Lennox B Series - User Manual

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A I R H A N D L E R S

B SERIES

R-410A or R-22 - Multi-Position - 50HZ/60HZ (Export Only)

Bulletin No. 490137

September 2009

E N G I N E E R I N G D ATA

3.5 to 17.6 kW (1 to 5 Tons)

Optional Electric Heat - 2.5 to 25 kW

Optional Hot Water Heat -

2.6 to 36.3 kW (9,000 to 124,000 Btuh)

CABINET

Enhanced grommets - secure & tight.

Multi-position available from factory and eld

convertible.

Side return right- or left-hand capable on 12 to 30 and

36 size models.

All air handlers are basiloid packaged with bar coding

and full description on label.

Magnetic lter rack door makes for easy lter

replacement and a tight seal for less air leakage.

Fiberglass air lter comes with every air handler and

lter racks accepts readily available size lters.

Rigid beige painted cabinets constructed of heavy

gauge steel to prevent corrosion and are lined with high

quality

9.5 mm (5/8 in.) foil faced insulation to prevent

sweating.

EVAPORATOR COIL

Patented lanced n design and internally enhanced

copper tubing.

Suitable for use with R-22 and R-410A.

Dual 19 mm (3/4 in.) FPT left and right condensate

drain connections.

Drain pans are molded of corrosion proof high

temperature engineering polymer.

Coils are air pressure tested at 72 kPa (500 PSI),

pressure tested with Helium, sealed and then charged

with dry air.

Florator, non-bleed A/C or HP TXV’s available factory

installed. Screw-on TXV’s also available for eld

installation.

HOT WATER HEAT

Suitable for potable water systems.

Hot Water Heat Kits available both factory and eld

installed.

Easy to replace hot water coil. Remove one screw and

slide out.

Optional factory installed circulating pump fully encased

in cabinet.

Purge valve on hot water coil allows for manual release

of any air trapped in coil during installation or servicing.

Water connections 7/8 in. ODF (for 3/4 in. water pipe)

on 12 to 30, and 36 size models and 1-1/8 in. ODF (for

1 in. water pipe) on 31, and 37 - 60 size models.

Control board comes standard factory installed on all

Air Handlers and includes the following features:

Features are compatible with both factory and eld

installed circulating pumps.

1. Pump timer activates pump for 1 minute every 6

hours eliminating stagnant water in hot water coil.

2. 24 VAC isolation valve control-allows for zoning

control.

3. Auxiliary contacts for water heater or boiler

activation.

4. Freeze protection- standard factory installed,

activates at 4°C (40°F) and deactivates at 21°C (70°F).

5. Thermostat connections.

6. Time delay for blower activation:

• 60 seconds (tap in OFF position)

• 54°C (130°F) Aquastat (tap in ON position)

Note: Aquastat tap only included if ordered

FEATURES

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This document describes the Lennox R-410A or R-22 Multi-Position - 50HZ/60HZ (Export Only) Air Handlers, B Series, with a bulletin date of September 2009. These air handlers are designed for various applications and offer a range of features for efficient operation and maintenance.

Function Description:

The Lennox B Series Air Handlers are designed to provide heating and cooling for residential and commercial spaces. They are multi-position units, meaning they can be installed in different orientations (upflow, horizontal right, horizontal left) to suit various building layouts. The units are compatible with either R-410A or R-22 refrigerants, offering flexibility for different system requirements. They feature a variable-speed blower motor for optimized airflow and enhanced comfort, and can be configured with electric heat or hot water coils for heating.

Important Technical Specifications:

General Data:

Nominal kW (tons): Available in sizes from 3.5 (1) to 17.6 (5) kW (tons).
Connections:
- Suction line (o.d.) - mm (in.) sweat: 19 (3/4) to 26 (7/8)
- Liquid line (o.d.) - mm (in.) sweat: 9.5 (3/8)
- Condensate - in. fpt: (2) 3/4
- Circulating pump connection size - in.: 7/8
Florator Piston Size:
- R-22: 0.041 to 0.093
- R-410A: 0.041 to 0.093
Three Speed Blower:
- Wheel nominal diameter x width - mm (in.): 229 x 152 (9 x 6) to 254 x 203 (10 x 8)
- Blower motor output - W (hp): 149 (1/5) to 945 (2000)
- Nominal air volume - L/s (cfm): 190 (400) to 945 (2000)
Variable Speed Blower:
- Wheel nominal diameter x width - mm (in.): 229 x 152 (9 x 6) to 254 x 203 (10 x 8)
- Blower motor output - W (hp): 224 (1/3) to 746 (1)
- Cooling range - L/s (cfm): 285 - 565 (600 - 1200) to 800 - 895 (1700 - 1900)
- Heating range L/s (cfm): 285 - 565 (600 - 1200) to 800 - 895 (1700 - 1900)
Filters:
- Size of filter - mm (in.): 305 x 508 (12 x 20) to 406 x 635 (16 x 25)
Shipping Data:
- -1 package - kg (lbs.) less hot water coil: 54 (120) to 109 (240)

Electrical Data:

Available Voltage (three speed): 120V or 208/240V, 60Hz, 1 ph or 220V, 50Hz, 1 ph
- Full load amps at 120V: 1.4 to 10.5
- Full load amps at 240V: 1.4 to 4.3
Available Voltage (variable speed): 120V or 208/240V, 60Hz, 1 ph
- Full load amps at 120V: 6.0 to 10.2
- Full load amps at 240V: 3.0 to 5.1
Transformer size and type: 40VA, Class 2
Voltage (hot water circulating pump): 120V or 208/240V
- Amps: 0.52

Cabinet Features:

Enhanced grommets: Secure and tight.
Multi-position available: From factory and field convertible.
Side return right- or left-hand capable: On 12 to 30 and 36 size models.
All air handlers are baseloid packaged: With bar coding and full description on label.
Magnetic filter rack door: Makes for easy filter replacement and a tight seal for less air leakage.
Fiberglass air filters: Come with every air handler and filter racks accept readily available coil filters.
Rigid beige painted cabinets: Constructed of heavy gauge steel to prevent corrosion and are lined with high quality insulation.
9.5 mm (5/8 in.) foil faced insulation: To prevent sweating.

Evaporator Coil Features:

Patented lanced fin design: And internally enhanced copper tubing.
Suitable for use: With R-22 and R-410A.
Dual 19 mm (3/4 in.) FPT left and right condensate drain connections.
Drain pans: Are molded of corrosion proof high temperature engineering polymer.
Coils: Are air pressure tested at 72 kPa (500 PSI), pressure purged with Helium, sealed and then charged with dry air.
Florator non-bleed A/C or HP TXV's: Available factory installed. Screw-on TXV's also available for field installation.

Hot Water Heat Features:

Suitable for potable water systems.
Hot Water Heat Kits: Available both factory and field installed.
Easy to replace hot water coil: Remove one screw and slide out.
Optional factory installed circulating pump: Fully encased in cabinet.
Purge valve: On hot water coil allows for manual release of any air trapped in coil during installation or servicing.
Water connections: 7/8 in. ODF (for 3/4 in. water pipe) on 12 to 30, and 36 size models and 1-1/8 in. ODF (for 1 in. water pipe) on 31, and 37 - 60 size models.
Control board: Comes standard factory installed on all Air Handlers and includes the following features:
- Pump timer activates pump for 1 minute every 6 hours eliminating stagnant water in hot water coil.
- 24 VAC isolation valve control-allows for zoning control.
- Auxiliary contacts for water heater or boiler activation.
- Freeze protection- standard factory installed, activates at 4°C (40°F) and deactivates at 21°C (70°F).
- Thermostat connections.
- Time delay for blower activation:
  - 60 seconds (tap in OFF position)
  - 54°C (130°F) Aquastat (tap in ON position)

Usage Features:

Variable-Speed Motor:

Variable-speed control board: Includes dry contacts for thermostat connections.
Constant air circulation feature: Runs airflow at 50% of cooling airflow, improves indoor air quality and eliminates stratification.
Control Board (LED): Lights display operation mode and when dehumidification is activated.
Dehumidification: Cutting dehumidification resistor on variable-speed control board reduces cooling airflow by 10%.
Customizable cooling/heating airflow settings: By selecting taps A-D on the variable-speed control board.
Fine tune your airflow setting: By selecting (+) tap to increase airflow by 10% and (-) tap to decrease airflow by 12%.
Soft start feature: Runs airflow at 82% of cooling airflow for first 7.5 minutes of operation.
Time Delay: 1.5 minute blower off delay at the end of a call for cooling.

Electrical Features:

Blower door safety switch: On all models.
Dynamically balanced high efficiency three-speed motors: For project flexibility.
Easy to adjust blower speeds: For fine tuning customer comfort.
Electrical connections: Can be made on top or both sides of cabinet.
Electric heat kits: Available factory installed for 2.5 & 5 kW. Higher kW heat kits available for field installation.
Factory installed fan time delay: Postpones blower shutoff 30 seconds in heating mode and 45 seconds in cooling mode.

Maintenance Features:

Magnetic filter rack door: Allows for easy and quick filter replacement.
Purge valve: On hot water coil facilitates manual release of trapped air during installation or servicing.
Easy to replace hot water coil: Requires only one screw to slide out.
Coils are air pressure tested, purged with Helium, and sealed: Ensuring reliability and reducing the need for early maintenance.
Control board includes a "test" tap: To run the motor at 70% of full airflow for troubleshooting.
Dehumidify resistor: Located on the bottom right of the control board, must be removed if a humidistat is used.