Venmar Ventilation Hood 1200 cfm User Manual

Light Commercial  
Heat Recovery Ventilators  
Installation, Operation and Service Instructions  
VB0003  
VB0002  
600 cfm  
700 cfm  
VB0001  
1200 cfm  
06/00  
04597  
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2.3 Mounting Options  
1 Safety Considerations  
There are several options for hanging or floor  
mounting the unit.  
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.  
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 #8 screws provided. Then attach the other  
end of the strap to the ceiling joists, trusses, custom  
frame, etc.  
WARNING  
Disconnect main power switches to unit before  
performing service or maintenance. Electric shock  
can cause personal injury or death.  
2 Installation  
The unit can also be hung with 3/8" (10mm)  
threaded rod and U channels or angles (not supplied)  
as shown in Appendix A.  
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  
exchange cores, insulation, dampers, actuators and  
drain pans are all intact.  
When installing the unit, keep in mind that access to  
the control panel may be required. Supply and exhaust  
ducts to outside may have 1" to 2" (25 to 51mm) 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) (6mm/305mm). 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.  
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.  
2.4 Ductwork  
NOTE:  
The supply and exhaust duct connections on the  
unit are as follows:  
These Heat Recovery Ventilators have minimum  
clearance requirements when mounting. SeeAppendix B  
for specific clearance requirements. Mounting options  
must allow 6" (152mm) clearance in front of control  
cover for access.  
UNIT  
DUCT SIZE  
600 cfm/700 cfm  
14" x 8" (356 x 203mm)  
1200 cfm  
20" x 8" (508 x 203mm)  
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. The  
area should also be easily accessible for maintenance.  
NOTE:  
Duct sizes are for connection purposes only.  
Ducts should be sized to keep noise and pressure drop  
to a minimum.  
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The supply and exhaust ducts connected to  
The duct system should be designed according to  
outside, as well as any ducts passing through an the high speed flow rate of the unit. In order to keep  
unconditioned space, must have a minimum insulation the noise and pressure drop to a minimum, a maximum  
value of R5. In addition, a continuous integral vapor air velocity of 1100 ft/min (5.6 m/sec) should be used  
barrier over the duct insulation must 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.  
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.  
The manufacturer recommends the use of 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.  
All ports on the 600 cfm and 1200 cfm units have  
1" (25mm) flanges to facilitate the installation of the  
ductwork. Please note that the "Fresh Air from  
Outside" 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.  
NOTE:  
Consult local building code for restrictions in  
your area.  
A rodent screen with 1/4" (6mm) 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.  
All ports on the 700 cfm unit have 2" (51mm)  
flanges to facilitate the installation of the ductwork.  
Please note the "Fresh Air From Outside" 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 Outside" connection.  
To maintain optimum airflow performance,  
exterior hood selection must be such that the  
minimum free area of opening is as follows:  
140 inches2 (0.09m2).  
To change the "Fresh Air From Outside" 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 #2 to terminal #3 and  
moving the Red wire from terminal #3 to terminal #2.  
The end result in order to have the "Fresh Air From  
Outside" connection to the top port will be:  
#1 - White, #2 - Red, #3 - Orange.  
2.7 Drains  
The drain fittings provided with the unit will  
accept a 3/4" (19mm) 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.  
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.  
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" (19mm) coupler while it is  
A proper selection of style and size of grilles and attached to the plastic drain fitting as deformation may  
diffusers is required to minimize pressure drop. The occur. Ensure adequate slope is present to allow good  
velocity of the airflow should not exceed 400 ft/min drainage (minimum 1/4" per foot or 6mm per 305mm).  
(2 m/sec) for normal applications.  
Page 4  
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The 700 cfm 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.  
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.  
Unit Check points:  
___ Power connected, no ventilation call - Both fans  
are off, defrost damper (if equipped) closes off  
fresh air from outside.  
The electrical requirements are as follows:  
600 cfm  
700 cfm  
1200 cfm  
VOLTAGE  
MCA  
MOP  
115V  
8.65  
12.5  
115V  
6.63  
9.13  
115V  
13.4  
20  
___ Power connected, low speed call - Both fans on  
low speed internal defrost damper (if equipped)  
opens fresh air from outside. If equipped with  
recirculation module, the internal defrost  
damper closes recirculation opening.  
Control Box Access For Low Speed Setting  
(600 cfm/1200 cfm only)  
Disconnect power to the unit. Remove the four  
screws securing the cover plate as shown in  
Appendix F. Lift off the control cover plate and  
switch the red wire as shown in Appendix F.  
___ Power connected, high speed call - Both fans on  
high speed, defrost damper opens fresh air from  
outside. 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 outside. If equipped  
with recirculation module, the internal defrost  
damper opens recirculation opening.  
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-5.  
___ 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 - 600 cfm and 1200 cfm units only). In cold  
temperatures, defrost cycles will remove frost from  
the heat exchanger to maintain good operation.  
Speed Selection (600 cfm/1200 cfm 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 Appendix E-2 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.  
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  
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.  
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.  
WARNING  
A negative building pressure may develop during  
the defrost cycle with possible backdrafting fumes  
from combustion equipment.  
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Recirculation Defrost Module  
4 Airflow Measurement  
and Balancing  
(Optional - Factory Installed)  
The Recirculation Defrost Module is only available  
with the 600 cfm and 1200 cfm units. The defrost  
cycle is electronically controlled in response to the  
outside 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. 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 600 cfm and 1200 cfm models with recirculation  
defrost, see Appendix B-2 and B-4.  
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.  
Magnehelic gauges and Flow Measuring Stations  
(FMS) are available for 14" x 8" (356 x 203mm) or  
20" x 8" (508 x 203mm) rectangular duct and a range  
of round duct sizes. Please ask your supplier for  
more information.  
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 either a dehumidistat control or  
gas sensor. The following four options are available.  
4.1 Flow Station Positions  
Whether flow stations are permanently installed or  
used temporarily, the position they are placed in is very  
important to ensure accuracy as shown in Appendix C.  
The best locations for mounting the FMS is in the  
long straight sections of ducting where airflow has  
stabilized across the area of the duct. This position  
will provide the most accurate measurements.  
Slide Switch Type  
Dehumidistat to engage high speed exchange.  
Slide switch operation supporting continuous low  
exchange and continuous high exchange.  
The next best location for the FMS is immediately  
before or after a 90 degree elbow and 12" (305mm)  
from any damper. In straight sections of pipe,  
the FMS should be installed at least 30" (762mm)  
from any fan outlet. This applies to the "Supply Air  
Opening" connection on the heat recovery ventilator  
and the "Exhaust Air Opening" connection.  
Push Button Electronic Type  
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.  
With airflow measuring stations permanently  
installed, balancing is done by measuring airflow on  
one side of the heat recovery ventilator and then the  
other. Adjustments can then be made to the damper  
to equalize airflows.  
Pool Electronic Type  
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.  
When using the temporary method, an FMS is  
installed in one air duct of the heat recovery  
ventilator and the flow recorded. The FMS is then  
relocated to the other air duct and the airflow is  
recorded again. Dampers can then be adjusted to  
equalize airflow. This procedure should be repeated  
to ensure that the unit is balanced properly.  
Pollutant Detector Type  
Pollutant monitor to engage low/high exchange.  
Push-button operation supporting: intermittent  
(stand-by) ventilation, continuous low exchange,  
continuous high exchange, maintenance indicator  
light and exchange indicator light.  
Page 6  
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4.2 Balancing Procedure  
1
Before proceeding with balancing, all windows,  
overhead doors and walk-in doors should be closed  
and exhaust systems should be turned off.  
1
The connections between the flow stations and the  
ducts must be sealed with tape. Mount the magnehelic  
gauge in a convenient location where it is level and  
will not vibrate or be bumped. Zero the gauge.  
Measure the exhaust air first as it is often the lowest  
due to a longer duct system.  
VL0001  
2
600 cfm and 1200 cfm  
1. Washable foam filter  
2. MEF filter - optional  
With the fan speed at maximum, connect the hoses  
from the FMS to the magnehelic gauge. If the needle falls  
below zero, reverse the hose connections. Ensure that  
the damper is wide open. Take a reading from the  
magnehelic gauge and record it. Remove the FMS  
and place it in the supply duct. This process is not  
necessary if the FMS is to be permanently mounted.  
1 or 2  
1
Repeat the procedure. If the reading is higher in  
the supply duct, adjust the damper until the reading  
is the same. If the reading is lower, return the FMS  
to the exhaust duct and adjust the damper to obtain  
the same reading as the supply duct.  
VL0002A  
700 cfm  
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 Maintenance and Service  
5.1 Bi-Monthly Maintenance  
WARNING  
Disconnect power before maintaining unit.  
5.2 Annual Maintenance  
WARNING  
Disconnect power before maintaining unit.  
Bi-monthly maintenance should include:  
Air Filters  
Annual service should include:  
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.  
Air Filters  
Vacuum and wash standard foam filters. Replace  
medium efficiency filter 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 fittings to ensure they are  
draining freely.  
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.  
Heat 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.  
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Allow the heat recovery core to soak for three Motor and Blower Removal and Installation  
hours in warm water and mild soap. Rinse under a  
heavy stream of water.  
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 volt power  
source with an electrical cable, as follows:  
WARNING  
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.  
RED + WHITE  
Low speed  
BLUE + WHITE  
BLACK + WHITE  
Medium speed  
High speed  
Fans  
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.  
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 the  
following page for instructions on removing the  
blower assembly.  
If the blower does not run, it must be replaced. To  
replace the motor, remove the heat 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.  
System Operation Check  
Verification of all control modes should be  
checked to ensure proper operation. Refer to the  
Controls Section, Sequence of Operation.  
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.  
REMOVE THESE  
LOCKING PLATE  
2 SCREWS  
CAPACITOR  
700 cfm 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.  
600/1200 cfm ONLY: (CAUTION: 120VAC) Check  
for 120 volt output across the White/Black wires. If  
120 volt can be measured at the motor, replace the  
motor. If 120 volt cannot be measured at the motor,  
check pins J1-9 at the printed circuit board.  
VD0004A  
600 cfm and 1200 cfm  
Main Circuit Board Replacement  
THUMBSCREW  
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.  
SERVICE CONNECTOR  
VD0001A  
700 cfm  
Page 8  
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Appendix A  
Mounting Diagrams  
600 cfm and 1200 cfm  
Diagrams show standard unit configuration.  
For units with the reversed door option, the  
door will be located here.  
NOTE:  
Reinforced  
Rubber Strap  
Recirculation Module  
(Factory Installed)  
3/8" (10mm)  
Threaded Rod  
(Supplied by others)  
Recirculation Module  
(Factory Installed)  
U Channel  
(Supplied by others)  
Recirculation Module  
(Factory Installed)  
Rubber Vibration Isolator  
(Supplied by others)  
Wooden Curb (Supplied by others)  
Bolt to Floor  
Space must be left to allow connection  
of drain lines with adequate slope for drainage  
VD0002A  
700 cfm  
3/8" (10mm)  
Threaded Rod  
(Supplied by others)  
Bolt to Floor  
Wooden Curb  
(Supplied by others)  
Cabinet Mounted  
U Channel  
Dry Contacts  
Space must be left to allow  
connection of drain lines with  
adequate slope for drainage  
Rubber Vibration  
Isolater  
Dry Contacts  
VD0003A  
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Appendix B  
Unit Dimensions  
B-1: 600 cfm (without recirculation module)  
Page 10  
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Appendix B Continued  
Unit Dimensions  
B-2: 600 cfm with recirculation module (factory installed)  
Page 11  
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Appendix B Continued  
Unit Dimensions  
B-3: 1200 cfm (without recirculation module)  
Page 12  
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Appendix B Continued  
Unit Dimensions  
B-4: 1200 cfm with recirculation module (factory installed)  
Page 13  
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Appendix B Continued  
Unit Dimensions  
B-5: 700 cfm  
Page 14  
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Appendix C  
Flow Station Positions  
600 cfm and 1200 cfm  
Reverse Door Option  
Balancing Damper  
Flow Measuring Station (FMS)  
Min. 8" (203mm)  
(Optional) Canvas Vibration Isolator  
Fresh Air  
From Outside  
Min. 12"  
(305mm)  
Min. 30"  
(762mm)  
Exhaust Air  
From Building  
VP0001A  
Canvas Vibration Isolator  
Min. 12"  
(305mm)  
700 cfm  
Flow Measuring  
Station (FMS)  
Balancing Damper  
(not supplied)  
Min.12"  
(304mm)  
Canvas Vibration Isolator  
VP0002A  
Dry Contacts  
Min. 30"  
(762mm)  
Min. 12"  
(304mm)  
Page 15  
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Appendix D  
Drain Connections  
600 cfm and 1200 cfm  
Note:  
Plastic Drain Fittings  
To Drain  
All hose, pipe &  
couplers to be  
supplied by others  
3/4"NPT  
Coupler  
Plastic Hose  
Water Trap  
Copper or  
Plastic Pipe  
T D  
i
700 cfm  
Plastic Drain Fitting  
Note:  
All hose, pipe,  
and couplers to be  
supplied by others.  
3/4" NPT  
Coupler  
To Drain  
Plastic Hose  
Copper or  
Plastic Pipe  
Water Trap  
To Drain  
Page 16  
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Appendix E  
Terminal Control Diagrams  
E-2: Wall Control Connection  
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 700 cfm unit). All field  
installed wiring must be low voltage class II.  
Four types of remote wall controls are available:  
1. Slide Switch Wall Control with fan switch and  
dehumidistat control  
2. Push Button Electronic Wall Control with fan  
mode selection, dehumidistat control and  
maintenance indicator  
Remote Wall Control  
3. Pollutant Wall Control with fan mode selection  
and air pollutant sensor/control  
Optional wall control requires a 4 wire LVT-24  
gauge (or equivalent). This remote wall control runs  
on 12 VDC.  
4. Pool Wall Control with fan mode selection,  
dehumidistat control and high speed  
recirculation mode.  
Low Voltage Controls  
All other terminals are dry contacts.  
The remote wall controls work with the micro-  
processor 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.  
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  
NOTE:  
Remote fan switching requires a single pole, double  
throw switch (SPDT)  
An occupied timer or sensor device cannot be used  
with the push button pool or pollutant wall controls.  
Fan Interlock Relay Output (FF)  
Dry contact closes on ventilation or defrost. Used  
to control external fan.  
WALL CONTROL  
Wall  
Control  
Black  
Green  
WALL CONTROL  
Black  
Green  
Red  
Yellow  
Red  
Yellow  
LOW  
OCCUPIED  
TIMER/  
SENSOR  
LOW  
OCCUPIED  
TIMER/  
SENSOR  
COMMON  
HIGH  
COMMON  
HIGH  
F
F
F
F
CLASS 2 VOLTAGE  
NOTE:  
Connections are all dry  
contacts except wall control  
and 24VAC power supply.  
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.  
Use of 24VAC circuit  
requires isolating contacts  
(ex. thermostat) to prevent  
interconnection of Class 2  
outputs.  
VE0006A  
VE0002A  
Page 17  
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Appendix E Continued  
Terminal Control Diagrams  
E-4: Remote Fan Control  
E-3: Occupied Timer/Sensor Connection  
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!!  
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, CO2 sensor, light sensor, timer,  
building management system, etc. The illustration  
below represents a switch connected to the unit.  
The illustration below shows a factory installed  
jumper and programmable timer option.  
WALL CONTROL  
Black  
Green  
FAN SWITCH  
REMOTE  
LOW  
NOTE:  
Red  
Yellow  
HIGH  
An occupied timer or sensor device cannot be used  
LOW  
OCCUPIED  
TIMER/  
with the push button or pollutant wall controls.  
SENSOR  
COMMON  
HIGH  
OCC. CONTROL  
(field installed)  
JUMPER  
(factory installed)  
NSB Timer  
F
F
Venmar PN 1604128  
WALL CONTROL  
WALL CONTROL  
Black  
Green  
Black  
Green  
CLASS 2 VOLTAGE  
NOTE:  
Connections are all dry  
contacts except wall control  
and 24VAC power supply.  
Red  
Yellow  
Red  
Yellow  
M
1
2
3
4
5
LOW  
LOW  
OCCUPIED  
OCCUPIED  
TIMER/  
TIMER/  
SENSOR  
SENSOR  
COMMON  
HIGH  
COMMON  
HIGH  
Use of 24VAC circuit  
requires isolating contacts  
(ex. thermostat) to prevent  
interconnection of Class 2  
outputs.  
24 (-) VAC  
24 (+) VAC  
F
F
F
F
VE0005A  
CLASS 2 VOLTAGE  
NOTE:  
CLASS 2 VOLTAGE  
NOTE:  
Connections are all dry  
contacts except wall control  
and 24VAC power supply.  
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.  
Use of 24VAC circuit  
requires isolating contacts  
(ex. thermostat) to prevent  
interconnection of Class 2  
outputs.  
VE0003A  
E-5: Fan Interlock Wiring Diagrams  
U n i t C o n t r o l M o d u l e  
9 - P I N A M P P L U G  
T
H
T
E
E
R
R
M
M
O
I
S
N
T
A
A
L
T
G
THERMOSTAT  
TERMINALS  
R
Y
W
J 1  
W
R
G
Y
7
8
9
1
2
3
4
5
6
4
W I R E S  
FOUR  
WIRES  
HR V CONTROL CONNECTOR  
2
W I R E S  
J3  
h e a t i n g o n l y  
TWO WIRES  
w i r i n g  
n u t s  
heating only  
F
F
I
OC OL  
Y
R
G
B
W
G R A Y  
B
R
O
W
N
R
E
D
W
R
G R E E N  
R
N
C
N
O
O
M
G
C
C
B
L
U
E
G
C
Y
* F U R N A C E I N T E R L O C K  
R E L A Y  
Y
F
U
R
N
A
C
E
2 4 - V O L T  
T E R M I N A L B L O C K  
2
W I R E S  
FURNACE  
24-VOLT  
C
O
O
L
I
N
G
S
Y
S
T
E
M
TERMINAL BLOCK  
TWO WIRES  
COOLING SYSTEM  
VE0010A  
VE0009A  
Page 18  
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Appendix F  
Electrical Connection Diagrams  
Control Box Assembly 600 cfm and 1200 cfm  
Remote control access plate  
Remote wiring terminal block  
Control box  
HRV Cabinet  
Control cover plate  
VE0001A  
Low Speed Setting Wire Connections 600 cfm and 1200 cfm  
12 pin  
2 pin  
LOW SPEED SETTING  
To change the minimum speed setting from  
Low To Medium, move the fork connector:  
from here  
to here  
Low Speed (Red)  
Med Speed (Blue)  
Remove power  
before installing  
or removing  
JU1-F Extended  
J U 1  
Defrost Jumper  
VE0004A  
Page 19  
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Appendix G  
Make-up Heat Requirements  
1200 cfm  
600 cfm and 700 cfm  
Page 20  
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Appendix H  
Wiring Diagram  
Wiring Diagram for 600 cfm unit  
C
M H  
C L M H  
L
J 6  
J 5  
T 2  
C
C
L O W S P E E D  
R 2 - 1  
6
4
2
C O 5 M  
N O  
3
1
N C  
T 7  
B K  
Y
J 3 9  
J 3 6  
A U T O T R A N S F O R M E R  
R
J 3 7  
G
J 3 8  
B L  
B L  
J 3 2  
J 3 1  
7 8 9  
F
1
I
3
Y
R
G
8
B
9
F J 3 4 O L  
T 7  
2
6
7
5 4  
A B C D E F G  
6
1
2
J 4  
2 J 2  
1
3
J U 1  
3 2 1  
J 1  
Page 21  
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Appendix H Continued  
Wiring Diagram  
Wiring Diagram for 700 cfm unit  
T 7  
B K  
Y
R
G
B L  
B L  
T 7  
J 3  
7 8 9  
F
O C O L  
Y
R
G
B
1 F 2 I 3  
A B C D E F G  
4
6
1
2
J 4  
1
J 2  
J U 1  
3 2 1  
J 1  
Page 22  
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Appendix H Continued  
Wiring Diagram  
Wiring Diagram for 1200 cfm unit  
C
M H  
C L M H  
L
J 6  
J 5  
T 2  
C
C
L O W S P E E D  
R 2 - 1  
6
4
2
5
C O M  
N O 3  
1
N C  
T 7  
B K  
Y
J 3 9  
J 3 6  
A U T O T R A N S F O R M E R  
R
J 3 7  
G
J 3 8  
B L  
B L  
J 3 2  
J 3 1  
7 8 9  
F
1
I
3
Y
R
G
8
B
9
F J 3 O 4 C O L  
2
6
7
5 4  
T 7  
A B C D E F G  
6
1
2
J 4  
2 J 2  
1
3
J U 1  
3 2 1  
J 1  
Page 23  
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Appendix I  
Trouble Shooting  
SYMPTOMS  
POSSIBLE CAUSES  
SOLUTIONS  
Inside air is too dry  
Over ventilation - speed setting  
too high  
Adjust speed setting  
Dehumidistat setting is too low  
Set dehumidistat control in a  
higher position (if applicable)  
Persistent condensation on  
windows, walls, ceilings, etc.  
Improper adjustment of  
dehumidistat control  
Adjust dehumidistat control knob  
to a lower setting  
Improper ventilation rate  
Window frame is too cold or leaky  
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 filters and cores for blockage  
Check balance of airflows  
Install electric duct heater  
if necessary  
Unit makes annoying noise  
Blower wheel out of alignment  
Remove the motor/blower  
assembly and adjust blower wheel  
Heat exchange core freezing up  
Imbalance of supply and exhaust air  
Defrost damper not functioning  
Check filters and cores for blockage  
Check balance of airflows  
Check for operation of both  
defrost damper actuators  
For technical assistance and warranty information,  
please call your local supplier.  
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