Part #473007
®
Energy Recovery Ventilators
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
could result in personal injury and/or property damage! Retain instructions for future reference.
Model ERVe
General Safety Information
Only qualified personnel should install this system.
Personnel should have a clear understanding of these
instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards.
Other considerations may be required if high winds
or seismic activity are present. If more information
is needed, contact a licensed professional engineer
before moving forward.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electric Code (CEC) in
Canada.
2. All moving parts must be free to rotate without
striking or rubbing any stationary objects.
3. Unit must be securely and adequately grounded.
4. Do not spin fan wheel faster than maximum
cataloged fan RPM. Adjustments to fan speed
significantly effects motor load. If the fan RPM is
changed, the motor current should be checked to
make sure it is not exceeding the motor nameplate
amps.
DANGER
Always disconnect power before working on or near
this equipment. Lock and tag the disconnect switch
or breaker to prevent accidental power up.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
CAUTION
When servicing the unit, the internal components
may be hot enough to cause pain or injury. Allow
time for cooling before servicing.
6. Verify that the power source is compatible with the
equipment.
7. Never open access doors to the unit while it is
running.
CAUTION
Precaution should be taken in explosive
atmospheres.
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1
Table of Contents
Basic Operation
Basic Operation . . . . . . . . . . . . . . 3
Installation
Supplemental Installation, Operation and
Maintenance Manuals . . . . . . . . . . . 3
Installation Concerns. . . . . . . . . . . . 3
Lifting with a Crane / Forklift. . . . . . . . . 4
Roof Curb and Rail Mounting
The ERVe brings in fresh, outdoor air and removes
stale, exhaust air. Prior to discharging the exhaust
air, the energy recovery wheel transfers energy from
the exhaust air to the outdoor air at an effectiveness
of 70-80%. Simply put, this unit preconditions the
outdoor air to save money on heating and cooling
costs.
Recommended Roof Opening . . . . . . . . 4
Roof Curb Mounting . . . . . . . . . . . . 5
Curb Dimensions and Weights . . . . . . . . 5
Ductwork Connections . . . . . . . . . . . 5
Rail Mounting / Layout . . . . . . . . . . . 6
Service Clearances . . . . . . . . . . . . 6
Access Panel Description and Location . . . 6
Dimensional Data . . . . . . . . . . . . . 7
Electrical Information
Enthalpy Wheel
Supply Air to Building
Filters
Outdoor Air Weatherhood
Outdoor Air
Supply
Blower
General Electrical Information . . . . . . . . 8
Control Center Components. . . . . . . . . 9
Electric Heater Application/Operation . . . . . 9
Unit Accessories. . . . . . . . . . . . . . 10
Exhaust Air Damper Installation . . . . . . . 10
Optional Accessories
Exhaust Blower
Return Air from Building
Filters
Exhaust Weatherhood
Exhaust Air
Frost Control Application/Operation . . . . . 11
Economizer Application/Operation . . . . . . 12
Variable Frequency Drives and Wiring . . . .13-14
Typical Wiring Diagram . . . . . . . . . . . 15
Sensors and Lights . . . . . . . . . . . . 16
Remote Control Panel and Wiring . . . . . . 17
Sensors Mounted by Factory . . . . . . . . 18
Sequence of Operation
Supplemental Installation,
Operation and Maintenance
Manuals
Refer to the following Installation, Operation and
Maintenance Manuals for additional details:
Part #462844 — Exhaust Weatherhood
Start-Up
Unit . . . . . . . . . . . . . . . . . . . 19
Optional Accessories . . . . . . . . . . . 20
Fan . . . . . . . . . . . . . . . . . .21-22
Energy Recovery Wheel . . . . . . . . . . 22
Routine Maintenance Checklist
General . . . . . . . . . . . . . . . . . 23
Fan Belts. . . . . . . . . . . . . . . . . 23
Fan Motors . . . . . . . . . . . . . . . . 23
Fan Wheel and Fasteners . . . . . . . . . . 24
Fan Bearings . . . . . . . . . . . . . . . 24
Filters . . . . . . . . . . . . . . . . . . 24
Door Seal Maintenance. . . . . . . . . . . 24
Energy Recovery Wheel Maintenance
Installation
The system design and installation should follow
accepted industry practice, such as described in the
ASHRAE Handbook.
Adequate space should be left around the unit for
filter replacement and maintenance. Sufficient space
should be provided on the side of the unit for routine
service and component removal should that become
necessary.
See Service Clearances and Access Panel Description
sections for more details.
Accessing Energy Recovery Wheel . . . . . 25
Removing Energy Recovery Wheel Segments 25
Cleaning Wheel or Segments . . . . . . . 25
Wheel Belt . . . . . . . . . . . . . . . 25
Wheel Bearing . . . . . . . . . . . . . 25
Parts List . . . . . . . . . . . . . . . . . 26
Sequence of Operation . . . . . . . . . . . 26
Troubleshooting – Airflow. . . . . . . . . . 27
Troubleshooting – Unit . . . . . . . . . 28-29
Maintenance Log . . . . . . . . . . . 30-31
Warranty . . . . . . . . . . . . . Backcover
WARNING
All factory provided lifting lugs must be used when
lifting the unit. Failure to comply with this safety
precaution could result in property damage, serious
injury or death.
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3
Lifting with a Crane
1. Before lifting, be sure that all shipping material
Roof Curb and Rail Mounting
Recommended Roof Opening
has been removed from unit.
2. To assist in determining rigging requirements,
weights are shown below.
A
1.63
1.63
3. Unit must be lifted by all corner lifting points
provided on base structure.
4. Rigger to use suitable mating hardware to attach
to unit corner lifting points.
EXHAUST
INLET
5. Spreader bar(s) must span the unit to prevent
damage to the cabinet by the lift cables.
B
SUPPLY
OUTLET
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
A
B
22
25
27
27
37
44.5
51.5
60
All dimensions are in inches.
6. Always test-lift the unit to check for proper
balance and rigging before hoisting to desired
location.
7. Never lift units by weatherhoods.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
10. Check to be sure that gasketing (supplied by
others) has been applied to the curb prior to
lifting the unit and setting on curb.
Position the unit roof opening such that the supply
discharge and exhaust inlet of the unit will line up
with the corresponding ductwork. Be sure to allow
for the recommended service clearances when
positioning opening (see Service Clearances).
Do not face the outdoor air intake of the unit into
prevailing wind and keep the intake away from any
other exhaust fans. Likewise, position the exhaust
discharge opening away from outdoor air intakes of
any other equipment.
When cutting only duct openings, cut opening 1-inch
(25mm) larger than duct size to allow clearance for
installation. Area enclosed by roof curb must comply
with clearance to combustible materials. If the roof is
constructed of combustible materials, area within the
roof curb must be ventilated, left open, or covered
with non-combustible material which has an “R”
value of at least 5. If area within curb is open, higher
radiated sound levels may result.
Unit Weights (lbs.)
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
Approx. Weight
825
1100
1275
1550
The weights shown are a worst case scenario based
on the sheet metal and component weights for the
unit. These weights include sheet metal weights
added together with the largest motors, blowers and
accessories for the units.
Where the supply or warm air duct passes thru a
combustible roof, a clearance of one inch must be
maintained between the outside edges of the duct
and combustible material in accordance with NFPA
Standard 90A.
Lifting with a Forklift
Unit base rail includes fork-able lifting locations. Use
weights shown to determine forklift size requirements.
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4
Roof Curb Mounting
Curb Outside Dimensions - continued
Roof curb details including duct location dimensions,
are available on Roof Curb Assembly Instructions,
Part Number 472119.
Unit Side
Unit Base
1.895
Rooftop units require curbs to be mounted first. The
duct connections must be located so they will be
clear of structural members of the building.
1. Factory Supplied Roof Curbs: Roof curbs are
Model GKD. The GKD ships in a knockdown
kit (includes duct adapter) and requires field
assembly (by others). Assembly instructions are
included with the GKD curbs.
Insulation Pan
(Insulation not included)
4.844
Roof Curb
1.549
2. Install Curb: Locate curb over roof opening and
fasten in place. (Refer to Recommended Roof
Openings). Check that the diagonal dimensions
are within 1/8 inch of each other and adjust
as necessary. For proper unit operation, it is
important that the installation be level. Shim as
required to level.
3. Install Ductwork: Installation of all ducts should
be done in accordance with SMACNA and AMCA
guidelines. Duct adapter provided to support
ducts prior to setting the unit.
4. Install Insulation: One-inch deep insulation
pans were provided with the curb assembly.
Install insulation prior to setting the unit.
Insulation is not included from the factory.
5. Set the Unit: Lift unit to a point directly above
the curb and duct openings. Guide unit while
lowering to align with duct openings. Roof curbs
fit inside the unit base. Make sure the unit is
properly seated on the curb and is level.
0.775
Curb Cap Details for Factory Supplied Roof Curbs
Ductwork Connections
Examples of poor and good fan-to-duct connections
are shown below. Airflow out of the fan
should be directed straight or curve
the same direction as
the fan wheel rotates.
Poor duct installation
will result in low airflow
and other system
POOR
effects.
Length of Straight Duct
Curb Outside Dimensions and Weights
GOOD
Recommended Discharge Duct Size and Length
Model
Blower Size Duct Size Straight Duct Length
ERVe-20
ERVe-35
ERVe-45
ERVe-55
9
14 x 14
20 x 20
20 x 20
28 x 28
36
36
36
60
10
12
15
W
L
All dimensions shown in inches.
•
Recommended duct sizes are based on velocities across the
cfm range of each model at approximately 800 feet per minute
(FPM) at minimum airflow and up to 1600 fpm at maximum
airflow. Recommended duct sizes are only intended to be a
guide and may not satisfy the requirements of the project.
Refer to plans for appropriate job specific duct size and/or
velocity limitations.
Straight duct lengths were calculated based on 100% effective
duct length requirements as prescribed in AMCA Publication
201. Calculated values have been rounded up to nearest foot.
L
LF
W
WF
Curb Weight
(lbs.)
Unit Size
L
W
LF
WF
•
ERVe-20
ERVe-35
ERVe-45
ERVe-55
61.125 40.375 64.875 44.125
63.375 48.5 67.125 52.25
67.375 55.5 71.125 59.25
93
106
120
148
78.25 65.5
82
69.188
All dimensions are in inches. Weights are for 14-inch high
GKD type curbs.
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Rail Mounting / Layout
Service Clearances
• Rails designed to handle the weight of the ERVe
should be positioned as shown on the diagram
(rails by others).
• Make sure that rail positioning does not interfere
with the supply air discharge opening or the
exhaust air intake opening on the ERVe unit.
Avoid area dimensioned “B” below.
• Rails should extend beyond the unit a minimum
of 12 inches on each side.
ERVe units require minimum clearances to perform
routine maintenance, such as filter replacement,
energy wheel cassette inspection, and fan belt
adjustment. Blower and motor assemblies, energy
recovery wheel cassette and filter sections are always
provided with a service door
or panel for proper
component
access.
B
C
• Set unit on rails.
D
A
D
Recommended Service Clearances
Unit Size
A
B
C
D
ERVe-20
ERVe-35
ERVe-45
ERVe-55
24
32
32
32
24
24
24
24
42
48
54
60
35
43
43
44
All dimensions are in inches.
Isometric view of
ERVe on rails
Access Panel Description and
Location
3
4
2
5
1
B
A
Side view of
ERVe on rails
B
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
A
5.75
5.75
6
Outdoor air filters
Frost control
Outdoor air sensors
18
20.5
22.5
26
1
Preheater and controls
Outdoor air intake damper
6
All dimensions are in inches.
2
3
Supply blower and motor
Electric control center
Main disconnect
Energy wheel cassette
Exhaust air filters
Exhaust air intake damper
4
5
Exhaust blower and motor
Outdoor air intake damper actuator
Model ERVe Energy Recovery Unit
6
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Dimensional Data
D
A
G
RA Intake
H
SA Discharge
B
D
C
EA Discharge
SA Discharge
E
F
RA Intake
B
A
OA Intake
OA Intake
Exhaust Air
Weatherhood
E
Electrical Box
Duct Dimensions
B
C
D
F
G
H
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
A
E
18.0 12.2 10.7 15.8 18.0 10.8 25.8
20.5 13.7 11.9 21.5 20.5 15.8 27.8
22.5 16.1 14.0 24.5 22.5 18.8 29.1
26.0 19.2 16.4 28.0 26.0 23.8 34.8
11.8
13.1
15.8
18.6
C
Outdoor Air
Weatherhood
All dimensions are in inches.
Unit Dimensions
Intake and Discharge Options
B
C
D
E
Top
Side
End
X
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
A
Unit Size
ERVe-20
ERVe-35
ERVe-45
ERVe-55
Bottom
67.0
69.2
72.2
84.1
50.8
60.8
67.1
75.3
46.3
54.4
60.2
71.4
17.8
21.8
21.8
21.8
20.8
17.8
19.2
23.9
X
X
X
X
X
All dimensions are in inches. Door handles, hinges and
other protrusions are not included in the dimensions
above. Dimensions are rounded up to the nearest .1 inch.
OA - Outdoor Air
SA - Supply Air (to the space)
RA - Return Air (from the space)
EA - Exhaust Air
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Electrical Information
CAUTION
The unit must be electrically grounded in accordance
with the current National Electrical Code, ANSI/NFPA
70. In Canada, use current CSA Standard C22.1,
Canadian Electrical Code, Part 1. In addition, the
installer should be aware of any local ordinances or
electrical company requirements that might apply.
System power wiring must be properly fused and
conform to the local and national electrical codes.
System power wiring is to the unit main disconnect
(door interlocking disconnect switch standard
on most units) or distribution block and must be
compatible with the ratings on the nameplate: supply
power voltage, phase, and amperage (Minimum
Circuit Amps - MCA, Maximum Overcurrent Protection
- MOP). All wiring beyond this point has been done
by the manufacturer and cannot be modified without
affecting the unit’s agency / safety certification.
High voltage wiring is run in the top roof panel(s)
of this unit. Do not install sensors or other devices
through the top panel(s).
WARNING
To prevent injury or death due to electrocution or
contact with moving parts, lock disconnect switch
open.
Most factory supplied electrical components are
prewired. To determine what electrical accessories
require additional field wiring, refer to the unit specific
wiring diagram located on the inside of the unit
control center access door. The low voltage control
circuit is 24 VAC and control wiring should not exceed
0.75 ohms.
Refer to Field Control Wiring Length/Gauge table for
wire length maximums for a given wire gauge.
If field installing an additional disconnect switch, it
is recommended that there is at least four feet of
service room between the switch and system access
panels. When providing or replacing fuses in a fusible
disconnect, use dual element time delay fuses and
size according to the rating plate.
Field Control Wiring Length/Gauge
Total
Wire Length
Minimum
Wire Gauge
125 ft.
200 ft.
300 ft.
450 ft.
18
16
14
12
If power supply is desired through bottom of unit, run
the wiring through the curb, cut a hole in the cabinet
bottom, and wire to the disconnect switch. Seal
penetration in cabinet bottom to prevent leakage.
Control wires should not be run inside the same
conduit as that carrying the supply power. Make sure
that field supplied conduit does not interfere with
access panel operation.
The electric supply to the unit must meet stringent
requirements for the system to operate properly.
Voltage supply and voltage imbalance between
phases should be within the following tolerances.
If the power is not within these voltage tolerances,
contact the power company prior to operating the
system.
If wire resistance exceeds 0.75 ohms, an industrial-
style, plug-in relay should be added to the unit
control center and wired in place of the remote
switch (typically between terminal blocks R and G
on the terminal strip (refer to Typical Control Center
Components). The relay must be rated for at least
5 amps and have a 24 VAC coil. Failure to comply
with these guidelines may cause motor starters to
“chatter” or not pull in which can cause contactor
failures and/or motor failures.
Voltage Supply: See voltage use range on the rating
plate. Measure and record each supply leg voltage at
all line disconnect switches. Readings must fall within
the allowable range on the rating plate.
Voltage Imbalance: In a 3-phase system, excessive
voltage imbalance between phases will cause motors
to overheat and eventually fail. Maximum allowable
imbalance is 2%. To determine voltage imbalance,
use recorded voltage measurements in this formula.
Key:
V1, V2, V3 = line voltages as measured
VA (average) = (V1 + V2 + V3) / 3
VD = Line voltage (V1, V2 or V3) that
deviates farthest from average (VA)
Formula: % Voltage Imbalance = [100 x (VA-VD)] / VA
CAUTION
If any of the original wire as supplied with the
appliance must be replaced, it must be replaced
with wiring material having a temperature rating of
at least 105ºC.
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8
Typical Control Center Components
Electric Heater Application/Operation
Factory installed electric heaters can be provided for
preheat frost control. An electric preheater warms
the outdoor air prior to the energy recovery wheel
to prevent frosting on the wheel. Electric heaters
are available in 208, 230, or 460 VAC (refer to heater
nameplate for voltage).
1. Main Disconnect (non-fusible, lockable)
2. Motor Starter – Exhaust Air Fan
3. Motor Starter – Outdoor Air Fan
4. Motor Contactor – Energy Wheel
5. 24 VAC Control Transformer
6. 24 VAC Terminal strip
7. Fuses for blower motors
Preheaters: Preheaters are standard as single-stage
on/off control. Preheaters are single point wired at
the factory. A thermodisc temperature sensor (with
a 5°F set point) is mounted in the outdoor airstream
after the preheater to turn the preheater on. See Frost
Control Application/Operation for typical set points.
If the temperature falls below the set point and the
wheel pressure drop sensor is triggered, the preheater
will turn on.
5
1
6
7
Access to the preheater
control panel is through
the outdoor air filter
door.
2
3
4
Exploded Detail
of Terminal Strip
Access to Control Center Components
is gained through the access panel indicated.
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Unit Accessories
Exhaust Air Damper Installation
Instructions (bottom return air intake
configuration only)
Outdoor Air Weatherhood
Outdoor air weatherhood will be
factory mounted.
1. Open the exhaust air filter and wheel access door.
Exhaust Weatherhood
The exhaust weatherhood is
shipped separately as a kit with
its own instructions.
2. Remove exhaust air filters and possibly the energy
wheel for more working area inside the unit.
3. Remove the two screws holding the damper in
place as shown (save screws for step 7).
Dampers
Backdraft dampers are always
included as an integral part of
the exhaust hood assemblies.
Motorized outdoor air and exhaust
air dampers are optional. Outdoor
air dampers are factory mounted
and wired at the intake. Exhaust
air dampers, depending on the
unit configuration, may require
final installation. If your unit is
Shipping Location
configured as return air intake on
4. Bend the brackets holding the damper out and
away from the damper as shown in the Part
Removal drawing. Use caution while executing this
step, as the damper is heavy. Guide it into place
gently and avoid dropping it, as damage may
occur.
the end of the unit, the exhaust air damper is factory
installed and wired. If your unit is configured with
the return air intake location on the bottom, final
installation is required per the instructions provided.
Step 4
Step 5
Step 4
Part Removal
5. Once the damper is positioned as shown in the
Part Removal drawing, remove the four (4) screws
holding the shipping brackets in place.
6. Remove the shipping brackets and discard.
7. Insert screws removed in step 3 through the
damper flange in the same location they were
removed from.
Final Installation
Model ERVe Energy Recovery Unit
10
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•
•
After testing, set the Timer Scale as follows:
Optional Accessories
T1 = 10 minutes, T2 = 1 hour
Frost Control Application/Operation
Set the Timer Settings as follows:
T1 = 0.5, T2 = 0.5
The timer is now set for 5 minutes off and 30
minutes on. Remember to remove the jumper.
Extremely cold outdoor air temperatures can cause
moisture condensation and frosting on the energy
recovery wheel. Frost control is an optional feature
that will prevent/control wheel frosting. Three options
are available:
Electric preheat frost control includes an electric
heater (at outdoor air intake), an airflow pressure
switch and thermodisc temperature sensor (located
at the preheater) in addition to a pressure sensor
across the energy wheel. (Refer to Electric Heater
Application/Operation for electric preheater location).
When electric preheat frost control is initiated, the
electric preheater will turn on and warm the air
entering the energy wheel to avoid frosting. The
thermodisc temperature sensor installed has a 5°F
nonadjustable set point. For custom temperature set
point thermodiscs, please contact the factory. Use the
following test procedure for troubleshooting.
1. Timed Exhaust frost control
2. Electric preheat frost control
3. Modulating wheel frost control
All of these options are provided with a thermostat
(with probe) mounted in the outdoor air intake
compartment and a pressure sensor to monitor
pressure drop across the wheel.
Frost Threshold Temperatures
Indoor RH @ 70°F
Frost Threshold Temp
20%
30%
40%
-10º F
-5º F
0º F
Testing:
•
Jumper out the thermodisc temperature sensor
and the wheel pressure sensor. The heater should
turn on.
The typical temperature setting corresponds to the
indoor air relative humidity as shown in the Frost
Threshold Temperatures Table and represents when
frost can occur. An increase in pressure drop would
indicate that frost is occurring. Both the pressure
sensor AND the outdoor air temperature sensor
must trigger in order to initiate frost control. The
two sensors together ensure that frost control is
only initiated during a real frost condition. Field
wiring of a light (or other alarm) between 6 & C in
the control center will notify personnel when unit is
in frost control mode (refer to Remote Panel Wiring
schematics section for wiring details). The following
explains the three options in more detail.
•
If it doesn’t, either put the outdoor air side doors
on or temporarily jumper the airflow pressure
switch in the preheater control center to avoid
nuisance tripping of the pressure switch. Also
check the airflow switch pressure tap located
at the supply discharge blower to ensure the
tubing is connected and the tap is not blocked.
Remember to remove the jumpers.
Modulating wheel frost control includes a variable
frequency drive in addition to the thermostat and
pressure sensor. When modulating wheel frost control
is initiated, the variable frequency drive will reduce
the speed of the wheel. Reducing the speed of the
energy wheel reduces its effectiveness, which keeps
the exhaust air condition from reaching saturation,
thus, eliminating condensation and frosting. If the
outdoor air temperature is greater than the frost
threshold temperature OR the pressure differential
is less than the set point, the wheel will run at full
speed. If the outdoor air temperature is less than
the frost threshold temperature AND the pressure
differential is greater than the set point, the wheel will
run at reduced speed until the pressure differential
falls below the set point. The temperature and
pressure differential set points are set at the factory,
but are field-adjustable (refer to VFD section for more
information). The variable frequency drive will be fully
programmed at the factory.
Timed exhaust frost control includes a timer in
addition to the thermostat and wheel pressure sensor.
When timed exhaust frost control is initiated, the
timer will turn the supply blower on and off to allow
the warm exhaust air to defrost the energy recovery
wheel. Default factory settings are 5 minutes off and
30 minutes on. Use the following test procedure for
troubleshooting.
Testing (refer to Timer Faceplate drawing below)
•
Jumper the wheel
A1
B1
15
pressure switch in the
unit control center. Set
the Timer Scale for T1
and T2 to 1 minute. Set
the Timer Settings for
T1 and T2 to 1.0. Set the
dip switch to the down
position. (normal position)
0.8 0.6
1.0 0.4
0.2
Dip
Switch
0
T2
1 MIN T2
Timer
Scale
1 MIN T1
0.8 0.6
1.0 0.4
0.2
0
T1
16
18
A2
•
Turn the temperature
sensor up as high as
possible. The supply blower should cycle on for
one minute, then turn off for one minute.
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11
should not light and the energy recovery wheel
should energize and rotate.
If these steps provide the results described, the
enthalpy economizer is working properly.
Economizer Application/Operation
The energy recovery wheel operation can be altered
to take advantage of economizer operation (free
cooling). Two modes are available:
1. De-energizing the wheel
2. Modulating the wheel
•
Turn unit power off. Reconnect C7400 Solid State
Enthalpy Sensor to terminal SO.
A field supplied call for cool (Y1) is required.
Modulating the Wheel
In applications in which an internal heat gain is
present in the space, the rotational speed of the
energy wheel may be modulated (via variable
frequency drive) to avoid overheating the space
during the winter. The speed of the energy wheel
will be controlled in response to the discharge
temperature set point.
De-energizing the wheel is accomplished with a signal
from a Temperature or Enthalpy sensor mounted
in the air intake compartment. This primary sensor
will de-energize the energy wheel when the outdoor
air temperature (factory default is 65ºF) or enthalpy
(factory default is the ‘D’ setting) is below the field
adjustable set point. An Override temperature
sensor is also furnished in the outdoor air intake
compartment to deactivate economizer mode. The
Override (with field adjustable set point) is set at
some temperature lower than the primary sensor
(factory default is 50ºF). Effectively, the two sensors
create a deadband where the energy recovery wheel
will not operate and free cooling from outside can be
brought into the building unconditioned.
Sequence of Operation: The variable frequency
drive is fully programmed at the factory (refer to VFD
section for more information). A “call for cool” must
be field wired to the unit (terminals provided in unit -
refer to wiring diagram in unit control center) to allow
for initiation of economizer mode. When the space
calls for cooling, factory supplied controls will drive
the following wheel operations:
Testing
Wheel runs at full speed.
TAO > TRA
Temperature Sensor with Override
(maximum energy recovery)
•
Turn both Temperature and
Override thermostats down as
low as they go. The wheel should
be rotating.
T
AO < TRA
and
Wheel is stopped.
(no energy recovery)
T
AO > TSA
TAO < TRA
and
T
Wheel will modulate to maintain
discharge temperature.
•
Turn the Temperature sensor
up as high as it goes, and keep
the Override sensor as low as it
will go. The wheel should stop
rotating.
Temperature
Sensor with
Override
AO < TSA
Where (T ) is the outdoor air temperature set point,
(T ) is the return air temperature set point, and (T
OA
)
RA
SA
•
•
Turn both sensors as high as they will go. The
wheel should start rotating.
is the supply air discharge thermostat set point.
Set the Temperature sensor at desired point
for economizer operation to begin. Set the
Override sensor at desired point for economizer
operation to end (factory default is 65ºF and 50ºF,
respectively).
Enthalpy Sensor with Override
•
Turn unit power off. Disconnect
C7400 Solid State Enthalpy Sensor
from terminal So on the enthalpy
controller. Also, disconnect the
620 ohm resistor from
terminal Sr on the
enthalpy controller.
Turn unit power on. The
LED on the enthalpy
Enthalpy
Sensor with
Override
controller should light and the energy
recovery wheel should not rotate.
• Turn unit power off. Reconnect 620
ohm resistor to terminal Sr on the
enthalpy controller. Turn unit power
on. The LED on the enthalpy controller
Enthalpy
Controller
Model ERVe Energy Recovery Unit
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Variable Frequency Drives for Energy Recovery Blowers
Optional factory installed, wired, and programmed variable frequency drives (VFDs) may have been provided
for modulating or multispeed control of the blowers. One VFD is provided for each blower (supply air and
exhaust). The VFD’s provided are either Yaskawa model V1000 or J1000. Refer to the tables in this section for
factory settings and field wiring requirements. Refer to the unit control center for unit specific wiring diagram (an
example wiring diagram has been provided in this manual for reference). When making adjustments outside of
the factory set points, refer to Yaskawa VFD instruction manual, which can be found online at www.drives.com.
For technical support, contact Yaskawa direct at 1-800-927-5292.
R+ R- S+ S- IG
P1 P2 PC A1 A2 +V AC AM AC MP
S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP MA MB MC
S1 S2 S3 S4 S5 SC A1 +V AC AM AC
MA MB MC
J1000
V1000
Factory Set Points
Variable Frequency Drives (VFDs) for the blowers are
factory setup to operate in one of the three following
modes:
OPTION 1 - 0-10 VDC CONTROL
USER TO PROVIDE ISOLATION AS REQUIRED
Modulating: 0-10 VDC signal wired in the field by
others varies the speed of the blower between 30
and 60Hz
0-10 VDC CONTROL SIGNAL (BY OTHERS)
WIRED TO A1 (+) AND AC (COMMON)
0 VDC=30 Hz
A1 AC
10 VDC=60 Hz
Multispeed: Digital contact closures by others
command the VFD to run at multiple speed settings:
• SC to S4 - Drive runs at 40Hz
FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
• SC to S5 - Drive runs at 30Hz
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V.
CO Sensor: A digital contact closure from an
2
optional factory provided CO sensor sends the
2
VFD to high or low speed depending on CO ppm
levels at the sensor.
2
OPTION 2 - MULTI SPEED CONTROL
USER TO PROVIDE CONTACTS AND ISOLATION
AS REQUIRED
The terminal locations for Modulating (option 1) and
Multi-speed (option 2) are shown on the left. Most
of the set points in the VFDs are Yaskawa factory
defaults. However, a few set points are changed at
Greenheck and are shown in the tables on the next
page. These settings are based on the VFD mode
selected.
To gain access to change set points on the V1000 and
J1000 drives, parameter A1-01 needs to be set at “2”.
To prevent access or tampering with drive settings on
either drive, change parameter A1-01 to “0”.
NEITHER S4 OR S5 CONTACT CLOSED
S4 S5 SC
DRIVE SPEED = 60 Hz.
S4 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 40 Hz.
S5 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 30 Hz.
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.
PARAMETER A1-01 CHANGE TO 2
PARAMETER d1-01 FOR NEW 60Hz SETTING
PARAMETER d1-02 FOR NEW 40Hz SETTING
PARAMETER d1-03 FOR NEW 30Hz SETTING
PARAMETER A1-01 CHANGE TO 0
Drive Operation
SC to S1 contact for On/Off
A1 (0-10 VDC) referenced to AC. Can use +15 VDC
from +V
Model ERVe Energy Recovery Unit
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13
Factory Set Points - continued
CO SENSOR CONTROL FOR FAN SPEED
2
Resetting the V1000 drive to factory defaults
To reset the V1000 drive back to Greenheck factory
defaults go to parameter A1-01 and set it to “2”.
Then go to A1-03 and change it to “1110” and press
enter. The drive is now reset back to the settings
programmed at Greenheck. This option is not
available on the J1000.
(1/2 SPEED WHEN C0 DROPS bELOW 700 PPM)
2
(FULL SPEED WHEN C0 RISES AbOVE 800 PPM)
2
Setting
Parameter
V1000
J1000
A1-01
Access Level
2
0
1
2
0
1
b1-01 Reference Source (Frequency)
b1-17
C1-01
C1-02
C6-02
d1-01
d1-02
d2-02
VFD Start-Up Setting
Acceleration Time
Deceleration Time
Carrier Frequency
30 sec. 30 sec.
30 sec. 30 sec.
MODULATING CONTROL FOR FAN SPEED
(0-10 VDC)
1
1
Setting
Parameter
Frequency Reference 1
Frequency Reference 2
Ref Lower Limit
60 Hz
30 Hz
50%
30 Hz
60 Hz
50%
V1000
J1000
A1-01
b1-17
C1-01
C1-02
C6-02
d2-02
Access Level
VFD Start-Up Setting
Acceleration Time
Deceleration Time
Carrier Frequency
Ref Lower Limit
2
1
2
1
Motor
FLA
Motor
FLA
30 sec. 30 sec.
30 sec. 30 sec.
E2-01
Motor Rated FLA
H3-10
A1-01
A2 Not Used
Access Level
F
0
NA
0
1
1
50%
Motor
FLA
50%
Motor
FLA
Variable Frequency Drives for Energy
Recovery Wheel
E2-01
Motor Rated FLA
H3-04
A1-01
Terminal A1 Bias
Access Level
50%
50%
Optional factory installed VFD for the energy recovery
wheel is programmed at the factory per the settings
shown below for economizer and frost control modes.
The VFD provided is a Yaskawa model J1000. Refer
to the VFD instruction manual that ships with the unit
when making adjustments.
0
0
MULTI-SPEED CONTROL FOR FAN SPEED
(1/3 OR 1/2 SPEED REDUCTION)
Setting
Parameter
Parameter
Access Level
Setting – J1000
V1000
J1000
A1-01
b1-17
C6-02
d2-01
d2-02
E2-01
2
A1-01
Access Level
2
0
1
2
0
1
VFD Auto Start
Carrier Frequency
Ref Upper Limit
Ref Lower Limit
Motor Rated FLA
1
b1-01 Reference Source (Frequency)
2
40% or 50%*
5%
b1-17
C1-01
C1-02
C6-02
d1-01
d1-02
d1-03
d1-04
d2-02
VFD Start-Up Setting
Acceleration Time
30 sec. 30 sec.
30 sec. 30 sec.
Deceleration Time
Motor FLA
Must be less
than FLA
Carrier Frequency
1
1
E2-03
H1-02
H2-01
Motor No-Load Current
Frequency Reference 1
Frequency Reference 2
Frequency Reference 3
Frequency Reference 4
Ref Lower Limit
60 Hz
40 Hz
30 Hz
60 Hz
50%
60 Hz
40 Hz
30 Hz
60 Hz
50%
Multi-Function Input
(Terminal S2)
Multi-Function Output
(MA, MB, MC)
6
5
Setting
Motor
FLA
Motor
FLA
Economizer Signal Source
(0-10 VDC)
E2-01
H1-04
H1-05
H1-06
Motor Rated FLA
Honeywell
Carel
Module Controller
Multi-Function Input Sel 4
(Terminal S4)
3
4
5
3
4
Analog Frequency Reference
H3-03
0
100
0
(Gain)
Multi-Function Input Sel 5
(Terminal S5)
Analog Frequency Reference
H3-04
(Bias)
99
Multi-Function Input Sel 6
(Terminal S6)
NA
L1-01
L4-01
A1-01
Elect Thermal Overload
Frequency Detection Level
Access Level
2
15
0
H3-10
A1-01
A2 Not Used
Access Level
F
0
NA
0
*30 through 64 inch wheels are 40% (24 Hz)
74 inch wheel is 50% (30 Hz)
Model ERVe Energy Recovery Unit
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Typical Wiring Diagram
Following is an example of a typical wiring diagram located in the unit control center. This wiring diagram
includes a legend highlighting which accessories were provided with the unit. Factory wiring and field wiring
are also indicated. This particular example includes 1) variable frequency drives on the blowers requiring a
modulating input, 2) modulating energy recovery wheel with factory controls for economizer, 3) energy recovery
wheel rotation sensor, 4) outdoor air and exhaust air dirty filter switches, 5) motorized outdoor air and exhaust
air intake dampers, and 6) timed exhaust frost control. Many other factory installed and wired accessories are
available.
DS1
L1
T1
T2
T3
L1
VFD-E
MAIN POWER
TO UNIT
L2
L3
LEGEND
L2
L3
S1 SC FR FC
R3
CC COMPRESSOR CONTACTOR
CF CONDENSING FAN CONTACTOR
CH COMPRESSOR SUMP HEATER
EXHAUST FAN
MOTOR
GROUND
1
3
0-10 VDC
D
DAMPER
*
T1
T2
T3
L1
VFD-S
DB POWER DISTRIBUTION BLOCK
DL DAMPER LIMIT SWITCH
DS DISCONNECT SWITCH
EC ECONOMIZER CONTROLLER
FCS CONDENSOR FAN CYCLE SWITCH
FU FUSES
L2
L3
*
*
S1 SC FR FC
R4
SUPPLY FAN
MOTOR
1
3
0-10 VDC
FU5 CONTROL TRANSFORMER FUSES (NOT ON CLASS II)
FZ1 FREEZE PROTECTION
HPS HIGH PRESSURE SWITCH (MANUAL RESET)
LPS LOW PRESSURE SWITCH
PS1 WHEEL FROST PRESSURE SWITCH
PS2 SUPPLY DIRTY FILTER PRESSURE SWITCH
PS3 EXHAUST DIRTY FILTER PRESSURE SWITCH
R1 ENERGY WHEEL RELAY/CONTACTOR
R2 OCCUPIED/UNOCCUPIED RELAY
R3 EXHAUST BLOWER VFD RELAY
R4 SUPPLY BLOWER VFD RELAY
R5 MODULATING WHEEL FROST CONTROL RELAY
R6 ECONOMIZER RELAY
*
L1
L2
L3
S1
T1
T2
T3
VFD-W
*
*
*
*
ENERGY WHEEL
SC
FR FC MA MC
R1
SEE BELOW FOR
TERMINAL CONNECTIONS
3
4
*
*
FU5
TR1
R7 COMPRESSOR INTERLOCK RELAY
R8 EVAP RELAY (INDIRECT)
R9 EVAP RELAY (DIRECT)
R10 UNIT RELAY
S1 FAN SWITCH
S2 ROTATION SENSOR REED SWITCH
S3 ROTATION SENSOR REED SWITCH
S4 CALL FOR HEAT SWITCH
MULTI-VOLTAGE PRIMARY
24 SECONDARY
o
*
R
C
S5 BYPASS SWITCH
o
S6 CALL FOR COOL SWITCH (FIRST STAGE)
S7 CALL FOR COOL SWITCH (SECOND STAGE)
ST MOTOR STARTER
T1 FROST CONTROL TIMER
TYPICAL SETTINGS t1(OFF) = 5 MIN., t2(ON) = 30 MIN.
T2 ROTATION SENSOR TIMER
*
*
S1
EXHAUST DAMPER
D1
R3
G
*
T3 ROTATION SENSOR TIMER
T4 ECONOMIZER WHEEL JOG TIMER
TYPICAL SETTINGS t1(OFF) = 3 HRS., t2(ON) = 10 SEC.
T5 EVAP DELAY OFF TIMER
VFD-E O.L.
MB MC
EXHAUST FAN
2
7
T6 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)
T7 COMPRESSOR MINIMUM OFF TIMER (TYP. 3 MIN.)
TR TRANSFORMER
TS1 FROST CONTROL THERMOSTAT (JUMPER - HEAT )
CLOSES ON TEMP. DECREASE TYPICAL SETTING 5 F.
*
*
SUPPLY DAMPER
D2
R4
R1
4
º
TS2 ECONOMIZER LOW LIMIT THERMOSTAT (JUMPER - HEAT )
VFD-S O.L.
R3
T1
º
º
OPENS ON TEMP. DECREASE TYP. SETTING 20 OFFSET OR 50 F.
SUPPLY FAN
TS3 ECONOMIZER UPPER LIMIT THERMOSTAT (JUMPER - HEAT)
6
8
16
2
7
15
MB
MC
º
º
CLOSES ON TEMP. DECREASE TYP. SETTING 65 F./2 DIFF.
TS4 ROOM OVERRIDE SENSOR
TS5 INLET AIR POST HEATER LOCKOUT THERMOSTAT (AFTER WHEEL)
CLOSES ON TEMP. DECREASE TYPICAL SETTING 65 F.
TS6 INLET AIR COMPRESSOR LOCKOUT THERMOSTAT (JUMPER-HEAT)
OPENS ON TEMP. DECREASE TYPICAL SETTING 60 F./2 DIFF.
ENERGY WHEEL
ROTATION SENSOR
º
A2
A1
TO MA AND MC
ON VFD-W
MA
º
º
MC
1
C
S2
T2
6
2
NC
12
FACTORY SUPPLIED AND WIRED
*
o
FIELD WIRED
OA-SENSOR
SENSOR
FIELD CONTROL WIRING RESISTANCE SHOULD NOT EXCEED 0.75 OHM. IF
RESISTANCE EXCEEDS 0.75 OHM THEN CONSULT FACTORY. USE 14 GAUGE
MINIMUM WIRE THICKNESS FOR CONTROL WIRING.
24 VAC
THERMOSTAT(S) TS1,
COM
THERMOSTAT CONTROLLER(S)
FROST CONTROL
B1
PS1
NO
TS1
REPLACEMENT FUSES: MUST HAVE A MINIMUM I.R. RATING OF 5 KA
6
T1
C
COM
NO
A1
A2
CAUTION:
UNIT SHALL BE GROUND IN ACCORDANCE WITH N.E.C.
POWER MUST BE OFF WHILE SERVICING.
S6
Y1
ECONOMIZER CONTROL
TR
1
TR1
EC
+
-
FR
FC
TO FR AND FC
ON VFD-W
2-10V
USER INTERFACE CONNECTIONS:
SR
SR+
SO
SO+
T
T1
620 OHM RESISTOR OR
RETURN AIR SENSOR
USER TO VERIFY THAT TR1 CAN HANDLE THE VA LOAD OF INDICATOR DEVICES.
DIRTY FILTER INDICATOR SHOWN AS 24V POWER FROM UNIT.
PS2
OUTDOOR AIR
SENSOR
5
2
MIXED AIR
SENSOR
C
NC
NO
SUPPLY DIRTY
FILTER SWITCH
R
C
PS3
4
3
C
NC
NO
EXHAUST DIRTY
FILTER SWITCH
R
C
C
FROST CONTROL INDICATOR
ROTATION INDICATOR
6
12
C
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15
Rotation Sensor
CO Sensor
2
The rotation sensor monitors energy recovery wheel
rotation. If the wheel should stop rotating, the sensor
will close a set of contacts in the unit control center.
Field wiring of a light (or other alarm) between
terminals R & 12 in the unit control center will notify
maintenance personnel when a failure has occurred.
(Refer to Remote Panel Wiring Schematics section for
wiring details).
This accessory is often used to provide a modulating
control signal to a variable frequency drive to raise
and lower airflow in relationship to the CO levels
2
in the space. This strategy is often referred to as
Demand Control Ventilation and provides further
energy savings to the system. Follow instructions
supplied with sensor for installation and wiring details.
Service Outlet
Dirty Filter Sensor
120 VAC GFCI service outlet ships
loose for field installation. Requires
separate power source so power is
available when unit main disconnect is
turned off for servicing.
Dirty filter sensors monitor pressure drop across the
outdoor air filters, exhaust air filters or both. If the
pressure drop across the filters exceeds the set point,
the sensor will close a set of contacts in the unit
control center. Field wiring of a light (or other alarm)
to these contacts will notify maintenance personnel
when filters need to be replaced.
Vapor Tight Lights
Vapor tight lights provide light to each of the
compartments in the energy
The switch has not been set at the factory due to
external system losses that will affect the switch. This
switch will need minor field adjustments after the unit
has been installed with all ductwork complete. The
dirty filter switch is mounted in the unit control center.
recovery unit. The lights are wired
to a junction box mounted on the
outside of the unit. The switch to
turn the lights on is located in the
unit control center. The switch
requires a separate power source
to allow for power to the lights
when the unit main disconnect is
off for servicing.
To adjust the switch, the unit must be running with
all of the access doors in place. The adjusting
screw is located on the top of the switch. Open the
filter compartment and place a sheet of plastic or
cardboard over 50% of the filter media. Replace
the filter compartment door. Check to see if there is
power at the alert signal leads. (Refer to electrical
diagram).
Whether there is power or not, turn the adjustment
screw on the dirty filter gauge (clockwise if you did
not have power, counterclockwise if you did have
power) until the power comes on or just before the
power goes off. Open the filter compartment and
remove the obstructing material. Replace the door
and check to make sure that you do not have power
at the alert signal leads. The unit is now ready for
operation.
Setscrew (on front of switch) must
be manually adjusted after the
system is in operation.
Negative pressure connection
is toward the ‘front or top’ of
the switch. (senses blower side
of filters)
Positive pressure connection is toward the ‘back or
bottom’ of the switch. (senses air inlet side of filters)
Model ERVe Energy Recovery Unit
16
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Indicator Lights powered by the ER Unit
Remote Control Panel and Wiring
Schematics
The remote panel is a series of junction boxes ganged
together and includes a stainless steel faceplate. The
remote panel is available with a number of different
alarm lights and switches to control the unit. The
remote panel ships loose and requires mounting and
wiring in the field
R
C
Unit On/Off
G
Y1
Y2
W1
Frost Control
6
Economizer
Rotation Sensor
7
The remote panel is available with the following
options:
12
• Unit on/off switch
• Unit on/off light
PS2
NC
C
NO
Supply Dirty Filter
Exhaust Dirty Filter
• 7-day time clock
• Hand/off/auto switch
• Time delay override
• Economizer light
PS3
NC
C
NO
• Frost control light
• Exhaust air dirty filter light
• Outdoor air dirty filter light
• Wheel rotation sensor light
Refer to Electrical Connections section for Field Control
Wiring recommendations.
Dirty Filter Indicator (power by others)
7-Day Timer or On/Off Switch
PS2
Supply Dirty Filter
Exhaust Dirty Filter
NC
C
NO
7-Day Timer
R
PS3
Terminal Block
NC
C
NO
C
G
in Unit
Control Center
S1 - Unit On/Off
Hot
L1
Refer to Pressure Switch for voltage and load ratings.
For 7-Day Timer, use blue and black wires.
Red wires should be capped off.
Hand/Off/Auto Switch
R
Terminal Block
C
G
in unit
On
Control Center
Off
Auto
BMS
Hand/Off/Auto Switch allows the unit to
“Off” - off
“On” - Manual Operation
“Auto” - Unit is controlled by BMS, RTU, etc.
NOTE: RTU controllers are by others.
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17
Sensors Mounted by Factory
Factory mounted temperature, pressure, and current sensors are available in the locations indicated on the unit
diagram below. A list of available sensors is shown below. The specific sensors provided on a given unit are
labeled in the unit control center on the terminal strip. Sensors are wired to the terminal strip to make it easy for
the controls contractor to connect the Building Management System for monitoring purposes.
EW-P
RAF-P
EF-A
EAW
RAI
RA
FILTER
TO
OUTSIDE
FROM
INSIDE
EXHAUST
BLOWER
OAF-P
OAI
OAAW
OAF-A
OA
FILTER
FROM
OUSTIDE
TO
INSIDE
SUPPLY
BLOWER
OAD
OAW-P
Temperature Sensors - 1K Ohm RTD
Drawing Labels Terminal Strip Labels
OAI
OA/Supply Inlet Temp
OA After Wheel
OAAW
RAI
RA/Exhaust Inlet Temp
Supply Discharge Temp
Exhaust After Wheel Temp
OAD
EAW
Pressure Sensors (analog or digital)
Drawing Labels Terminal Strip Labels
OAF-P
OAW-P
RAF-P
EW-P
OA/Supply Filter Pressure
Outdoor Air Wheel Pressure
RA/Exhaust Filter Pressure
Exhaust Wheel Pressure
Amp - Current Sensors (analog or digital)
Drawing Labels Terminal Strip Labels
OAF-A
EF-A
Supply Fan Amps
Exhaust Fan Amps
Model ERVe Energy Recovery Unit
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o Rotate the fan wheels and energy recovery wheels
by hand and ensure no parts are rubbing. If
rubbing occurs, refer to Start-Up section for more
information.
Start-Up
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit
to OFF at disconnect switch(es). Unit may have
multiple power supplies.
o Check the fan belt drives for proper alignment
and tension (refer to Start-Up section for more
information).
o Filters can load up with dirt during building
construction. Replace any dirty pleated filters and
clean the aluminum mesh filters in the intake hood
(refer to Routine Maintenance section).
WARNING
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
o Verify that non-motorized dampers open and close
properly.
o Check the tightness of all factory wiring
connections.
Do not operate energy recovery ventilator without
the filters and birdscreens installed. They prevent
the entry of foreign objects such as leaves, birds,
etc.
o Verify control wire gauge (refer to the Electrical
Connections section).
o Verify diameter seal settings on the energy
recovery wheel (refer to Start-Up section for more
information).
CAUTION
o Install exhaust inlet motorized damper (see Unit
Do not run unit during construction phase. Damage
to internal components may result and void
warranty.
Accessories section)
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
• Thermometer
• Tachometer
• Incline manometer or equivalent
General Start-Up Information
Every installation requires a comprehensive start-
up to ensure proper operation of the unit. As part
of that process, the following checklist must be
completed and information recorded. Starting up
the unit in accordance with this checklist will not
only ensure proper operation, but will also provide
valuable information to personnel performing future
maintenance. Should an issue arise which requires
factory assistance, this completed document
will allow unit experts to provide quicker resolve.
Qualified personnel should perform start-up to ensure
safe and proper practices are followed.
Start-Up Checklist
The unit will be in operational mode during start-up.
Use necessary precautions to avoid injury. All data
must be collected while the unit is running. In order to
measure volts & amps, the control center door must
be open, and the unit energized using a crescent
wrench to turn the disconnect handle.
Check line voltage at unit disconnect
_______ L1-L2 volts
Unit Model Number _______________________________
(e.g. ERVe-20)
_______ L2-L3 volts
_______ L1-L3 volts
Unit Serial Number _______________________________
(e.g. 10111000)
Motor Amp Draw
Energy Wheel Date Code __________________________
(e.g. 0450)
• Supply Fan
• Exhaust Fan
_______ L1 amps
_______ L2 amps
_______ L3 amps
______ L1 amps
______ L2 amps
______ L3 amps
Start-Up Date
_______________________________
Start-Up Personnel Name__________________________
Start-Up Company _______________________________
• Energy Wheel
Phone Number
_______________________________
_______ L1 amps
_______ L2 amps
_______ L3 amps
Pre Start-Up Checklist – check as items are
completed.
o Disconnect and lock-out all power switches
Fan RPM
o Remove any foreign objects that are located in the
_______ Supply Fan ______ Exhaust Fan
energy recovery unit.
Correct fan rotation direction
o Check all fasteners, set-screws, and locking collars
on the fans, bearings, drives, motor bases and
accessories for tightness.
Supply Fan
Exhaust Fan
Yes / No
Yes / No
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Optional Accessories Checklist
Refer to the respective sections in this Installation, Operation and Maintenance Manual for detailed information.
Refer to wiring diagram in unit control center to determine what electrical accessories were provided.
Provided with Unit? Frost Control Application / Operation section:
Setting
Factory Default
Yes
Yes
No
No
Frost Control set point
Differential
5ºF
2ºF
Timer
Refer to IOM
Refer to IOM
Frost Control Modulating
Economizer Application / Operation section:
Yes
No
Economizer (temperature)
Set point
65ºF
20ºF
2ºF
Offset
Differential
Yes
Yes
No
No
Economizer (enthalpy)
Set point
D
Economizer (modulating)
Refer to IOM
Optional Accessories section:
Operational
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Wheel Rotation Sensor
OA Dirty Filter Sensor
EA Dirty Filter Sensor
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
N/A
N/A
N/A
N/A
N/A
N/A
N/A
CO Sensor
2
Service Outlet
Vapor Tight Lights
Remote Control Panel
Variable Frequency Drives section:
Operational
Yes
Yes
No
No
Blower VFDs
Wheel VFD
Yes
Yes
No
No
N/A
N/A
Damper section:
Operational
Yes
Yes
No
No
Outdoor Air Damper
Exhaust Air Damper
Yes
Yes
No
No
N/A
N/A
Model ERVe Energy Recovery Unit
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5. Place belts over sheaves. Do not pry or force
belts, as this could result in damage to the cords
in the belts.
Unit Start-Up
Refer to Parts List section for component locations.
Fans
6. With the fan off, adjust the belt tension by moving
the motor base. (See belt tensioning procedures in
the Routine Maintenance section of this manual).
When in operation, the tight side of the belts
should be in a straight line from sheave to sheave
with a slight bow on the slack side.
The ERVe models contain
two forward curved (supply &
exhaust) fans. These forward
curved fans should be checked
for free rotation. If any binding
occurs, check for concealed
damage and foreign objects
in the fan housing. Be sure to
check the belt drives per the
start-up recommendations in
the following section.
Forward Curved
Exhaust Fan
WRONG
WRONG
WRONG
CORRECT
CAUTION
Direction of Fan Wheel Rotation
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.),
consult Greenheck to determine if the unit can
operate safely at the new conditions.
Blower access is labeled on unit. Check for proper
wheel rotation by momentarily energizing the fan.
Rotation is determined by viewing the wheel from the
drive side and should match the rotation decal affixed
to the fan housing (see Rotation Direction figures).
If the wheel is rotating the wrong way, direction can
be reversed by interchanging any two of the three
electrical leads. Check for unusual noise, vibration, or
overheating of bearings. Refer to the Troubleshooting
section of this manual if a problem develops.
Fan Performance Modifications
Due to job specification revisions, it may be
necessary to adjust or change the sheave or pulley to
obtain the desired airflow at the time of installation.
Start-up technician must check blower amperage
to ensure that the amperage listed on the motor
nameplate is not exceeded. Amperage to be tested
with access doors closed and ductwork installed.
Airflow
Fan Belt Drives
The fan belt drive components, when supplied by
Greenheck, have been carefully selected for the
unit’s specific operating condition. Utilizing different
components than those supplied could result in
unsafe operating conditions which may cause
personal injury or failure of the following components:
Forward Curved
Fan RPM
Supply fan and exhaust fan will have an adjustable
motor pulley (on 15 HP and below) preset at the
factory to the customer specified RPM. Fan speed
can be increased or decreased by adjusting the pitch
diameter of the motor pulley. Multigroove variable
pitch pulleys must be adjusted an equal number
of turns open or closed. Any increase in fan speed
represents a substantial increase in load on the
motor. Always check the motor amperage reading
and compare it to the amperage rating shown on the
motor nameplate when changing fan RPM. All access
doors must be installed except the control center
door. Do not operate units with access doors open or
without proper ductwork in place as the fan motors
will overload.
• Fan Shaft
• Fan Wheel
• Bearings
• Belt
• Motor
Tighten all fasteners and set screws securely and
realign drive pulleys after adjustment. Check pulleys
and belts for proper alignment to avoid unnecessary
belt wear, noise, vibration and power loss. Motor and
drive shafts must be parallel and pulleys in line (see
diagrams in this section).
Belt Drive Installation
1. Remove the protective coating from the end of
the fan shaft and assure that it is free of nicks and
burrs.
2. Check fan and motor shafts for
parallel and angular alignment.
3. Slide sheaves on shafts. Do not
drive sheaves on as this may
result in bearing damage.
4. Align fan and motor sheaves
with a straight-edge or
string and tighten.
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Vibration
Drive Belt
Inspect the drive belt. Make sure the belt rides
smoothly through the pulley and over the wheel rim.
Excessive vibration may be experienced during initial
start-up. Left unchecked, excessive vibration can
cause a multitude of problems, including structural
and/or component failure. The most common sources
of vibration are listed.
Air Seals
Check that the air seals located around the outside of
the wheel and across the center (both sides of wheel)
are secure and in good condition. Air seal clearance
is determined by placing a sheet of paper, to act as a
feeler gauge, against the wheel face. To access seals,
follow the instructions in the Energy Recovery Wheel
Maintenance section. To adjust the air seals, loosen
all eight seal retaining screws. These screws are
located on the bearing support that spans the length
of the cassette through the wheel center. Tighten the
screws so the air seals tug slightly on the sheet of
paper.
Many of these conditions can be discovered by
careful observation.
Wheel Unbalance
Refer to the
Troubleshooting
Drive Pulley Misalignment
Incorrect Belt Tension
Bearing Misalignment
Mechanical Looseness
Faulty Belts
Drive Component Unbalance
Poor Inlet/Outlet Conditions
Foundation Stiffness
section of this manual
for corrective actions.
If observation cannot
locate the source of
vibration, a qualified
technician using
vibration analysis
Replace cassette into unit, plug in wheel drive,
replace access door and apply power. Observe by
opening door slightly (remove filters if necessary to
view wheel) the wheel should rotate freely at about
20-40 RPM.
equipment should be consulted. If the problem is
wheel unbalance, in-place balancing can be done.
Generally, fan vibration and noise is transmitted
to other parts of the building by the ductwork. To
eliminate this undesirable effect, the use of heavy
canvas connectors is recommended.
Energy Recovery Wheel
The ERVe models contain a total energy recovery
wheel. The wheels are inspected for proper
mechanical operation at the factory. However, during
shipping and handling, shifting can occur that may
affect wheel operation. The wheel is accessible
through the access
door marked
“Energy Wheel
Cassette Access”.
Turn the energy
recovery wheels
by hand to verify
free operation.
The wheel should
rotate smoothly
and should not
Inside layout of ERVe
wobble.
Bearing
Support
Adjustable
Air Seals
Label
Drive Belt
showing
cassette
serial #
and date
code
Drive Pulley
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Dampers
Routine Maintenance
Check all dampers to ensure they open and close
properly and without binding. Backdraft dampers can
be checked by hand to determine if blades open and
close freely. Apply power to motorized dampers to
ensure the actuator opens and closes the damper as
designed.
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit
to OFF at disconnect switch(es). Unit may have
multiple power supplies.
Fan Belts
CAUTION
Belts must be checked on a regular basis for
wear, tension, alignment, and dirt accumulation.
Premature or frequent belt failures can be caused by
improper belt tension (either too loose or too tight)
or misaligned sheaves. Abnormally high belt tension
or drive misalignment will cause excessive bearing
loads and may result in failure of the fan and/or motor
bearings. Conversely, loose belts will cause squealing
on start-up, excessive belt flutter, slippage, and
overheated sheaves. Both loose and tight belts can
cause fan vibration.
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
Once the unit has been put into operation, a routine
maintenance program should be set up to preserve
reliability and performance. Items to be included in
this program are:
When replacing belts on multiple groove drives, all
belts should be changed to provide uniform drive
loading. Do not pry belts on or off the sheave. Loosen
belt tension until belts can be removed by simply
lifting the belts off the sheaves. After replacing belts,
ensure that slack in each belt is on the same side of
the drive. Belt dressing should never be used.
Lubrication
Apply lubrication where required
Dampers
Check for unobstructed operation
Fan Belts
Check for wear, tension, alignment
Motors
Do not install new belts on worn sheaves. If the
sheaves have grooves worn in them, they must be
replaced before new belts are installed.
Check for cleanliness
Blower Wheel & Fasteners
Check for cleanliness
The proper belt setting is the lowest tension at which
the belts will not slip under peak load operation.
For initial tensioning, set the belt deflection at
1/64-inch for each inch of belt span (measured half-
way between sheave centers). For example, if the
belt span is 64 inches, the belt deflection should
Check all fasteners for tightness
Check for fatigue, corrosion, wear
Bearings
Check for cleanliness
Check set screws for tightness
Lubricate as required
be one inch (using
moderate thumb
Belt Span
Deflection =
64
External Filter
pressure at mid-point
of the drive). Check
belt tension two times
during the first 24 hours
of operation and
Check for cleanliness - clean if required
Internal Filter
Check for cleanliness - replace if required
Door Seal
Belt Span
periodically thereafter.
Check if intact and pliable
Fan Motors
Energy Recovery Wheel
Check for cleanliness - clean if required
Check belt for wear
Check pulley, bearings, and motor
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease buildup
on the motor housing assists proper motor cooling.
Never wash-down motor
Maintenance Procedures:
Lubrication
with high pressure spray.
Greasing of motors is
Check all moving components for proper lubrication.
Apply lubrication where required. Any components
showing excessive wear should be replaced to
maintain the integrity of the unit and ensure proper
operation.
only intended when
fittings are provided.
Many fractional motors
are permanently
lubricated for life and
require no further
lubrication.
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Fan Wheel & Fasteners
Filter Size and Quantities
Pleated Filter Size
Wheels require very little attention when moving clean
air. Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel
and housing should be cleaned to assure smooth and
safe operation. Inspect fan impeller and housing for
fatigue, corrosion or wear.
Quantity
Unit Size
Supply
20 x 20
16 x 20
20 x 25
16 x 20
Exhaust
20 x 20
16 x 25
20 x 25
16 x 20
Supply
Exhaust
ERVe-20
ERVe-35
ERVe-45
ERVe-55
2
3
3
6
2
3
3
6
Routinely check all fasteners, set screws and locking
collars on the fan, bearings, drive, motor base and
accessories for tightness. A proper maintenance
program will help preserve the performance and
reliability designed into the fan.
All dimensions in inches.
Outdoor Air Filters: Access to the outdoor air filters
is through the door labeled as “Filter Access” on the
outdoor air side of the unit.
Bearings
Exhaust Air Filters: Access to the exhaust air filters
is through the door labeled as “Filter Access” on the
exhaust air side of the unit.
Most bearings are permanently lubricated and require
no further lubrication under normal use. Normal use
being considered -20ºF to 120ºF and in a relatively
clean environment. Some bearings are re-lubricatable
and will need to be regreased depending on fan use.
Check your bearings for grease zerk fittings to find
out what type of bearing you have. If your fan is not
being operated under normal use, bearings should be
checked monthly for lubrication.
Refer to Access Door Descriptions section for
additional information on filter locations.
Door Seal Maintenance
Slip-on type seal is installed on the door. Inspect at
least annually to ensure that seal is still pliable and
intact.
External Filter Maintenance
Aluminum mesh, 2-inch deep filters are located in the
supply weatherhood (if the weatherhood option was
purchased). Filters should be checked and cleaned
on a regular basis for best efficiency. The frequency
of cleaning depends upon the cleanliness of the
incoming air. These filters should be cleaned prior to
start-up.
Clean filters by rinsing with a mild detergent in warm
water.
Internal Filter Maintenance
The ERVe units are always provided with 2-inch,
pleated filters in the outdoor air and exhaust
airstreams. These filters should be checked per
a routine maintenance schedule and replaced as
necessary to ensure proper airflow through the
unit. See table for pleated filter size and quantity
for each unit. Replacement filters shall be of same
performance and quality as factory installed filters.
Filter type must be pleated design with integral metal
grid. Two acceptable filter replacements are Aerostar
®
Series 400 or Farr 30/30 .
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Cleaning the Energy Recovery Wheel
Energy Recovery Wheel Maintenance
Annual inspection of the energy recovery wheel is
recommended. Units ventilating smoking lounges
and other non-clean air spaces should have energy
recovery wheel inspections more often based upon
need. Inspections for smoke ventilation applications
are recommended bimonthly to quarterly until a
regular schedule can be established.
If the wheel appears excessively dirty, it should be
cleaned to ensure maximum operating efficiency.
Only excessive buildup of foreign material needs to
be removed. Discoloration and staining of energy
recovery wheel does not affect its performance.
Thoroughly spray wheel matrix with household
®
cleaner such as Fantastik or equivalent. Gently rinse
with warm water and using a soft brush remove any
heavier accumulation. A detergent/water solution can
also be used. Avoid aggressive organic solvents, such
as acetone. The energy recovery wheel segments
can be soaked in the above solution overnight for
stubborn dirt or accumulation.
Accessing the Energy Recovery Wheel
Disconnect power to the ERVe. Open door labeled
“Energy Wheel Cassette Access”.
Unplug the wheel drive motor.
Pull the wheel cassette halfway out.
After cleaning is complete, shake the excess water
from the wheel or segments. Dry wheel or segments
before placing them back into the cassette. Place
wheel or segments back into cassette by reversing
removal procedures.
Removing the Energy Recovery Wheel Segments
(stainless steel rim)
Steel retainers are located on the inside of the wheel
rim. Push the retainer towards the center of the
wheel, then lift up and away to release segments.
CAUTION
Do not clean energy recovery wheel segments with
water in excess of 140ºF (60ºC).
Bracket Segment
Retainer
Do not dry energy recovery wheel segments in air in
excess of 140ºF (60ºC).
Lift away from
segment
Catch Segment
Retainer
Inside of wheel rim
Spoke
The use of a pressure washer to clean segments is
not recommended. Damage could result.
Push toward center
Energy Recovery Wheel Belt
Inspect belts each time
filters are replaced. Belts
that look chewed up
or are leaving belt dust
near the motor pulley
may indicate a problem
with the wheel. Be sure
to inspect wheel for
Important! Place retainers back in the original
position before rotating the energy recovery wheel,
otherwise damage to retainer will occur.
smooth and unrestricted
rotation. If a belt requires
replacement, contact
Wheel Belt & Pulley
the local Greenheck
representative. Instructions
for replacement will ship with the new belt.
Energy Recovery Wheel Bearing
In the unlikely event that
a wheel bearing fails,
the bearing is behind
a removable plate on
the wheel support
beam. Contact the local
Greenheck representative
for detailed instructions
on how to replace the
bearing.
Wheel segment removed
Wheel Bearing
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25
Parts List
Sequence of Operation
Basic Unit
The ERVe units are prewired such that when a call
for outside air is made (via field supplied 24 VAC
control signal wired to unit control center), the supply
fan, exhaust fan and energy wheel are energized
and optional motorized dampers open. The ERVe is
normally slaved (24 volt) to the roof top air handler.
When the roof top air handler starts, the auxiliary
contactor in the air handler closes to start the ERVe.
7
8
7
5
4
Summer Operation
Outdoor air is preconditioned (temperature and
moisture levels are decreased) by the transfer of
energy from the cooler, drier, exhaust air via the
energy recovery wheel. The preconditioned air is
typically mixed with return air going back to the air
handler for final conditioning.
2
3
Economizer Operation: Refer to Economizer
Application/Operation section.
1. Supply blower
• Forward curved fan
Winter Operation
• Adjustable motor mount for belt tensioning
• Adjustable sheaves for speed control
Not depicted on this image
Outdoor air is preconditioned (temperature and
moisture levels are increased) by the transfer of
energy from the warmer, more humid exhaust air via
the energy recovery wheel. The preconditioned air is
typically mixed with return air going back to the air
handler for final conditioning.
2. Vibrations isolators (quantity 4 per blower)
• Neoprene
3. Energy recovery wheel cassette
Frost Control Operation: Refer to Frost Control
Application/Operation section.
4. Removable energy recovery wheel segments
5. Standard supply weatherhood with 2-inch
aluminum mesh filter
Other Accessories:
Rotation Sensor: Refer to Optional Accessories
section
6. Standard exhaust weatherhood with birdscreen
Not depicted on this image
Dirty Filter Sensor: Refer to Optional Accessories
section
7. Standard supply and exhaust air filter racks for
2-inch pleated, 30% efficient filters
CO Sensor: Refer to Optional Accessories section
2
VFD on Blowers: VFDs on blowers are often used
as part of a demand control ventilation system. This
type of system takes advantage of varying occupancy
through the use of CO sensors to monitor space CO
8. Electrical control box (standard features)
• Single point power
• Disconnect interlocked with access door
• Motor starters for the supply blower, exhaust
blower and energy wheel motors
2
2
levels. If CO levels are low in the space, the VFD will
2
operate the blowers at minimum airflow required by
• 24 VAC, control circuit with terminal strip
code. As the space occupancy increases and CO
levels increase, the VFD will increase the amount
of fresh outdoor air being brought in to offset the
2
9. Exhaust blower
• Forward curved fan
• Adjustable motor mount for belt tensioning
• Adjustable sheaves for speed control
Not depicted on this image
CO levels in the space (exhaust airflow is increased
2
proportionally as outdoor airflow increases). As CO
levels come back down, the airflow will decrease
back to minimum requirements.
2
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Troubleshooting – Airflow
Test and Balance Report
The Test and Balance Report (TAB) is utilized to determine whether the appropriate amount of outdoor air
and exhaust air is being supplied and removed from a building, respectively. There are no set rules on what
information must be included in a TAB report. As such, if a TAB report indicates that the airflow on a unit is low,
prior to contacting the factory, please determine the following information:
Unit #1
Unit #2
Unit #3
Unit #4
Model Number
Serial Number
Nameplate Information
Voltage
Hertz
Phase
Outdoor Air Fan Amps
Exhaust Fan Amps
Outdoor Air Fan Horsepower
Exhaust Fan Horsepower
Design Airflow
Outdoor Air
Exhaust
Measured Airflow
Outdoor Air
Exhaust
Measured Data
Blower Rotation
Outdoor Air Fan RPM
Exhaust Fan RPM
Outdoor Air Fan Amp Draw
Exhaust Fan Amp Draw
Pressure Drop Across Energy Recovery Wheel
Outdoor Air Side
Exhaust Side
Airflow problems can often be tied back to improper ductwork installation. Be sure to install ductwork in
accordance with SMACNA and AMCA guidelines.
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Troubleshooting – Unit
Symptom
Possible Cause
Corrective Action
Replace fuse or reset circuit breaker and check
amps.
Blown fuse or open circuit breaker.
Defective motor or capacitor.
Motor starter overloaded.
Replace.
Blower fails to
Reset starter and check amps.
operate
Check for On/Off switches. Check for correct
supply voltage.
Electrical.
Drive.
Check for broken or loose belts. Tighten loose
pulleys.
Shorten wiring run to mechanical room or
install a relay which will turn unit on/off. Consult
Factory for relay information.
Control power (24 VAC) wiring run is too long
(resistance should not exceed 0.75 ohms).
Motor starters
“chatter” or
do not pull in
Incoming supply power is less than anticipated.
Voltage supplied to starter coil must be within
Need to increase supply power or use a special
control transformer which is sized for the actual
+10% / -15% of nominal voltage stated on the coil. supply power.
CFM too high.
Check cfm and adjust drives if needed.
Static pressures are higher or lower than
design.
If higher, ductwork should be improved.
If lower, fan rpm should be lower.
Blower rotation is incorrect.
Motor voltage incorrect.
Check rotation and reverse if necessary.
Motor over amps
Check motor nameplate versus supplied
voltage.
See specifications and catalog for fan curves to
determine if horsepower is sufficient.
Motor horsepower too low.
Shorted windings in motor.
Unit damper not fully open.
Replace motor.
Adjust damper linkage or replace damper motor.
Improve ductwork to eliminate losses using
good duct practices.
System static pressure too high.
Blower speed too low.
Check for correct drives and rpm with catalog
data.
For 3-phase, see Direction of Fan Wheel
Rotation under Unit Start-Up section.
Fan wheels are operating backwards.
Low airflow (cfm)
Follow cleaning procedures in Routine
Maintenance section.
Dirty filter or energy wheel.
Leaks in ductwork.
Repair.
Elbows or other obstructions may be
obstructing fan outlet.
Correct or improve ductwork.
Adjust belt tension.
Belt slippage.
Check for correct fan rpm. Decrease fan speed
if necessary.
Blower fan speed too high.
Filter(s) not in place.
Install filters.
High airflow (cfm)
Induce Ps into system ductwork. Make sure
grilles and access doors are installed. Decrease
fan speed if necessary.
Insufficient static pressure (Ps) (airflow
resistance).
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or
service information.
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Troubleshooting – Unit
Symptom
Possible Cause
Corrective Action
One or both
blowers turn off
intermittently and
back on after
Adjust frost temperature sensor set point as
needed.
Exhaust Only frost control sensors are tripping.
about 2 minutes
See Energy Recovery Wheel under Unit Start-Up
section.
Air seals are too tight.
Adjust temperature or enthalpy set points as
needed.
“Economizer” sensors are operating.
No power to wheel motor.
Wheel drive belt.
Energy wheel does
NOT turn
Make sure wheel drive is plugged in. Verify
power is available.
Check for loose or broken belts. Replace belts
(consult factory).
Refer to VFD section. Compare motor amp
rating to setting in VFD. Adjust accordingly.
VFD overload. (OL1 on readout)
Recheck air seals, make sure they are not too
tight. See Energy Recovery Wheel under Unit
Start-Up Section.
Energy wheel runs
intermittently
Wheel motor overloads are tripping, due to
rubbing between wheel and air seals.
Adjust wheel and/or inlet cone. Tighten wheel
hub or bearing collars on shaft.
Fan wheel rubbing on inlet.
Bearings.
Replace defective bearing(s). Lubricate
bearings. Tighten collars and fasteners.
Wheel out of balance.
Loose wheel on shaft.
Loose motor or blower sheave.
Belts too loose.
Replace or rebalance.
Tighten wheel setscrew.
Tighten sheave setscrew.
Adjust belt tension after 24 hours of operation.
Excessive noise
or vibration
Loosen to maintain a 3/8 inch deflection per
foot of span between sheaves.
Belts too tight.
Worn belt.
Replace.
Motor base or blower loose.
Buildup of material on wheel.
Bearing and drive misaligned.
Tighten mounting bolts.
Clean wheel and housing.
Realign.
Make sure ductwork is supported properly.
Make sure ductwork metal thickness is sized for
proper stiffness. Check duct size at discharge to
ensure that air velocities are not too high.
Noise being transmitted by duct.
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or
service information.
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Maintenance Log
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
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_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
_________________________________________________
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Maintenance Log
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
_________________________________________________
_________________________________________________
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Model ERVe Energy Recovery Unit
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31
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from
the shipment date. The energy recovery wheel is warranted to be free from defects in material and workmanship for a
period of five years from the shipment date. Any units or parts which prove defective during the warranty period will
be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by the motor
manufacturer for a period of one year. Should motors furnished by Greenheck prove defective during this period, they
should be returned to the nearest authorized motor service station. Greenheck will not be responsible for any removal
or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Greenheck Catalog Energy Recovery Ventilator, Model ERVe,
provides additional information describing the equipment,
fan performance, available accessories, and specification
data.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: [email protected] • Web site: www.greenheck.com
473007 • Model ERVe IOM, Rev. 2, April 2012
Copyright 2012 © Greenheck Fan Corp.
32
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