Broan B6LC Manual

Light Commercial
Heat Recovery Ventilators and
Energy Recovery Ventilators
Installation, Operation and Service Instructions
INSTALLER: READ THESE INSTRUCTIONS AND
LEAVE THIS MANUAL TO THE END USER.
VB0002
VB0001
22638 rev. F
B6LC
B12LC

2
Table of Contents
1. Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
2.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.2 Mounting Location Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.3 Mounting Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.4 Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
2.5 Internal Grilles and diffusers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.6 Exterior Hoods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.7 Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.8 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.2 Sequence of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.3 Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.4 Remote Wall Control (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4. Airow Measurements and Balancing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
5.1 Bi-Monthly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.2 Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
6. Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
6.1 Parts Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
6.2 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
7. Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
7.1 B6LC-B12LC Exhaust Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
7.2 B6LC-B12LC Recirculation Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Appendix A - Mounting Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Appendix B - Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16
Appendix C - Balancing Dampers Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Appendix D - Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Appendix E - Terminal Control Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
Appendix F - Control Box Assembly B6LC and B12LC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Appendix G - Make-up Heat Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Appendix H - Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-24

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Please take note that this manual uses the following symbols to emphasize particular information:
Identies an instruction which, if not followed, might cause serious personal injuries including possibility of death.
CAUTION
Denotes an instruction which, if not followed, may severely damage the unit and/or its components.
NOTE: Indicates supplementary information needed to fully complete an instruction.
LIMITATION
NOT FOR OUTDOOR USE. Installation work and electrical wiring must be done by a qualied person in accordance with all applicable
codes and standards, including re-rated construction codes and standards.
⚠WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSON(S) OBSERVE THE FOLLOWING:
1. Use this unit only in the manner intended by the manufacturer.
2. Before servicing or cleaning this unit, turn power off at service panel.
3. This unit is not designed to provide combustion and/or dilution air for fuel-burning appliances.
4. When cutting or drilling into a wall or ceiling, do not damage electrical wiring and other hidden utilities.
5. Do not use this unit with any solid-state speed control device other than those specied in section 3.1.
6. This unit must be grounded.
7. Do not install in a cooking area or connect directly to any appliances.
8. Do not use to exhaust hazardous or explosive materials and vapors.
9. When performing installation, servicing or cleaning this unit, it is recommended to wear safety glasses and gloves.
10. When applicable local regulation comprises more restrictive installation and/or certication requirements, the aforementioned
requirements prevail on those of this document and the installer agrees to conform to these at his own expenses.
CAUTION
1. To avoid prematurely clogged lters, turn the unit OFF during construction or renovation. Do not use the unit when sanding drywall.
Certain types of dust and vapors may damage the system.
2. Please read specication label on product for further information and requirements.
3. Be sure to duct air outside – Do not intake/exhaust air into spaces within walls or ceiling or into attics, crawl spaces, or garage. Do
not attempt to recover the exhaust air from a dryer or a range hood.
4. Do not run any air ducts directly above or within 2 ft (0.61 m) of a furnace or its supply plenum, boiler, or other heat producing
appliance. If a duct has to be connected to the furnace return plenum, it must be connected 10’ (3.1 m) away from plenum’s
connection to the furnace.
5. The ductwork is intended to be installed in compliance with all applicable local and national codes.
6. When leaving the building for a long period of time (more than two weeks), a responsible person should regularly check if the unit
operates adequately.
7. If the ductwork passes through an unconditioned space (e.g.: attic), the unit must operate continuously except when performing
maintenance and/or repair. Also, the ambient temperature of the building should never drop below 18°C (65°F).
8. At least once a year, the unit mechanical and electronic parts should be inspected by qualied service personnel.
9. Make sure at all times that the outside intake and exhaust hoods are free from any snow during the winter season. It is important to
check the unit during a big snow storm, so it doesn’t draw in any snow. If this is the case, please turn the unit OFF for a few hours.
WARNING
1. Safety Considerations
Hazards may exist within this equipment because it contains electrical and powerful moving components.
Only qualied service personnel should install or service this equipment. Untrained personnel can perform basic maintenance such as
maintaining lters.
Observe precautions marked in literature and on labels attached to unit. Follow all safety codes.
!

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2. Installation
2.1 Inspection
Inspect the exterior of the unit for shipping damage by ensuring that there is no damage to the door, door latches, door hinges,
damper, duct collars, cabinet, etc. Inspect the interior of the unit for damage by ensuring that the fan motors and housings, heat or
energy recovery cores, insulation, dampers, actuators and drain pans are all intact.
If transportation damage is found, le a claim immediately with the transportation agency. Remove all packaging, tape, etc. from the
cabinet.
2.2 Mounting Location Requirements
When determining an installation location, the unit must be mounted in a heated area to prevent condensate drain lines from freezing.
The mounting location should be away from occupied areas to provide quiet operation. The area should also be easily accessible for
maintenance.
NOTE: These units have minimum clearance requirements when mounting. See Appendix B for specic clearance requirements.
Mounting options must allow 12” (305 mm) clearance in front of control cover for access.
A mounting location close to an exterior partition will minimize the length of insulated duct. The unit should be close to a drain and
120volt, 60 Hz power supply. The unit should be mounted away from hot chimneys, electrical panels and other hazards.
2.3 Mounting Options
NOTE: Remove and discard the metal plate screwed on the unit to prevent the door from opening during transport.
There are several options for hanging or oor mounting the unit.
NOTE: In all cases, the unit must be level. Consult local building code for restrictions in your area regarding installation.
Hang the unit with the reinforced rubber straps provided as shown in Appendix A. Check with local building codes regarding the use
of rubber straps in commercial buildings. Attach the straps to the unit with two no. 8 screws provided. Then attach the other end of the
strap to the ceiling joists, trusses, custom frame, etc.
The unit can also be hung with 3/8” (10 mm) threaded rod and U channels or angles (not supplied) as shown in Appendix A.
When installing the unit, keep in mind that access to the control panel may be required. Supply and exhaust ducts to outdoors may have
1” to 2” (25 mm to 51 mm) of insulation on them. Rubber vibration isolation may be required and is recommended for quiet operation.
The unit can also be mounted on a metal or wooden curb (not supplied) bolted to the oor as shown in Appendix A. Space must be left under
the unit to allow connection of drain lines. A gradual slope is required for the condensate water to drain by gravity (minimum 1/4”/foot)
(6 mm/305 mm). If this is not possible, a pump should be used. If attachment of the unit to the curb is required, ensure that screws, bolts
and mounting hardware do not interfere with moving parts or that the integrity of the cabinet insulation is not affected.
2.4 Ductwork
The supply and exhaust duct connections on the unit are as follows:
UNIT DUCT SIZE
B6LC 14” x 8” (356 mm x 203 mm)
B12LC 20” x 8” (508 mm x 203 mm)
NOTE: Duct sizes are for connection purposes only. Ducts should be sized to keep noise and pressure drop to a minimum.
The supply and exhaust ducts connected to outdoors, as well as any ducts passing through an unconditioned space, must have a minimum
insulation value of R5. In addition, a continuous integral vapor barrier over the duct insulation must be used.
WARNING
!
To reduce the risk of injury caused by sharp edges and/or moving parts, it is recommended to wear safety glasses
and gloves while performing these instructions.
VD0523
Metal plate
Metal plate
Left side, standard door Right side, reversed door

5
2. Installation (cont’d)
2.4 Ductwork (cont’d)
Air balancing dampers are recommended for both supply and exhaust ducts to allow for adjustment of airow. Also, exible canvas
connectors should be installed close to the unit in the supply duct to the building and the exhaust duct from the building to reduce
noise transmission from the unit to the building, see Appendix C.
All ports on the B6LC and B12LC units have 1” (25 mm) anges to facilitate the installation of the ductwork. Please note that the
“Fresh Air from Outdoors” port has a defrost damper incorporated with it.
Ensure that any mechanical fasteners used to connect the duct do not interfere with the operation of the damper. Screws can be
installed on the side of the cabinet rather than the ange for this port only. For port locations see Appendix B.
2.5 Internal Grilles and Diffusers
Locate exhaust grilles and supply diffusers to provide effective ventilation and avoid short circuiting of airows. Adjustable dampers
should be provided at every grille and diffuser location to make balancing of the system possible.
A proper selection of style and size of grilles and diffusers is required to minimize pressure drop. The velocity of the airow should not
exceed 400 ft./min. (2 m/sec.) for normal applications.
The duct system should be designed according to the high speed ow rate of the unit. In order to keep the noise and pressure drop
to a minimum, a maximum air velocity of 1100 ft./min. (5.6 m/sec.) should be used in calculations in duct design. The duct runs should
be kept as short as possible with the minimum amount of elbows and transitions.
The manufacturer recommends the use smooth radius elbows or square elbows with turning vanes to achieve maximum performance.
2.6 Exterior Hoods
It is important that the fresh air intake hood be positioned well away from any source of contamination. The exterior supply and
exhaust hoods must be separated enough to prevent cross-contamination and at an elevation that will prevent blockage by snow, dirt
and leaves.
NOTE: Consult local building code for restrictions in your area.
A rodent screen with 1/4” (6 mm) mesh must be installed to prevent the intake of large debris and animals. A backdraft damper may
need to be installed in the exhaust duct to prevent cold air entering the building if the unit is to be shut off for a long period of time.
To maintain optimum airow performance, exterior hood selection must be such that the minimum free area of opening is as follows:
140 inches (0.09 m).
2.7 Drains
The drain ttings provided with the unit will accept a 3/4” (19 mm) NPT coupler (supplied by others). The drain line for the unit must
be fabricated on-site and connected to the building main. A loop in the hose or trap in the copper or plastic pipe must be provided to
prevent sewer gases from entering the unit when connecting to a drain as illustrated in Appendix D.
NOTE: Consult local building code for plumbing requirements in your area. If copper pipe is to be used, ensure not to solder to the
3/4” (19 mm) coupler while it is attached to the plastic drain tting as deformation may occur. Ensure adequate slope is present
to allow good drainage (minimum 1/4” per foot or 6 mm per 305 mm).
2.8 Electrical Connections
POWER
A terminal block and strain relief bushing or a junction box is provided for line voltage to make the necessary power connections.
The electrical requirements are as follows:
B6LC B12LC
VOLTAGE 120 V 120 V
MCA 9.50 A 14.30 A
MOP 15.00 A 20.00 A

6
3. Controls
3.1 General Information
FAN INTERLOCK RELAY OUTPUT (FF)
External fan control can be achieved by connecting an external 24 volts fan control through dry contacts (FF). These contacts are closed
on a call for ventilation or defrost. See wiring diagram shown in Appendix E.
SPEED SELECTION
There are three speed settings available with the controls, only two of which can be functional at any one time. The units are factory set
to use the low and high speed taps on the blower motors. If necessary, the medium speed tap can be used instead of the low speed
tap. See wiring diagrams for instructions on how to make this change. Units without the remote wall control option can be shut off by
opening the contact between LOW - COM or HIGH - COM as shown in Appendix E-2.
3.2 Sequence of Operation
Before start-up, check the unit for obstructive packaging, objects near or in blowers, dampers, heat exchangers, etc. Once installation
is complete, check all modes of operation to ensure that the unit is working properly. Close the doors and check for operation on LOW,
COM and HIGH. Use a wall control or the dry contact switching to run fan speeds as shown in Appendix E-2.
UNIT CHECK POINTS (ALL UNITS):
• Power connected, no ventilation call - Both fans are off, defrost damper (if equipped) closes off fresh air from outdoors.
• Power connected, low speed call - Both fans on low speed internal defrost damper (if equipped) opens fresh air from outdoors. If the
unit is equipped with recirculation module, the internal defrost damper closes recirculation opening.
• Power connected, high speed call - Both fans on high speed, defrost damper opens fresh air from outside. If the unit is equipped
with recirculation module, the internal defrost damper closes recirculation opening.
• Power connected, occupied timer/sensor connection open (unoccupied mode) - Both fans are off, defrost damper closes fresh air
from outdoors. If the unit is equipped with recirculation module, the internal defrost damper opens recirculation opening.
• Power connected, FF control contacts close during unit ventilation or defrost cycle.
3.3 Defrost
The unit functions are controlled by integrated controls in the unit which may include Exhaust Only Defrost or Recirculation Defrost (via
the recirculation module). In cold temperatures, defrost cycles will remove frost from the heat recovery core to maintain good operation.
EXHAUST ONLY DEFROST (OPTIONAL)
Frost removal occurs when the supply blower de-energizes, the supply air damper and the core damper close and the exhaust fan
continues to circulate only warm inside air through the heat recovery core or energy recovery core to maintain ventilation. This process
prevents the build up of ice in the core. Defrost is temperature initiated at 23°F to -22°F (-5°C to -30°C) and time based.
RECIRCULATION DEFROST MODULE (OPTIONAL - FACTORY INSTALLED)
The defrost cycle is electronically controlled in response to the outdoors temperature 23°F to -22°F (-5°C to -30°C). On a call for defrost,
the supply air damper in the recirculation module closes, exhaust fan is de-energized and the supply fan continues to recirculate warm air
through the heat recovery core or energy recovery core. It is possible to extend the defrost times during very cold weather by removing
the jumper JU1-F on the circuit board as shown in Appendix F. For dimension and weight changes to the B6LC and B12LC models with
recirculation defrost, see Appendix B-2 and B-4.
3.4 Remote Wall Control (Optional)
Remote mounted wall control options can be used to control the ventilators from a location remote to the installed unit location. The
connection from the ventilator to the control is low voltage and requires a 4 conductor (24 ga. minimum) LVT cable. Models are available
with a dehumidistat control. The following option is available.
SLIDE SWITCH TYPE
Dehumidistat to engage high speed exchange. Slide switch operation supporting continuous low exchange and continuous high
exchange.
WARNING
!
A negative building pressure may develop during the defrost cycle with possible back drafting fumes from
combustion equipment, which may have severe health consequences.

7
5. Maintenance
5.1 Bi-Monthly Maintenance
Bi-monthly maintenance should include:
AIR FILTERS
The standard foam lters are washable. Under normal conditions it is recommended that they be cleaned every two months.
More frequent cleaning may be required under extremely dirty operating conditions. Use a vacuum cleaner to remove the heaviest
portion of accumulated dirt, then wash with warm water.
A medium efciency lter for the supply air stream is available from your supplier. This lter is disposable and should be replaced
when it becomes dirty.
B6LC and B12LC units
Washable foam lters
MEF lter - optional
DRAIN PANS AND INTERIOR OF UNIT
With the lters removed from the unit, the foil faced insulation surfaces and the drain pans should be wiped clean with a soft cloth and
mild cleaning solution. Also ensure that the drain ttings are free from dirt and are draining freely.
WARNING
!
Risk of electric shocks. Before performing maintenance, always stop the unit, then turn power off at service panel.
The wearing of safety glasses and gloves is recommended when handling unit components to prevent injuries
caused by sharp edges.
1
1
2
VL0001
4. Airow Measurement and Balancing
Once installation is complete, the supply and exhaust airows should be balanced. This will ensure proper operation and a good quality
installation.
A well designed duct system with properly sized duct runs and equal static pressure losses of both the supply and exhaust will aid in
balancing the unit. However, it will be necessary to take ow measurements with the proper equipment to ensure a balanced system.
Before proceeding with balancing, all windows, overhead doors and walk-in doors should be closed and exhaust systems should be
turned off.

8
5. Maintenance (cont’d)
5.2 Annual Maintenance
Annual maintenance should include:
AIR FILTERS
Vacuum and wash standard foam lters. Replace medium efciency lter if present.
DRAIN PANS AND INTERIOR OF UNIT
Wash the foil faced insulation surfaces and wipe the drain pans with a soft cloth and mild cleaning solution. Check the drain ttings to
ensure they are draining freely.
RECOVERY CORE
The recovery core must be handled with care. It is recommended that it be washed once a year following the season of most intense
use, in order to ensure maximum efciency of the partitions.
FANS
Blower wheels and fan housing should be checked for dirt build-up. If they appear dirty, it may be necessary to remove the blower
assembly and then vacuum the dust out through the fan mouth. See next page for instructions on removing the blower assembly.
WARNING
!
Risk of electric shocks. Before performing maintenance or repairs, always stop the unit, then turn power off at
service panel. The wearing of safety glasses and gloves is recommended when handling unit components to
prevent injuries caused by sharp edges.
HEAT RECOVERY CORE ERV HM CORE
CAUTION CAUTION
Hot water and a strong cleaning agent could damage
the polypropylene core. Ensure the core is returned to
the unit in the correct orientation. Use the sticker as a
guide.
Do not soak the ERV HM core in water. This core can
easely be damaged especially if it is soaked.
Allow the heat recovery core to soak for three hours in warm water
and mild soap. Rinse under a heavy stream of water.
For ERV HM core, use a vacuum cleaner or low pressure air jet. It
is not recommended to use solvents or detergents as these may
damage the media or structure of the core.
6. Service
6.1 Parts Replacement
SYSTEM OPERATION CHECK
Verication of all control modes should be checked to ensure proper operation. Refer to 3.2 Sequence of Operation section.
TESTING AND REPLACEMENT OF THE DAMPER ACTUATOR
Check damper operation by switching between LOW - COM or HIGH - COM on the dry contact terminal or by switching through the
modes on the optional remote wall control. If the damper does not respond in one or both directions, check all connections.
CAUTION: 120 VAC. Check for 120 volt output across the WHITE/BLACK wires. If 120 volts can be measured at the motor, replace
the motor. If 120 volts cannot be measured at the motor, check pins J1-9 at the printed circuit board.
MAIN CIRCUIT BOARD REPLACEMENT
The main circuit board must be replaced if an electronic problem arises. For example, the unit suddenly stops, the unit stays in defrost
all of the time or if control functions are not working properly. Ensure that power is reaching the board. Test the blower motors and
damper actuators for operation when directly connected to the appropriate power voltage. If the motor and damper actuators function
normally, replace the main circuit board.
WARNING
!
High voltage, risk of electric shocks. Only qualied service personnel should service this equipment. The wearing
of safety glasses and gloves is recommended since a few diagnosis procedures may require the unit to be in
operation while proceeding. Be careful with moving and live parts to prevent injuries.

9
6. Service (cont’d)
6.1 Parts Replacement (cont’d)
MOTOR AND BLOWER REMOVAL AND INSTALLATION
Disconnect power from the unit. To determine if the fan motor is burned out, disconnect the four-wire service connector between the
motor and cabinet. Connect the motor directly to a 120 volts power source with an electrical cable, as follows:
RED + WHITE Low speed
BLUE + WHITE Medium speed
BLACK + WHITE High speed
If the motor functions normally, there is a problem with the wiring connections or the main circuit board. Check all wiring and replace
main circuit board if necessary.
If the blower does not run, it must be replaced. To replace the motor, remove the recovery core from the unit. Disconnect the four-wire
service connector from the unit. Remove the fasteners holding the motor assembly in place. Lift the assembly up and out, using one
hand under the motor and one hand to steady it. Remove the assembly carefully from the unit to avoid damage to the insulation, shelf,
etc. Install the repaired motor assembly by following these instructions in reverse.
CAPACITOR
LOCKING PLATE
REMOVE THESE
TWO SCREWS
VD0004A
B6LC and B12LC units
6.2 Troubleshooting
SYMPTOMS POSSIBLE CAUSES SOLUTIONS
Inside air is too dry. Over ventilation - speed setting too
high.
Dehumidistat setting is too low.
Adjust speed setting.
Set dehumidistat control in a higher position
(if applicable).
Persistent condensation on windows,
walls, ceilings, etc.
Improper adjustment of dehumidistat
control.
Improper ventilation rate.
Window frame is too cold or leaky.
Adjust dehumidistat control knob to a lower setting.
Install a dehumidistat (option).
Repair window frame.
Unit stops functioning. Electrical supply interrupted. Check the unit circuit breaker.
Air from supply diffusers too cold. Imbalance of supply and exhaust air.
Outdoor temperature very cold.
Check lters and cores for blockage.
Check balance of airows.
Install electric duct heater if necessary.
Unit makes annoying noise. Blower wheel out of alignment. Remove the motor/blower assembly
and adjust blower wheel.
Core freezing up. Imbalance of supply and exhaust air.
Defrost damper not functioning.
Check lters and cores for blockage.
Check balance of airows.
Check for operation of both defrost damper actuators.
For technical assistance and warranty information,
please call your local supplier.
WARNING
!
The wearing of safety glasses and gloves is recommended since a few diagnosis procedures may require the unit
to be in operation while proceeding. Be careful with moving and live parts to prevent injuries.

10
7. Service parts
7.1 B6LC-B12LC Exhaust Defrost
B
C D E
F
G
H
I
JK
M
L
N
VL0068
Ref. Part No. Description
B13036 Hinge kit (male-female)
C
SV1808139 Core Defrost Actuator B6LC-B12LC
SV63341 Core Defrost Actuator B12LC, Powder
Coated
D
SV63327 Core Damper B6LC
SV63328 Core Damper B12LC
SV63329 Core Damper B12LC, Powder Coated
E
SV201982 Fresh Air Damper B6LC
SV63330 Fresh Air Damper B12LC
SV63331 Fresh Air Damper B12LC Powder Coated
F
SV1808138 Fresh Air Damper Act. B6LC-B12LC
SV63332 Fresh Air Damper Actuator B12LC
Powder Coated
GSV201805 Filter SWF 13.125" x 11.25" x 1" (unitary)
H
SV1604191 Core Aluminum B6LC-B12LC (unitary)
SV1604191 Core Aluminum B6LC-B12LC (unitary)
SV1607787 ERV HM Core B6LC-B12LC (unitary)
ISV16035 Door Latch-Keeper Kit
JSV1607456 Drain Fitting B6LC, B12LC (unitary)
KSV63342 Optional MERV8 Filter for B6LC, B2LC
(unitary)
Ref. Part No. Description
L *
SV1808130 PCB Electronic B6LC, B12LC
SV202382 Thermistor B6LC, B12LC
SV500025914 Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, B6LC, B12LC
SV500025915 Relay DPST 120 VAC, 1 HP,
30 A @ 120 VAC, B6LC, B12LC
M
SV1808144 Blower Ass’y B6LC
SV1808148 Blower Ass’y B12LC
SV1808148P Blower Ass’y B12LC, Powder Coated Option
SV1808142 Blower Wheel B6LC, B12LC (not shown)
SV1808149 Fan Motor B6LC (not shown)
SV1808150 Fan Motor B12LC (not shown)
SV63110 Capacitor 5 F LC, B1600705 (not shown)
NSV208507 Terminal Strip 10-Pin Molex 38721-6710,
B6LC, B12LC
* SV63571 Door Assembly B6LC, B12LC
* SV63572 Door Assembly B12LC
(Powder Coated Option)
* SV1808145 Accessories kit B6LC, B12LC
* SV63344 Hanger Strap 18" Kit B6LC, B12LC
* Not Shown.
NOTE 1:C and D not available for ERV HM Core
NOTE 2:H 2 cores required for B6LC units
3 cores required for B12LC units
NOTE 3:G 4 filters for B6LC units
6 filters for B12LC units
NOTE 4:K 2 filters for B6LC units
3 filters for B12LC units

11
7. Service parts (cont’d)
7.2 B6LC-B12LC Recirculation Defrost B
C
D
DE F
G
I
J
H
K
L
M
VL0069
Ref. Part No. Description
BSV13036 Hinge kit (male-female)
CSV1604191 Core Aluminum B6LC-B12LC (unitary)
SV1607787 ERV HM Core B6LC-B12LC (unitary)
DSV201805 Filter SWF 13.125" x 11.25" x 1" (unitary)
E
SV63333 Recirculation Damper B6LC
SV63334 Recirculation Damper B12LC
SV63335 Recirculation Damper B12LC, Powder Coated
FSV225855
Damper Motor Belimo LMB24-3-T,
B1600705, B6LC-B12LC
(Recirculation Defrost Option)
G *
SV201603 Terminal Strip 3-Pin Molex 38721-6703
B6LC, B12LC (Recirculation Defrost)
SV63352 Relay DPDT 24 VAC, 1/2 HP, 15 A @ 120 VAC,
B6LC, B12LC (Recirculation Defrost Option)
SV500025914 Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, B6LC, B12LC
SV64098 Transformer 120-24V 40VA
HSV16035 Door Latch-Keeper Kit
ISV1607456 Drain Fitting B6LC, B12LC (unitary)
JSV63342 Filter Optional MERV 8, B6LC, B12LC (unitary)
Ref. Part No. Description
K *
SV1808130 PCB Electronic B6LC, B12LC
SV202382 Thermistor B6LC, B12LC
SV500025914 Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, B6LC, B12LC
SV500025915 Relay DPST 120 VAC, 1 HP,
30 A @ 120 VAC, B6LC, B12LC
L
SV1808144 Blower Ass’y B6LC
SV1808148 Blower Ass’y B12LC
SV1808148P Blower Ass’y B12LC Powder Coated Opt.
SV1808142 Blower Wheel B6LC, B12LC (not shown)
SV1808149 Fan Motor B6LC (not shown)
SV1808150 Fan Motor B12LC (not shown)
SV63110 Capacitor 5 F LC, B1600705 (not shown)
MSV208507 Terminal Strip 10-Pin Molex 38721-
6710, B6LC, B12LC
* SV63571 Door Assembly B6LC, B12LC
* SV63572 Door Assembly B12LC
(Powder Coated Option)
* SV1808145 Accessories kit B6LC, B12LC
* SV63344 Hanger Strap 18" Kit B6LC, B12LC,
B1600705
* SV64228 Backdraft damper B6LC recirculation
* SV64229 Backdraft damper B12LC recirculation
* Not Shown.
NOTE 1:C 2 cores required for B6LC unit
3 cores required for B12LC unit
NOTE 2:D 4 filters for B6LC unit
6 filters for B12LC unit
NOTE 3:J 2 filters for B6LC unit
3 filters for B12LC unit
* Not Shown.

12
Appendix A
MOUNTING DIAGRAM
B6LC AND B12LC UNITS
Space must be left to allow connection
of drain lines with adequate slope for drainage
Wooden Curb (Supplied by others)
Bolt to Floor
Rubber Vibration Isolator
(Supplied by others)
U Channel
(Supplied by others)
3/8" (10mm)
Threaded Rod
(Supplied by others)
NOTE: Diagrams show standard unit configuration.
For units with the reversed door option, the
door will be located here.
Reinforced
Rubber Strap
VD0002A
Recirculation Module
(Factory Installed)
Recirculation Module
(Factory Installed)
Recirculation Module
(Factory Installed)

13
Appendix B
UNIT DIMENSIONS
B-1: B6LC (WITHOUT RECIRCULATION MODULE)
4.000"
3.535"
4.000"
28.005"
14.000"
5.859"
13.375"
23.500"
2.750" 14.000" 6.500"
8.000" 8.000"
14.103"
7.705"
4.000"
24.500"
12.005"
4.028"
34.000"
19.207" 5.125"
10.005"
12.000" 15.000"
EXHAUST AIR
OPENING
SUPPLY AIR
OPENING
LINE POWER
EXHAUST AIR
OUTDOOR AIR
RETURN AIR
SUPPLY AIR
A
B
LOW VOLTAGE TERMINAL STRIPS
CONTROL BOX ACCESS
REVERSE DOOR
OPTION
LEFT SIDE
CD
B
A
TOP
NOTE: FOR UNITS WITH THE REVERSED DOOR OPTION, INTERIOR COMPONENTS WILL APPEAR AS A MIRROR IMAGE OF THE ABOVE DIAGRAM.
FRONT
STRAP MOUNTING
LOCATION
OUTDOOR AIR
OPENING
RETURN AIR
OPENING
DRAIN LINE FITTING
RIGHT SIDE
A MINIMUM OF 12.000" CLEARANCE FROM ANY OBSTRUCTION IS REQUIRED FOR REMOVAL OF CONTROL BOX. A MINIMUM OF 15.000" CLEARANCE FROM ANY OBSTRUCTION IS REQUIRED FOR
REMOVAL OF HEAT RECOVERY CORES, FANS, ETC. THE ACCESS DOOR CAN BE REMOVED FROM CABINET WITH ONLY 2.000" OF CLEARANCE.
CONTROL PLATE
ACCESS DOOR
CORE
REVERSED DOOR OPTION
Center of gravity
Direction of airflow
NOTES:
PTS
B6LC POLY CORE B6LC ALUMINUM CORE
LB.
38.49 24.96 51.29 33.26
148.00
Kg
17.45
11.32
23.26 15.08 67.13
PTS
A B
C
D
TOTAL
LB.
44.21 28.67 58.92 38.21
170.00
20.00 13.00 26.72
17.30
77.11
Kg
A B
C
TOTAL
D
14 Gauge wire nut Condensate drain fitting (2 x)
A B3/4" NPT
CONNECTION TABLE
CONNECTION SIZES
NOTE: THIS MODEL HAS A DAMPER LOCATED ON THE OUTDOOR INTAKE CONNECTION. THIS DAMPER WILL CLOSE DURING A DEFROST CYCLE OR WHEN THE UNIT IS PLACED IN THE 'OFF' POSITION WITH POWER MAINTAINED TO THE UNIT. THIS DAMPER IS NOT DESIGNED AS A BACKDRAFT DAMPER AND WILL REMAIN OPEN IF POWER IS DISCONNECTED FROM THE UNIT FOR ANY REASON.
VK0108A
8.000" 8.000"
B6LC ERV HM CORE
PTS LB. Kg
A
B
C
D
TOTAL
40.80 26.52 54.30 35.31
156.96
18.88 12.27 25.12
16.33
72.60

14
Appendix B (cont’d)
UNIT DIMENSIONS
B-2: B6LC WITH RECIRCULATION MODULE (FACTORY INSTALLED)
28.12"
14.00"
4.00"
1.75"
8.00"
2.75"
19.207"
5.125" Access Door
Strap Mounting
Location
Drain Fitting
NOTE: For units with the reversed door option, interior components will appear as a mirror image of the above diagram.
49.550"
Line Power
Control Box
Dry Contacts
Reverse Door Option
Fresh Air
to Building
Exhaust Air
to Outdoors
8.00"
4.00"
24.50"
3.53"
12.00" 15.00"
Access Door
Core
Reversed Door Option
Control Plate
A minimum of 12.00" clearance from any obstruction is required for removal of control box.
A minimum of 15.00" clearance from any obstruction is required for removal of heat recovery cores, fans, etc. The access door can be removed from cabinet with only 2.00" of clearance.
8.00"
8.00"
14.10"
14.00" 7.10"
Fresh Air
From Outside
Exhaust Air
From Building
4.00" 1.75"
VK0109A
B6LC POLY CORE
with recirculation module
B6LC ALUMINUM CORE
with recirculation module
LB.
197
Kg
90
PTS
TOTAL
LB.
231 105
Kg
TOTAL
PTS
B6LC ERV HM CORE
with recirculation module
PTS
TOTAL
LB.
206 95
Kg

15
Appendix B (cont’d)
UNIT DIMENSIONS
B-3: B12LC (WITHOUT RECIRCULATION MODULE)
41.206"
40.326"
20.000"
5.715"
20.620"
14.250"
34.000"
5.125"
19.207"
4.028"
11.325"
12.000"
15.000"
20.000"
4.000"
2.750"
11.000" 20.000" 9.878"
24.500"
8.000"
8.000"
4.000"
8.000"
10.000"
B
A
FRESH AIR
TO BUILDING
EXHAUST AIR
TO OUTDOORS
LINE POWER
LOW VOLTAGE TERMINAL STRIPS
CONTROL BOX ACCESS
CONTROL COVER
ACCESS DOOR
CORE
REVERSED DOOR OPTION
ACCESS DOOR DRAIN FITTING
EXHAUST AIR
FROM BUILDING
FRESH AIR
FROM OUTDOORS
STRAP MOUNT LOCATION
REVERSE DOOR
OPTION
CD
B
A
TOP
OUTDOOR AIR
RETURN AIR
NOTE: FOR UNITS WITH THE REVERSED DOOR OPTION, INTERIOR COMPONENTS WILL APPEAR AS A MIRROR IMAGE OF THE ABOVE DIAGRAM.
A MINIMUM OF 12.000" CLEARANCE FROM ANY OBSTRUCTION IS REQUIRED FOR REMOVAL OF CONTROL BOX.
A MINIMUM OF 15.000" CLEARANCE FROM ANY OBSTRUCTION IS REQUIRED FOR REMOVAL OF HEAT RECOVERY CORES, FANS, ETC. THE ACCESS DOOR CAN BE REMOVED FROM CABINET WITH ONLY 2.000" OF CLEARANCE.
EXHAUST AIR
SUPPLY AIR
FRONT VIEW
RIGHT SIDE
LEFT SIDE
Center of gravity
Direction of airflow
NOTES:
PTS
B12LC POLY CORE B12LC ALUMINUM CORE
LB.
54.02 38.98 54.02 38.98
186.00
Kg
24.50 17.68 24.50 17.68 84.36
PTS
A B
C D
TOTAL
LB.
60.41 43.59 60.41 43.59
208.00
27.40 19.77 27.40
19.77 94.34
Kg
A B
C
TOTAL
D
14 GAUGE WIRE NUT CONDENSATE DRAIN FITTING (2X)
A B3/4" NPT
CONNECTION TABLE
CONNECTION SIZES
NOTE: THIS MODEL HAS A DAMPER LOCATED ON THE OUTDOOR INTAKE CONNECTION. THIS DAMPER WILL CLOSE DURING A DEFROST CYCLE OR WHEN THE UNIT IS PLACED IN THE 'OFF' POSITION WITH POWER MAINTAINED TO THE UNIT. THIS DAMPER IS NOT DESIGNED AS A BACKDRAFT DAMPER AND WILL REMAIN OPEN IF POWER IS DISCONNECTED FROM THE UNIT FOR ANY REASON.
VK0110A
B12LC ERV HM CORE
PTS LB. Kg
A B
C D
TOTAL
57.84 41.68 57.92 41.68
199.00
26.84 19.35 26.88
19.34 92.41

16
Appendix B (cont’d)
UNIT DIMENSIONS
B-4: B12LC WITH RECIRCULATION MODULE (FACTORY INSTALLED)
8.00"
1.75"
10.00" 20.00"
2.75"
Line Power
Dry Contacts
49.550"
Strap Mounting
Location
Fresh Air
From Outdoor
Exhaust Air
From Building
5.125"
Core
Reversed Door Option
Access Door
15.00"
Drain Fitting
Access Door
20.000"
20.000"
10.000"
19.207"
Control Box
NOTE: For units with the reversed door option, interior components will appear as a mirror image of the above diagram.
A minimum of 12.00" clearance from any obstruction is required for removal of control box.
A minimum of 15.00" clearance from any obstruction is required for removal of heat recovery cores, fans, etc. The access door can be removed from cabinet with only 2.00" of clearance.
Reversed Door Option
Exhaust Air
To Outside
Fresh Air
To Building
41.24"
2
4.50"
8.00"
4.00" 3.53"
8.00" 8.00"
4.00" 1.75"
V
K0111A
12.00"
Control Cover
PTS
B12LC POLY CORE
with recirculation module
B12LC ALUMINUM CORE
with recirculation module
LB.
247
Kg
112
PTS
TOTAL
LB.
269 122
Kg
TOTAL
B12LC ERV HM CORE
with recirculation module
PTS
TOTAL
LB.
269 122
Kg

17
Appendix C
BALANCING DAMPERS POSITION
Balancing
Damper
VJ0135A Canvas Vibration Isolator
Reverse Door Option
Exhaust Air
From Building
Fresh Air
From Outdoors
Min. 8" (203 mm)
(Optional) Canvas Vibration Isolator
Gravity Backdraft Damper
(for recirculation
defrost option only)
Min.12" (305 mm)
Exhaust Air
to Outdoors
Fresh Air
to Building
Appendix D
DRAIN CONNECTIONS
Min. 3”
[76 mm]
Min. 1”
[25 mm]
3/4” NPT
coupler
Water trap
Min. 4”
[102 mm]
Min. 4”
[102 mm]
Plastic hose
To drain
NOTES:
1. All hose, pipe and couplers to be supplied by others.
2. Slope drain lines minimum 1/4” per foot.
Min. 1”
[25 mm]
Min. 3”
[76 mm]
Plastic drain fitting
To drain
Copper or
plastic pipe
VO0002A

18
Appendix E
TERMINAL CONTROL DIAGRAMS
A low voltage remote control wiring interface is provided on
the unit. The connections for the low voltage remote wiring are
located on two terminals adjacent to the exhaust fan outlet (or
adjacent to the supply fan outlet on the B1600705 unit). All eld
installed wiring must be low voltage class II.
REMOTE WALL CONTROL
Optional wall control requires a 4 wire LVT-24 gauge (or
equivalent). This remote wall control runs on 12 VDC.
LOW VOLTAGE CONTROLS
All other terminals are dry contacts.
Low Voltage terminal control consists of the following:
WALL CONTROL
4 wire LVT 24 gauge minimum
OCCUPIED (NIGHT SET BACK) TIMER/SENSOR
24 VAC, needs dry contact
LOW - COM - HIGH
Remote fan switching requires a single pole, double throw switch
(SPDT)
FAN INTERLOCK RELAY OUTPUT (FF)
Dry contact closes on ventilation or defrost. Used to control
external fan.
One type of remote wall control is available: the Slide Switch Wall
Control with fan switch and dehumidistat control.
The remote wall controls work with the microprocessor electronic
control within the unit to control ventilation sequences. This wall
control requires a 4-wire connection to the unit as shown below.
Without the wall control, fans can be operated with a remote fan
switch as shown in Appendix E-4.
NOTE:
When using a wall control, never use the the LOW, COMMON and
HIGH terminals.
E-1: TERMINAL LABEL E-2: WALL CONTROL CONNECTION
VE0466A
Wall
Control
JUMPER
WALL CONTROL
COMMANDE MURALE
NOTE:
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Black/Noir
ON-OFF/
MARCHE-
ARRÊT
LOW
BASSE
COMMON
COMMUN
HIGH
HAUTE
Green/Vert
Red/Rouge Yellow/Jaune
F
F
CLASS 2 LOW
VOLTAGE /
CLASSE 2 BASSE
TENSION
L'utilisation d'un circuit 24
VCA nécessite des contacts
isolés (ex. thermostat) pour
éviter l'interconnexion des
sorties de Classe 2.
WALL CONTROL
COMMANDE MURALE
NOTE:
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Black/Noir
ON-OFF/
MARCHE-
ARRÊT
LOW
BASSE
COMMON
COMMUN
HIGH
HAUTE
Green/Vert
Red/Rouge Yellow/Jaune
F
F
CLASS 2 LOW
VOLTAGE /
CLASSE 2 BASSE
TENSION
L'utilisation d'un circuit 24
VCA nécessite des contacts
isolés (ex. thermostat) pour
éviter l'interconnexion des
sorties de Classe 2.

19
Appendix E (cont’d)
TERMINAL CONTROL DIAGRAMS
Occupancy control is achieved by connection to the terminal
interface shown below. These terminals require a dry contact
which could be provided by a number of types of controls such
as a timer, light sensor, occupancy sensor, building management
system, or other. The unit will not operate unless these contacts
are closed!!
The illustration below shows a factory installed jumper and
programmable timer option (supplied by others).
Remote fan control can be achieved by connecting dry
contact controls to the terminal interface at terminals labeled:
LOW - COM - HIGH.
These controls could be the following: SPDT switch, dehumidistat,
CO2sensor, light sensor, timer, building management system, etc.,
supplied by others.
The illustration below represents a switch connected to the unit.
E-3: OCCUPIED TIMER/SENSOR CONNECTION
(NOT SOLD BY BROAN)
E-4: REMOTE FAN CONTROL
Appendix F
CONTROL BOX ASSEMBLY B6LC AND B12LC
Control cover plate
Control box
Remote control access plate
Remote wiring terminal block
Unit cabinet
VE0001A
JUMPER
(factory installed)
OCC. CONTROL
(field installed)
NSB Timer
1
M
2345
JUMPER
24 (-) VAC
24 (+) VAC
WALL CONTROL
COMMANDE MURALE
NOTE:
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Black/Noir
ON-OFF/
MARCHE-
ARRÊT
LOW
BASSE
COMMON
COMMUN
HIGH
HAUTE
Green/Vert
Red/Rouge Yellow/Jaune
F
F
CLASS 2 LOW
VO LTAGE /
CLASSE 2 BASSE
TENSION
L'utilisation d'un circuit 24
VCA nécessite des contacts
isolés (ex. thermostat) pour
éviter l'interconnexion des
sorties de Classe 2.
WALL CONTROL
COMMANDE MURALE
NOTE:
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Black/Noir
ON-OFF/
MARCHE-
ARRÊT
LOW
BASSE
COMMON
COMMUN
HIGH
HAUTE
Green/Vert
Red/Rouge Yellow/Jaune
F
F
CLASS 2 LOW
VO LTAGE /
CLASSE 2 BASSE
TENSION
L'utilisation d'un circuit 24
VCA nécessite des contacts
isolés (ex. thermostat) pour
éviter l'interconnexion des
sorties de Classe 2.
JUMPER
REMOTE
LOW HIGH
FAN SWITCH
WALL CONTROL
COMMANDE MURALE
NOTE:
Use of 24 VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Black/Noir
ON-OFF/
MARCHE-
ARRÊT
LOW
BASSE
COMMON
COMMUN
HIGH
HAUTE
Green/Vert
Red/Rouge Yellow/Jaune
F
F
CLASS 2 LOW
VOLTAGE /
CLASSE 2 BASSE
TENSION
L'utilisation d'un circuit 24
VCA nécessite des contacts
isolés (ex. thermostat) pour
éviter l'interconnexion des
sorties de Classe 2.
VE0467A

20
B6LC UNITS Outdoor Air -40°F Outdoor Air -22°F Outdoor Air -4°F Outdoor Air 14°F Outdoor Air 32°F
Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature
Supply
Air
(CFM)
Supply
Air
(L/s)
55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F
kW kW kW kW kW kW kW kW kW kW kW kW kW kW kW
700 330 7.4 10.4 11.5 5.6 8.6 9.7 3.9 6.8 8.0 2.1 5.1 6.2 0.3 3.3 4.4 650 307 6.6 9.4 10.5 5.0 7.8 8.9 3.4 6.2 7.3 1.8 4.6 5.6 0.2 3.0 4.0 600 283 5.9 8.5 9.4 4.5 7.0 8.0 3.0 5.6 6.5 1.6 4.1 5.1 0.1 2.7 3.7 550 259 5.2 7.6 8.5 3.9 6.3 7.2 2.6 5.0 5.9 1.3 3.7 4.6 0.1 2.4 3.3 500 236 4.0 6.1 7.0 3.0 5.1 5.9 1.9 4.0 4.9 0.9 3.0 3.8 - 1.9 2.7 450 212 3.0 4.9 5.6 2.1 4.0 4.8 1.3 3.2 3.9 0.4 2.3 3.1 - 1.5 2.2 400 189 2.2 3.9 4.6 1.5 3.2 3.9 0.9 2.5 3.2 0.2 1.9 2.5 - 1.2 1.8
Although the B6LC and B12LC models have good efciencies, the supply air could be colder than the ambient room air. It is possible to eliminate the discomfort associated with this temperature difference by installing an electric duct heater. This will temper the air before it is distributed throughout the building. The tables below gives the heating requirements at different temperatures and airows. NOTE: The data does not reect a reduction in effectiveness due to frosting. Based on the standard air at: 1.2 Kg/m3 and Cp = 1.0 KJ/Kg°C 13.35 lb/ft3 and Cp = .24 Btu/lbm°F
Appendix G
MAKE-UP HEAT REQUIREMENTS
B6LC
B12LC UNIT Outdoor Air -40°F Outdoor Air -22°F Outdoor Air -4°F Outdoor Air 14°F Outdoor Air 32°F
Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature
Supply
Air
(CFM)
Supply
Air
(L/s)
55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F
kW kW kW kW kW kW kW kW kW kW kW kW kW kW kW
1250 590 14.6 19.9 21.9 11.2 16.5 18.5 7.8 13.1 15.2 4.4 9.7 11.8 1.0 6.3 8.4 1200 566 13.5 18.6 20.6 10.4 15.5 17.4 7.2 12.3 14.3 4.0 9.1 11.1 0.8 5.9 7.9 1150 542 12.6 17.4 19.3 9.6 14.5 16.4 6.6 11.5 13.4 3.6 8.5 10.4 0.7 5.5 7.4 1100 519 11.2 15.9 17.7 8.5 13.2 15.0 5.8 10.5 12.3 3.1 7.7 9.6 0.4 5.0 6.8 1050 495 10.7 15.2 16.9 8.1 12.6 14.3 5.5 10.0 11.7 2.9 7.4 9.1 0.4 4.8 6.5 1000 472 9.9 14.1 15.7 7.4 11.7 13.3 5.0 9.3 10.9 2.6 6.9 8.5 0.2 4.4 6.1
900 425 8.5 12.4 13.8 6.4 10.2 11.7 4.3 8.1 9.6 2.2 6.0 7.5 0.1 3.9 5.4 800 377 7.0 10.4 11.7 5.2 8.6 9.9 3.4 6.8 8.2 1.7 5.0 6.4 - 3.3 4.6 700 330 5.1 8.1 9.3 3.7 6.7 7.9 2.3 5.3 6.5 0.9 3.9 5.1 - 2.5 3.7
B12LC