Bard ERVF-A3, ERVF-C3, CHERV-A3, CHERV-C3 Installation Instructions Manual

Page 1
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
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
Page 2
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
Page 3
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
Page 4
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.
Page 5
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
Page 6
16. Replace the vent option access panel with the new panel provided. Attach air intake hood with screws provided (see Figure 5 on page 10). Be sure to insert the top flange of the air intake hood into and through the slot in the service door and between the door and insulation to prevent bowing of the door.
17. Apply Certification label, included with installation instructions, next to unit serial plate.
18. Ventilator is now ready for operation.
FIGURE 1
Removing Access Panels
Basic Installation (Factory-Installed Models)
1. Remove blower access, filter access and vent option panels. Remove filter bracket from shipping location and install on left side. Remove filter located above air circulation blowers. Install filter.
2. Remove air intake hood from shipping location and install air intake hood on vent option panel. Refer to the Control Wiring Section for suggested control schemes. After wiring, replace all panels.
REMOVE & SAVE
Manual 2100-512B Page 6 of 15
REMOVE & DISCARD
Page 7
FIGURE 2
Removing Filter and Grille
REMOVE & DISCARD
Manual 2100-512B Page 7 of 15
Page 8
FIGURE 3
Running Wiring
FIGURE 3 –
INSET
SIDE VIEW -
SEE STEP 5 OF
INSTRUCTIONS
Manual 2100-512B Page 8 of 15
Page 9
MIS-2641
INSTALL 1-480701-0 CAP AS SHOWN AND WIRE PER WIRING DIAGRAM
FROM HEAT RECOVERY ASSEMBLY.
LOW VOLTAGE WIRES
TEMPORARY CONNECTION FOR TESTING. SEE RECOMMENDED CONTROL SEQUENCES
FIGURE 4
Control Panel
Manual 2100-512B Page 9 of 15
Page 10
FIGURE 5
Replacing Access Panel
Manual 2100-512B Page 10 of 15
Page 11
FIGURE 6
Airflow Diagram
FIGURE 6A – Speed Tap Label
Manual 2100-512B Page 11 of 15
Page 12
Control Wiring
The ERVF-*3/CHERV-*3 comes from the factory with the low voltage control wires not wired into 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 must be run whenever the ERVF-*3/CHERV-*3 is run.
2. Select the correct motor speed tap in the ERVF-*3/CHERV-*3. Using Table 1 to 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 ERVF-A3 if only 250 CFM of ventilation air is needed; use the low speed tap. 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.
3. Run the ERVF-*3/CHERV-*3 only during periods when the conditioned space is occupied. Running the ERVF-*3/CHERV-*3 during unoccupied periods wastes energy, decreases the expected life of the ERVF-*3/CHERV-*3 and can result in a large moisture buildup in the structure. The ERVF-*3/ CHERV-*3 removes 60 to 70% of the moisture in the incoming air, not 100% of it. Running the ERVF-*3/CHERV-*3 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.
IMPORTANT
2. Use a motion sensor in conjunction with a mechanical thermostat to determine occupancy in the structure. Bard markets the CS2000A for this use.
3. Use a DDC control system to control the ERVF-*3/ CHERV-*3 based on a room occupancy schedule to control the ERVF-*3/CHERV-*3.
4. Tie the operation of the ERVF-*3/CHERV-*3 into the light switch. The lights in a room are usually on only when occupied.
5. Use a manual timer that the occupants turn to energize the ERVF-*3/CHERV-*3 for a specific number of hours.
6. Use a programmable mechanical timer to energize the ERVF-*3/CHERV-*3 and indoor blower during occupied periods of the day.
Ventilation Airflow
The ERVF-*3 and CHERV-*3 are equipped with a 3-speed motor to provide the capability of adjusting the ventilation rates to the requirements of the specific application by simply changing motor speeds.
TABLE 1
Ventilation Air (CFM)
High
Model
ERVF-A3
CHERV-A3
ERVF-C3
CHERV-C3
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 6A on page 11.
Speed
(Black)
400 325 250
Medium
Speed
(Blue)
Low
Speed
(Red)
Operating the ERVF-*3/CHERV-*3 during unoccupied periods can result in a build up of moisture in the structure.
Recommended Control Sequences
Several possible control scenarios are listed below:
1. Use a programmable electronic thermostat with auxiliary terminal to control the ERVF-*3/ CHERV-*3 based on daily programmed occupance periods. Bard markets and recommends the Bard Part No. 8403-060 programmable electronic thermostat for air conditioner and heat pump applications.
Manual 2100-512B Page 12 of 15
!
WARNING
Open disconnect to shut all power OFF before making adjustments to the speed taps. Failure to do so could result in injury or death due to electric shock.
Page 13
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.
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 adsorption of 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.
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, it can be accessed 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 Step 2 above. Energize the energy recovery ventilator after inspecting the filter and observe for proper rotation and/or dirt buildup.
4. For recommended energy recovery wheel cleaning procedures, follow Steps 5 through 8.
5. Disconnect all power to unit. Remove the lower service door of the wall mount unit to gain access to the energy recovery ventilator.
6. Remove the front access panel on the ventilator. Unplug amp connectors to cassette motors. Slide energy recovery cassette out of ventilator.
7. Use a shop vacuum with brush attachment to clean both sides of the energy recovery wheels.
8. 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.
9. If any belt chirping or squealing noise is present, apply a small amount of LPS-1 or equivalent dry film lubricant to the belt.
Manual 2100-512B Page 13 of 15
Page 14
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.
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 nonacid based 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.
3. Rinse wheel thoroughly after application of the cleaning solution and allow to drain before re­installing.
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 7
Manual 2100-512B Page 14 of 15
Page 15
FIGURE 8
Hub Assembly with Ball Bearings
Manual 2100-512B Page 15 of 15
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