Bard ERVF-A3, ERVF-C3, CHERV-A3, CHERV-C3 Installation Instructions Manual
INSTALLATION INSTRUCTIONS
WALL MOUNT
ENERGY RECOVERY VENTILATOR
WITH EXHAUST
Models:
ERVF-A3 CHERV-A3
ERVF-C3 CHERV-C3
For Use with Bard
2-1/2 through 3 Ton
Wall Mount™ Air Conditioners
and Heat Pumps
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual: 2100-512B
Supersedes: 2100-512A
Date: 9-20-17
Page 1 of 15
CONTENTS
Model Nomenclature Legend .................................. 3
Electrical Specifications ......................................... 3
General Description .............................................. 3
General Information .............................................. 3
Unpacking ............................................................ 3
Performance and Application Data .......................... 4
Basic Installation (Field Installation) ....................... 5
Basic Installation (Factory-Installed Models) ............ 6
Control Wiring ..................................................... 12
Control Requirements .......................................... 12
Recommended Control Sequences......................... 12
Ventilation Airflow ................................................ 12
Energy Recovery Ventilator Maintenance ................ 13
Figures
Figure 1 Removing Access Panels ...................... 6
Figure 2 Removing Filter and Grille ................... 7
Figure 3 Running Wiring ................................... 8
Figure 4 Control Panel ..................................... 9
Figure 5 Replacing Access Panel ..................... 10
Figure 6 Airflow Diagram ................................ 11
Figure 6A Speed Tap Label ............................... 11
Figure 7 Belt Replacement ............................. 14
Figure 8 Hub Assembly .................................. 15
Tables
Table 1 Ventilation Air (CFM) ......................... 12
Manual 2100-512B
Page 2 of 15
Model Nomenclature Legend
Energy Recovery Ventilator
ERV F — A 3
2-Piece Front Door
Electrical Specifications
Model Voltage Amps
ERVF-A3
CHERV-A3
ERVF-C3
CHERV-C3
230/208 2.2 24V
460 1.2 24V
Control
Voltage
General Description
The wall mount 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
radon, formaldehyde, excess moisture, virus and
bacteria.
The ventilator incorporates patented rotary heat
exchanger 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 Bard W**A, W**H and C**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 ERVF-*3/
CHERV-*3 has two 13” diameter heat transfer wheels.
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 6A on page 11 to change speeds.
The rotating energy wheels provide the heat transfer
effectively during both summer and winter conditions.
Provides required ventilation to meet the requirements
of ASHRAE 62.1 standard.
, smoke,
2
Wall Mount – Cabinet Size
Electrical
A = 230/208 volt
B = 230/208 volt
C = 460 volt
2 = W18-24A, L and H
3 = W30-36A, L and H
5 = W42-60A, L and H
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 step-by-step procedure with which the
mechanically inclined owner can install the package.
The ventilator housing is shipped in one carton, which
contains the following:
1. Energy recovery ventilator
2. Service soor
3. Rain hood and mist eliminator
4. 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.
Manual 2100-512B
Page 3 of 15
Performance and Application Data – ERVF-*3/CHERV-*3
Summer Cooling Performance
(Indoor Design Conditions 75°F DB/62°F WB)
Ambient
O.D.
Ventilation Rate 400 CFM
63% Efficiency
Ventilation Rate 325 CFM
64% Efficiency
Ventilation Rate 250 CFM
65% Efficiency
DB/WB˚F VLT VLS VLL HRT TRS HRL V LT VLS VLL HRT TRS HRL VLT VLS VLL HRT TRS HRL
105/7570
100/
95/
90/
85/
80/
75/7065
65
80
75
70
65
60
80
75
70
65
60
80
75
70
65
60
80
75
70
65
60
75
70
65
60
60
19080
12960
12960
28080
19080
10980
10800
10800
28080
19080
10980
8640
8640
28080
19080
10980
6480
6480
28080
19080
10980
4320
4320
19080
10980
3780
2160
10980
378000
12960
10800
8640
6480
4320
2160
6120
0
0
17280
8280
180
0
0
19440
10440
2340
0
0
21600
12600
4500
0
0
23760
14760
6660
0
0
16920
8820
1620
0
10980
3780
0
12020
8164
8164
17690
12020
6717
6804
6804
17690
12020
6917
5443
5443
17690
12020
6917
4082
4082
17690
12020
6917
2721
2721
12020
6917
2381
1360
6917
238100
8164
6804
5443
4082
2721
1360
3855
0
0
10886
5216
113
0
0
12247
6577
1474
0
0
13608
7938
2835
0
0
14968
9298
4195
0
0
10659
5556
1020
0
6917
2380
0
15502
10530
10530
22815
15502
8921
8775
8775
22815
15502
8921
7020
7020
22815
15502
8921
5265
5265
22815
15502
8921
3510
3510
15502
8921
3071
1755
8921
307100
10530
8775
7020
5265
3510
1755
4972
0
0
14040
6727
146
0
0
15795
8482
1901
0
0
17550
10237
3656
0
0
19305
11992
5411
0
0
13747
7166
1316
0
8921
3071
0
9921
6739
6739
14601
9921
5709
5616
5616
14601
9921
5709
4492
4492
14601
9921
5709
3369
3369
14601
9921
5709
2246
2246
9921
5709
1965
1123
5709
196500
6739
5616
4492
3369
2246
1123
3182
0
0
8985
4305
93
0
0
10108
5428
1216
0
0
11232
6552
2340
0
0
12355
7675
3463
0
0
8798
4586
842
0
5709
1965
0
11925
8100
8100
17550
11925
6862
6750
6750
17550
11925
6862
5400
5400
17550
11925
6862
4050
4050
17550
11925
6862
2700
2700
11925
6862
2362
1350
6862
236200
8100
6750
5400
4050
2700
13520
3825
0
0
10800
5175
112
0
0
12150
6525
1462
0
0
13500
7875
2812
0
0
14850
9225
4162
0
0
10575
5512
1012
0
6862
2362
0
7751
5265
5265
11407
7751
4460
4387
4387
11407
7751
4460
3510
3510
11407
7751
4460
2632
2532
11407
7751
4460
1755
1755
7751
4460
1535
877
4460
153500
5265
4387
3510
2632
1755
877
2486
7019
3363
7897
4241
8774
5118
1828
9652
5996
2705
6873
3583
4460
1535
73
950
658
0
0
0
0
0
0
0
0
0
0
0
0
Winter Heating Performance
(Indoor Design Conditions 70°F DB)
Ambient
O.D.
400 CFM 75% Eff 325 CFM 76% Eff 250 CFM 77% Eff
DB˚ F WVL WHR WVL WHR WVL WHR
65 2160 1620 1755 1333 1350 1039
60 4320 3240 3510 2667 2700 2079
55 6480 4860 5265 4001 4050 3118
50 8640 6480 7020 5335 5400 4158
45 10800 8100 8775 6669 6750 5197
40 12960 9720 10530 8002 8100 6237
35 15120 11340 12285 9336 9450 7276
30 17280 12960 14040 10670 10800 8316
25 19440 14580 15795 12004 12150 9355
20 21600 16200 17550 13338 13500 10395
15 23760 17820 19305 14671 14850 11434
Manual 2100-512B
Page 4 of 15
Ventilation Rate
LEGEND:
VLT = Ventilation Load – Total
VLS = Ventilation Load – Sensible
VLL = Ventilation Load – Latent
HRT = Heat Recover – Total
HRS = Heat Recovery – Sensible
HRL = Heat Recovery – Latent
WVL = Winter Ventilation Load
WHR = Winter Heat Recovery
NOTE: All performance data is based on
operating intake and exhaust blower on
the same speed.
Basic Installation
(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.
Model
ERVF-A3
CHERV-A3 --
ERVF-C3
CHERV-C3 --
!
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.
2. Remove the existing exterior blower access, filter
access and vent access panels on the Bard wall
mount unit. Save the blower access and filter
access panels and discard vent option access
panel (see Figure 1 on page 6).
3. Remove and save existing unit return air filter and
left side filter support bracket by removing two
screws from left side of unit. Remove and save top
four screws from front grille (see Figure 2 on page
7).
4. Remove and discard the exhaust cover plate (see
Figure 2).
For Use with the
Following Units
S26H*-A, -B
W30A*-A, -B
W36A*-A, -B
W30A*-C
W36A*-C
S30H*-A, -B
W30H*-A, -B
W36H*-A, -B
C24H*-A, -B
C30H*-A, -B
S26H*-C
S30H*-C
W30H*-C
W36H*-C
C24H*-C
C30H*-C
CAUTION
Electrical
230/208
1 or 3
phase
230/208
1 or 3
phase
460
3 phase
460
3 phase
5. Install ventilator by inserting the ventilator into
the unit to the far left side, clearing 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 on page
8).
IMPORTANT NOTE: Position front lip of ventilator
under front grille and on top of condenser partition
(as shown in Figure 3 insert). This is important
to ensure proper drainage of any water entering
damper assembly.
6. Open control panel to gain access to unit low
voltage terminal block. (Be sure all power is OFF
prior to opening the control panel.)
7. Route four low voltage electrical leads through the
7/8" bushing in control panel (Figure 3) into low
voltage box.
8. Temporarily connect leads with fork terminals to
corresponding points on terminal strip to terminals
C, R, G and A or O1 depending whether unit is a
heat pump or air conditioner (see Figure 4 on page
9).
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
separate section on Control Wiring.
9. Remove female plug of high voltage wiring harness
from the heat recovery assembly and snap into unit
control panel from the inside of the control panel
in the hole provided. Wire to terminal block. See
Figure 4 and wiring diagram.
10. Plug male plug from ERVF-*3/CHERV-*3 assembly
into female connector at back of control panel (see
Figures 3 and 4).
11. Replace inner and outer control panel covers.
12. Ventilator checkout:
A. Resupply power to unit.
B. Energize the evaporator blower by
switching thermostat to the manual fan
position with Heat/Cool in OFF position.
C. Ventilator heat transfer wheels should rotate
slowly (49 RPM). Intake and exhaust
blowers should run.
D. De-energize the evaporator blower. Energy
recovery heat transfer wheels and fresh air
and exhaust air blowers should stop.
E. This completes ventilator checkout.
14. Disconnect the wires temporarily connected in
Step 8.
15. Re-install the blower access and filter access
panels at top of unit and secure with sheet metal
screws.
Manual 2100-512B
Page 5 of 15
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