Figure 8 Belt Replacement Instructions ........... 15
Figure 9 Hub Assembly with Ball Bearings ....... 16
Tables
Table 1 Model Reference ................................. 6
Table 2 Ventilation Air ................................... 11
Install Fresh Air Intake Hood Assembly
. 10
Manual 2100-701
Page 2 of 16
Page 3
WALL MOUNT ENERGY RECOVERY VENTILATOR MODEL NOMENCLATURE
Energy Recovery Ventilator
Fixed (24V ON/OFF)
A – 230/208 volt
C – 460 volt
ERV F – A 3
Electrical
ELECTRICAL SPECIFICATIONS
ModelVoltageAmps
ERV-FA2
ERV-FA3
ERV-FC2
ERV-FC3
230/2082.224V
4601.224V
Control
Voltage
GENERAL DESCRIPTION
The energy recovery ventilator was designed to provide
energy efficient, cost effective ventilation to meet IAQ
(Indoor Air Quality) requirements while still maintaining
good indoor comfort and humidity control for a variety
of applications such as schools, classrooms, lounges,
conference rooms, beauty salons and others. It provides
a constant supply of fresh air for control of airborne
pollutants including CO
excess moisture, virus and bacteria.
The ventilator incorporates patented rotary heat
exchanger technology to remove both heat and moisture.
It is designed as a single package which can be easily
factory or field installed for new installations or retrofit
to the new Bard W**A and W**H series wall-mounted
units. The package consists of a unique rotary energy
recovery cassette that can be easily removed for
cleaning or maintenance. The ERV-F*3 has two 13"
diameter heat transfer wheels whereas the ERV-F*2 has
one 13" diameter heat transfer wheel. The heat transfer
wheels use a permanently bonded dry desiccant
coating for total heat recovery.
Ventilation is accomplished with two blower/motor
assemblies each consisting of a drive motor and dual
blowers for maximum ventilation at low sound levels.
The intake and exhaust blowers can be operated at the
same speed (airflow rate) or different speeds to allow
flexibility in maintaining desired building pressurization
conditions. Factory shipped on medium intake and low
exhaust. See Figure 6 on page 12 to change speeds.
, smoke, radon, formaldehyde,
2
Wall Mount Cabinet Size
2 – W18 thru W24A* and H*
3 – W30 thru W36A* and H*
(* revision letter)
The rotating energy wheels provide the heat transfer
effectively during both summer and winter conditions.
Provide required ventilation to meet the requirements
of ASHRAE 62.1 standard.
NOTE: During operation below 5°F outdoor
temperature, freezing of moisture in the heat
transfer wheel can occur. Consult the factory if
this possibility exists.
GENERAL INFORMATION
The ventilator should only be installed by a trained
heating and air conditioning technician. These
instructions serve as a guide to the technician installing
the ventilator package. They are not intended as a stepby-step procedure with which the mechanically inclined
owner can install the package.
The ventilator housing is shipped in one carton which
contains the following:
• Energy recovery ventilator
• Exhaust damper assembly
• Service door
• Rain hood and mist eliminator
• Installation instructions
UNPACKING
Upon receipt of the equipment, be sure to compare the
model number found on the shipping label with the
accessory identification information on the ordering and
shipping document to verify that the correct accessory
has been shipped.
Inspect the carton housing of each ventilator as it is
received and, before signing the freight bill, verify that
all items have been received and that there is no visible
damage. Note any shortages or damage on all copies
of the freight bill. The receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent. Concealed
damage not discovered until after loading must be
reported to the carrier within 15 days of its receipt.
operating intake and exhaust blower on
the same speed.
Manual 2100-701
Page 5 of 16
Page 6
BASIC FIELD INSTALLATION
1. Unpack the ventilator assembly which includes the
integral ventilator with attached electrical harness
and miscellaneous hardware.
!
WARNING
Open and lock unit disconnect switch
before installing this accessory to prevent
injury or death due to electrical shock or
contact with moving parts. Turn thermostat
to OFF.
2. Disconnect unit power.
3. Remove the existing exterior blower access, filter
access and vent option panels on the wall mount
unit (see Figure 1). Save the blower access and
filter access panels and discard the vent option
panel.
FIGURE 1
Remove Access Panels
TABLE 1
Model Reference
Model
ERV-FA2
ERV-FC2W24AB-CW24HB-C
ERV-FA3
ERV-FC3
!
Be sure the correct model and voltage
energy recovery ventilator is used with
the correct air conditioner or heat pump to
ensure correct voltage compatibility.
For Use with the
Following Units
W18AB-A
W24AB-A, -B
W30AB-A, -B
W36AB-A, -B
W30AB-C
W36AB-C
W18HB-A
W24HB-A, -B
W30HB-A, -B
W36HB-A, -B
W30HB-C
W36HB-C
CAUTION
Electrical
230/208V
1 or 3 phase
460V
3 phase
230/208V
1 or 3 phase
460ERV-F
3 phase
FILTER ACCESS PANEL
BLOWER ACCESS
PANEL
VENT OPTION PANEL
Manual 2100-701
Page 6 of 16
Page 7
4. Remove and save existing unit return air filter.
Remove left side filter support bracket by
unscrewing two (2) screws from left side of unit.
Remove and save top four (4) screws from front
grille (see Figure 2).
5. Remove and discard exhaust cover plate (see
Figure 2).
Remove Filter, Filter Support Bracket and Exhaust Cover Plate
FILTER FILL
LEFT FILTER
BRACKET
FILTER
FIGURE 2
REMOVE & DISCARD
EXHAUST COVER PLATE
(4) SCREWS
HOLDING FRONT GRILLE
MIS-4003
Manual 2100-701
Page 7 of 16
Page 8
6. Insert ventilator into the unit to the far left side,
making sure to clear the right filter bracket. Once
the ventilator is fully inserted, slide the ventilator
to the right until it is tight against the back of the
control panel (see Figure 3).
IMPORTANT NOTE: Position front lip of ventilator
over front grille and on top of condenser partition
(see Figure 3 inset). This is important to ensure
proper drainage of any water entering damper
assembly.
Install Ventilator
7. Remove outer and inner control panel covers.
8. Remove female plug of high voltage wiring harness
(3-pin plug) from the heat recovery assembly
and snap into unit control panel (from inside
control panel) in the hole provided. Wire to top of
compressor contactor per wiring diagram (on ERV).
Connect high voltage plugs back together (see
Figure 3).
FIGURE 3
CAUTION: HOLE IN ERV-F MUST
CAUTION:HOLEINERV-FMUST
BE USED TO ENSURE CLEARANCE
BEUSEDTO INSURECLEARANCE
FROM CONDENSER COIL TUBING
FROMCONDENSERCOILTUBING
SERVICE DOOR
FIGURE 3 (INSET)
LIP OF ERV IS TO BE
BETWEEN THE CONDENSER
GRILL AND SERVICE DOOR
FRONT GRILLE
HIGH & LOW VOLTAGE
TO PLUG IN SIDE OF
CONTROL PANEL
WHEN INSTALLING ERV-F POSITION
SO THAT HOLE IN FROM LIP IS
CENTERED OVER HOLE IN CONDENSER
GRILLE TO INSERT A SELF DRILLING
SCREW
HEAT RECOVERY
VENTILATOR
CONDENSER
PARTITION
SIDE SECTION VIEW
MIS-4004
Manual 2100-701
Page 8 of 16
Page 9
9. Plug low voltage plug (12-pin plug) from the heat
recovery unit into the front side of the control
panel (see Figures 3 and 4).
NOTE: These 24 volt control wires control the starting
and stopping of the energy recovery ventilator
and can be independently controlled by an
energy management control or timer. See
Control Wiring on page 11.
FIGURE 4
Install Low and High Voltage Plugs and Wiring
11. Replace inner and outer control panel covers.
12. Ventilator checkout
A. Resupply power to unit.
B. Energize the “A” occupancy 24 volt signal on
the low voltage terminal strip (jumper “R” to
“A”).
INSTALL INCLUDED HIGH
VOLTAGE 3-PIN PLUG INTO
SIDE OF CONTROL PANEL,
THEN ROUTE THE WIRES AS
SHOWN, AND WIRE PER WIRE
DIAGRAM.
WIRE DIAGRAM
PROVIDED ON ERV
LOW VOLTAGE 12 PIN PLUG
FROM ERV ASSEMBLY
GROUND WIRE
HIGH VOLTAGE WIRES
MIS-3776
MIS-3776
Manual 2100-701
Page 9 of 16
Page 10
C. Ventilator heat transfer wheels should rotate
slowly (49 RPM). Intake and exhaust blowers
should run and indoor comfort blower should
run.
D. De-energize the “A” terminal. The energy
recovery wheels, fresh air, exhaust air and
indoor comfort blowers should stop.
E. This completes ventilator checkout.
13.
Re-install the blower access and filter access panels
at top of unit and secure with sheet metal screws.
Install Fresh Air Intake Hood Assembly
INSERT FLANGE THRU SLOT IN DOOR AND
PUSH FLANGE UNDER INSULATION
INSULATION
FILTER
ACCESS
PANEL
14.
15. Apply Certification label, included with installation
16. Ventilator is now ready for operation.
FIGURE 5
Replace the vent option access panel with the new
panel provided. Attach air intake hood with screws
provided (see Figure 5). Be sure to insert the top
flange of the air intake hood into and through the
slot of the service door and between the door and
insulation to prevent bowing of the door.
instructions, next to unit serial plate.
FRESH AIR INTAKE
HOOD AND FILTER
ASSEMBLY
FILTER ACCESS
SCREW
REPLACE SERVICE ACCESS PANEL AND
INSTALL FRESH AIR INTAKE HOOD
ASSEMBLY AS SHOWN
Manual 2100-701
Page 10 of 16
Page 11
CONTROL WIRING
The ERV-F comes from the factory with the low voltage
control wires connected to the wall mount low voltage
terminal strip. Care must be taken when deciding
how to control the operation of the ventilator. When
designing the control circuit for the ventilator, the
following requirements must be met.
Control Requirements
1. Indoor blower motor will automatically run
whenever the ERV-F is run.
2. Select the correct motor speed tap in the ERV-F.
Using Table 2, determine the motor speed needed
to get the desired amount of ventilation air
needed. For instance, do not use the high speed
tap on a ERV-F*3 if only 250 CFM of ventilation
air is needed. Use the low speed tap instead (see
VENTILATION AIRFLOW for information on
moving the speed taps). Using the high speed tap
would serve no useful purpose and significantly
affect the overall efficiency of the air conditioning
system. System operating cost would also increase.
TABLE 2
Ventilation Air (CFM)
Model
ERV-FA2
ERV-FC2
ERV-FA3
ERV-FC3
3. Run the ERV-F only during periods when the
conditioned space is occupied. Running the
ERV-F during unoccupied periods wastes energy,
decreases the expected life of the ERV-F and can
result in a large moisture buildup in the structure.
The ERV-F removes 60-70% of the moisture in the
incoming air, not 100% of it. Running the ERV-F
when the structure is unoccupied allows moisture
to build up in the structure because there is little
or no cooling load. Thus, the air conditioner is not
running enough to remove the excess moisture
being brought in. Use a control system that
in some way can control the system based on
occupancy.
!
High Speed
(Black)
250225200
400325250
IMPORTANT
Medium Speed
(Blue)
Low Speed
(Red)
Recommended Control Sequences
Several possible control scenarios are listed below:
1. Use a programmable electronic thermostat with
auxiliary terminal to control the ERV-F based
on daily programmed occupancy periods. Bard
markets and recommends Bard Part No. 8403060 programmable electronic thermostat for air
conditioner and heat pump applications.
2. Use a motion sensor in conjunction with a
mechanical thermostat to determine occupancy
in the structure. Bard recommends Bard Model
CS9B*-**** CompleteStat for this application.
3. Use a CO
ERV-F when CO
4. Use a DDC control system to control the ERV-F
based on a room occupancy schedule to control
the ERV-F.
5. Tie the operation of the ERV-F into the light switch.
The lights in a room are usually on only when
occupied.
6.
Use a manual timer that the occupants turn to
energize the
7. Use a programmable mechanical timer to energize
the ERV-F and indoor blower during occupied
periods of the day.
control with dry contacts to energize the
2
levels rise above desired settings.
2
ERV-F
for a specific number of hours.
VENTILATION AIRFLOW
The ERV-FA* and ERV-FC* are equipped with a
3-speed motor to provide the capability of adjusting
the ventilation rates to the requirements of the specific
application by changing motor speeds (see Table 2).
!
WARNING
Open disconnect to shut all power OFF
before changing motor speeds. Failure to
do so could result in injury or death due to
electrical shock.
The units are set from the factory with the exhaust
blower on the low speed and the intake blower on
medium speed. Moving the speed taps located in the
control panel can change the blower speed of the
intake and exhaust (see Figure 6 on page 12).
Operating the ERV-F during unoccupied
periods can result in a buildup of moisture
in the structure.
Manual 2100-701
Page 11 of 16
Page 12
FIGURE 6
Speed Tap Label
Manual 2100-701
Page 12 of 16
Page 13
FIGURE 7
Airflow Diagram
Manual 2100-701
Page 13 of 16
Page 14
ENERGY RECOVERY VENTILATOR
MAINTENANCE
General Information
The ability to clean exposed surfaces within air moving
systems is an important design consideration for the
maintenance of system performance and air quality.
The need for periodic cleaning will be a function of
operating schedule, climate and contaminants in the
indoor air being exhausted and in the outdoor air being
supplied to the building. All components exposed to
the airstream, including energy recovery wheels, may
require cleaning in most applications.
Rotary counterflow heat exchanges (heat wheels) with
laminar airflow are “self-cleaning” with respect to
dry particles. Smaller particles pass through; larger
particles land on the surface and are blown clear
as the flow direction is reversed. For this reason,
the primary need for cleaning is to remove films of
oil-based aerosols that have condensed on energy
transfer surfaces. Buildup of material over time may
eventually reduce airflow. Most importantly, in the
case of desiccant-coated (enthalpy) wheels, such films
can close off micron-sized pores at the surface of the
desiccant material, reducing the efficiency with which
the desiccant can absorb and desorb moisture.
water molecules. The continued ability of an enthalpy
wheel to transfer latent energy depends upon the
permanence of the bond between the desiccant and
the energy transfer surfaces.
Bard wheels feature silica gel desiccant permanently
bonded to the heat exchange surface without
adhesives; the desiccant will not be lost in the washing
process. Proper cleaning of the Bard energy recovery
wheel will restore latent effectiveness to near original
performance.
Maintenance Procedures
NOTE: Local conditions can vary and affect the
required time between routine maintenance
procedures; therefore, all sites (or specific
units at a site) may not have the same
schedule to maintain acceptable performance.
The following timetables are recommended and
can be altered based on local experience.
Quarterly Maintenance
1. Inspect mist eliminator/prefilter and clean if
necessary. This filter is located in the fresh air
intake hood on the front of the unit. This is an
aluminum mesh filter and can be cleaned with
water and any detergent not harmful to aluminum.
Frequency
In a reasonably clean indoor environment such as a
school, office building or home, experience shows that
reductions of airflow or loss of sensible (temperature)
effectiveness may not occur for 10 or more years.
However, experience also shows that measurable
changes in latent energy (water vapor) transfer can
occur in shorter periods of time in commercial,
institutional and residential applications experiencing
moderate occupant smoking or with cooking facilities.
In applications experiencing unusually high levels
of occupant smoking, such as smoking lounges,
nightclubs, bars and restaurants, washing of energy
transfer surfaces, as frequently as every 6 months,
may be necessary to maintain latent transfer efficiency.
Similar washing cycles may also be appropriate for
industrial applications involving the ventilation of high
levels of smoke or oil-based aerosols such as those
found in welding or machining operations, for example.
In these applications, latent efficiency losses of as
much as 40% or more may develop over a period of 1
to 3 years.
Cleanability and Performance
In order to maintain energy recovery ventilation
systems, energy transfer surfaces must be accessible
for washing to remove oils, grease, tars and dirt that
can impede performance or generate odors. Washing
of the desiccant surfaces is required to remove
contaminate buildups that can reduce absorption of
2. Inspect wall mount unit filter and clean or replace
as necessary. This filter is located either in the
unit, in a return air filter grille assembly or both.
If in the unit it can be accessed by removing the
lower service door on the front of the unit. If in a
return air filter grille, by hinging the grille open to
gain access.
3. Inspect energy recovery ventilator for proper wheel
rotation and dirt buildup. This can be done in
conjunction with Item 2 above. Energize the energy
recovery ventilator after inspecting the filter and
observe for proper rotation and/or dirt buildup.
4. Recommended energy recovery wheel cleaning
procedures follow: Disconnect all power to
unit. Remove the lower service door of the wall
mount unit to gain access to the energy recovery
ventilator.
5. Remove the front access panel on the ventilator.
Unplug amp connectors to cassette motors. Slide
energy recovery cassette out of ventilator.
6. Use a shop vacuum with brush attachment to clean
both sides of the energy recovery wheels.
7. Reverse shop vacuum to use as a blower and blow
out any residual dry debris from the wheel.
NOTE: Discoloration and staining of the wheel does
not affect its performance. Only excessive
buildup of foreign material needs to be
removed.
Manual 2100-701
Page 14 of 16
Page 15
8. If any belt chirping or squealing noise is present,
Belt Replacement
Instructions
MIS-1890
Route this part of replacement
belt in bottom groove of pulley.
Route this part of replacement
belt in top groove of pulley.
If belt "squeaks" or "chirps"
lubricate lightly with LPS-1
or equivalent "dry film"
lubricant.
apply a small amount of LPS-1 or equivalent dry
film lubricant to the belt.
3. Rinse wheel thoroughly after application of the
cleaning solution and allow to drain before reinstalling.
Annual Maintenance
1. Inspect and conduct the same procedures as
outlined under Quarterly Maintenance.
2. To maintain peak latent (moisture) removal
capacity, it is recommended that the energy
recovery wheels be sprayed with a diluted nonacidbased evaporator coil cleaner or alkaline detergent
solution such as 409.
NOTE: Do not use acid-based cleaners, aromatic
solvents, temperatures in excess of 170°F or
steam. Damage to the wheel may result.
Do not disassemble and immerse the entire
heat wheel in a soaking solution, as bearing
and other damage may result.
Belt Replacement Instructions
(Two Wheel Cassette Only)
4. No re-lubrication is required to heat wheel bearings
of the drive motor, or to the intake and exhaust
blower motors.
5. If any belt chirping or squealing noise is present,
apply a small amount of LPS-1 or equivalent dry
film lubricant to the belt.
Figure 8
Manual 2100-701
Page 15 of 16
Page 16
FIGURE 9
Hub Assembly with Ball Bearings
Manual 2100-701
Page 16 of 16
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