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Airstream™ Hydronic Cassette Ceiling Fan Coils
42WKN

200 to 1,200 Cfm

Hydronic cassette units are ideal for retrofit applications and modernizations with suspended ceilings. Ceiling cassette units make each served area an independent controlled temperature zone to suit diverse requirements.

Performance Features
  • Fans are statically and dynamically balanced for quiet operation
  • 6 chilled water cooling models to properly match job requirements
  • Independent Louvers (2-3-4 Flow Directions Distributions)
Reliability Features
  • All equipment wiring complies with NEC requirements
  • Base units are UL certified for USA and Canada standards
  • Unit casing meets NFPA 90A requirements for flame and smoke generation
Maintenance Features
  • Integrated Condensate Pump
  • Built-in Overflow Safety Devices
  • Reusable wire framed filters may be vacuum cleaned
  • Alarm interlock relay for unit failure notification
Installation Features
  • Branch Ducting Capability
  • Fresh/Outside Air Intake
Standard Warranty
  • 1 year parts
Factory-Installed Options
  • Electromechanical unit controls for use with a 24V wall mounted thermostat
  • Programmable microprocessor controls
  • Electric heating coil
  • Hot water heating coil
  • Hot water coil freeze protection
  • Disconnect switch (non-fused)
Field-Installed Accessories
  • Two Position Motorized Valve Accessory package
  • 2 or 3-Way Two-Position Control Valves with shut-off valves
  • Pre-Assembled piping with Fittings for Fast and Easy Installation
  • Wall Mounted Mechanical or Digital Thermostat
  • Aquastat for 2-pipe changeover systems
  • Duct collars for fresh air Intake or branch ducting
  • Spare filters
  • Shroud to cover unit housing for exposed mounting
42WKN Unit Size 08 12 18 20 33 36
Nominal Tons 3/4 1 1-1/2 1-3/4 2-1/2 3
Cooling Capacity (Btuh) 6601 11091 17592 19087 29722 35258
Dimensions/Weights
Height - Chassis/Fascia (in.)
(not additive)
11-3/4 / 1-1/4 11-3/4 / 1-1/4 11 / 1-3/4 11 / 1-3/4 13 / 1-3/4 13 / 1-3/4
Width - Chassis/Fascia (in.) 22-1/2 / 25 22-1/2 / 25 32-3/8 / 37 32-3/8 / 37 45-1/2 / 49-1/4 45-1/2 / 49-1/4
Depth - Chassis/Fascia (in.) 22-1/2 / 25 22-1/2 / 25 32-3/8 / 37 32-3/8 / 37 32-3/8 / 37 32-3/8 / 37
Weight - Chassis/Fascia (lb.) 40 / 5 40 / 5 64 / 18 64 / 18 97 / 21 97 / 21
Chilled Water Coil
Type Finned Tube
Quantity 1 1 1 1 1 1
Face Area (sq ft) 1.8 1.8 2.8 2.8 5.2 5.2
Nominal Airflow (cfm)
High 350 350 630 700 970 1160
Medium 300 300 530 630 890 970
Low 260 260 500 530 785 890
Discharge 4-way 4-way 4-way 4-way 4-way 4-way
Unit Water Volume (gal) .29 .29 .45 .45 .79 .79
Fan
Type Centrifugal
Quantity 1 1 1 1 2 2
Diameter (in.) 12 12 5 15 14 14
Horsepower per fan (Hp) 1/8 1/8 1/8 1/8 1/8 1/8
Connections (Sweat)
Chilled Water Inlet, OD (in) 5/8 5/8 7/8 7/8 7/8 7/8
Chilled Water Outlet, OD (in) 5/8 5/8 7/8 7/8 7/8 7/8
Condensate, ID (in) 3/8 3/8 3/8 3/8 3/8 3/8
Filtration
Type Cleanable Wire Framed
Quantity 1 1 2 2 3 3
Arrestance 80% 80% 80% 80% 80% 80%
Condensate Pump
Maximum Head (in) 30 30 30 30 30 30
Nominal Flow Rate (gpm) 0.1 0.1 0.1 0.1 0.1 0.1
Heating Option
Electric Heating Capacity (kW) 1.5 4.5 3.0 3.0 5.0 5.0
Hot Water Heating Capacity (Btuh) 13799 N/A 29258 30946 46455 51600
Hot Water Coil Connection, OD (in) (Sweat) 5/8 N/A 5/8 5/8 5/8 5/8
Branch Duct Option
Branch Duct Connections (qty) 2 2 2 2 2 2
Branch Duct Diameter (in) 5 5 5 5 5 5
Ducted Air Volume (cfm) 80 80 100 125 200 220
Fresh Air Option
Fresh Air Connections (qty) 1-2 1-2 1-3 1-3 1-3 2-3
Fresh Air Duct Diameter (in) 3 3 3 3 3 3
Fresh Air Volume (cfm) 40 40 60 62 90 95

ID = Inside Diameter

OD = Outside Diameter

Notes
1. Cooling capacity based on 80°F dry bulb/67°F wet bulb indoor and a 45°F entering/55°F leaving chilled water temperature.
2. Heating capacity based on water temperature of 180°F inlet/160°F outlet and an air temperature of 70°F dry bulb.
3. Ducted air volume based on maximum air volume available through one branch duct 6ft. long, with cassette fan(s) at high speed and corresponding fascia aperture closed.
4. Fresh air volume based on maximum fresh air through all knockouts connected one 10ft. long duct with fan at high speed.

Performance Features
  • Fans are statically and dynamically balanced for quiet operation
  • 6 chilled water cooling models to properly match job requirements
  • Independent Louvers (2-3-4 Flow Directions Distributions)
Reliability Features
  • All equipment wiring complies with NEC requirements
  • Base units are UL certified for USA and Canada standards
  • Unit casing meets NFPA 90A requirements for flame and smoke generation
Maintenance Features
  • Integrated Condensate Pump
  • Built-in Overflow Safety Devices
  • Reusable wire framed filters may be vacuum cleaned
  • Alarm interlock relay for unit failure notification
Installation Features
  • Branch Ducting Capability
  • Fresh/Outside Air Intake
Standard Warranty
  • 1 year parts
Factory-Installed Options
  • Electromechanical unit controls for use with a 24V wall mounted thermostat
  • Programmable microprocessor controls
  • Electric heating coil
  • Hot water heating coil
  • Hot water coil freeze protection
  • Disconnect switch (non-fused)
Field-Installed Accessories
  • Two Position Motorized Valve Accessory package
  • 2 or 3-Way Two-Position Control Valves with shut-off valves
  • Pre-Assembled piping with Fittings for Fast and Easy Installation
  • Wall Mounted Mechanical or Digital Thermostat
  • Aquastat for 2-pipe changeover systems
  • Duct collars for fresh air Intake or branch ducting
  • Spare filters
  • Shroud to cover unit housing for exposed mounting
42WKN Unit Size 08 12 18 20 33 36
Nominal Tons 3/4 1 1-1/2 1-3/4 2-1/2 3
Cooling Capacity (Btuh) 6601 11091 17592 19087 29722 35258
Dimensions/Weights
Height - Chassis/Fascia (in.)
(not additive)
11-3/4 / 1-1/4 11-3/4 / 1-1/4 11 / 1-3/4 11 / 1-3/4 13 / 1-3/4 13 / 1-3/4
Width - Chassis/Fascia (in.) 22-1/2 / 25 22-1/2 / 25 32-3/8 / 37 32-3/8 / 37 45-1/2 / 49-1/4 45-1/2 / 49-1/4
Depth - Chassis/Fascia (in.) 22-1/2 / 25 22-1/2 / 25 32-3/8 / 37 32-3/8 / 37 32-3/8 / 37 32-3/8 / 37
Weight - Chassis/Fascia (lb.) 40 / 5 40 / 5 64 / 18 64 / 18 97 / 21 97 / 21
Chilled Water Coil
Type Finned Tube
Quantity 1 1 1 1 1 1
Face Area (sq ft) 1.8 1.8 2.8 2.8 5.2 5.2
Nominal Airflow (cfm)
High 350 350 630 700 970 1160
Medium 300 300 530 630 890 970
Low 260 260 500 530 785 890
Discharge 4-way 4-way 4-way 4-way 4-way 4-way
Unit Water Volume (gal) .29 .29 .45 .45 .79 .79
Fan
Type Centrifugal
Quantity 1 1 1 1 2 2
Diameter (in.) 12 12 5 15 14 14
Horsepower per fan (Hp) 1/8 1/8 1/8 1/8 1/8 1/8
Connections (Sweat)
Chilled Water Inlet, OD (in) 5/8 5/8 7/8 7/8 7/8 7/8
Chilled Water Outlet, OD (in) 5/8 5/8 7/8 7/8 7/8 7/8
Condensate, ID (in) 3/8 3/8 3/8 3/8 3/8 3/8
Filtration
Type Cleanable Wire Framed
Quantity 1 1 2 2 3 3
Arrestance 80% 80% 80% 80% 80% 80%
Condensate Pump
Maximum Head (in) 30 30 30 30 30 30
Nominal Flow Rate (gpm) 0.1 0.1 0.1 0.1 0.1 0.1
Heating Option
Electric Heating Capacity (kW) 1.5 4.5 3.0 3.0 5.0 5.0
Hot Water Heating Capacity (Btuh) 13799 N/A 29258 30946 46455 51600
Hot Water Coil Connection, OD (in) (Sweat) 5/8 N/A 5/8 5/8 5/8 5/8
Branch Duct Option
Branch Duct Connections (qty) 2 2 2 2 2 2
Branch Duct Diameter (in) 5 5 5 5 5 5
Ducted Air Volume (cfm) 80 80 100 125 200 220
Fresh Air Option
Fresh Air Connections (qty) 1-2 1-2 1-3 1-3 1-3 2-3
Fresh Air Duct Diameter (in) 3 3 3 3 3 3
Fresh Air Volume (cfm) 40 40 60 62 90 95

ID = Inside Diameter

OD = Outside Diameter

Notes
1. Cooling capacity based on 80°F dry bulb/67°F wet bulb indoor and a 45°F entering/55°F leaving chilled water temperature.
2. Heating capacity based on water temperature of 180°F inlet/160°F outlet and an air temperature of 70°F dry bulb.
3. Ducted air volume based on maximum air volume available through one branch duct 6ft. long, with cassette fan(s) at high speed and corresponding fascia aperture closed.
4. Fresh air volume based on maximum fresh air through all knockouts connected one 10ft. long duct with fan at high speed.

California residents please see Proposition 65