Bard ERV-FA2, ERV-FC2, ERV-FA3, ERV-FC3 Installation Instructions Manual

Page 1
INSTALLATION INSTRUCTIONS
Wall Mount Energy Recovery Ventilator
with Exhaust
Models:
ERV-FA2 ERV-FC2 ERV-FA3 ERV-FC3
For Use with Bard 1.5 – 3 Ton
Wall Mount Air Conditioners and Heat Pumps
Bard Manufacturing Company, Inc. Bryan, Ohio 43506
Manual: 2100-701 Supersedes: NEW Date: 3-1-19
Page 1 of 16
Page 2
CONTENTS
Model Nomenclature .............................................. 3
Electrical Specifications ......................................... 3
General Description .............................................. 3
General Information .............................................. 3
Unpacking ............................................................ 3
Performance and Application Data – WERVP*2 ........ 4
Performance and Application Data – WERVP*3 ........ 5
Basic Field Installation ........................................... 6
Control Wiring ..................................................... 11
Ventilation Airflow ................................................ 11
Energy Recovery Ventilator Maintenance ................ 14
Figures
Figure 1 Remove Access Panels ........................ 6
Figure 2 Remove Filter, Filter Support Bracket and Exhaust Cover Plate and Install
Exhaust Damper Assembly ................... 7
Figure 3 Install Ventilator ................................. 8
Figure 4 Install Low and High Voltage Plugs
and Wiring .......................................... 9
Figure 5
Figure 6 Speed Tap Label ............................... 12
Figure 7 Airflow Diagram ................................ 13
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
Model Voltage Amps
ERV-FA2 ERV-FA3
ERV-FC2 ERV-FC3
230/208 2.2 24V
460 1.2 24V
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.
Manual 2100-701 Page 3 of 16
Page 4
PERFORMANCE AND APPLICATION DATA – ERV-F*2
Summer Cooling Performance
(Indoor Design Conditions 75°DB/62°WB)
Ambient
OD
DB/
F VLT VLS VLL HRT HRS HRL V LT VLS VLL HRT HRS HRL V LT VLS VLL HRT HRS HRL
WB
1057570
100
95
90
85
80
757065
11925
8100
65
8100
80
17550
75
11925
70
6863
65
6750
60
6750
80
17550
75
11925
70
6863
65
5400
60
5400
80
17550
75
11925
70
6863
65
4050
60
4050
80
17550
75
11925
70
6683
65
2700
60
2700
75
11925
70
6863
65
2363
60
1350
6863 2363
60
Ventilation Rate 250 CFM
8100 8100 8100
6750 6750 6750 6750 6750
5400 5400 5400 5400 5400
4050 4050 4050 4050 4050
2700 2700 2700 2700 2700
1350 1350 1350 1350
0 0
0
0
62% Efficiency
1325
79394
0
5022
0
5022
10800
10881
5175
7394
113
4255
0
4185
0
4185
12150
10881
6525
7394
1463
4255
0
3348
0
3348
13500
10881
7875
7394
2813
4255
0
2511
0
2511
14850
10881
9225
7394
4163
4255
0
1674
0
1674
10575
7394
5513
4255
1013
1465
0
837
6863
4255
2363
1465
0
Ventilation Rate 225 CFM
63% Efficiency
2168
822
10727
7287
3441
6758
5022 5022 5022
4185 4185 4185 4185 4185
3348 3348 3348 3348 3348
2511 2511 2511 2511 2511
1674 1674 1674 1674 1674
0
837 837 837 837
0
7287 7287
15788 10727
6173 6072 6072
15788 10727
6173 4858 4858
15788 10727
6173 3643 3643
15788 10727
6173 2429 2429
10727
6173 2125 1214
6173 2125
0
7287 7287
6072 6072 6072 6072 6072
4858 4858 4858 4858 4858
3643 3643 3643 3643 3643
2429 2429 2429 2429 2429
1214 1214 1214 1214
0
6696 3209
70
0 0
7533 4046
907
0 0
8370 4883 1744
0 0
9207 5720 2581
0 0
6557 3418
628
0
4255
0
1465
0
0
0
0 0
9716 4655
101
0 0
10930
5870 1315
0 0
12145
7084 2530
0 0
13359
8298 3744
0 0
9513 4959
911
0
0
6173
0
2125
0
0
4591 4591
9946 6758 3889 3826 3826
9946 6758 3889 3060 3060
9946 6758 3889 2295 2295
9946 6758 3889 1530 1530
6758 3889 1339
765
6889 1339
0
4591 4591 4591
3826 3826 3826 3826 3826
3060 3060 3060 3060 3060
2295 2295 2295 2295 2295
1530 1530 1530 1530 1530
765 765 765 765
0 0 0
0 0
6121 2933
64
0 0
6886 3698
829
0 0
7651 4463 1594
0 0
8416 5228 2359
0 0
5993 3124
574
0
6889 1339
0
9540 6480 6480
14040
9540 5490 5400 5400
14040
9540 5490 4320 4320
14040
9540 5490 3240 3240
14040
9540 5490 2160 2160
9540 5490 1890 1080
5490 1890
Ventilation Rate 200 CFM
6480 6480 6480
5400 5400 5400 5400 5400
4320 4320 4320 4320 4320
3240 3240 3240 3240 3240
2160 2160 2160 2160 2160
1080 1080 1080 1080
0 0
0
0
63% Efficiency
3060
6010
0
4082
0
4082
8640
8845
4140
6010
90
3458
0
3402
0
3402
9720
8845
5220
6010
1170
3458
0
2722
0
2722
10800
8845
6300
6010
2250
3458
0
2041
0
2041
11880
8845
7380
6010
3300
3458
0
1361 1361
0
8460
6010
4410
3458
810
1190
0
680
5490
3458
1890
1190
0
0
4082 4082 4082
3402 3402 3402 3402 3402
2722 2722 2722 2722 2722
2041 2041 2041 2041 2041
1361 1361 1361 1361 1361
680 680 680 680
0 0 0
1928
0 0
5443 2608
56
0 0
6124 3289
737
0 0
6804 3969 1417
0 0
7484 4649 2098
0 0
5330 2778
510
0
3458 1190
0
Winter Heating Performance
(Indoor Design Conditions 70°F DB)
Ambient
OD
DB/°F WVL WHR WVL WHR WVL WHR
65 1350 999 1214 911 1080 810
60 2700 1998 2429 1822 2160 1620
55 4050 2997 3643 2733 3240 2430
50 5400 3996 4858 3643 4320 3240
45 6750 4995 6072 4554 5400 4050
40 8100 5994 7287 5465 6480 4860
35 9450 6993 8501 6376 7560 5670
30 10800 7992 9716 7287 8640 6480
25 12150 8991 10930 8198 9720 7290
20 13500 9990 12145 9108 10800 8100
15 14850 10989 13359 10019 11880 8910
250 CFM 74% Eff. 225 CFM 75% Eff. 200 CFM 75% Eff.
Ventilation Rate
LEGEND:
VLT = Ventilation Load – Total VLS = Ventilation Load – Sensible VLL = Ventilation Load – Latent HRT = Heat Recovery – 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.
Manual 2100-701 Page 4 of 16
Page 5
PERFORMANCE AND APPLICATION DATA – ERV-F*3
Summer Cooling Performance
(Indoor Design Conditions 75°DB/62°WB)
Ambient
OD
DB/
F VLT VLS VLL HRT HRS HRL V LT VLS VLL HRT HRS HRL V LT VLS VLL HRT HRS HRL
WB
1057570
100
95
90
85
80
757065
19080 12960
65
12960
80
29080
75
19080
70
10980
65
10800
60
10800
80
28080
75
19080
70
10980
65
8640
60
8640
80
28080
75
19080
70
10980
65
6480
60
6480
80
28080
75
19080
70
10980
65
4320
60
4320
75
19080
70
10980
65
3780
60
2160
10980
3780
60
Ventilation Rate 400 CFM
12960 12960 12960
10800 10800 10800 10800 10800
8640 8640 8640 8640 8640
6480 6480 6480 6480 6480
4320 4320 4320 4320 4320
2160 2160 2160 2160
0 0
0
0
63% Efficiency
6120
12020
0
8164
0
8164
17280
17690
8280
12020
180
6717
0
6804
0
6804
19440
17690
10440
12020
2340
6917
0
5443
0
5443
21600
17690
12600
12020
4500
6917
0
4082
0
4082
23760
17690
14760
12020
6660
6917
0
2721
0
2721
16920
12020
8820
6917
1620
2381
0
1360
10980
6917
3780
2381
0
Ventilation Rate 325 CFM
64% Efficiency
3182
3855
15502
10530
4972
9921
8164 8164 8164
6804 6804 6804 6804 6804
5443 5443 5443 5443 5443
4082 4082 4082 4082 4082
2721 2721 2721 2721 2721
1360 1360 1360 1360
0
0
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 3071
0
10530 10530
8775 8775 8775 8775 8775
7020 7020 7020 7020 7020
5265 5265 5265 5265 5265
3510 3510 3510 3510 3510
1755 1755 1755 1755
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
0
2380
0
0
0
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
0
8921
0
3071
0
0
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 1965
0
6739 6739 6739
5616 5616 5616 5616 5616
4492 4492 4492 4492 4492
3369 3369 3369 3369 3369
2246 2246 2246 2246 2246
1123 1123 1123 1123
0 0 0
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 2362
Ventilation Rate 250 CFM
8100 8100 8100
6750 6750 6750 6750 6750
5400 5400 5400 5400 5400
4050 4050 4050 4050 4050
2700 2700 2700 2700 2700
1350 1350 1350 1350
0 0
0
0
65% Efficiency
3825
7751
0
5265
0
5265
10800
11407
5175
7751
112
4460
0
4387
0
4387
12150
11407
6525
7751
1462
4460
0
3510
0
3510
13500
11407
7875
7751
2812
4460
0
2632
0
2632
14850
11407
9225
7751
4162
4460
0
1755 1755
0
10575
7751
5512
4460
1012
1535
0
877
6862
4460
2362
1535
0
0
5265 5265 5265
4387 4387 4387 4387 4387
3510 3510 3510 3510 3510
2632 2632 2632 2632 2632
1755 1755 1755 1755 1755
877 877 877 877
0 0 0
2486
0 0
7019 3363
73
0 0
7897 4241
950
0 0
8774 5118 1828
0 0
9652 5996 2705
0 0
6873 3583
658
0
4460 1535
0
Winter Heating Performance
(Indoor Design Conditions 70°F DB)
Ambient
OD
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
400 CFM 75% Eff. 325 CFM 76% Eff. 250 CFM 77% Eff.
Ventilation Rate
LEGEND:
VLT = Ventilation Load – Total VLS = Ventilation Load – Sensible VLL = Ventilation Load – Latent HRT = Heat Recovery – 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.
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-FC2 W24AB-C W24HB-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: HOLE IN ERV-F MUST
BE USED TO ENSURE CLEARANCE
BE USED TO INSURE CLEARANCE
FROM CONDENSER COIL TUBING
FROM CONDENSER COIL TUBING
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)
250 225 200
400 325 250
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
Loading...