High Efficiency Commercial Pool Package Systems
Lochinvar AQUAS Series
The AQUAS commercial pool package represents a significant advancement in pool heating system design. It is a factory-assembled system featuring a free-standing boiler integrated with a dedicated cupro-nickel pool heat exchanger.
Innovation in Design
Key Benefits of the AQUAS Indirect Pool Heating Design
- Effective heat transfer from a high-efficiency, modulating, condensing boiler.
- Complete factory-assembled package reduces installation cost and time.
- Separation of pool water from the direct-fired heat source reduces maintenance and promotes longer equipment life.
- Reliability and performance with a positive user experience.
Pool Heat Exchanger
A durable industrial-grade cupro-nickel heat exchanger provides effective heat transfer. Pool water flows through cupro-nickel tubes surrounded by heated boiler water, ensuring efficient heat transfer while keeping the pool water separate from the heat source.
Optional Titanium Pool Heat Exchanger
Lochinvar offers an optional titanium pool heat exchanger, a strong, lightweight alloy highly resistant to corrosion from salt water and chlorine, making it ideal for pool systems.
Inside the Boiler
The AQUAS system utilizes advanced, high-efficiency condensing boilers perfectly suited for the low water temperatures typical of pool heating. Key boiler features include:
Fully Modulating Burner
The modulating burner adjusts the input rate to precisely match the pool water's Btu/hr losses. This allows the boiler to operate at lower input rates for longer periods, significantly increasing overall boiler life compared to on/off cycling.
Thermal Efficiency
Constructed with stainless steel modulating condensing boilers, the AQUAS delivers up to 98% thermal efficiency. The system is ideal for low return water temperatures from pools, and the heat exchanger is sized for maximum heat transfer, reducing fuel costs.
Direct Vent with PVC
Installation costs and effort are reduced by using PVC pipe for venting. The AQUAS supports various vent materials (PVC, CPVC, Polypropylene, Stainless Steel) and offers direct venting. By drawing combustion air through a dedicated intake pipe, the system is protected from corrosive pool chemicals.
Refined Design Puts More Control and Information at your Fingertips
Advanced Features Include:
- Multi-Color Graphic LCD Display
- Navigation Dial
- Cascading capability for up to 8 AQUAS Packages for lead-lag efficiency optimization and mixing of input sizes.
- USB Port for PC Connection
- Maintenance Reminder with Installer Name & Number
- Modbus Communication (Optional)
- Password Security
- Operational and Alarm Readouts
At-a-Glance Color Coding
Blue Screen: Indicates normal system operation.
Yellow Screen: Signals that maintenance is due, displaying the installer's name and number.
Red Screen: Indicates a lockout mode.
System Components and Layout
The system is typically skid-mounted on a steel frame for stability and ease of installation. Key components include:
- Expansion Tank with Fill Valve
- Air Inlet Connection
- Relief Valve (ASME Pressure Relief Valve)
- Copper Pipe
- System Sensor Location
- Cupro-Nickel Pool Heat Exchanger with CPVC Connections (Titanium is optional)
- Flow Switch
- T&P Gauge (Temperature & Pressure Gauge)
- Boiler Pump
- Vent Connection
Note: The indoor model is shown in diagrams. Outdoor Rated Models (OXN402-802) are sealed and jacketed for protection against the elements, featuring pump covers, air intake covers, and a specialized vent assembly for outdoor installation. Outdoor models use Lochinvar's water tube design heat exchanger.
Model Specifications
The AQUAS series is available in various models, including indoor (APN) and outdoor (OXN) configurations, with different input capacities and turndown ratios. The following table details key specifications:
| Model | Input Btu/hr | Turn Down Ratio | A | B | C | D | E | EE | Pool Gas Conn. | Vent Conn. | Air Inlet | Pool Flow (GPM) | Ship Wt. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| APN285 | 285,000 | 10:1 | 46-1/2" | 15-3/4" | 34" | 28-1/2" | 6-3/4" | 49" | 2-1/2" | 1" | 3" | 68 | 390 |
| APN400 | 399,999 | 10:1 | 55-1/2" | 15-3/4" | 43-1/4" | 7-3/4" | 49" | 43-1/4" | 3" | 1" | 4" | 96 | 622 |
| APN500 | 500,000 | 10:1 | 55-1/2" | 15-3/4" | 43-1/4" | 7-3/4" | 49" | 43-1/4" | 3" | 1" | 4" | 120 | 647 |
| APN600 | 600,000 | 7:1 | 55-1/2" | 15-3/4" | 43-1/4" | 7-3/4" | 49" | 44" | 4" | 1" | 6" | 144 | 664 |
| APN725 | 725,000 | 7:1 | 56" | 15-3/4" | 43-1/4" | 7-3/4" | 49" | 44" | 4" | 1" | 6" | 174 | 774 |
| APN850 | 850,000 | 7:1 | 56" | 15-3/4" | 43-1/4" | 7-3/4" | 49" | 44" | 4" | 1" | 6" | 204 | 801 |
| OXN402 | 400,000 | 5:1 | 45-3/4" | 15-3/4" | 53" | 43-1/4" | 7-3/4" | 49" | 2-1/2" or 3" | 1" | 4" | 93 | 465 |
| OXN502 | 500,000 | 5:1 | 45-3/4" | 15-3/4" | 57-1/2" | 43-1/4" | 7-3/4" | 49" | 2-1/2" or 3" | 1" | 4" | 117 | 497 |
| OXN602 | 600,000 | 5:1 | 46" | 15-3/4" | 69" | 43-1/4" | 7-3/4" | 49" | 3" | 1" | 4" | 142 | 534 |
| OXN702 | 700,000 | 5:1 | 46" | 15-3/4" | 74" | 44" | 7-3/4" | 49" | 3" or 4" | 1" | 6" | 166 | 634 |
| OXN802 | 800,000 | 5:1 | 46" | 15-3/4" | 79" | 44" | 7-3/4" | 49" | 3" or 4" | 1" | 6" | 202 | 671 |
Notes: Change 'N' to 'L' for LP gas models. No deration on LP models. Performance data is based on manufacturer test results. Agency certification applies to the boiler.
Standard Features
- Up to 98% Thermal Efficiency
- Modulating Burner with up to 10:1 turndown
- Direct-Spark Ignition
- Low NOx Operation
- Sealed Combustion
- Low Gas Pressure Operation
- Vertical & Horizontal Venting: Category IV Venting up to 100 Feet using PVC, CPVC, Polypropylene or AL29-4C Vent Material. Sidewall Vent Terminations Provided (Except 285).
- ASME Stainless Steel Boiler Heat Exchanger: ASME Certified, "H" Stamped, Gasketless Design, 160 PSI Working Pressure.
- On/Off Switch
- Expansion Tank w/ Fill Valve
- Adjustable High Limit w/ Auto Reset
- Adjustable High Limit w/ Manual Reset
- Flow Switch
- Low Air Pressure Switches
- Inlet & Outlet Temperature Sensors
- Two Easy Access Terminal Strips
- Temperature & Pressure Gauge
- Zero Clearances to Combustible Material
- ASME Pressure Relief Valve
- Standard Cupro-Nickel Pool Heat Exchanger: Salt Water Ready, Flanged CPVC Connections.
- Warranties: 10 Yr Boiler, 1 Yr Parts, 3 Yr Pool Heat Exchanger (See Warranty for Details).
Smart SystemTM Features
- SMART SYSTEMTM Operating Control: Multi-Colored Graphic LCD Display with Navigation Dial.
- Built-in Cascading Sequencer: Supports up to 8 Pool Heaters for Lead-Lag Efficiency Optimization and mixing of input sizes.
- Outdoor Reset Control with Outdoor Air Sensor.
- Building Management System Integration: Optional Modbus communication, 0-10 VDC Input Control for Modulation or SetPoint, 0-10 VDC Output for Modulation Rate.
Optional Equipment
- CON•X•US Remote Connect
- Titanium Pool Heat Exchanger, 5 Yr Warranty
- Alarm Bell
- Condensate Neutralization Kit
- High & Low Gas Pressure Switches with Manual Reset
- Room Air Kit
- Secondary Heat Exchangers
- BMS Gateways for LON or BACnet
Firing Codes and Ordering
The AQUAS systems are available with different firing codes to meet specific regulations and safety standards:
- M9: Standard Construction
- M7: California Code
- M13: CSD1 / Factory Mutual / GE Gap (for models 500-850 Btu/hr)
Example Ordering: To order a 500,000 Btu/hr natural gas pool heater with M9 firing controls, the model number would be APN-500-M9.
