat is simple and easy to use. Remote thermostat is available as an upgrade.
  • Energy-saver mode, quick-chill mode, and auto-defrost cycle provide convenient solutions to common cellar needs.
  • Temperature set point range is 47F to 62F when the cooling unit is properly sized.
  • Unit operates with minimal vibrations and less noise than comparable units from competitors.
  • Audible and visual alarms and maintenance-needed indicator protect the cooling unit and the wine cellar.
  • With dual power sources and a 10-foot power cord, the unit can be plugged into a receptacle from either the rear or right side of the cooling unit, providing flexibility for most installations.
  • Common dedicated 15-amp circuit is required to power the unit.
  • Mounting brackets, included as standard equipment, ensure easy installation.
  • Removable steel case provides access to the internal components for servicing and repair.
  • CellarPro's 5-Year Standard Warranty, the most thorough in the industry, protects the unit against manufacturing defects.
  • An optional Extended Warranty (P/N 31488) is available for additional protection.
  • ETL Tested and Certified to rigorous UL Standards for safety.



  • CellarPro 3400H-ECX cooling units are self-contained, fully-charged units designed to be attached to the ceiling inside the cellar, or above the cellar.
  • 3400H-ECX units also can be located remotely from the cellar with the addition of one of our cold-side duct packages. Offered with or without insulated flex ducting, in a choice of configurations for low or high humidity conditions, our cold-side duct packages allow these cooling units to be ducted up to 50 equivalent feet away from the cellar and require 8-inch (or greater) ducting from start to finish.
  • When calculating equivalent feet, each 90-degree turn counts for 8 feet.
  • For remote or inaccessible installations, we offer a remote control display kit which is wired to the cooling unit and allows the digital display to be mounted inside or outside the cellar.
  • 3400H cooling units require fresh air intake without interference from the unit's hot air exhaust. If sufficient space does not exist to provide fresh air, you may need our hot-side duct kit.
  • The cold side of the cooling unit should never be exposed to temperatures below 32F.
  • A CellarPro cooling unit must always be used in the upright position, and should never be operated on its side or upside down.

Specs & Resources

Brand: CellarPro

UPC: 077757358562

Size: 46w x 13d x 14 1/2h (in)

115V AC / 60 Hz
Compressor Amps:
- Startup (LRA): 40.0 Amps
- Unit Amp Rating: 10.26 Amps
- Total Watts with Fans on High: 807
- Total Watts with Fans on Low: 791
- Compatible with Dedicated 15-Amp Circuit

BTUH @ 55F:
- Low Fan Speed: 2737 BTUH
- High Fan Speed: 3492 BTUH
- 1/2 Ton Nominal

Sizing Table: Click here to view sizing table

Warranty Resources
- Warranty Overview
- Limited Warranty - 2 Years (Entire System) / 5 Years (Compressor)
- Optional Extended Warranty (sold separately).

Click on one of the following links for more information:

Options & Upgrades

Cold Temperature
CellarPro 3400H Houdini units must be located in environments ranging from 40F to 95F

  • Compressor Heater #1727: protects the unit when installed in environments that drop below 40F down to 20F.
  • Fan Cycling Switch #6972: supports the unit in temperatures below 20F and as low as -20F when combined with our compressor heater.

Duct Hoods

  • Hot Side Duct Hood#36026 and Kit #36027: allows you to install the unit in a small space with limited airflow, and duct the airflow up to 100 equivalent feet (50 feet per duct)
  • Hot Side Duct Kit w/ Inline Fan#36028: allows you to install the unit in a small space with limited airflow, and duct the airflow up to 200 equivalent feet (100 feet per duct)
  • Cold Side Duct Hood#36024 and Kit #36025: permits the cooling unit to be located remotely, up to 50 equivalent feet away from the cellar (cold side), and duct the airflow up to 100 equivalent feet (50 feet per duct)
  • Duct Kits are the same as Duct Hoods, and also include 2 x 25-feet of 8-inch insulated (R-6) flex ducting.

Filters & Grills

  • Use our filter & grill guide to find the cooling unit filter or duct filter and/or duct grill that is appropriate for your cooling unit.


Remote Control & Probe

  • Remote Display #1603: lets you place the digital panel wherever you want, whether inside or outside the cellar. Includes 10 feet of wiring.
  • Bottle Probe #1434: this remote thermostat with a 10-foot cord overrides the thermostat on the face of the cooling unit, and allows it to monitor air or liquid temperatures at various locations inside the cellar. Included.
  • Bottle Probe Extension Cords available in 25-foot (#1780) and 50-foot (#1781) lengths.

Other Options & Upgrades

  • Condensate Drain Line: strongly recommended for wine cellar installations that are not airtight, a drain line allows excess moisture to drain from the the cooling unit (#1606).

Nobody protects your wine cellar better than CellarPro Cooling Systems! In the event your cooling unit fails and the failed components are covered by our warranty, we'll send a replacement cooling unit to you per the terms of our Replacement Unit Program

CellarPro Replacement Unit Program
If your CellarPro cooling unit fails and the parts that failed are still covered by warranty, we'll send a replacement cooling unit to you, as follows:

  1. Your cooling unit must be registered at CellarPro
  2. Your cooling unit must have been properly sized, installed and maintained
  3. Your cooling unit may not have been permanently modified, damaged or disfigured

Please note:

  • Replacement units are factory-refurbished cooling units with a similar build date as your original unit
  • You are responsible for the shipping cost to send the replacement unit to you and return the original unit to us, and the cost (if any) to remove the original unit and install the replacement unit
  • In order to send a replacement unit, we require a deposit, which will be refunded minus shipping costs upon the return and pending the inspection of the original unit
  • If the original unit failed due to improper installation or use, the failure is not covered by warranty and we will deduct the cost of the repairs from the refund of your deposit


What is "Sensible BTUH"?

A: You should always use Sensible BTUH* when comparing different brands of cooling units, and when sizing a cooling unit for your wine cellar. Every cooling unit produces a certain amount of Total BTUH, which is the sum of Sensible BTUH (lowers the temperature) and Latent BTUH (lowers the relative humidity). Because our goal is to cool wine cellars while preserving humidity, wine cellar cooling units should have high Sensible BTUH and low Latent BTUH. The relationship between Sensible and Latent BTUHs is know as SHR (Sensible Heat Ratio), which is calculated as Sensible BTUH/Total BTUH. The SHR for CellarPro cooling units is greater than 90%, which means that CellarPro units provide maximum cooling power without stripping out humidity from the cellar environment.

*CellarPro Sensible BTUHs are calculated assuming 55F cellar temperature, 60% relative humidity and 95F ambient for all units except 1800 units (85F ambient).

How cold can the temperature be where the cooling unit pulls air?

A: For installations in environments below 40F down to 20F, we recommend adding our compressor heater (P/N 1727), which is included as standard equipment on all outdoor units. Below 20F, in addition to the compressor heater, we recommend adding our fan cycling switch (P/N 6972)

Does the unit really need a dedicated circuit?

A: First, the background. Unlike our competitors, we build our cooling units with precision expansion valves, not cap tubes, which means that our cooling units aren't limited to a 30F differential between the desired cellar temperature and the ambient temperature. Cooling systems with expansion valves are much more precise than cap tubes, and much more sensitive to low voltage conditions, which is why our units require dedicated circuits. When we say "dedicated circuit", we mean that the circuit shouldn't have any items that require heavy draws of electricity - eg other appliances, vacuum cleaners, big-screen TVs, blow-dryers - on the same circuit as the cooling unit. Lighting, computers or other low-draw items shouldn't be a problem on the same circuit.

Can the cooling unit be located in a remote location and ducted to/from the wine cellar?

A: These cooling units can be ducted up to 50 equivalent feet away from the wine cellar when used with our cold-side duct hoods and kits. Remember that cold-side ducting must be insulated and additional load should be added to properly size the required cooling unit.

Can I install the entire unit inside the cellar?

A: These cooling units can be installed completely inside the wine cellar, attached to the ceiling, with the hot air exhaust and fresh air intake pushed to and pulled from the space above the cellar.

If I don't have sufficient space to pull fresh air, is that Ok?

A: The hot side of the cooling unit generates hot air that must have sufficient space to dissipate, otherwise the unit will recycle its own hot air. The hot air exhaust and/or intake can be ducted to another location with our hot-side duct hoods and kits, which allow supply and return airflows to be redirected to and from a temperature controlled environment OUTSIDE the cellar.

Can I use the low fan speed setting on the cooling unit when the unit is ducted?

A: Duct hoods and kits create additional static pressure and therefore require the use of the high fan speed to overcome the additional static pressure.

Do I need the condensate drain line?

A: If you are using the cooling unit in an airtight cabinet or cellar, you probably don't need the drain line. To the extent that condensate is created, the 200W heating element inside the cooling unit reduces drainage as it helps to burns off condensate before it reaches the drain line. However, if your cabinet/cellar was built without a vapor barrier, or there are gaps where the door(s) closes against the cellar, you will need the drain line to allow excess condensate a path to be released to a designated location.

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