Light Commercial
Heat Recovery Ventilators and
Energy Recovery Ventilators
Installation, Operation
and Service Instructions
VB0002
VB0003
6LC, V6LC 7000
VB0001
12LC, V12LC
207428 rev. 12
Table of Contents
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1. Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
2.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.2 Mounting Location Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.3 Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.4 Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.5 Internal Grilles and diffusers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.6 Exterior Hoods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.7 Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.8 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3. Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
3.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3.2 Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3.3 Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.4 Remote Wall Control (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4. Airflow Measurements and Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Maintenance and Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.1 Bi-Monthly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2 Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6. Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
6.1 6LC, V6LC-12LC, V12LC Exhaust Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
6.2 6LC, V6LC-12LC, V12LC Recirculation Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
6.3 7000. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Appendix A - Mounting Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Appendix B - Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
Appendix C - Balancing Dampers Position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Appendix D - Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Appendix E - Terminal Control Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
Appendix F - Control Box Assembly 6LC, V6LC, 12LC and V12LC . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Appendix G - Make-up Heat Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Appendix H - Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-28
Appendix I - Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1. Safety Considerations
Hazards may exist within this equipment because it contains electrical and powerful moving components.
Only qualified service personnel should install or service this equipment. Untrained personnel can perform basic maintenance such as
maintaining filters.
Observe precautions marked in literature and on labels attached to unit. Follow all safety codes.
Disconnect main power switches to unit before performing service or maintenance. Electric shock can cause
personal injury or death.
WARNING
2
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, file 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 specific 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.
WARNING
It is recommended to wear safety glasses and gloves
while performing these instructions.
2.3 Mounting Options
There are several options for hanging or floor 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 floor 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
6LC, V6LC, 12LC, V12LC 14” x 8” (356 mm x 203 mm)
7000 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.
Air balancing dampers are recommended for both supply and
exhaust ducts to allow for adjustment of airflow. Also, flexible 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 6LC, V6LC, 12LC and V12LC units have 1” (25 mm)
flanges 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 flange for
this port only. For port locations see Appendix B.
All ports on the 7000 unit have 2” (51 mm) flanges to facilitate
the installation of the ductwork. Please note the “Fresh Air From
Outdoors” connection is factory set to be the left side upper port. It
is possible to reverse the operation of the defrost damper in order
to use the port on top of the cabinet for “Fresh Air From Outdoors”
connection.
To change the «Fresh Air From Outdoors» from the side to the top
use the following directions. For port locations see Appendix B.
Remove the cover of the damper motor with a flat screwdriver.
Reverse the ORANGE and RED wires by moving the ORANGE
from terminal no. 2 to terminal no. 3 and moving the RED wire from
terminal no. 3 to terminal no. 2. The end result in order to have the
“Fresh Air From Outdoors” connection to the top port will be: no. 1 WHITE, no. 2 - RED, no. 3 - ORANGE.
2.5 Internal Grilles and Diffusers
Locate exhaust grilles and supply diffusers to provide effective
ventilation and avoid short circuiting of airflows. 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 airflow
should not exceed 400 ft./min. (2 m/sec.) for normal applications.
The duct system should be designed according to the high speed
flow 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 of smooth radius
elbows or square elbows with turning vanes to achieve maximum
performance.
3
2. Installation (cont’d)
3. Controls
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 airflow 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 fittings 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 fitting 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:
6LC, V6LC 7000 12LC, V12LC
VO LTAGE 115 V115 V115 V
MCA 8.65 6.63 13.4
MOP 12.5 9.13 20
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.
S
PEED SELECTION (6LC, V6LC /12LC, V12LC UNITS ONLY)
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.
The 7000 unit is two speed. Low speed can be initiated by creating
a closure across LOW - COM or high speed can be initiated by
creating a closure across HIGH - COM.
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. For 6LC, V6LC, 12LC and V12LC units only, if
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. For 6LC, V6LC,
12LC and V12LC units only, if 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. For 6LC, V6LC, 12LC and V12LC units
only, if equipped with recirculation module, the internal defrost
damper opens recirculation opening.
• Power connected, FF control contacts close during unit ventilation
or defrost cycle.
4
3. Controls (cont’d)
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!
5. Maintenance and Service
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 - 6LC, V6LC, 12LC and V12LC units
only). In cold temperatures, defrost cycles will remove frost from the
heat recovery core to maintain good operation.
E
XHAUST 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.
WARNING
A negative building pressure may develop during the
defrost cycle with possible backdrafting fumes from
combustion equipment.
RECIRCULATION DEFROST MODULE
(OPTIONAL - FACTORY INSTALLED)
The Recirculation Defrost Module is only available with the 6LC,
V6LC, 12LC and V12LC units. 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 6LC, V6LC, 12LC and V12LC 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 two options are
available.
SLIDE SWITCH TYPE
Dehumidistat to engage high speed exchange. Slide switch operation
supporting continuous low exchange and continuous high exchange.
POOL ELECTRONIC TYPE (FOR 7000 UNIT ONLY)
Ideal for pool dehumidification. Dehumidistat to engage high speed
exchange. Push-button operation supporting: intermittent (stand-by)
ventilation, continuous low exchange, continuous high exchange,
maintenance indicator light and exchange indicator light.
4. Airflow Measurement and Balancing
Once installation is complete, the supply and exhaust airflows
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 flow 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.
5.1 Bi-Monthly Maintenance
WARNING
Disconnect power before maintaining unit.
Bi-monthly maintenance should include:
AIR FILTERS
The standard foam filters 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 efficiency filter for the supply air stream is available from
your supplier. This filter is disposable and should be replaced when
it becomes dirty.
VL0001
2
6LC, V6LC, 12LC and V12LC units
Washable foam filter
MEF filter - optional
1 or 2
1
VL0002A
7000 unit
DRAIN PANS AND INTERIOR OF UNIT
With the filters 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 fittings are
free from dirt and are draining freely.
5
1
1
5. Maintenance and Service (cont’d)
!
WARNING
Disconnect power before maintaining unit.
5.2 Annual Maintenance
Annual maintenance should include:
AIR FILTERS
Vacuum and wash standard foam filters. Replace medium efficiency
filter if present.
D
RAIN 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 fittings
to ensure they are draining freely.
H
EAT RECOVERY CORE
The heat 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 efficiency of the
partitions.
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.
Allow the heat recovery core to soak for three hours in warm water
and mild soap. Rinse under a heavy stream of water.
ERV HM CORE
CAUTION
Do not soak the ERV HM core in water. This core can
easely be damaged especially if it is soaked.
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.
M
OTOR 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 115 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.
REMOVE THESE
TWO SCREWS
LOCKING PLATE
CAPACITOR
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.
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 column for instructions on removing the blower assembly.
SYSTEM OPERATION CHECK
Verification 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.
7000 unit ONLY: Check for 24 volt output between the WHITE/RED
and the WHITE/ORANGE wires at the damper motor. If 24 volts
can be measured at the damper motor, the problem is either in the
connections, the defrost relay or the main circuit board.
6LC, V6LC/12LC, V12LC units ONLY: (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.
VD0004A
6LC, V6LC, 12LC and V12LC units
THUMBSCREW
SERVICE CONNECTOR
VD0001A
7000 unit
6
6.1 6LC, V6LC-12LC, V12LC Exhaust Defrost
G
H
6. Service parts
B
N
M
L
VL0068
Ref. Part No. Description
B
C
D
E
F
G
H
I
J
K
NOTE 1: C and D not available for ERV HM Core
13036 Hinge kit (male-female)
1808139 Core Defrost Actuator 6LC, V6LC-12LC, V12LC
63341
63327 Core Damper 6LC, V6LC
63328 Core Damper 12LC, V12LC
63329 Core Damper 12LC, V12LC, Powder Coated
201982 Fresh Air Damper 6LC, V6LC
63330 Fresh Air Damper 12LC, V12LC
63331
1808138 Fresh Air Damper Act. 6LC, V6LC-12LC, V12LC
63332
201805 Filter SWF 13.125" x 11.25" x 1" (unitary)
1808147 Core Poly CSA 6LC, V6LC-12LC, V12LC (unitary)
1808146
1604191 Core Aluminum 6LC, V6LC-12LC, V12LC (unitary)
1607787 ERV HM Core 6LC, V6LC-12LC, V12LC (unitary)
16035 Door Latch-Keeper Kit
1607456 Drain Fitting 6LC, V6LC, 12LC, V12LC, 7000 (unitary)
63342
Core Defrost Actuator 12LC, V12LC, Powder
Coated
Fresh Air Damper 12LC, V12LC Powder
Coated
Fresh Air Damper Actuator 12LC, V12LC
Powder Coated
Core Poly UL 6LC, V6LC-12LC, V12LC U.S.
only (unitary)
Filter Optional MEF 6LC, V6LC, 12LC, V12LC
(unitary)
C D
E
F
JK
I
Ref. Part No. Description
1808130 PCB Electronic 6LC, V6LC, 12LC, V12LC, 7000
202382 Thermistor 6LC, V6LC, 12LC, V12LC, 7000
L *
500025914
500025915
1808144 Blower Ass’y 6LC, V6LC
1808148 Blower Ass’y 12LC, V12LC
1808148P Blower Ass’y 12LC, V12LC Powder Coated Option
1808142 Blower Wheel 6LC, V6LC, 12LC, V12LC (not shown)
M
1808149 Fan Motor 6LC, V6LC (not shown)
1808150 Fan Motor 12LC, V12LC (not shown)
63110 Capacitor 5 F LC, 7000 (not shown)
208507
N
* 202798 Door Assembly 6LC, V6LC, 12LC, V12LC
* 63343
* 1808145 Accessories kit 6LC, V6LC, 12LC, V12LC
* 63344 Hanger Strap 18" Kit 6LC, V6LC,12LC, V12LC, 7000
* Not Shown.
NOTE 2: H 2 cores required for 6LC and V6LC units
3 cores required for 12LC and V12LC units
NOTE 3: G 4 filters for 6LC and V6LC units
6 filters for 12LC and V12LC units
NOTE 4: K 2 filters for 6LC and V6LC units
3 filters for 12LC and V12LC units
7
Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, 6LC, V6LC, 12LC, V12LC
Relay DPST 120 VAC, 1 HP,
30 A @ 120 VAC, 6LC, V6LC, 12LC, V12LC
Terminal Strip 10-Pin Molex 38721-6710,
6LC, V6LC, 12LC, V12LC
Door Assembly
(Powder Coated Option)
12LC , V12LC
6. Service parts (cont’d)
H
6.2 6LC, V6LC-12LC, V12LC Recirculation Defrost
B
C
M
L
K
J
VL0069
Ref. Part No. Description
B
C
D
E
F
G
H
I
* Not Shown.
NOTE 1: C 2 cores required for 6LC and V6LC units
3 cores required for 12LC and V12LC units
NOTE 2: D 4 filters for 6LC and V6LC units
6 filters for 12LC and V12LC units
13036 Hinge kit (male-female)
1808147 Core Poly CSA 6LC, V6LC-12LC, V12LC (unitary)
1808146
1604191 Core Aluminum 6LC, V6LC-12LC, V12LC (unitary)
1607787 ERV HM Core 6LC, V6LC-12LC, V12LC (unitary)
201805 Filter SWF 13.125" x 11.25" x 1" (unitary)
63333 Recirculation Damper 6LC, V6LC
63334 Recirculation Damper 12LC, V12LC
63335
225855
066161 Fuse Holder 6LC, V6LC, 12LC, V12LC, 7000
201603
63352
*
066176
500025914
64098 Transformer 120-24V 40VA
16035 Door Latch-Keeper Kit
1607456 Drain Fitting 6LC, V6LC, 12LC, V12LC, 7000 (unitary)
Core Poly UL 6LC, V6LC-12LC, V12LC U.S.
only (unitary)
Recirculation Damper 12LC, V12LC Powder
Coated
Damper Motor Belimo LMB24-3-T, 7000,
6LC, V6LC-12LC, V12LC (Recirc. Defrost Option)
Terminal Strip 3-Pin Molex 38721-6703 6LC,
V6LC, 12LC, V12LC (Recirculation Defrost)
Relay DPDT 24 VAC, 1/2 HP, 15 A @ 120 VAC,
6LC, V6LC, 12LC, V12LC (Recir. Defrost Option)
Fuse 0.25 A, 250 V Time Delay 1.25" MDL 6LC,
V6LC-12LC, V12LC (Recirc. Defrost Option)
Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, 6LC, V6LC, 12LC, V12LC
DE F
I
Ref. Part No. Description
J
K *
L
M
* Not Shown.
NOTE 3: J 2 filters for 6LC and V6LC units
3 filters for 12LC and V12LC units
63342
1808130 PCB Electronic 6LC, V6LC, 12LC, V12LC, 7000
202382 Thermistor 6LC, V6LC, 12LC, V12LC, 7000
500025914
500025915
1808144 Blower Ass’y 6LC, V6LC
1808148 Blower Ass’y 12LC, V12LC
1808148P Blower Ass’y 12LC, V12LC Powder Coated Option
1808142
1808149 Fan Motor 6LC, V6LC (not shown)
1808150 Fan Motor 12LC, V12LC (not shown)
63110 Capacitor 5 F LC, 7000 (not shown)
208507
* 202798 Door Assembly 6LC, V6LC, 12LC, V12LC
* 63343
* 1808145 Accessories kit 6LC, V6LC, 12LC, V12LC
* 63344 Hanger Strap 18" Kit 6LC, V6LC, 12LC, V12LC, 7000
* 64228 Backdraft damper 6LC, V6LC recirculation
* 64229 Backdraft damper 12LC, V12LC recirculation
D
Filter Optional MEF 6LC, V6LC, 12LC, V12LC
(unitary)
Relay SPDT 120 VAC, 1 HP,
30 A @ 120 VAC, 6LC, V6LC, 12LC, V12LC
Relay DPST 120 VAC, 1 HP,
30 A @ 120 VAC, 6LC, V6LC, 12LC, V12LC
Blower Wheel 6LC, V6LC, 12LC, V12LC (not
shown)
Terminal Strip 10-Pin Molex 38721-6710,
6LC, V6LC, 12LC, V12LC
Door Assembly
(Powder Coated Option)
G
12LC, V12LC
8
6.3 7000
E
F
G
H
6. Service parts (cont’d)
B
DC
L
K
VL0070
Ref. Part No. Description
B
C
D
E
F
G *
16035 Door Latch-Keeper kit
Damper Motor Belimo LMB24-3-T, 7000,
225855
1604178 Fresh Air Damper
1604168 Blower Ass’y 7000
1604177 Blower Wheel (not shown)
1604169 Fan Motor 7000 (not shown)
63110 Capacitor 5 F LC, 7000 (not shown)
202790
1808130 PCB Electronic 6LC, V6LC, 12LC, V12LC, 7000
202382 Thermistor 6LC, V6LC, 12LC, V12LC, 7000
63117 Transformer 7000
63345
066161 Fuse Holder 6LC, V6LC, 12LC, V12LC, 7000
066169
6LC, V6LC-12LC, V12LC (Recirculation
Defrost Option)
Terminal Strip 7-Pin Molex 38721-6707,
7000
Relay DPDT 120 VAC, 1/2 HP, 15 A @ 120 VAC,
7000, 6LC, V6LC, 12LC, V12LC
Fuse 0.5 A, 250 V Time Delay 1.25" MDL
7000
J
I
Ref. Part No. Description
H
I
J
K
L
* 1608701 Optional MEF Filter 7000 Supply (unitary)
* 1804103P Door Ass’y 7000 (Powder Coated option)
* 027123 Anti-vibration Bushing 7000 (unitary)
* 63344
* Not Shown.
13036 Hinge Kit (male-female)
1604156 Core Poly CSA 7000
1604190 Core Poly UL 7000 U.S. only
1607456
134147
134145
Drain Fitting 6LC, V6LC, 12LC, V12LC,
7000 (unitary)
Filter SWF 18.6" x 15.6" x 1" 7000 Exhaust
(unitary)
Filter SWF 19" x 22.75" x 1" 7000 Supply
(unitary)
Hanger Strap 18" Kit 6LC, V6LC, 12LC,
V12LC, 7000
9
Reinforced
Rubber Strap
Appendix A
MOUNTING DIAGRAMS
6LC, V6LC, 12LC AND V12LC UNITS
Recirculation Module
(Factory Installed)
U Channel
(Supplied by others)
Diagrams show standard unit configuration.
NOTE:
For units with the reversed door option, the
door will be located here.
Recirculation Module
(Factory Installed)
3/8" (10mm)
Threaded Rod
(Supplied by others)
Recirculation Module
(Factory Installed)
Bolt to Floor
Space must be left to allow connection
of drain lines with adequate slope for drainage
VD0002A
3/8" (10mm)
Threaded Rod
(Supplied by others)
Rubber Vibration Isolator
(Supplied by others)
Wooden Curb (Supplied by others)
7000 UNIT
Dry
VD0003A
Contacts
Rubber Vibration
Isolater
Cabinet Mounted
U Channel
10
Dry
Contacts
Bolt to Floor
Wooden Curb
(Supplied by others)
Space must be left to allow
connection of drain lines with
adequate slope for drainage
Appendix B
UNIT DIMENSIONS
B-1: 6LC AND V6LC (WITHOUT RECIRCULATION MODULE)
Kg
18.88
12.27
25.12
16.33
72.60
LB.
40.80
26.52
54.30
35.31
156.96
6 LC ERV HM CORE
B
D
A
C
PTS
6 LC ALUMINUM CORE
Direction of airflow
6 LC POLY CORE
Center of gravity
NOTES:
Dimensions in [ ] are in millimeters
Kg
LB.
PTS
Kg
LB.
PTS
20.00
44.21
A
17.45
38.49
A
13.00
28.67
B
11. 32
24.96
B
26.72
58.92
D
C
23.26
51.29
C
TOTAL
17.30
38.21
15.08
33.26
D
B
A
[305]
12.005"
77.11
170.00
TOTAL
67.13
148.00
TOTAL
3/4" NPT
CONNECTION SIZES
CONNECTION TABLE
14 Gauge wire nut
Condensate drain fitting (2x)
A
B
D
[340]
13.375"
C
[597]
23.500"
[165]
6.500"
[356]
14.000"
[203]
8.000"
OPENING
OUTDOOR AIR
[203]
8.000"
OPENING
RETURN AIR
[358]
14.103"
RIGHT SIDE
[70]
2.750"
[102]
4.000"
LOCATION
STRAP MOUNTING
[864]
TOP
34.000"
[622]
24.500"
OUTDOOR AIR
RETURN AIR
[196]
7.705"
DRAIN LINE FITTING
[130]
5.125"
FRONT
[488]
19.207"
NOTE: FOR UNITS WITH THE REVERSED DOOR OPTION,
INTERIOR COMPONENTS WILL APPEAR AS A MIRROR
IMAGE OF THE ABOVE DIAGRAM.
A MINIMUM OF 15.000" [381] 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" [51] OF CLEARANCE.
CORE
REVERSED DOOR OPTION
[381]
15.000"
A
[149]
5.859"
[711]
28.005"
4.000"
LINE POWER
4.028"
[356]
14.000"
[102]
[102]
EXHAUST AIR
EXHAUST AIR
[203]
8.000"
OPENING
[102]
4.000"
SUPPLY AIR
LOW VOLTAGE
TERMINAL STRIPS
[203]
8.000"
11
OPENING
SUPPLY AIR
CONTROL BOX
ACCESS
10.005"
3.535"
[254]
B
[90]
OPTION
REVERSE DOOR
LEFT SIDE
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.
A MINIMUM OF 12.000" [305] CLEARANCE FROM ANY OBSTRUCTION
IS REQUIRED FOR REMOVAL OF CONTROL BOX.
ACCESS DOOR
CONTROL PLATE
[305]
12.000"
VK0104A
Appendix B (cont’d)
UNIT DIMENSIONS
B-2: 6LC AND V6LC WITH RECIRCULATION MODULE (FACTORY INSTALLED)
Kg
95
206
6 LC ERV HM CORE
PTS LB.
with recirculation module
TOTAL
Kg
[180]
7.10"
LB.
231 105
[356]
6 LC ALUMINUM CORE
14.00"
with recirculation module
PTS
TOTAL
Kg
90
[203]
8.00"
Fresh Air
From Outside
[102]
4.00"
8.00"
Exhaust Air
From Building
[203]
[44]
1.75"
[358]
14.10"
NOTE: Dimensions in [ ] are millimetres.
LB.
197
6 LC POLY CORE
PTS
with recirculation module
TOTAL
Location
Strap Mounting
49.550" [1259]
Drain Fitting
Access Door
5.125" [130]
19.207" [488]
NOTE:
For units with the reversed door option, interior components will appear
Reversed Door Option
[381]
15.00"
A minimum of 15.00" [381] 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" [51] of clearance.
Access Door
as a mirror image of the above diagram.
Core
Line Power
2.75" [70]
28.12" [714]
14.00" [356]
1.75" [44]
4.00" [102]
Exhaust Air
[203]
8.00"
To Outside
Dry Contacts
[102]
4.00"
[622]
24.50"
8.00"
Fresh Air
To Building
[203]
[90]
3.53"
Control Box
Reverse Door Option
12
A minimum of 12.00" [305] clearance from any obstruction
is required for removal of control box.
Control Plate
[305]
12.00"
VK0090A
B-3: 12LC AND V12LC (WITHOUT RECIRCULATION MODULE)
Kg
26.84
19.35
26.88
LB.
57.84
41.68
57.92
12 LC ERV HM CORE
A
B
C
PTS
Kg
27.40
19.77
27.40
LB.
60.41
43.59
60.41
A
B
C
PTS
12 LC ALUMINUM CORE
Kg
24.50
17.68
24.50
LB.
54.02
38.98
54.02
Direction of airflow
Center of gravity
NOTES:
Dimensions in [ ] are in millimeters
12 LC POLY CORE
PTS
A
B
C
19.34
41.68
D
19.77
43.59
D
17.68
38.98
D
92.41
199.12
TOTAL
94.34
208.00
TOTAL
84.36
186.00
TOTAL
Appendix B (cont’d)
3/4" mpt
CONNECTION SIZES
CONNECTION TABLE
14 GAUGE WIRE NUT
CONDENSATE DRAIN FITTING (2X)
A
B
UNIT DIMENSIONS
[622]
24.500"
8.000"
EXHAUST AIR
4.000"
[203]
FROM BUILDING
[102]
[251]
9.878"
[508]
20.000"
[279]
11.000"
STRAP MOUNT
LOCATION
[203]
8.000"
FRESH AIR
FROM OUTSIDE
[70]
2.750"
[508]
20.000"
DRAIN FITTING
ACCESS DOOR
RIGHT SIDE
REVERSED DOOR OPTION
[381]
15.000"
[102]
RETURN AIR
SUPPLY AIR
LOW VOLTAGE
TERMINAL STRIPS
[130]
5.125"
[488]
19.207"
NOTE: FOR UNITS WITH THE REVERSED DOOR OPTION,
INTERIOR COMPONENTS WILL APPEAR AS A MIRROR
IMAGE OF THE ABOVE DIAGRAM.
CONTROL BOX
ACCESS
[288]
11.325"
FRONT VIEW
A MINIMUM OF 15.000" [381] 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" [51] OF CLEARANCE.
ACCESS DOOR
A MINIMUM OF 12.000" [305] CLEARANCE FROM ANY OBSTRUCTION
IS REQUIRED FOR REMOVAL OF CONTROL BOX.
CORE
[305]
12.000"
OUTDOOR AIR
B
A
[524]
20.620"
D
[864]
34.000"
TOP
[362]
14.250"
C
EXHAUST AIR
LINE POWER
A
[145]
5.715"
4.028"
[1047]
41.206"
[1024]
40.326"
[508]
20.000"
[254]
10.000"
8.000"
13
TO OUTSIDE
EXHAUST AIR
[203]
4.000"
[102]
FRESH AIR
TO BUILDING
B
LEFT SIDE
OPTION
REVERSE DOOR
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.
CONTROL COVER
VK0106A
Appendix B (cont’d)
UNIT DIMENSIONS
B-4: 12LC AND V12LC WITH RECIRCULATION MODULE (FACTORY INSTALLED)
Kg
120
LB.
260
PTS
12 LC ERV HM CORE
with recirculation module
Kg
LB.
12 LC ALUMINUM CORE
with recirculation module
PTS
Kg
LB.
12 LC POLY CORE
PTS
with recirculation module
NOTE: Dimensions in [ ] are millimetres.
TOTAL
269 122
TOTAL
112
247
TOTAL
[254]
10.000"
[508]
20.000"
Location
Strap Mounting
[203]
8.00"
Fresh Air
From Outside
4.00"
[102]
8.00"
Exhaust Air
[203]
From Building
[44]
1.75"
20.000"
Access Door
[508]
Drain Fitting
Reversed Door Option
49.550" [1259]
2.75" [70]
[508]
20.00"
41.24" [1047]
Line Power
Dry Contacts
To Outside
Exhaust Air
Fresh Air
To Building
5.125" [130]
[488]
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 15.00" [381] clearance from any obstruction is required for removal
A minimum of 12.00" [305] clearance from any obstruction
of heat recovery cores, fans, etc.
is required for removal of control box.
The access door can be removed from cabinet with only 2.00" [51] of clearance.
Access Door
Heat Recovery Core
15.00"
[305]
12.00"
[381]
[254]
10.00"
8.00"
[44]
1.75"
[203]
4.00"
24.50"
[102]
[622]
8.00"
[203]
[90]
3.53"
Reversed Door Option
14
Control Cover
VK0107A
3/4" NPT
CONNECTION SIZES
Appendix B (cont’d)
UNIT DIMENSIONS
B-5: 7000
[48]
[203]
1.875"
8.000"
[273]
10.750"
7.500"
8.000" [203]
[191]
[527]
Condensate drain fitting (2x)
B
[1194]
47.000"
20.750"
DEFROST AIR
[203]
8.000"
2.000"
OPENING
CONNECTION TABLE
7000
LB. Kg
32.74 14.85
68.46 31.05
35.20 15.97
73.60 33.38
A
B
[254]
10.000"
210.00
C
D
TOTAL 95.25
[572]
22.500"
14 gauge wire nut
A
Center of gravity
Direction of airflow
NOTES:
Dimensions in [ ] are in millimeters
PTS
TOP
AB
CD
[51]
OPENING
EXHAUST AIR
A
2.157"
Line Voltage In
[940]
37.000"
EXHAUST
AIR
[55]
SUPPLY AIR
SUPPLY
OPENING
12.104"
AIR
[307]
[269]
10.605"
Low Voltage
Terminal Strips
[628]
24.736"
A minimum of 12.00" [305] clearance from any
obstruction is required for power hook-up, low
[789]
31.080"
51.000"
voltage remote connection, and control panel access.
[1295]
RIGHT SIDEFRONT
A minimum of 21.00" [533] 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" [51] of clearance.
[533]
21.000"
HEAT RECOVERY CORE
ACCESS DOOR
[356]
14.000"
[92]
3.625"
[51]
2.000"
[48]
1.875"
[95]
3.750"
OUTDOOR AIR
AIR
OPENING
OUTDOOR
[203]
8.000"
[51]
2.000"
[311]
12.250"
40.500"
15
RETURN AIR
8.000"
[1029]
RETURN AIR
OPENING
[203]
B
[387]
15.250"
CONDENSATE DRAIN
LEFT SIDE
VK0093A
Gravity Backdraft Damper
(for recirculation
defrost option only)
Exhaust Air
to Outdoors
Fresh Air
to Building
VJ0135A
Balancing
Damper
Appendix C
BALANCING DAMPERS POSITION
6LC, V6LC, 12LC AND V12LC
Min.12" (305 mm)
Canvas Vibration Isolator
Reverse Door Option
Min. 8" (203 mm)
(Optional) Canvas Vibration Isolator
Fresh Air
From Outdoors
Exhaust Air
From Building
VJ0123A
7000
Balancing Damper
(not supplied)
Canvas Vibration Isolator
Dry Contacts
16
Appendix D
DRAIN CONNECTIONS
6LC, V6LC, 12LC AND V12LC
Plastic drain fitting
Min. 3”
[76 mm]
Min. 1”
[25 mm]
NOTES:
1. All hose, pipe and couplers to be supplied by others.
2. Slope drain lines minimum 1/4” per foot.
VO0002A
To drain
3/4” NPT
coupler
Min. 4”
[102 mm]
Plastic hose
7000
Water trap
Min. 3”
[76 mm]
Min. 1”
[25 mm]
Min. 4”
[102 mm]
Copper or
plastic pipe
To drain
Min. 3”
[76 mm]
Min. 1”
[25 mm]
To drain
NOTES:
1. All hose, pipe and couplers to be supplied by others.
2. Slope drain lines minimum 1/4” per foot.
VO0001A
3/4” NPT
coupler
Min. 4”
[102 mm]
Water trap
Plastic hose
Plastic drain fitting
Min. 3”
[76 mm]
Min. 1”
[25 mm]
17
Min. 4”
[102 mm]
Copper or
plastic pipe
To drain
Appendix E
TERMINAL CONTROL DIAGRAMS
E-1: TERMINAL LABEL
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 7000 unit). All field 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 VO LTAGE 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.
E-2: WALL CONTROL CONNECTION
Two types of remote wall controls are available:
1. Slide Switch Wall Control with fan switch and dehumidistat
control (for 6LC, V6LC, 12LC and V12LC units)
2. Pool Plus Wall Control with fan mode selection, dehumidistat
control and high speed recirculation mode (for 7000 unit).
The remote wall controls work with the microprocessor electronic
control within the unit to control ventilation sequences. Each wall
control has different features and require 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.
VE0002A
WALL CONTROL
Black
Red
OCCUPIED
TIMER/
SENSOR
F
F
CLASS 2 VOLTAGE
NOTE:
Connections are all dry
contacts except wall control
and 24VAC power supply.
Use of 24VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Green
Yellow
LOW
COMMON
HIGH
18
JUMPER
VE0006A
WALL CONTROL
Black
Red
OCCUPIED
TIMER/
SENSOR
F
F
CLASS 2 VOLTAGE
NOTE:
Connections are all dry
contacts except wall
control
and 24VAC power supply.
Use of 24VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Green
Yellow
LOW
COMMON
HIGH
Wall
Control
Appendix E (cont’d)
TERMINAL CONTROL DIAGRAMS
E-3: OCCUPIED TIMER/SENSOR CONNECTION
(NOT SOLD BY VENMAR OR
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).
JUMPER
(factory installed)
WALL CONTROL
Black
Red
OCCUPIED
TIMER/
JUMPER
SENSOR
F
F
CLASS 2 VOLTAGE
NOTE:
Connections are all dry
contacts except wall
control and 24VAC power
supply.
Use of 24VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
VE0314A
Green
Yellow
LOW
COMMON
HIGH
NSB Timer
1M2345
24 (-) VAC
24 (+) VAC
VÄN EE)
OCC. CONTROL
(field installed)
WALL CONTROL
Black
Red
OCCUPIED
TIMER/
SENSOR
F
F
CLASS 2 VOLTAGE
NOTE:
Connections are all dry
contacts except wall
control and 24VAC power
supply.
Use of 24VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
Green
Yellow
LOW
COMMON
HIGH
E-4: REMOTE FAN CONTROL
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,
CO
sensor, light sensor, timer, building management system, etc.,
2
supplied by others.
The illustration below represents a switch connected to the unit.
JUMPER
VE0005A
WALL CONTROL
Black
Red
OCCUPIED
TIMER/
SENSOR
F
F
CLASS 2 VOLTAGE
NOTE:
Connections are all dry
contacts except wall control
and 24VAC power supply.
Use of 24VAC circuit
requires isolating contacts
(ex. thermostat) to prevent
interconnection of Class 2
outputs.
LOW
COMMON
HIGH
Green
Yellow
FAN
REMOTE
SWITCH
LOW HIGH
CONTROL BOX ASSEMBLY 6LC, V6LC, 12LC AND V12LC
VE0001A
Appendix F
Remote control access plate
Remote wiring terminal block
Control box
Unit cabinet
Control cover plate
19
Appendix G
MAKE-UP HEAT REQUIREMENTS
6LC, V6LC AND 7000 12LC AND V12LC
73°F
(23°C)
68°F
(20°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C
73°F
(23°C)
68°F
(20°C)
kW kW kW kW kW kW kW kW kW kW kW kW kW kW kW
55°F
Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature
Supply
(13°C)
Air
(L/s)
Outdoor Air -40°F (-40°C) Outdoor Air -22°F (-30°C) Outdoor Air -4°F (-20°C) Outdoor Air 14°F (-10°C) Outdoor Air 32°F (0°C)
55°F
(13°C)
73°F
(23°C)
68°F
(20°C)
55°F
(13°C
73°F
(23°C)
68°F
(20°C)
kW kW kW kW kW kW kW kW kW kW kW kW kW kW kW
55°F
Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature
Supply
(13°C)
Air
(L/s)
Outdoor Air -40°F (-40°C) Outdoor Air -22°F (-30°C) Outdoor Air -4°F (-20°C) Outdoor Air 14°F (-10°C) Outdoor Air 32°F (0°C)
UNITS
and 7000
6LC, V6LC
Although the 6LC, V6LC, 7000, 12LC and V12LC models have good efficiencies, 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 airflows.
NOTE:
The data does not reflect 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
Air
Supply
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
(CFM)
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
20
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
12LC and
Air
V12LC UNITS
(CFM)
Supply
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
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
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
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
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
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
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
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
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
VE0338A
EXT.
BK
1 1
W
2 2
GL1004
G
from 1030
CORE DAMPER
NOTE B
from 1022
EXHAUST
NOTE B
from 1012
120 VAC
from 1002
INTAKE
6LC, V6LC,12LC & V12LC - Exhaust Defrost - Normal Low Speed
MAIN
POWER
PJ1001
BK
from 1013
NEUT
BK
BK
from 1022
EXHAUST NOTE B
BK
BK
W
CR1026
4 2
HIGH SPEED
CR1029
COM NC
DEFROST
CR1024
4 2
LOW SPEED
NOTE A
CR1026
8 6
HIGH
SPEED
CR1024
8 6
LOW
SPEED
NOTE A
to 1020, 2016
120 VAC
to 1002, 1021
NEUT
NOTE A: THE MEDIUM SPEED WIRES MAY OPTIONNALLY
REPLACE THE LOW SPEED (RED) WIRES
RUNNING FROM RELAY LOW SPEED.
NOTE B: N
FIELD WIRING (USE COPPER CONDUCTORS ONLY)
UNIT ASSEMBLY (NOT ON CONTROL PANEL)
TB2002
BK
BLACK
PJ2003 PJ2003
R
2 2
GN
GN
BL
BL
BK/R
W/R
BK
W
4 4
6 6
5 5
PJ2003
PJ2003
PJ2003
to 1027
TRANSMIT
to 1028
RECEIVE
to 1022
REMOTE FAN
to 1021
INTERLOCK
PJ2013 PJ2013A
2 2 2 2
1 1 1 1
PJ2016 PJ2016A
2 2 2 2
1 1 1 1
RED
OCC.
UNOCC.
REM FAN
INTERLOC
PJ1001A
BK/Y
BL
BK/Y
BL
BK/Y
4 4 4 4
W
R
W/R
R
OT AVAILABLE FOR HM CORE.
W
1 1 1 1
to 2017
INTAKE
R
2 2 2 2
BL BL
3 3 3 3
PJ1007
BK/Y
4 4 4 4
W/R
1 1 1 1
R
2 2 2 2
BL BL
3 3 3 3
3 3
to 1026
12 VDC
1 1
PJ2003
R2004
to 1029
LOGIC GND
Appendix H
WIRING DIAGRAMS
BK
CAP1001
5 µF
BK
BK
BN
BN
HIGH
MOT1002
COM
SUPPLY
GND
LOW
BLOWER
MED
GN
BK
CAP1007
5 µF
BK
BK
BN
BN
HIGH
MOT1008
COM
EXHAUST
GND
LOW
BLOWER
MED
GN
ACT2013
CORE
ACTUATOR
ACT2016
INTAKE
ACTUATOR
JUMPER SETTINGS
FOR CONTROL BOARD
JU1
JU1
JU1
JU1
JU1
JU1
JU1
A
B
C
D
E
F
G
3.9 K
PJ1001B
W
R
PJ1007A
W
R
TB2002A
GN
Y
BK
GREEN
YELLOW
LOW
COM
HIGH
2
1
2
1
21
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
from 2008
INTERLOCK
from 2007
REMOTE FAN
from 2003
12 VDC
from 2003
TRANSMIT
from 2005
RECEIVE
from 2007
LOGIC GND
THERMISTOR
10K OHMS
BK
BK/R
BK/Y
BL
BN
GN
O
TAG S
CR1029
CR1024
CR1026
UCB1021
OFF
OFF
OFF
ON
ON
ON
ON
SN1030
DEFROST
BLACK
BLACK/RED
BLACK/YELLOW
BLUE
BROWN
GREEN
ORANGE
BL
BL
Y
R
GN
BK
BK
BL
1
BL
BK
2
COLOR CODE
CONTROL BOX BOM
QTY.
DESCRIPTION
ELAY SPDT 120 VAC 1 HP 30 A @ 120 VAC
1
R
R
2
ELAY DPST 120 VAC 1 HP 30 A @ 120 VAC
1
PC BOARD
CONTROL
BOARD
UCB1021
F
F
I
OC
J3
OL
Y
R
G
B
1
J4
2
COM
J1
N/O
J2
N/C
1
2
3
4
5
6
7
8
9
R
W
W/BL
W/R
W/Y
Y
from 1012
120 VAC
BK
W
W/R
CR1024
R
0 1
W/Y
CR1026
O
0 1
W/BL
CR1029
BK/R
to 2013
CORE DAMPER
NOTE B
RED
WHITE
WHITE/BLUE
WHITE/RED
WHITE/YELLOW
YELLOW
from 1013
NEUT
to 1008, 2014
EXHAUST
NOTE B
LOW SPEED
NO 1003, 1009
NC
HIGH SPEED
NO 1001, 1007
NC
DEFROST
NO
NC 1002
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
VE0340A
EXT.
BK
W
GL1004
G
1 1
2 2
6LC, V6LC, 12LC & V12LC - Recirculation Defrost - Normal Low Speed
PJ1027
CR1026
4 2
HIGH SPEED
NEUT
CR1024
4 2
LOW SPEED
CR1026
8 6
HIGH SPEED
CR1029
COM NC
DEFROST
CR1024
8 6
LOW
SPEED
5 5
to 1027
TRANSMIT
to 1028
RECEIVE
to 1022
REMOTE FAN
to 1021
INTERLOCK
BK/Y
BK/Y
W
R
BL
NOTE A
BK/Y
W/R
R
BL
NOTE A
PJ1027
to 1020
120 VAC
to 1002, 1021
NEUT
2 2
to 2029
SUPPLY ON
PJ1001A
4 4 4 4
1 1 1 1
2 2 2 2
3 3 3 3
PJ1007
4 4 4 4
1 1 1 1
2 2 2 2
3 3 3 3
PJ1001B
BK/Y
WW
BL
PJ1007A
BK/Y
W/R
R
BL BL
BK
to 2026
ADDER 120 VAC
3 3
to 1026
12 VDC
1 1
PJ2003
R2004
3.9 K
to 1029
LOGIC GND
MAIN
POWER
PJ1001
BK
BK
from 1013
BK R R
BK
from 1022
EXHAUST
BK
BK
BK
W
NOTE A: THE MEDIUM SPEED WIRES MAY OPTIONNALLY
REPLACE THE LOW SPEED (RED) WIRES
RUNNING FROM RELAY LOW SPEED.
FIELD WIRING (USE COPPER CONDUCTORS ONLY)
UNIT ASSEMBLY (NOT ON CONTROL PANEL)
TB2002
BK
BLACK
PJ2003 PJ2003
R
2 2
RED
GN
OCC.
PJ2003
GN
4 4
UNOCC.
PJ2003
BL
6 6
REM FAN
INTERLOC
PJ2003
BL
5 5
Appendix H (cont’d)
WIRING DIAGRAMS
BK
BL
W
R
TB2002A
GN
Y
BK
GREEN
YELLOW
LOW
COM
HIGH
CAP1001
5 µF
BK
BK
BN
BN
HIGH
COM
GND
LOW
MED
GN/Y
BK
CAP1007
5 µF
BK
BK
BN
BN
HIGH
COM
GND
LOW
MED
GN/Y
MOT1002
SUPPLY
BLOWER
GN
MOT1008
EXHAUST
BLOWER
GN
1020
1021
INTERLOCK
1022
REMOTE FAN
1023
1024
1025
1026
from 2003
1027
from 2003
TRANSMIT
1028
from 2005
RECEIVE
1029
from 2007
LOGIC GND
1030
1031
1032
1033
2020
2021
2022
from 1030
DEFROST SIGNAL
2023
2024
2025
ADDER COMMON
2026
ADDER 120 VAC
2027
2028
2029
from 1000
SUPPLY ON
2030
2031
from 1024
LOW LOCKOUT
2032
LOW LOCKOUT
2033
from 2008
from 2007
12 VDC
DEFROST
THERMISTOR
10K OHMS
BK
BK/R
BK/Y
BL
BN
GN
GN/Y
BK/R
3 3
1 1
W/BL
4 4
from 1027
5 5
from 1011
6 6
BK/Y
2 2
1 1
2 2
to 1023
BL
BL
Y
R
GN
BK
SN1030
1
2
BLACK
BLACK/RED
BLACK/YELLOW
BLUE
BROWN
GREEN
GREEN/YELLOW
PJ2026
PJ2031
BK
BK
BK/R
W/BL
W/BL
FU2026
BK
BK
CR2028
5 3
UNOCCUPIED
HIGH
BK/Y
CR2028
R
6 2
UNOCCUPIED
HIGH
R
F
F
I
OC
OL
Y
R
G
B
BL
1
BL
2
COLOR CODE
CR2022
BK
XF2025
BK
0.25
CONTROLS
TRANSFORMER
CONTROL
BOARD
UCB1021
1
2
3
R
4
J3
J4
COM
J1
N/O
J2
N/C
5
6
7
8
9
LOW LOCKOUT
O
R
W
W/BL
W/R
W/Y
Y
RECIRC DAMPER BOX
W/BL
DEFROST 2
NO 2033
NC 2032
W/BL
40 VA
R
X2X1
H2
W
H1
CR2022
R
COM NC
DEFROST 2
CR2022
R
COM NO
DEFROST 2
from 1012
120 VAC
BK
W/R
PJ1024
2 2
from 2031
O
W/BL
W/BL
BK/R
BK/R
ORANGE
RED
WHITE
WHITE/BLUE
WHITE/RED
WHITE/YELLOW
YELLOW
W
R
PJ1024
R
W
R
BL
BL
W
R
O
1 1
W/Y
TB2023
CR2028
CR1024
R
CR1026
CR1029
7 8
from 1013
NEUT
to 1008
EXHAUST
to 2032
LOW LOCKOUT
0 1
0 1
W/Y
PJ1027
4 4
to 2025
ADDER COMMON
PJ1027
3 3
to 2022
DEFROST SIGNAL
C
R
G
W
UNOCCUPIED
HIGH
NO 2028
NC 2031
ACT2031
1
NOTE: REVERSE DOOR
2
ACCESS, SWAP
WIRES ON
TERMINALS 2
3
AND 3.
LOW SPEED
NO 1003, 1009
NC
HIGH SPEED
NO 1001, 1007
NC
DEFROST
NO
NC 1008
22
JUMPER SETTINGS
FOR CONTROL BOARD
JU1
JU1
JU1
JU1
JU1
JU1
JU1
A
B
C
D
E
F
G
OFF
OFF
OFF
ON
ON
ON
ON
TA GS
CR1029
CR2022
CR1024
CR1026
CR2028
FU2026
UCB1021
XF2025
QTY.
2
2
1
1
1
1
DESCRIPTION
R
ELAY SPDT 120 VAC 1 HP 30 A @ 120 VAC
RELAY DPST 120 VAC 1 HP 30 A @ 120 VAC
R
ELAY DPDT 24 VAC 1/2 HP 15 A @ 120 VAC
F
USE 0.25 A AND FUSE HOLDER MINI
PC BOARD
TRANSFORMER
CONTROL BOX BOM
UNIT CONTROL BOX ADDER CONTROL BOX
6LC, V6LC, 12LC & V12LC - Recirculation Defrost - Normal Low Speed (cont’d)
Appendix H (cont’d)
WIRING DIAGRAMS
NOTE: Written numbers on
CR2028 relay may differ from
the ones shown, but the relay
orientation must be the same
as illustrated.
23
Appendix H (cont’d)
WIRING DIAGRAMS
7000 - Recirculation Defrost
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
USE COPPER
CONDUCTORS
ONLY
SPLITTER BLOCK
TB1001
L1
L1
LINE SIDE
N
LOAD SIDE
GDNGD
BK
BK
to 1020, 2023
120 VAC
W
to 1022, 2024
NEUT
GN
from 1024
LOW SPEED
from 1021
EXHAUST COM
from 1026
HIGH SPEED
LOW SPEED
SUPPLY LOW
HIGH SPEED
R
W/BL
BK/Y
from 1024
from 1025
from 1026
PJ1007
CR1029
9 1
DEFROST 1
CR1029
12 4
DEFROST 1
GN
W/Y
BK/Y
GN
1 1
2 2
3 3
4 4
R
W/BL
BK/Y
GN
R
PJ1001
1 1
2 2
3 3
4 4
PJ1007A
1 1
2 2
3 3
4 4
W
BK
GN/Y
W/BL
BK/Y
GN/Y
R
BN/W
LOW
COM
HIGH
GND
BK
R
BN/W
LOW
COM
HIGH
GND
FIELD WIRING
UNIT ASSEMBLY (NOT ON CONTROL PANEL)
CAP1001
5 µF
BK
BN
MOT1002
SUPPLY
BLOWER
CAP1007
5 µF
BK
BN
MOT1008
EXHAUST
BLOWER
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
from 2008
INTERLOCK
from 2007
REMOTE FAN
from 2003
12 VDC
from 2003
TRANSMIT
from 2005
RECEIVE
from 2007
LOGIC GND
THERMISTOR
DEFROST
10K OHMS
BK
BK/R
BK/Y
BL
BN/W
GN
GN/Y
BL
BL
Y
R
GN
BK
SN1030
BK
1
BL
BK
2
BLACK
BLACK/RED
BLACK/YELLOW
BLUE
BROWN/WHITE
GREEN
GREEN/YELLOW
BL
CONTROL
BOARD
UCB1021
1
F
2
F
3
I
OC
4
J3
5
OL
J1
Y
6
7
R
8
G
9
B
1
N/O
J4
2
N/C
J2
COM
COLOR CODE
O
R
W
W/BL
W/R
W/Y
Y
from 1001
120 VAC
BK
W
R
W/Y
BK/Y
W/R
BK/R
W/BL
to 1008
EXHAUST COM
from 1002
NEUT
to 1001, 1007
LOW SPEED
to 1002
SUPPLY COM
to 1003, 1009
HIGH SPEED
CR1029
13 14
DEFROST 1
NO
CR1030
NC 1008, 1009
13 14
DEFROST 2
NO 2023
NC 2024
ORANGE
RED
WHITE
WHITE/BLUE
WHITE/RED
WHITE/YELLOW
YELLOW
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
VE0344A
TB2002
BLACK
RED
OCC.
UNOCC.
REM FAN
INTERLOC
BK
R
GN
GN
BL
BL
to 1027
TRANSMIT
to 1028
RECEIVE
to 1022
REMOTE FAN
to 1021
INTERLOCK
to 1026
12 VDC
R2004
3.9 K
to 1029
LOGIC GND
TB2002A
GN
Y
BK
GN
BK
GREEN
YELLOW
LOW
COM
HIGH
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
from 1001
120 VAC
from 1002
NEUT
FU2023
BK BK
0.5
WBK
TRANSFORMER
XF2024
40 VA
H2
H1
CONTROLS
CR1030
BL
BL
BL
9 5
DEFROST 2
CR1030
9 1
DEFROST 2
X2X1
O
BK/R
W/R
3 3
2 2
1 1
PJ2023A
O
BK/R
W/R
3
ACT2023
SUPPLY DAMPER
2
1
24
Appendix H (cont’d)
WIRING DIAGRAMS
7000 - Recirculation Defrost (cont’d)
CONTROL BOX BOM
1
4
1
5
8
9
12
13
14
4
5
8
9
12
13
14
TAG S
CR1029
CR1030
FU2023
UCB1021
XF2024
R2004
SN1030
TB1001
NOTE: Written numbers on CR1029 and
CR1030 relays may differ from the ones
shown, but the orientation of the relays
must be the same as illustrated.
QTY.
DESCRIPTION
ELAY DPDT 120 VAC 1/2 HP
R
2
15 A @ 120 VAC
USE 0.5 A AND FUSE HOLDER
F
1
FLUSH
PC BOARD
1
1
TRANSFORMER
1
RESISTOR 3.9K
HERMISTOR 10K OHMS
1
T
SPLITTER BLOCK
1
JUMPER SETTINGS
FOR CONTROL BOARD
JU1
JU1
JU1
JU1
JU1
JU1
JU1
A
B
C
D
E
F
G
MOUNT
ON
OFF
OFF
ON
ON
ON
ON
VE0345A
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Appendix I
TROUBLESHOOTING
SYMPTOMS POSSIBLE CAUSES SOLUTIONS
Inside air is too dry Over ventilation - speed setting too high
Dehumidistat setting is too low
Persistent condensation on windows, walls,
ceilings, etc.
Unit stops functioning Electrical supply interrupted Check the unit circuit breaker
Air from supply diffusers too cold Imbalance of supply and exhaust air
Unit makes annoying noise Blower wheel out of alignment Remove the motor/blower assembly
Core freezing up Imbalance of supply and exhaust air
Improper adjustment of dehumidistat
control
Improper ventilation rate
Window frame is too cold or leaky
Outdoor temperature very cold
Defrost damper not functioning
For technical assistance and warranty information,
please call your local supplier.
Adjust speed setting
Set dehumidistat control in a higher position
(if applicable)
Adjust dehumidistat control knob to a lower
setting
Install a dehumidistat (option)
Repair window frame
Check filters and cores for blockage
Check balance of airflows
Install electric duct heater if necessary
and adjust blower wheel
Check filters and cores for blockage
Check balance of airflows
Check for operation of both defrost damper
actuators
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