Dunham Bush ACPSH – Falcon Rooftop Units High Ambient Air Cooled Rooftop Packaged Units

Cooling Capacity from 70 to 619 MBH (20 to 182 kW)

The ACPSH features:

• Quiet & High Efficiency Scroll Compressors
• Rigid and Custom Build Design for Outdoor Application
• Operate Up to 125°F (52°C) Ambient Air Temperature
• Optional Economizer Section, Heat-Pump & Heaters
• Green Refrigerants

The Dunham Bush Falcon ACPSH Series addresses the toughest challenge in modern air-cooled HVAC design: sustained thermal performance during brutal summer heat waves. Standard air-cooled rooftop units are usually rated for mid-tier temperate zones; when outdoor rooftop temperatures in industrial areas like Gazipur, Narayanganj, or Chittagong exceed 40°C, standard machines suffer from soaring head pressures, high power consumption, and frequent safety trips. The ACPSH series is explicitly engineered from the ground up to thrive under direct sunlight and high thermal loads, keeping interior spaces consistently cool even when the roof surface approaches 52°C.

This exceptional high-temperature resilience is built around specially tropicalized, high-efficiency scroll compressors. These hermetic powerhouses utilize an upgraded internal motor insulation system and heavy-duty scroll profiles capable of managing high discharge pressures without overheating. By combining multiple compressors across independent refrigerant circuits, the system handles partial-load demands efficiently, ramping power consumption down smoothly when the outside temperature cools in the evening.

The airside component utilizes an expansive V-coil condenser layout with built-in sub-cooling circuits. This oversized heat rejection surface area ensures rapid thermal dissipation even when surrounded by stagnant, hot air. The entire system is housed in a heavy-gauge, galvanized steel enclosure treated with a zinc-phosphate base and finished with a baked epoxy powder coating, offering top-tier protection against heavy monsoon rains, corrosive industrial emissions, and high humidity levels.

Key Technical Highlight Matrix

Core Functions of the Dunham Bush Falcon ACPSH Series

• Continuous High-Ambient Cooling Acceleration: Keeps internal pressure ratios balanced through an oversized condenser matrix, ensuring the unit delivers its full rated cooling capacity even during peak summer heat waves.

• All-In-One Packaged Ventilation: Combines the entire refrigeration cycle—compressor, condenser, evaporator, and heavy-duty centrifugal blower—inside a single outdoor footprint, completely eliminating the need for interior mechanical rooms.

• High-Static Ducted Air Delivery: Utilizes powerful, belt-driven centrifugal fans that allow engineers to adjust pulley ratios on site. This ensures uniform airflow distribution through long, complex indoor duct networks.

• Advanced Microprocessor Safety Shielding: Continuously tracks suction/discharge pressures, electrical phase stability, and compressor thermal thresholds, applying auto-corrective adjustments before a grid anomaly can cause damage.

Strategic Importance Across Bangladesh

1. Government Institutes, Public Infrastructure & Strategic Facilities

State installations—including high-density public data centers, national research laboratories, defense communication complexes, and emergency healthcare backup hubs—demand non-stop climate control that cannot fail during extreme heat waves.

• Guaranteed Uptime During Heat Domes: The 52°C ambient rating ensures critical public servers and medical cold chains remain perfectly cool, even when the local electrical grid faces high-temperature strain.

• Preserves Clean Architectural Lines: By sitting entirely on the roof or an outdoor ground pad, the ACPSH avoids cluttered exterior walls, preserving the building's aesthetic profile while keeping maintenance access safely outdoors.

2. Private Sector Manufacturing, RMG Industrial Complexes & Warehouses

For Bangladesh’s export-driven Ready-Made Garment (RMG) factories, textile printing facilities, food processing plants, and pharmaceutical storage warehouses, maintaining a stable temperature is essential for product quality and worker safety.

• Combines High Internal Heat & Rooftop Sun Loads: Factory roofs generate intense heat from both direct sunlight and internal machinery. The ACPSH handles these dual thermal loads easily, keeping worker production lines comfortable and maintaining steady output.

• Protection Against Production Interruption: Thanks to its multi-compressor layout, if one cooling circuit requires a routine filter or expansion valve check, the remaining circuits keep running, keeping your business online.

Why Buy From Bhai Bhai Engineering?

Sourcing an authentic, high-ambient rooftop packaged system requires an experienced engineering partner. Bhai Bhai Engineering delivers professional industrial HVAC services across Bangladesh:

• Verified Authentic OEM Imports: We partner directly with global Dunham Bush production facilities, ensuring your project receives 100% genuine, brand-new equipment complete with verified factory certificates and clear serial numbers.

• Turnkey Engineering & Duct Fabrication: Our experienced in-house technical team designs, fabricates, and balances your complete air delivery system, ensuring correct static pressures and zero air leaks.

• Transparent Local BDT Pricing: Avoid unexpected financial surprises from shifting import duties or logistics. We offer transparent commercial quotes in Bangladeshi Taka (BDT) structured for corporate boards or government procurement profiles.

• Long-Term Local Parts & Service Support: We maintain local stocks of high-ambient scroll components, original microprocessor modules, contactors, and fan belts to protect your operations from costly downtime.

Contact Us for a Quotation

Protect your next commercial or industrial development against extreme tropical heat waves. Contact our project sales engineering desk in Dhaka today to receive a detailed commercial proposal and technical data sheets tailored to your facility's specific load requirements.

• Corporate Headquarters: Podirdia, Khilbarirtek, Vatera, Dhaka-1212. (Nur-E-Madina Mosjid Complex)

• Sales & Project WhatsApp: +8801722039029

• Corporate Mailbox: bhaibhaiengineering51@gmail.com

• Engineering Portal: https://www.bhaibhaiengineering.com/

Frequently Asked Questions (FAQs)

Q1: What exactly makes the ACPSH "High Ambient" compared to standard standard rooftop units?

Ans: Standard units often suffer from high discharge pressure faults and shut down when outdoor temperatures exceed 40°C to 43°C. The ACPSH features oversized condenser coils, high-torque Class F insulated fan motors, and tropicalized scroll compressors designed to run continuously at temperatures up to 52°C (125°F) without tripping.

Q2: Does this rooftop unit require an indoor plant room or water piping?

Ans: No. The Dunham Bush ACPSH is a completely self-contained, air-cooled packaged system. It contains the entire refrigeration loop and air handler inside its outdoor casing, completely eliminating the need for indoor chiller spaces, water pumps, cooling towers, or complex hydronic piping.

Q3: Can the ACPSH handle coastal salt air or corrosive factory environments?

Ans: Yes. The outer casing is built from heavy-gauge galvanized steel panels coated with a weather-resistant baked epoxy powder finish. For installations near coastal salt-air regions or heavy chemical zones, Bhai Bhai Engineering can supply optional anti-corrosion coil coatings to maximize service life.

Q4: How does the multi-compressor system help save on monthly electricity bills?

Ans: Instead of running a single large compressor that draws high starting current, models with multiple compressors use progressive step staging. When your building’s thermal load drops (such as during night shifts or cooler months), the microprocessor powers down unneeded compressors, keeping your energy consumption low.