Venmar ERV500i Manual

Installation, Operation and
Maintenance Instructions
ERV500i/e
ERV500i

-2-
Ta le Of Contents
Safety Considerations ...................................................................3
General Information ......................................................................3
Installation
CheckEquipment.........................................................................3
MountUnit ..............................................................................3
MakeDuctConnections....................................................................4
Rigging And Placing The Unit (ERV500e ONLY) .....................................................4
nstall Hoods (ERV500e ONLY) ..................................................................4
nstallAccessPanelHandles................................................................4
RemoveAll nternalPackaging ..............................................................4
Systems ntegration .......................................................................5
ElectricalConnections .....................................................................5
Start Up
Controls .................................................................................6
FrostControl ............................................................................6
SequenceOfOperation ....................................................................6
AirflowBalancing .........................................................................7
System Service
QuarterlyMaintenance.....................................................................7
AnnualMaintenance ......................................................................7
TestingAndReplacementOfTheDamperActuator ..............................................7
MotorAndBlowerRemoval .................................................................8
CassetteRemoval ........................................................................8
CassetteService .........................................................................9
Appendix A: Roofcurb Detail (ERV500e ONLY) .....................................................11
Appendix B: DimensionalDrawing ...........................................................12
Appendix C: Hood nstallation And Rigging (ERV500e ONLY) ..........................................14
Appendix D: Minimum Distance Requirements And Typical nstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Appendix E: Components ..................................................................16
Appendix F: EquipmentData................................................................18
Appendix G: AirflowPerformanceCharts ......................................................18
Appendix H: TerminalControlDiagrams .......................................................19
Appendix I: TroubleShooting ...............................................................23
anufacturer reserves the right to discontinue or change specifications or designs without notice or obligation.

-3-
Safety Considerations
Hazards may exist within this equipment because it
contains electrical and powerful moving components.
Only qualified service personnel should install or service
this equipment. Untrained personnel can perform basic
maintenance such as maintaining filters. Observe pre-
cautions marked in literature and on labels attached to
the unit. Follow all safety codes.
General Information
Energy Recovery Ventilators (ERVs):
ERV500i and ERV500e
The ERV500i ventilator is intended for installation with-
in a suspended ceiling space or mechanical room. The
ERV500e ventilator is intended for installation on a
rooftop with a factory supplied or field supplied roofcurb.
These ventilators provide 100% outdoor air ventilation
and provide energy recovery between the exhaust and
supply airstreams. The Energy Recovery Ventilators
(ERVs) use an enthalpy wheel for total energy recovery
which provides superior efficiency in hot and humid cli-
mates. n addition, they provide excellent heat recovery in
winter and transfer moisture from exhausted air to the
outdoor air before supplying it to an occupied space.
Installation
Check Equipment
Move the unit to its installation location and remove pack-
aging. See Appendix F for unit weight and specifications.
nspect the exterior and interior of the equipment for
damage. Ensure there is no damage to internal compo-
nents such as fans, motors, dampers, enthalpy wheel,
insulation, etc. File a claim with the shipping company if
the unit is damaged.
System Requirements
Consult local building codes and the National Electrical
Code for special installation requirements. Note additional
requirements below and in the Start Up Section.
Mount Unit
Interior ount
The unit should be installed to allow easy access for
maintenance. Appendix B shows minimum clearance
required between front access and any obstruction to
allow for removal of components (fans, filters, enthalpy
wheel). The front of the unit is defined in relation to the
inlet ports and outlet ports on the unit. Port location and
overall dimensions are shown in Appendix B. Unit com-
ponents are shown in Appendix E.
n cold climates (-5°F [-20°C] design), the unit must be
mounted in a dry area (not exceeding 30% RH) to avoid
condensation on the exterior of the cabinet during winter
operation. Alternatively, accommodation must be made
for condensation on the cabinet exterior. Do not mount
units in an area where exposure to hot chimneys, electri-
cal panels or other hazards will occur.
A mounting location close to an exterior partition will
minimize the length of insulated ductwork required.
Exhaust air to outside and inside air ducts must be insu-
lated. nlet and exhaust hoods should be separated by
a minimum of 10 feet [3048mm] to avoid outside cross
contamination.
Ceiling ount
The unit must be mounted level and may be hung with
threaded rod (field supplied) through the protruding frame
at the base of the unit. Hole centers are shown in the
overall dimensional drawings in Appendix B. Rubber or
seismic vibration isolation may be required in some
regions (field supplied and specified).
Surface ount
The unit may be secured to a metal or wooden curb fas-
tened to the floor. f securing the unit to the curb is
required, fasteners and isolators may be used at the
mounting points on the frame protruding from the unit (all
mounting hardware is field supplied and specified).
Rooftop ount (ERV500e ONLY)
Care must be exercised in locating the roofcurb for the
unit on the roof opening. The HVAC system should cross
enough roof supports to safely distribute the weight of the
system over the roof. For hole sizes of the units, see
Appendix B. For more roofcurb information, see Appendix A.
Remove roofcurb from packaging. Assemble and install
accessory roofcurb in accordance with instructions shipped
with the curb. See Appendix A for curb dimensions. nstall
cant strip, flashing and roof felt as per Appendix A.
Ductwork must be attached to the roofcurb, not the unit.
Consult with local authorities or your local building code
for minimal intake hood height from the roof to determine
the height of the roofcurb. See Appendix B for dimensions
of the unit.
WARNING
Disconnect the main power switches to the unit before
performing service or maintenance. Electric shock can
cause personal injury.
IMPORTANT
The gasketing of the unit to the roofcurb is critical for a
watertight seal. nstall gasket with the roofcurb as
shown in Appendix A. mproperly applied gasket can
result in water leaks and poor unit performance.

-4-
Make Duct Connections
ERV500i
Port locations for the indoor unit are labeled in
Appendix B-1.
An 18" [457mm] long section of straight duct must be
used immediately after the supply fan to achieve optimal
fan performance. Transitions (field supplied) may be
required to make connection with ductwork that is
properly sized for minimum noise and pressure loss. Both
duct connections to outside must be insulated to avoid
condensation and heat loss. A continuous integral vapor
barrier must be used over the duct insulation.
Airflow rate balancing dampers are recommended for
both supply and exhaust ducts to allow for adjustment of
airflows as shown in Appendix D-1. Flexible connectors
should be installed close to the unit in the duct leading to
occupied spaces to minimize noise transmission. All ports
have 1" [25mm] flanges to facilitate duct connection.
Ensure that fasteners used to make duct connection
do not interfere with fans or dampers in the unit.
Electric preheat, if used as frost control, must be
installed in the intake from outside at a minimum distance
from the unit port of 24" [610mm].
ERV500e
On vertical discharge units, secure all ducts to the
roofcurb and building structure. Do not secure ductwork
to the unit. For duct size requirements, see Appendix B.
nsulate and weatherproof all external ductwork, joints
and roof openings with counter flashing and mastic in
accordance with applicable codes. Ductwork running
through roof decks must comply with local fire codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier. Flexible
connectors should be installed close to the unit in
the duct leading to occupied spaces to minimize noise
transmission.
Rigging And Placing The Unit (ERV500e ONLY)
nspect the exterior and interior of the equipment for
damage. Ensure there is no damage to internal compo-
nents such as fans, motors, dampers, enthalpy wheel,
insulation and structures. File a claim with the shipping
company if the unit is damaged.
Spreader bars are required to prevent damage to the
roof flange. Rollers may be used to move the unit across
a roof. Lifting holes are provided in the base rails as shown
in Appendix C. For weights and overall dimensions, see
Appendix B-2.
Location
Maintain clearance around and above the unit to pro-
vide proper airflow and service access. The fresh air
intake hood must be positioned away from sources of
contamination such as chimneys, exhaust vents, etc.
Positioning the fresh air intake opposite to the prevailing
winds will reduce entry of snow or moisture during periods
of high winds.
Install Hoods (ERV500e ONLY)
ntake and exhaust hoods for these models are shipped
separately from the unit. See Appendix C for hood installa-
tion information. A quick connect for the damper motors is
provided to connect to the main body of the unit. Make
sure that all screws are secured to maintain proper support
and keep seals watertight.
Install Access Panel Handles
Handles for access panels are provided but must be
installed on site. Handles and fasteners are secured on
the top of the unit. Remove from packaging and install
according to drawing below.
Remove All Internal Packaging
Remove access panels and remove all packaging from
the unit. Note that there is packaging for the wheel sup-
port during shipping. Removal of all of this packaging is
critical.
Metal/or
Polyamide
Handle
#10 x 3/4 Screw
Access Panel
CAUTION
All panels must be in place when rigging.
CAUTION
Remove all ERV wheel packaging prior to start up.
IMPORTANT
The hoods for these units are not installed from the fac-
tory and must be installed on-site. They can be installed
prior to rigging the unit or after the unit is installed.
Hoods are shipped on top of the unit. When rigging the
unit, ensure that the hoods are secured and are not
damaged by the spreader bars. See Appendix C for
hood installation and rigging information.
IMPORTANT
Securing door fasteners too tightly has negative effects
on the door gasket and should be avoided.

-5-
Systems Integration
Forced Air System
When the unit is installed in conjunction with a forced-
air system, the air handler and the network of ducts
associated with it are used to distribute fresh air inside the
building. f this type of system is used, the main fan of the
air handler must operate continuously when the unit is on.
Fan Interlock can be connected in the unit control box to
the integrated control board terminals J3-1 and J3-2. The
controller makes relay contact between these terminals
when the unit is operating, as shown below.
Fresh air from the unit should be introduced into the
return duct of the air handler at a point no less than 6 feet
[1829mm] upstream of the air handler. The duct connec-
tion for stale air to the unit should be made on the return
air duct at least 2 feet [610mm] upstream of the fresh air
duct connection.
Separate Systems
Select locations for exhaust grilles and supply diffusers
to provide effective ventilation and avoid short circuiting
airflows through the space. Adjustable dampers should
be provided at every grille and diffuser to make balancing
of the system possible.
Exterior Hoods
The outside air intake hood must be positioned away
from sources of contamination. A screen with 1/4" [6mm]
grid is recommended to prevent intake of debris and
pests. The screen should be removable in cold climates
where frost blockage may occur.
Electrical Connections
Power Supply
These units may, or may not, have a factory installed
disconnect switch. f disconnect is field supplied, provide
a disconnect as per NEC. Use copper conductors only.
All field wiring must comply with NEC and local require-
ments. n Canada, electrical connections must be in
accordance with CSA C22.1 Canadian Electrical Code
Part One.
Field Connection
A high voltage connection (shown below) is located on
the outside of the unit with knockout. A field installed dis-
connect switch must use a liquid tight connector between
the disconnect switch and the outside panel of the unit
eliminating any water penetration into the control box. A
wiring diagram is located on the control box lid inside of
the unit.
The low voltage connection runs through the roofcurb
and roof opening to the bottom panel. Low voltage remote
wiring terminal is located inside the unit on the control
box. nstaller must provide wiring for the controls that may
be supplied optionally.
13 2
J1
6
9
4
7
G
1J2
COMM.
N/C
N/O
J3
21
FF
J4 JU1
3
IOC OL R
JU1G-INTERMITTENT STANDBY (IS)
JU1F-EXTENDED DEFROST
48644 POWER CONTROL BOARD
FAN INTERLOCK
CONTACTS
YB
A B C D E F G
ERV500i ERV500e
Line Voltage 120 230
CA 9.4 11.1
OP 10 15
3/4" LockNut
3/4" LockNut
(As seen from
inside the unit)
Rooftop Unit
(Cut-Away shown)
Line Disconnect Switch
(Cut-Away shown)
3/4" x 1-3/8" Liquid Tight Connector
WARNING
Unit cabinet must have an uninterrupted, unbroken elec-
trical ground to minimize the possibility of personal
injury if an electrical fault should occur. Failure to follow
this warning could result in the installer being liable for
personal injury of others.

Start Up
Controls
A low voltage remote control wiring interface is provided
on the unit. The installer must provide wiring for the con-
trols that may be supplied optionally. The optional wall
controls require a 4-wire LVT 24 gauge (or equivalent).
This control is 12 VDC. Other terminals are 24 VAC or dry
contact control. Terminals are available for the following
controls:
LOW-COM-HIGH
Makes dry contact for speed setting
Wall Control
4-wire LVT 24 gauge minimum (12 VDC)
Occu ied Timer/Sensor
Needs dry contact to operate. 24 VAC is required
when timer is used. Do not use with Xtra wall control.
Enthal y Control
24 VAC
Remote Fan Control
Requires single pole, double throw switch
Low Tem erature Control
Makes dry contact
Wheel Rotation Sensor
Makes dry contact
CO2Ventilation Control
Makes dry contact
Unoccu ied Recirc Contacts (ERV500i ONLY)
24 VAC
Smoke Detector
Makes dry contact
For more information on the controls available for the
energy recovery ventilators, see the following Appendix H
references:
H-1 Wall Control Connection
H-2 Occupied Timer/Sensor Connection
H-3 Enthalpy Control
H-4 Remote Fan Control
H-5 Low Temperature Control
H-6 Wheel Rotation Sensor
H-7 CO2Ventilation Control
H-8 Unoccupied Recirc Contacts (ERV500i ONLY)
H-9 Smoke Detector
Frost Control
The unit functions are controlled by integrated unit
controls including recirculation/exhaust only defrost
(optional). n cold temperatures, frost control cycles will
remove frost from the enthalpy wheel to maintain proper
operation. This removal of frost occurs when a damper
closes the outside air port and allows room air to circulate
through the enthalpy wheel and back to the vented room.
Each unit has different frost control requirements and the
schedules are shown on the wiring diagrams located in the
unit control box.
Exhaust Only
Supply fan is de-energized. There is no outdoor air ven-
tilation for the duration of frost control. Enthalpy wheel
maintains rotation.
Recirculation (ERV500i ONLY)
The exhaust fan is de-energized. There is no outdoor
air ventilation for the duration of frost control. Enthalpy
wheel continues to rotate.
Sequence Of Operation
Before start-up, check the unit for obstructive packag-
ing, objects near or in blowers, dampers, enthalpy wheel,
etc. Once installation is complete, check all modes of
operation to ensure that the unit is working properly.
Close the doors and check for operation on LOW and
H GH using the dry contacts labeled LOW-COM-H GH on
the side of the unit. f there is a wall control, check the
operation of all speed settings.
Units equipped with frost control: When the unit is in
'defrost', 'unoccupied mode' or 'off', the ventilation
damper will close. The ventilation damper will open dur-
ing ventilation.
Unit check points:
___ Power connected, no ventilation call - Both fans
are off, frost control damper (if equipped) closes off
fresh air from outside.
___ Power connected, low speed call (if equipped) -
Both fans on low speed, frost control damper (if
equipped) opens fresh air from outside and
closes recirculation opening. f unit is single speed,
it will come on that speed on a call for low or high.
___ Power connected, high speed call - Both fans on
high speed, frost control damper (if equipped)
opens fresh air from outside and closes recircula-
tion opening. f unit is single speed, it will come on
the speed on a call for low or high.
___ Power connected, occupied timer/sensor connec-
tion open (unoccupied mode) - Both fans are off,
frost control damper (if equipped) closed off fresh
air from outside.
___ Power connected, enthalpy control contacts
closed, unit ventilating - wheel stops rotating, fans
stay on set speed, frost control damper (if
equipped) is open.
___ Power connected, enthalpy control contacts
closed, unit not in ventilation mode - wheel does
not rotate, fans come on low speed (if equipped), if
unit is single speed, it will come on that speed on a
call for low or high, frost control damper (if
equipped) is open.
___ Power connected, recirculation defrost (optional) is
factory installed. Recirc contacts are closed,
exhaust fan is de-energized, supply fan runs and
recirculation damper opens. (ERV500i ONLY)
-6-
IMPORTANT
On initial power up, the unit will perform a system check
and operate at high speed for 5 seconds.

-7-
Airflow Balancing
For proper performance the unit must operate with
equal supply and exhaust flow rates. Flow Measuring
Stations (FMS) and magnehelic gauges can be used to
measure and compare supply flow with exhaust flow.
Appendix D shows proper installation of the FMS in the
"exhaust air from space" and "supply air to space" ducts
for measuring exhaust and supply flows respectively.
t is important to locate the FMS in the "warm side"
ductwork as described above to minimize the effect of dif-
ferences in air density, especially when balancing during
extreme cold outside conditions. Air density variations
can effect the FMS by more than 15%.
The FMS should be located downstream from straight
sections of duct and not immediately after fans or
obstructions that will cause turbulent flow. See Appendix
D which illustrates minimum distances from fan, elbows
or transitions for best operation.
Flow control dampers should be installed downstream
from the FMS so flow through the FMS is not disturbed.
Dampers can then be adjusted to equalize flow rates in
the ducts.
Setting Flow Rate
Flow rates should be balanced with units operating on
high speed. A damper must be used to establish the min-
imum duct pressure required so fans do not operate in
overload regions. See Appendix G for airflow perfor-
mance charts. Set the dampers to establish the minimum
duct pressure required. Further adjust the dampers to
reduce flow to the desired, balanced rate.
System Service
Quarterly Maintenance
Quarterly maintenance (every three months) should
include:
Air Filters
The standard medium efficiency filters are disposable
and should be replaced every three months. More fre-
quent replacement may be required under extremely
dirty operating conditions. For filter specifications, see
Appendix F.
Cassette Panels and Interior of Unit
The foil-faced insulation surfaces and cassette panels
should be wiped clean with a soft cloth and mild cleaning
solution.
Annual Maintenance
Annual maintenance should include:
Air Filters
Replace medium efficiency filters.
Interior of Unit
Wash the foil-faced insulation surfaces with a soft cloth
and mild cleaning solution.
Enthalpy Wheel
No cleaning of the enthalpy wheel is required, it is self-
cleaning due to the opposing airflows. f the enthalpy
wheel needs to be cleaned; use low pressure air or a
vacuum. Wash the cassette panels with a soft cloth and
mild cleaning solution. Visually inspect the cassette brush
seals (shown below), perimeter seal and drive belt for
proper operation.
Fans
The blower wheels and fan housing should be checked
for dirt build-up. f they are dirty, it will be necessary to
remove the blower assembly to clean the dust out
through the fan mouth.
System Operation Check
Verification of all control modes should be checked to
ensure proper operation. Refer to Start Up Section.
Testing And Replacement Of The Damper
Actuator
After disconnecting the power from the unit, determine
if the actuator is defective. Disconnect the 24v power
source. Connect the actuator directly to a 24v power
source with an appropriate cable. f the damper operates
correctly, the problem is either in the wiring connections
or main circuit board.
f the actuator does not work, it must be replaced.
Loosen the nuts on the jack shaft clamp, remove the actu-
ator. Tighten the clamp on the damper jack shaft. Test for
proper operation.
Rotor Brush Seal
ERV500i/e ROTOR
18" Dia. 8" Depth Press. drop
cfm fpm in W. G.
300 417 0.45
400 556 0.60
500 695 0.76
600 834 0.93
700 973 1.10
WARNING
Disconnect the main power switch to the unit before
performing service and maintenance procedures.
WARNING
Disconnect the main power switch to the unit before
performing service and maintenance procedures.

Motor And Blower Removal
Exhaust
After disconnecting the power from the unit, disconnect
all the plug-in connectors on the left side of the control box.
Remove the four Phillips head screws holding the con-
trol box cover. Using a 1/4" nut driver, remove the four hex
head screws holding the control box to the unit. Remove
the control box to gain access to the exhaust blower
assembly.
To remove the exhaust blower, unscrew the two wing
nuts used to fasten the blower assembly to the middle
shelf in the unit. Rotate the blower assembly and slide it
out of the unit.
Supply
After disconnecting the power from the unit, disconnect
the 3-wire connector between the supply motor and
control box.
To remove the supply blower, unscrew the four wing
nuts used to fasten the blower assembly to the middle
shelf of the unit. Slide the blower assembly out of the unit.
Cassette Removal
After disconnecting the power from the unit, disconnect
the two 3-wire connectors located on the metal frame of
the cassette assembly. Both connectors are positioned at
the front of the cassette assembly, one connector located
at the top right position and the other at the bottom left
position on the cassette frame. Disconnect the 3-wire
connector from the control box being used to supply
power to the cassette motor.
WARNING
Disconnect the main power switch to the unit before
performing service and maintenance procedures.
WARNING
Disconnect the main power switch to the unit before
performing service and maintenance procedures.
ATTENTION
Use extreme care when removing or installing the cas-
sette assembly. Damage to the cassette media may
result in poor unit efficiency and may void the warranty.
-8-

-9-
Remove the cassette assembly by sliding it forward out
of the cassette guides. Ensure that no wires are damaged
during this process.
Cassette Service
Brush Seal
Complete the following instructions to replace the brush
seal on both sides of the cassette. On the belt side of the
cassette, remove the two Phillips screws holding the air
filter guide to the cassette assembly. Remove the addi-
tional Phillips screw holding the brush seal to the cassette
assembly. On the motor side of the cassette, remove the
three Phillips screws holding the brush seal to the cas-
sette assembly.
nstall the new brush seals so that the bristles come in
contact with the cassette. Reverse the procedures above
to re-install the brush seals and the air filter guide.
Drive Belt
To replace the cassette drive belt, the brush seal
located on the drive belt side of the cassette must be
removed. Complete the steps in the previous section for
the removal of the brush seal prior to completing the
following procedures.
The cassette beam assembly must be removed to gain
access to the cassette drive belt. To remove the cassette
beam assembly, remove the three Phillips screws used to
fasten the cassette beam cover.
Using a 1/8" Allen key, loosen the two set screws used
to tighten the cassette bearing to the cassette shaft. The
set screws are located in-line with the cassette shaft,
between the cassette and the cassette beam. After loos-
ening one set screw, it will be necessary to rotate the
wheel a half turn to access the second set screw.
Using a 7/16" nut driver, remove the four 1/4" bolts
holding the cassette beam to the cassette frame. The
cassette beam can now be removed and placed aside to
re-install later.

- 10 -
Remove the outer half of the adjustable sheave (pulley).
Using a 5/32" Allen key, loosen the set screw located on the
outer half of the adjustable sheave. Remove the outer half
of the adjustable sheave by turning it counter-clockwise.
This sheave piece is threaded and therefore it will take a
few rotations to completely remove it. Once removed, slide
the belt off the cassette.
nstall the new belt onto the cassette and adjustable
sheave (pulley). Re-install the outer half of the adjustable
sheave by rotating it clockwise onto the threaded shaft.
This process will be used to tighten the belt around the
perimeter of the cassette. DO NOT tighten the belt onto
the cassette until the beam assembly has been re-
installed.
Reverse the above procedures to re-assemble the cas-
sette assembly. t will also be necessary to complete the
steps in the previous sections that were used to install the
cassette brush seal and the cassette.

- 11 -
Appendix A
Roofcur Detail (ERV500e ONLY)
ERV500e
A
A
NOTE: Dimensions in [ ] are millimeters
15.000"
[381]
1.500" typ.
[38]
1.500" typ.
[38]
17.500"
[445]
14.500"
[368]
2.375"
[60]
5.500"
[140]
15.250"
[387]
64.000"
[1,626]
61.000"
[1,549]
WOOD NAILER
RETURN AIR SUPPLY
AIR
RIGID INSULATION
(styro)
SECTION A-A
Unit
Counter Flashing
(Field Supplied)
Roofing Felt
(Field Supplied)
Unit
Baserail
Overhang:
3" [76mm]
Roofing Material
(Field Supplied)
Cant Strip
(Field Supplied)
3/8" [10] Gasket
(Supplied with Curb)
Rigid Insulation
(Optional)
Wood Nailer

- 12 -
B-1: ERV500i
1. Dimensions in [ ] are millimeters
2. Center of gravity 3. Direction of airflow
22.000"
[559]
5.750"
[146]
4.000"
[102]
5.000" [127]
5.250" [133]
22.000"
[559]
2.000"
[51]
8.000"
[203]
OUTDOOR AIR
OPENING
EXHAUST AIR
OPENING
NOTE: Requires a minimum of
24.000" [610] clearance
to open door and remove internal components.
14.000"
[356]
PTS
A
B
C D
TOTAL
LBS
53.0
30.5
43.0
63.5
190.0
Kg
24.0
13.7
19.5
28.8
86.0
ERV500i
23.000"
[584]
9.375"
[238]
56.000"
[1,422]
A B
CD
27.750"
[705]
16.000"
[406]
54.000"
[1,372]
52.000"
[1,321]
58.000"
[1,473]
24.000"
[610]
EXHAUST
AIR
RETURN
AIR
SUPPLY
AIR
OUTDOOR
AIR
SUPPLY FAN, CONTROL BOX, FILTER, CASSETTE
ACCESS PANEL
14.000"
[356]
8.000"
[203]
2.000"
[51]
RECIRCULATION DEFROST PORT
(OPTIONAL)
23.000"
[584]
14.000"
[356] 1.500"
[38]
8.000"
[203]
5.750"
[146]
2.750"
[70]
4.500"
[114]
5.250" [133]
4.000"
[102]
RETURN
AIR OPENING
SUPPLY AIR
OPENING
ELECTRICAL
CONNECTION
BOX
LOW VOLTAGE
CONNECTION
(Leave 16" [406] in front for access)
LEFT VIEW FRONT VIEW
BOTTOM VIEW
RIGHT VIEW
TOP VIEW
NOTES:
HANGING MOUNT HOLE Ø 0.625" [16]
NOTE: If the unit is to be hung, materials
required to hang the unit will be
supplied by others.
Appendix B
Dimensional Drawing

- 13 -
B-2: ERV500e
Low voltage knockout
A
B
7/8"
Low voltage knockout 1 1/8"
Connection Sizes
3.810"
[97]
68.000"
[1,727]
52.000"
[1,321]
15.000"
[381]
2.705"
[69]
5.700"
[145]
5.150"
[131]
5.310"
[135]
6.047"
[154]
4.983"
[127]
14.000"
[356]
10.257"
[261]
6.776"
[172]
16.000"
[406]
10.250"
[260]
15.260"
[388]
27.000"
[686]
14.393"
[366]
16.000"
[406]
6.500"
[165]
24.090"
[612]
1.000"
[25]
22.000"
[559]
11.091"
[282]
9.500"
[241]
13.500"
[343]
9.200"
[234]
15.500"
[394]
27.000"
[686]
19.981"
[508]
FIELD
POWER
SUPPLY
6.100" [155]
23.000"
[584]
7.831"
[199]
17.843"
[453]
24.000"
[610]
7.100"
[180] 4.481"
[114]
12.380"
[314]
24.000"
[610]
EXHAUST
AIR
OUTDOOR
AIR
OUTDOOR
AIR HOOD
AIR
RETURN
BOTTOM
AIR SUPPLY
BOTTOM
EXHAUST
AIR HOOD
RETURN
AIR
END SUPPLY
AIR
NOTE: Requires a minimum of 24.000" [610]
clearance to remove internal components.
SIDE
RETURN
AIR
OUTDOOR
AIR
SUPPLY
AIR
EXHAUST
AIR
23.000"
[584]
30.831"
[783]
B
A
TOP VIEW
FRONT VIEWLEFT VIEW RIGHT VIEW BACK VIEW
NOTES:
1. Dimensions in [ ] are millimeters
2. Direction of airflow
CONNECTION TABLE
ERV500e
SECTION VIEW AA
A A
Appendix B Continued
Dimensional Drawing

- 14 -
Hood Installation
Appendix C
Hood Installation And Rigging (ERV500e ONLY)
Rigging
Screw: #10 x 3/4
Detail "A"
Detail "B"
Female
Male Black
Male
Female
White
White
Black
See Detail "B"
See Detail "A"
SPREADER BARS
NOTE:
Remove all packaging before beginning to
rig the unit onto the installed roofcurb.

- 15 -
D-1: ERV500i - inimum Distance Requirements
D-2: ERV500e - Typical Installation
Exhaust Air
From Space
Flow Measuring
Station (FMS) Balancing
Damper
Flexible Duct
Connection
Exhaust Air
To Outside
Supply Air
From Outside
Supply Air
To Space
Min. 36"
[914mm]
Min. 36"
[914mm]
Min. 36"
[914mm]
Min. 12"
[305mm]
Exhaust
Air
Return
Air
Roofcurb
Supply
Air
Supply
Air
Appendix D
Minimum Distance Requirements And Typical Installation

- 16 -
ERV500i
12
4
57 10 11 63
Item Description
1 Supply blower
2 Supply blower motor
3 Exhaust blower
4 Exhaust blower motor
5 Control box
6 Supply filter
7 Exhaust filter
8 Damper actuator
9 ntake damper
10 Enthalpy wheel
11 Wiper seal
8
9
NOTE: Some unit components listed above
are optional. Consult the unit nomenclature for
standard and optional components.
Appendix E
Components

- 17 -
19
18
16
17 13
12 11 10 14 4789123
15
6
5
19
3
2
1
Item Description
1. Housing
2. Fan
3. Fan motor
4. Enthalpy wheel
5. Wheel drive motor
6. Wheel drive pulley
7. Wheel drive belt
8. Wheel perimeter seal
9. Wheel wiper seal
10. Damper actuator
11. Damper intake
12. Exhaust damper actuator
13. Exhaust damper
14. MEF supply filter set - 2/set
15. MEF exhaust filter set - 2/set
16. Oudoor air intake hood
17. Exhaust air hood
18. Aluminum mesh pre-filter
19. Control box
NOTE: Some unit components listed above
are optional. Consult the unit nomenclature
for standard and optional components.
ERV500e
Appendix E Continued
Components

- 18 -
ERV500i ERV500e
Rated airflow (cfm) 620 cfm @ 0.50" w.g. 500 cfm @ 0.50" w.g.
Shipping weight 320 lbs [145 kg] 320 lbs [145 kg]
Shipping dimensions 57.5" x 24.75" x 24" 68" x 27" x 23"
l x w x h [1461 x 629 x 610mm] [1727 x 686 x 584mm]
Fans 8.5" dia x 3.5" wide Supply Exhaust
impeller (fwd centrifugal) [216mm dia x 89mm wide] 500 @ 0.5" 500 @ 0.5"
high speed 1700 rpm
motor 1/4 HP, 2 speed
Supply and Exhaust Filters
Quantity: 1 per airstream 10" x 20" x 2" disposable 10" x 20" x 1" disposable
MEF [254 x 508 x 51mm] [254 x 508 x 25mm]
Appendix F
Equipment Data
Appendix G
Airflow Performance Charts
ERV500i
ERV500e
External Static (in. w.g.) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
High speed 648 623 602 592 581 559 541 524 499 473 446
Low speed 541 530 511 499 486 473 459 438 416 385 351
1/4 otor HP for supply and exhaust
External Static (in. w.g.) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Cfm 696 652 609 576 544 507 470 434 399 n/a n/a
1/4 otor HP for supply and 3/4 HP for exhaust

- 19 -
Appendix H
Terminal Control Diagrams
Two types of remote wall controls are available:
1. Standard Wall Control with fan switch and dehu-
midistat control.
2. Xtra Wall Control with fan mode selection, dehu-
midistat control and maintenance indicator.
The remote wall controls work with the integrated elec-
tronic controls within the unit to control ventilation
sequences. Each wall control above has different fea-
tures and requires 4-wire connection to the unit as shown
below. Without the wall control, fans can be operated
with dry contacts or a switch as in control diagram H-4.
NOTE: All controls accessories (Ex. Night setback timer,
CO2controller, enthalpy controller, smoke detec-
tor or wheel rotation sensor) intended to provide
a contact closure for occupancy control across
terminals 3 and 4 cannot be used in conjunction
with the Xtra wall control.
f a wall control is required in addition to any of
these options, only the Standard wall control
may be used. Without these options, a factory
installed jumper across terminals 3 and 4 must
be installed.
Occupancy control is achieved by connection to the ter-
minal interface shown below. These terminals require a
dry contact which could be provided by a number of types
of controls such as a timer, light sensor, occupancy sen-
sor, building management system or other. The unit will
not operate unless these contacts are closed!!
The drawing below shows a factory installed jumper
and programmable timer option.
NOTE: All controls accessories (Ex. Night setback timer,
CO2controller, enthalpy controller, smoke detec-
tor or wheel rotation sensor) intended to provide
a contact closure for occupancy control across
terminals 3 and 4 cannot be used in conjunction
with the Xtra wall control.
f a wall control is required in addition to any of
these options, only the Standard wall control
may be used. Without these options, a factory
installed jumper across terminals 3 and 4 must
be installed.
H-1: Wall Control Connection H-2: Occupied Timer/Sensor Connection
Wall
Control
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
JUMPER
JUMPER
(factory installed)
OCCUPANCY CONTROL
(field installed)
NSB Timer
1
M
2345
JUMPER
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)

- 20 -
Appendix H Continued
Terminal Control Diagrams
YRC
H705A SETPOINT
ENTHALPY CONTROL
(Mounted in outdoor airstream)
Setpoint PN 1604132 (H705A)
Differential PN 1604131 (H705A and C7400A)
FIELD INSTALLED FREE COOLING CONTROL
WITH SINGLE STAGE COOLING
THERMOSTAT
12
3
+SR
S
+TR1TR
To A/C Unit
JUMPER
(Field Supplied)
C7400A SENSOR
added for differential
enthalpy control option.
Mounted in return airstream.
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
YRC
T675A SETPOINT CONTROL
(Mounted in outdoor airstream)
Setpoint PN 1604130 (T675A)
FIELD INSTALLED FREE COOLING CONTROL
WITH SINGLE STAGE COOLING
THERMOSTAT
To A/C Unit
JUMPER
(Field Supplied)
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
R
B
W
Remote fan control can be achieved by connecting dry
contact controls to the terminal interface at terminals
labeled: LOW-COM-H GH (Not all units have two
speeds). Placing a jumper across the 'LOW' and 'COM'
terminals will put the unit in low speed ventilation or plac-
ing a jumper across the 'H GH' and 'COM' terminals will
put the unit into high speed. DO NOT jumper all three
terminals together. These controls could also be the
following: SPDT switch, dehumidistat, CO2sensor, light
sensor, heat sensor, timer, building management system,
etc. The drawing below represents a switch connected to
the unit.
CAUTION: Do not use a wall control and remote fan
switch at the same time. Damage to the
unit may occur.
REMOTE FAN SWITCH
LOW HIGH
NOTE:
CONTROL CONTACTS
CLASS 2 VOLTAGE
WALL CONTROL
BLACK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NOTE:
Connections are all dry contacts
except wall control, wheel alarm
contacts and 24 VAC power contacts.
Use of 24 VAC circuit requires
isolating contacts (ex. thermostat)
to prevent interconnection of
Class 2 outputs.
RED
OCCUPIED
TIMER/
SENSOR
FIELD WIRED
TERMINALS
AB
UNOCC.
RECIRC
CONTACTS
LOW
COMMON
HIGH
DIRTY
FILTER
INDICATOR
(1.5A-24 VAC)
(ERV UNITS)
WHEEL
ALARM
OPTION
(24 VAC)
(ERV UNITS)
ENTHALPY
(-) 24 VAC
(40 VA)
(+) 24 VAC
GREEN
YELLOW
(RECIRC UNITS)
Not all units have two speeds.
Single speed units will be
activated with either LOW-COM
or HIGH-COM connection.
JUMPER
H-3: Enthalpy Control H-4: Remote Fan Control
Setpoint/Differential Enthalpy Control
Thermostat (Drybulb) Control
Energy Recovery Ventilators (ERVs) can be controlled
by an enthalpy controller that switches between free cool-
ing and A/C unit cooling. When free cooling is possible,
the ERV will ventilate without energy recovery (the
enthalpy wheel stops) on a call for cooling. The ventilation
rate is not affected. f the unit is not operating, enthalpy
control contact will initiate low speed ventilation. The
enthalpy control must be connected in conjunction with a
cooling thermostat control to prevent free cooling from
initiating in heating seasons as shown below.