Water Boilers
Ajax water boilers perform dependably and quietly, providing commercial, institutional, and industrial buildings with space heating, domestic and process hot water. Inclined tubes provide uniform heat transfer, resulting in high fuel economy and long boiler life. 2″ O.D. tubes (steel or copper) are rolled into large headers on both ends producing excellent boiler circulation. 2″ O.D. tubes are less restrictive than smaller O.D. tubes. Our non-proprietary tubes are less costly for tube replacement. Ajax’s straight tube design allows for easy inspection of tube conditions.
Water Tube Bundle Assembly
Constructed and Stamped to ASME Code Section IV (heating boilers), the water tube assembly is individually rolled into the headers and supported by a rugged steel frame with expansion joints at each corner. This allows the entire tube bundle to float freely as it expands and contracts preventing thermal shock damage. The elimination of air bubbles and the prevention of waterside corrosion is accomplished by sloping the tubes upward 1/2″ per linear foot from the rear to the front.
Atmospheric Burner Assembly
Multiple burner heads make up the burner assembly, each with its own venturi and orifice. The cast-iron burner head has long been recognized as the simplest, most trouble-free gas burner available.
Pre-Mix / Low NOx Burner Assembly
Ajax boilers use proprietary 12 and 20 ppm NOx burner assemblies that combine simple design and long-term reliable service. The low NOx is achieved by using a perforated burner plate, gas injector, and a low energy gas-air mixing sections in a clean manifold design.
Highlights: WRN & WRF
- Burner Design: Standardized across product lines
- Heat Exchanger: Increased surface area means greater efficiency
- Efficiency: 83% (atmospheric) / 84% – 85% (forced draft)
- Size: Lower height due to reduced size of combustion chamber
Pressure Drop Charts
Construction
WRF Model
WRN Model
1 – Large Headers on both ends
• Excellent boiler circulation
• Standard working pressure 125 psig
• 3/8″ – 1″ pressure vessel quality steel
• Removable front and rear head plates
• ASME Code construction
• Large water volume
2 – Full Capacity Relief Valve
3 – 2″ O.D. Inclined Steel Tubes
• Uniform heat transfer
• Inclined to eliminate air bubbles
• Excellent circulation
4 – Heavy Gauge Steel Jacket
• Galvanized steel for corrosion resistance on the inside as well as the outside
• Mirror finish stainless steel or painted jacket is available
5 – High Temperature Cast Refractory
• Interlocked modular panels ensure a tight leak-proof firebox
6 – Insulation
• 3″ layer felt insulation surrounds combustion chamber
• Minimum heat loss through jacket
7 – Factory Assembled Gas Train and Controls (not shown on FD)
• Reduced installation time
• All codes available
8 – Rugged Steel Frame
• Long boiler life
• Seismic design available
9 – Cast Iron Upshot Burners
• Quiet Ignition
• Years of trouble-free service
10 – Gas Pilot with Electric Ignition
• Low stand by losses
11 – Removable Firebox Door
• Full width access to combustion chamber
• Bolted on all atmospheric boilers – segmented on larger units
12 – Straight “See Through” Tubes
• Makes waterside easy to inspect
• Mechanical cleaning can be performed
• 2″ O.D. tubes readily available = lower replacement cost than proprietary bent tubes
• Rolled into deep headers for large water volume
13 – Hand Holes
• For waterside inspections
14 – Observation Port
• View flame and combustion chamber (forced draft units only)
15 – Front Door
• Full width access to combustion chamber
• Hinged on sizes up to 1750
• Bolted on sizes 2000 and up.
These sizes provided with side access door (not shown)
16 – Burner (not shown)
• Gas, No. 2 Oil or Combination Gas/Oil
• Boiler package UL Listed with a variety
of burner manufacturers.
17 – High Temperature Cast Refractory Floor
18 – Sturdy I-Beam Skid Base
19 – Lightweight Insulating Refractory
• Restricts heat loss
• Minimizes energy loss from jacket
Water Boiler Summary
