Coldzone A2L Next Gen All-Temp Low Profile Unit Cooler

Features

Coldzone's All-Temp unit coolers pioneered the low profile, air draw-through design, establishing the industry standard for walk-in coolers, freezers, and various other applications. The Next-Gen All-Temp models represent an advancement, featuring a new fan guard design and deep draw venturi for optimized airflow and enhanced serviceability. These units are compatible with multiple refrigerants and are available in both air and electric defrost configurations.

Sizes

Available in a wide array of sizes, these units offer capacities ranging from 2,700 to 45,900 BTUH at a 10° TD. Models with one to six fans are available, providing airflow from 800 to 4,650 CFM.

Housing

The lightweight yet durable embossed aluminum casing is engineered to prevent short cycling of the discharge air through baffled fan sections. These units meet NSF requirements and are designed for flush ceiling mounting. The top panel includes 1/2" wide slotted mounting points for straightforward installation. The drain pan features a removable drain fitting at the bottom for easy field connection and replacement. End panels slide out from the front, offering convenient access to the electrical and piping compartments for simplified maintenance.

Coil

The coils feature high-efficiency 3/8" enhanced copper hairpins, staggered and mechanically expanded into corrugated aluminum fins for maximum heat transfer and reduced refrigerant charge. Die-formed fin collars ensure consistent fin spacing. Models are available with 4 or 6 fins per inch (FPI). Sweat connections are standard.

Motors

Standard models are equipped with highly efficient Dual Speed Electronically Commutated (EC) motors, available for 115V or 208-230V. These motors comply with California Title 24 regulations and include thermal overload protection.

Fans and Fan Guards

Heavy-duty 12" aluminum fans are balanced for vibration-free operation. An improved black plastic fan guard design and deep draw venturi contribute to optimal air patterns.

Refrigerants

Low Profile Unit Coolers are optimized for multiple A2L refrigerants, including R454A, R454C, and R455A. Please specify refrigerant requirements when ordering. A separate compartment is provided for all refrigerant connections, allowing for internal mounting of expansion valves.

Electrical

Units are available for 115V and 208-230V. A spacious electrical compartment is integrated within the unit for housing electrical components, easily accessible by removing the slide-out end panel. All models are UL and cUL listed and are available for 60 Hz or 50 Hz applications.

Air Defrost Models

Air Defrost models are designed for use in coolers operating at 35°F and warmer. All components are factory wired to convenient screw-type terminal strips.

Electric Defrost Models

Electric Defrost 6 FPI models are suitable for coolers and freezers between 34°F to -20°F. Electric Defrost 4 FPI models are designed for freezers between 32°F to -20°F. Defrost heaters are mounted on the air intake side for optimal performance and easy maintenance. An additional lower heater is installed in the drain pan for fast, reliable drainage. A defrost termination fan delay thermostat manages the defrost cycle, and a heater safety thermostat prevents overheating.

Optional Features

• EcoNet® Enabled Controller¹ (factory-installed)
• EcoNet® Command Center (loose)
• Thermostat - Mechanical or Electric (mounted or loose)
• Thermostatic Expansion Valve (mounted or loose)
• Electronic Expansion Valve (mounted or loose)
• Safety Shut Off Valve (SSOV) in place Liquid Line Solenoid Available Loose for field installation.
• Insulated Drain Pan
• Painted Cabinet (White or Black)
• Stainless Steel Cabinet
• Coated Coil (Russproof, Heresite, Bronz-Glow, or Electrofin®)

¹ EcoNet Control Package includes: EEV, suction pressure transducer, suction entering air coil temp. thermistors, local on-board two-row backlit LCD display and push-button adjustments. (Controller replaces TXV, liquid line solenoid valve, room thermostat, defrost termination, fan delay, and time clock.)

EcoNet® Enabled Unit Coolers (Optional)

Developed in conjunction with Rheem Manufacturing, these units integrate Rheem's EcoNet technology for enhanced reliability and efficiency in walk-in coolers and freezers. Key benefits include:

• Energy savings through precise superheat and space temperature control, fan cycling, and optimized defrost cycles based on compressor runtime.
• Elimination of unnecessary defrosts.
• Maximized energy efficiency with reduced compressor runtime.
• Reduced fan speed to 50% during off-cycle for energy savings.
• Suitability for single and multiple evaporator installations.

The optional EcoNet Command Center provides an intuitive graphical interface for controlling up to 32 devices, offering continuous communication between system components. The remote mount display allows for programming, monitoring, and troubleshooting of EcoNet Enabled Unit Coolers remotely.

Model Nomenclature

The model nomenclature follows a configurable base model structure:

¹ Refrigerant and electrical connection locations differ for Next-Gen All-Temp designs. Standard connections "L" are opposite to legacy All-Temp models. Mirror connections "U" are the same as legacy All-Temp models and available only as built-to-order base units without installed options.

² EcoNet approved refrigerants: R454A, R454C, R455A.

³ EcoNet Control Package includes: EEV, suction pressure transducer, suction, entering air coil temp. thermistors; local on-board two-row LCD display and push-button adjustments. (Controller replaces TXV, room thermostat, defrost termination and fan delay, and time clock.)

Application Rating & Electrical Data

Air Defrost Models // 6 FPI

* Each asterisk represents a variable character based on voltage ordered. See page 4 for nomenclature.

Dual Speed EC Motors include thermal overload protection.

Electric Defrost Models // 6 FPI

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

Dual Speed EC Motors include thermal overload protection.

Econet not available in 208-230/3.

Note: 208-230 ratings include 2 amp for controls on Econet Enabled units.

Electric Defrost Models // 4 FPI

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

Dual Speed EC Motors include thermal overload protection.

Econet not available in 208-230/3.

Note: 208-230 ratings include 2 amp for controls on Econet Enabled units.

Capacity Correction for Electric Defrost Evaporators

Distributor Nozzle & Expansion Valve Selections

Air Defrost Models // 6 FPI

Air Defrost Models // 6 FPI (R454A)

The Distributor lines are 3/16" diameter and 14" long.

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

Expansion valve selections based on +25° Suction Temp and 8°F to 12°F evaporator TD. Contact factory for operating conditions outside this range.

SBFTE Expansion valves are compatible with R454A refrigerant. SBFVE Expansion valves are compatible with R454C and R455A refrigerants.

For other valves, follow manufacturer's selection guidelines.

Base models (with no factory-mounted components) include nozzles sized for 100°F liquid, shipped loose.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Air Defrost Models

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Electric Defrost Models // 6 FPI

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Electric Defrost Models // 4 FPI

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Electric Defrost Models // 6 FPI

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Electric Defrost Models // 4 FPI

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Loose Components Required for A2L Isolation Controls

Amin (Minimum Allowable Room Size) Values // Electric Defrost Models // 6 FPI

Solenoid Shut Off Valves (SSOV) operate as double duty isolation/liquid line solenoid valves and are required to ship loose and be installed in the field, outside the refrigerated space.

SSOV/CSOV (Check Shut Off Valves) Selection Criteria: Maximum 10 Foot Line Rise, 100 Foot Line Run, 1:1 Condensing Unit/Evaporator.

Contact applications for additional lengths or design considerations.

Amin values calculated using operating conditions included in UL 60335-2-89 101.DVU.1.2 and standard connection sizes (liquid and suction).

Amin values provided for 10 Ft, 20 Ft, 30 Ft, 40 Ft and 50 Ft line lengths.

Contact applications for additional lengths or design considerations.

Amin values intended to determine compliance with UL 2-89 and is NOT for charging calculations.

Specifications // Air Defrost Models

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

For dimensional distance between hanger slots, consult model's corresponding dimensional drawing. Hanger slots are 3/8" deep x 1" wide.

Drain connection is 1-1/4" NPT for all models.

For shipping dimensions and weights, see the Shipping information included with each dimensional drawing.

Specifications // Electric Defrost Models

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

For dimensional distance between hanger slots, consult model's corresponding dimensional drawing. Hanger slots are 3/8" deep x 1" wide.

Drain connection is 1-1/4" NPT for all models.

For shipping dimensions and weights, see the Shipping information included with each dimensional drawing.

Specifications // Electric Defrost Models // 4 FPI

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

For dimensional distance between hanger slots, consult model's corresponding dimensional drawing. Hanger slots are 3/8" deep x 1" wide.

Drain connection is 1-1/4" NPT for all models.

For shipping dimensions and weights, see the Shipping information included with each dimensional drawing.

Dimensional Drawings

Figure 1 - Single Fan

Front View:

Diagram showing a single fan unit with dimensions labeled:

• Overall width (A): 27 1/8 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Fan diameter: Approximately 12 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Figure 2 - Two Fan

Front View:

Diagram showing a two-fan unit with dimensions labeled:

• Overall width (A): 43 5/8 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Figure 3 - Three Fan

Front View:

Diagram showing a three-fan unit with dimensions labeled:

• Overall width (A): 60 1/8 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Figure 4 - Four Fan

Front View:

Diagram showing a four-fan unit with dimensions labeled:

• Overall width (A): 76 5/8 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Figure 5 - Five Fan

Front View:

Diagram showing a five-fan unit with dimensions labeled:

• Overall width (A): 93 1/4 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Figure 6 - Six Fan

Front View:

Diagram showing a six-fan unit with dimensions labeled:

• Overall width (A): 109 1/4 inches
• Height: 16 1/2 inches
• Depth: 15 1/2 inches
• Suction connection (back): 3/4-14 NPT DRAIN
• Knockouts: 7/8" (4 back, 6 top)

Side View:

Diagram showing the side profile of the unit with dimensions labeled.

Measurements noted on the end view drawing are the same for all units. All mounting holes are 3/8" diameter. All dimensions are in inches.

Evaporator Application Ratings

Coldzone's published application ratings are a guideline for proper equipment selection, accounting for true operating conditions. These ratings are higher than the net capacity used for DOE ratings (AWEF). The AWEF is calculated using dry coil capacity and daily evaporator power consumption, including fan and defrost power. DOE test conditions (10°F evaporator/SST, <50% RH, 96°F liquid temp) create a uniform test method but may result in oversized equipment if used for selection.

Cooler Models

* Each asterisk represents a variable character based on voltage ordered. See nomenclature on page 4 for details.

1. If the model has a numerical value in the table above, the following statement applies: "The refrigeration system is designed and certified for use in walk-in cooler applications."

Freezer Models

2. If the model has a numerical value in the table above, the following statement applies: "The refrigeration system is designed and certified for use in walk-in freezer applications."