Lifebreath 700ERV Specification sheet

69-ComERV
0114
Energy Recovery Ventilators (ERV)
Now manufactured with
Aircom Electronics
Models
700ERV
1200ERV
Operation and Installation Manual
500ERV

2
The Benefits of ERV............................................................3
Specifications - Model 500ERV .........................................4
Specifications - Model 700ERV .........................................5
Specifications - Model 1200ERV .......................................6
Location of the ERV for Mounting ....................................7
The Ductwork System
Outside Weatherhoods ........................................................8
Stale Air Return System
Fresh Air Supply System
Adjustable Grilles ................................................................9
The Integrated VAC System ...........................................10
Drain Connections
Electrical Connections and Self-Test ................................11
Optional Ventilation Control
Optional 3 Speed Control...................................................12
Optional Dehumidistat
Optional Timers .................................................................13
Dry Contacts ......................................................................14
Function And Controls.......................................................15
Connecting Optional Digital Controls ...............................16
Balancing the ERV ............................................................17
Service/Maintenance ....................................................18-19
Troubleshooting your ERV System .................................. 20
Wiring Diagrams ..........................................................21-22
Warranty ............................................................................23
eave this manual with your customer!
Installing Contractor
Telephone / Contact
Serial Number
Installation Date Model
TO BE COMP ETED BY CONTRACTOR AFTER INSTA ATION
Table of Contents
Assess how the operation of an ERV may
interact with already installed vented
combustion equipment (ie. Gas Furnaces,
Oil Furnaces, Wood Stoves, etc.).
CAUTION
Never install an ERV in a situation where its
normal operation, lack of operation or partial
failure may result in the backdrafting or
improper functioning of vented combustion
equipment!
CAUTION
Do not apply electrical power to the unit until
installation has been fully completed (including
low voltage control wiring).

Energy Recovery Ventilators (ERV) are designed to supply
fresh air to a building while exhausting an equal amount of
stale air from the building. An energy savings is
experienced during the process by reducing the heating (or
cooling) requirements.
ERV - Aluminum Core
During the winter months, the incoming cold fresh air is
warmed by utilizing the heat recovered from the stale air
before it is exhausted to the outdoors. During summer
months when the indoor space is air conditioned, the eat
Recovery Ventilator will help in cooling the incoming fresh
air with the stale air that is being exhausted. ERV - Enthalpic Paper Core
An ERV is designed for use in warm humid areas with
heavy air conditioning use. The ERV will transfer both
sensible and latent heat from the incoming fresh air to the
outgoing stale air thereby reducing the load (due to
ventilation) on the air conditioning system.
ERVs are not suitable for climates where the temperature
drops below -4°C (25°F) for more than 5 days.
3
The Benefits of ERV
• ERVs are not recommended where temperatures
fall below 25°F (-4°C) for more than five
consecutive days.
• ERVs are recommended in regions where high
outdoor humidity requires the operation of air
conditioning/dehumidification systems more
frequently than heating systems.
ATTENTION!
Stale Air
from Building
Stale Air
to Outside
Fresh
Outdoor Air
Fresh Air
to Building

4
Model 500ERV
ENGINEERING DATA
CORES
One modular (two section) aluminum ERV cores and one modular (2 section) ERV core
arranged for high efficiency cross-flow ventilation.
MOTORS
Two PSC, 5 speed double shafted, 120 VAC, 3.15 A motors. (6.3 A total on high speed) with
1/10 hp at 1625 RPM. Total of 610 watts on igh speed.
B OWERS
Centrifugal-type rated at 530 cfm (250 L/s) free air delivery. Each air stream has two
centrifugal blowers driven by four PSC motors.
FI TERS
Washable air filters in exhaust and supply air streams.
DEFROST
Supply bypass damper routes indoor air to defrost cores.
WEIGH 160 lbs. (70 kg) SHIPPING WEIGH 240 lbs. (110 kg)
CONNECTION DUCT SIZES
Four ” x 8” ( 356 mm x 200 mm)
MOUNTING
Unit to be set on support brackets hung by threaded rod-type apparatus (brackets and
rods not included).
CASE
Twenty gauge pre-painted galvanized steel (G60) for superior corrosion resistance. Insulated
with foil faced insulation duct liner where required to prevent exterior condensation.
One drain connection 1/2" (12 mm) OD.
CONTRO S & E ECTRONICS
The Lifestyle MAX Digital Control (99-DXPL01) is included with the unit and can be wall
mounted in a central location of the home. (3 wire) 20 gauge wire (min.) 100' length
Electronic features include:
• 5 Speed Operation on each mode
• 2 user selectable operational modes: Continuous Ventilation, 20 ON/40 OFF
• umidity Control through dehumidistat
• Adjustable Dehumidistat function built into the main wall control
• Built-in Relay for Interfacing to furnace
OPTIONA PROGRAMMAB E CONTRO
99-LS-01 Lifestyle MAX Programmable Control - contains all the features of the
Lifestyle MAX Digital Control with 7/24 programmable ventilation,
(3 wire) 20 gauge wire (min.) 100' length
OPTIONA ACCESSORIES
99-DH-01 Lifestyle Dehumidistat - Initiates high speed ventilation when the indoor
humidity level is above the set point. (3 wire) 20 gauge wire (min.) 100' length
OPTIONA TIMERS
99-DE 01 Lifestyle 20/40/60 Minute imer - Initiates high speed ventilation for
20, 40, or 60 minutes, (3 wire) 20 gauge wire (min.) 100' length
99-20M01 Lifestyle 20 Minute imer - Initiates high speed ventilation for 20 minutes,
(3 wire) 20 gauge wire (min.) 100’ length.
WARRANTY The aluminum core has a fifteen (15) year warranty. The enthalpic core
has a two (2) year replacement parts warranty. The 500ERV carries a
two (2) year replacement parts warranty.
PERFORMANCE
Net supply airflow in cfm (L/s) against
external static pressure
E.S.P cfm L/s
@ 0.1” (25 Pa) 415 (195)
@ 0.2” (50 Pa) 392 (185)
@ 0.3” (75 Pa) 371 (175)
@ 0.4” (100 Pa) 344 (162)
@ 0.5” (125 Pa) 315 (149)
@ 0.6” (150 Pa) 277 (131)
VAC @ 60HZ 120
WATTS / Low speed 187
WATTS / High speed 610
Amp rating 2.9
AIRFLOWS (Each Air Stream)
600 (282)
500 (235)
400 (190)
300 (143)
200 (94)
100 (42)
AIRFLOW CFM (L/s)
25(.1) 50(.2) 75(.3) 100(.4) 125(.5) 150(.6)
EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.)
TOTAL CURRENT DRAW (AMPS) @ 120 VAC
6.3 HIGH
3.1 LOW
70%
60%
50%
300
(143)
400
(190)
500
(235)
282
(600)
TOTAL EFFECTIVENESS
AIRFLOW IN CFM (L/s)
NOTE: Exhaust Relative Humidity (RH) at 40%
EFFECTIVENESS
SPEEDSPEED
55
33
44
22
11
3.8 MED
200
(94)
5 - High Speed
*4 - Medium High Speed
*3 - Medium Speed
*2 - Medium Low Speed
*1 - Low speed
All units conform to CSA and UL standards.
49"
(1245 mm)
8"
(200 mm)
FRONT VIEW
18 3/4"
(475 mm)
28 1/4 "
(717 mm)
14"
(356 mm)
57/8"
(150 mm)
11/4"
(32 mm )
INTERIOR DUCT
CONNECTION SIDE
18 3/4"
(475 mm)
8"
(200 mm)
28 1/4"
(717 mm)
14"
(356 mm)
57/8"
(150 mm)
13/8"
(35 mm)
EXTERIOR DUCT
CONNECTION SIDE
MOUNTING POINTS
DRAIN CONNECTION
EXHAUST AIR
TO OUTSIDE
EXHAUST AIR
FROM BUILDING
SUPPLY AIR
TO BUILDING
SUPPLY AIR
FROM OUTSIDE
NOTE: 
Service clearance
is 30 in. (760 mm)
DEFROST
ENTHALPIC CORE ALUMINUM CORE
Date: ___________________________________________
Tag: _____________________Qty:___________________
Project: _________________________________________
Engineer: _______________________________________
Contractor: ______________________________________
Supplier: ________________________________________
Quote#: _________________________________________
Submitted by: ____________________________________
[email protected]
T1-855-247-4200
F1-800-494-4185
ERVs are not recommended for regions where the design
temperature is below 25ºF (-4ºC).
NOTE: All specifications are
subject to change without
notice.

[email protected]
T1-855-247-4200
F1-800-494-4185
ATENT RECOVERY (MOISTURE) TRANSFER CORES
Modular (2 section) enthalpic (moisture) transfer cores arranged for
efficient cross-flow ventilation.
MOTORS
Two PSC, 3 speed single shafted, 120 VAC, 2.75 Amps each
(5.5 total on high speed). HP - 1/10, 1625 RPM. Watts - total on high
speed - 648.
FI TERS
Washable air filters in exhaust and supply air streams.
B OWERS
Centrifugal type rated at 700 CFM (329 L/s) free air delivery. Each air
stream has one single shafted motor driving a centrifugal blower.
CONNECTION DUCT SIZES
Four - 14" x 8" (356 mm x 200 mm)
MOUNTING
Unit to be set on support brackets hung by threaded rod type
apparatus (brackets and rods not provided).
CASE
20 gauge prepainted galvanized steel ( 60) for superior corrosion
resistance. Insulated with foil faced insulation where required to
prevent exterior condensation.
E ECTRONICS
Integrated microprocessor circuit board. Built-in interlock contacts.
Automatic Self Test. Optional remote speed control.
DEFROST CONTRO S
Fan Defrost— Interrupts the supply air while the exhaust air defrosts
the core.
WEIGHT 150 lbs (70 kg) SHIPPING WEIGHT 200 lbs. (90 kg)
OPTIONA CONTRO S
99-500 3 Speed Control - 3 Speed Fan setting (Low/Medium/High)
(4 wire) 20 gauge wire (minimum)
99-BC-01 Ventilation Control - 2 Speed Fan setting (Low/High) -
Dehumidistat (3 wire) 20 gauge wire (minimum)
OPTIONA TIMERS
99-DET01 20/40/60 Minute Timer - Initiates high speed ventilation
for 20, 40, 60 minutes. (3 wire) 20 gauge wire (minimum)
99-20M01 20 Minute Timer - Initiates high speed ventilation for 20
minutes. (3 wire) 20 gauge wire (minimum)
AIRFLOWS (Each Air Stream)
900 (423)
800 (378)
700 (329)
600 (282)
500 (235)
400 (190)
300 (143)
200 (94)
100 (42)
AIRFLOW CFM (L/s)
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7)
EXTERNAL STATIC PRESSURE IN PASCALS (IN. W.C.)
TOTAL CURRENT DRAW (AMPS) @ 120 VAC
5.5 HIGH
4.7 LOW
60%
50%
40%
300
(143)
400
(190)
500
(235)
600
(282)
700
(329)
TOTAL EFFECTIVENESS
AIRFLOW IN CFM ( L/s )
NOTE: Exhaust Relative Humidity (RH) at 40%
EFFECTIVENESS
HIGH SPEEDHIGH SPEED
MED SPEEDMED SPEED
LOW SPEEDLOW SPEED
5.0 MED
PERFORMANCE
ENTHALPIC CORE
SUPPLY AIR
FROM OUTSIDE
Note: Service clearance
is 30 in. (760 mm)
EXHAUST AIR
FROM BUILDING
“
FRONT VIEW
SUPPLY AIR
TO BUILDING
EXHAUST AIR
TO OUTSIDE
“)
CONTROLS
“
“
“
“
DISCHARGE SIDE
““
MOUNTING POINTS
“
“
“
“
INLET SIDE
DIMENSIONS inches (mm)
Date: ___________________________________________
Tag: _____________________Qty:___________________
Project: _________________________________________
Engineer: _______________________________________
Contractor: ______________________________________
Supplier: ________________________________________
Quote#: _________________________________________
Submitted by: ____________________________________
OPTIONA ACCESSORIES
99-DH-01 Remote Wall Dehumidistat - Initiates high speed
ventilation when the indoor humidity level is above the
set point. (3 wire) 20 gauge wire (minimum)
WARRANTY
All units carry a 5 year warranty on the energy recovery cores and
a 2 year replacement parts warranty.
Model 700ERV
5
NOTE: All specifications are subject to change without notice.

6
[email protected]
T1-855-247-4200
F1-800-494-4185
ATENT RECOVERY (MOISTURE) TRANSFER CORES
Modular (3 section) latent recovery (moisture) transfer cores arranged
for efficient cross-flow ventilation.
MOTORS
Two PSC, 3 speed double shafted, 120 VAC, 4 Amps each
(8.1 total on high speed). HP - 1/4, 1625 RPM. Watts - total on high
speed - 972.
FI TERS
Washable air filters in exhaust and supply air streams.
B OWERS
Centrifugal type rated at 1200 cfm (566 L/s) free air delivery. Each air
stream has one double shafted motor driving a centrifugal blower.
CONNECTION DUCT SIZES
Four - 20" x 8" (508 mm x 200 mm).
MOUNTING
Unit to be set on support brackets hung by threaded rod type
apparatus. (brackets and rod not provided).
CASE
20 gauge prepainted galvanized steel ( 60) for superior corrosion
resistance. Insulated with foil faced insulation where required to
prevent exterior condensation.
E ECTRONICS
Integrated microprocessor circuit board. Built-in interlock contacts.
Automatic Self Test. Optional remote speed control.
DEFROST CONTRO S
Fan Defrost— Interrupts the supply air while the exhaust air defrosts
the core.
WEIGHT 200 lbs. (90 kg) SHIPPING WEIGHT 270 lbs. (120 kg)
OPTIONA CONTRO S
99-500 3 Speed Control - 3 Speed Fan setting (Low/Medium/High)
(4 wire) 20 gauge wire (minimum)
99-BC-01 Ventilation Control - 2 Speed Fan setting (Low/High) -
Dehumidistat (3 wire) 20 gauge wire (minimum)
OPTIONA TIMERS
99-DET01 20/40/60 Minute Timer - Initiates high speed ventilation for
20, 40, 60 minutes. (3 wire) 20 gauge wire (minimum)
99-20M01 20 Minute Timer - Initiates high speed ventilation for
20 minutes. (3 wire) 20 gauge wire (minimum)
ENTHALPIC CORE
SUPPLY AIR
FROM OUTSIDE
NOTE:
Service clearance
is 30 in. (760 mm)
from front
access door
EXHAUST AIR
FROM BUILDING
EXHAUST AIR
TO OUTSIDE
SUPPLY AIR
TO BUILDING
“
CONTROLS
“
“
“
“
“
““
““
“
“
DISCHARGE SIDE INLET SIDE FRONT VIEW
AIRFLOWS (Each Air Stream)
1300 (613)
1200 (566)
1100 (518)
1000 (472)
900 (423)
800 (378)
700 (329)
600 (282)
500 (235)
AIRFLOW CFM (L/s)
25 (.1) 50 (.2) 75 (.3) 100 (.4) 125 (.5) 150 (.6) 175 (.7)
EXTERNAL STATIC PRESSURE IN PASCALS (in. W.C.)
TOTAL CURRENT DRAW (AMPS) @ 120 VAC
7.8 MED
8.1 HIGH
7.1 LOW
60%
50%
40%
500
(235)
600
(282)
700
(329)
TOTAL EFFECTIVENESS
AIRFLOW IN CFM ( L/s )
EFFECTIVENESS
HIGH SPEEDHIGH SPEED
MED SPEEDMED SPEED
LOW SPEEDLOW SPEED
800
(378)
900
(423)
1000
(472)
1200
(566)
1100
(518)
NOTE: Exhaust Relative Humidity (RH) at 40%
PERFORMANCE
DIMENSIONS inches (mm)
Date: ___________________________________________
Tag: _____________________Qty:___________________
Project: _________________________________________
Engineer: _______________________________________
Contractor: ______________________________________
Supplier: ________________________________________
Quote#: _________________________________________
Submitted by: ____________________________________
OPTIONA ACCESSORIES
99-DH-01 Remote Wall Dehumidistat - Initiates high speed
ventilation when the indoor humidity level is above the
set point. (3 wire) 20 gauge wire (minimum)
WARRANTY
All units carry a 5 year warranty on the energy recovery cores and
a 2 year replacement parts warranty.
Model 1200ERV
NOTE: All specifications are subject to change without notice.

7
ocation of the ERV for Mounting
The ERV must be located in a heated space where the
surrounding air temperature does not fall below 60°F
(16°C). The unit must be mounted level (horizontal) to
obtain proper drainage of water from the heat exchange
element and drip pans. The warranty will be void if these
conditions are not met.
Typically, the ERV is positioned close to an outside wall or
the roof to simplify the connections and keep the length of
insulated ducting required for the fresh air intake to a
minimum.
A minimum clearance of 30 inches (76 cm) in front of the
ERV is recommended to service the heat exchanger cores
and the filters. The ERV may be mounted on an equipment
platform providing the drain hoses are clear and there is
sufficient space to open the doors for servicing.
Saddle Installation
Hang unit with suspended rods
and "U" channel members.
Threaded
rod and U channel
(Supplied by others)
Vibration Isolators
(Supplied by others)
Curb Mounted
Mount unit on wooden or metal
curb assembly. Unit must be raised
an adequate height for installation
and slope of drain lines.
Curb is wood or metal
(Supplied by others) May be anchored to
floor,leaving space
for drain connections
Vibration Isolators
(Supplied by others)
Flexible duct connectors should be installed
between the EVR and the galvanized ductwork.
ATTENTION

The weatherhoods must have built-in “bird” screen with
1/4 in (6.35 mm) minimum mesh to prevent birds and
rodents from entering into the ductwork. Do not use smaller
mesh as it will be very susceptible to plugging up. Gravity
dampers at the vents must not be used as they will restrict
air flow and often “seize up”. The preferred location of the
outside weatherhoods is:
• no less than 10 ft. (3 m) apart from each other
• at least 18 in (46 cm) above snow line or ground level
• away from sources of contaminants, such as
automobile exhaust fumes, gas meters, garbage cans,
containers, etc.
• not exposed to prevailing winds
The outside perimeter of the weatherhood must be caulked
to prevent leakage into the building.
The design and size of the weatherhoods or louvers chosen
by the installer must allow for adequate free area. Water and
debris penetration of the system is minimized when the
airflow does not exceed 1000 FPM (5.08 m/s) free area
velocity.
Ducting from the Weatherhoods
Galvanized sheet metal ducting with sufficient cross section
with an integral single piece vapor barrier should be used to
connect the ERV to the weatherhoods. All ducting must
meet UL Class 1 requirements.
A minimum R value of insulation should be equal to
4 (RSI 0.75)
A good bead of high quality caulking (preferably acoustical
sealant) and taping with a high quality aluminum foil tape is
recommended to seal the duct to both the ERV and the
weatherhood.
A properly designed ducting system will allow the ERV to
operate at its maximum efficiency. (Air flow will be
restricted by undersized ducting, use of too many elbows,
tees, bends, etc.). Always try to keep duct runs as short and
straight as possible.
NO E: Fully insulated ducting with an integral vapor
barrier must be used on all runs passing through
unheated areas in order to avoid condensation
problems and energy losses from the air steams.
All joints must be airtight, sealed and impervious to
moisture. See specification sheets for each unit for exact
duct sizes and location.
To minimize pressure drop and noise, galvanized metal
ducts, properly sized, are recommended. Keep ducting as
short as possible and use a minimum of elbows and tees.
Connecting sections and shorter runs may be flexible
ducting one size larger than the metal equivalent. Use
flexible duct connectors at the ERV to avoid noise
transmission.
All duct joints must be secured with screws, rivets or duct
sealant and sealed with aluminum duct tape to prevent
leakage.
The Ductwork System
Outside Weatherhoods
Fully insulated ducting with an integral
vapour barrier must be used on all runs
passing through unheated areas in order to
avoid condensation problems and energy
losses from the air systems.
ATTENTION
8

The fresh air supply ductwork from the ERV may be
directly connected to the return air duct of the forced air
system. Check the air flow balance of the ERV with the air
handler blower both “ON” and “OFF” to determine that it
does not imbalance the ERV more than 10%. Also, it is
advisable to include a short length of flex duct or other non-
metallic connector in this hard ducted line in order to keep
the ERV acoustically isolated and separately grounded
(electrically) from the air handler. This will avoid a possible
shock hazard to service people if a short to ground develops
in one of the devices.
It may be necessary to install a separate fresh air supply
ductwork system if the heating is other than forced air.
When installing an ERV, the designer and installer should
be aware of local codes that may require smoke detectors
and/or firestats in the VAC or ERV ductwork.
Because an ERV is designed to bring fresh air into the
building, structures may require supply voltage interrupt
when smoke or flame sensors are triggered, or when a
central fire alarm system is activated.
Supply air grilles may be ceiling or high wall mounted.
Avoid locating incoming fresh air grilles that could cause a
direct draft on the occupants as the incoming air may be
below room temperature. A reheat duct heater can be
installed to improve occupant comfort.
The stale air return system is used to draw air from the
points in the building where the worst air quality problems
occur. Balancing dampers and/or adjustable grilles are
recommended on all return air lines which are used during
installation to help balance the “draw” from different areas
of the building.
Alternately, the stale air may be drawn directly from the
return air duct. When this system is used, the air handler’s
blower must constantly operate. The exhaust take-off
connection must be at least 3 ft (1 m) from a directly
connected ERV supply duct if both are connected to the
same duct run. Note and compensate for the static pressure
of the air handlers return system if the static pressure of the
return in the air handler exceeds .1 to .15” W.C.
A damper located just prior to the ERV is required to
balance the stale air exhausted with the fresh air supply
entering the building.
Return air suction points should be located on the opposite
side of the room from the fresh air inlet. The inlets may be
located in the ceiling or high on the walls and fitted with
inlet grilles.
Many commercial activities produce air contaminants in the
form of dusts, fumes, mists, vapors and gases.
Contaminants should be controlled at the source so they are
not dispersed through the building or allowed to increase to
toxic concentration levels. The ventilator allows for
economical operation of the VAC system while
effectively removing contaminants from the space. In
designing the exhaust portion of the system the exhaust
grilles are situated to remove the contaminants while not
allowing them to enter the breathing zone of the occupants.
For contaminants lighter than air, grilles should be located
high on the wall. If contaminants are heavier than air, a
lower placement of the grilles will be required. Information
on a contaminants specific gravity and toxicity should be
available from chemical data sheets.
Stale Air Return System
Fresh Air Supply System
Adjustable Grilles
The use of balancing dampers or adjustable grilles as
supply air diffusers and air exhaust covers are
recommended. TEC GRILLES™ are round, efficient,
sound absorbing devices available in 4”, 5”, 6” and 8”
(100, 125, 150, and 200 mm) models.
Part# 99-EAG4 4” diameter Techgrille
Part# 99-EAG5 5” diameter Techgrille
Part# 99-EAG6 6” diameter Techgrille
Part# 99-EAG8 8” diameter Techgrille
9

ECONOMIZER
HRV/ERV FRESH
AIR SUPPLY
HRV/ERV UNIT
STALE AIR
EXHAUST TO HRV/ERV
SUPPLY DUCT
RETURN AIR DUCT or
BREATHER T
ROOFTOP
UNIT
B.D.
B.D.
E l l D i i l
FRESH AIR
SUPPLY
STALE AIR
EXHAUST
FRESH AIR
SUPPLY
STALE AIR
EXHAUST
HRV/ERV FRESH
AIR SUPPLY
HRV/ERV UNIT B.D.
B.D.
STALE AIR EXHAUST
ECONOMIZER
ROOFTOP
UNIT
12” BREATHER
SPACE
ROOF DECK
CEILING RETURN AIR PLENUM SUPPLY DUCTWORK
Figure A
Figure B
The ERV has become an integral component of the VAC
system. Figure A shows an ERV unit providing fresh air
directly to the return air plenum of a rooftop heat/cool unit.
In the balanced airflow system, the ERV exhaust removes
stale room air (eg. from lunch room, storage or copy area)
and returns to the space an equal amount of fresh outdoor
air, making the use of an economizer obsolete in
conjunction with an ERV.
Many buildings have ceiling return air plenum as in Figure
B. Fresh air from the ERV can be introduced directly into
the ceiling space but this should occur near the air handler’s
intake.
By operating the ERV on a 24 hour/7 day battery backed
timer, the unit can be set to operate only when occupancy or
indoor conditions require the air exchange.
In installations where it is satisfactory to provide general
exhaust from the space, the air to be exhausted may be taken
directly from the return air plenum to the ERV as it is drawn
back to the air handler. Fresh air supplied by the ERV is
then introduced directly into the return air plenum but at a
location closer to the air handler. The air handler would
have a constant running blower to effectively distribute the
fresh air and remove the stale air. Balancing dampers would
be located in both the ERV supply and exhaust ducts
between the return air plenum and the ERV.
NOTE: At no time should the air handler T.E.S.P. on the return
duct exceed that of the ERV .
The Integrated HVAC System
When interlocking a rooftop unit with an ERV,
ensure the fans of both units operate in the
correct rotation.
CAUTION
10

The ERV must be level for proper drainage of condensate
from the drain pans.
Install a loop or "P Trap" in the condensate line and pour a
cup of water into the drain pan. This will create a water seal
which will prevent odors from being drawn up the hose and
into the fresh air supply of the ERV.
Install the drain pans in the bottom so the drain connections
protrude through the holes provided. Use drain hoses with
hose clamps to connect the drain pan outlets to a floor drain
or standpipe. Make sure the drain line slopes down to the
outlet. If this is not possible, a condensate pump will be
required for positive removal of the water. Protect the drain
line from freezing.
Drain Connections
Electrical Connections and Self Test
Electrical Connections
It is recommended that a licensed electrician make all
electrical connections. It is very important that the unit be
properly grounded. It is recommended that a separate
15 amp/120 volt circuit be used.
WARNING: In order to prevent electric shock when
cleaning or servicing the ERV, it is extremely important to
confirm the polarity of the power line that is switched by the
safety (disconnect) switch whose control arm is located on
the outside of the electrical control box area. The hot line
(black) is the proper line to be switched. To confirm the
proper polarity, use a voltmeter or test lamp to make sure
there is no power after the switch when the door is open.
Check between that point and ground
(on the cabinet). This must be done as occasionally some
buildings are improperly wired. Always make sure the ERV
is properly grounded.
Automatic Self Test - (DD Models)
Unit will perform a self test each time power is first applied.
Approximate duration - 1 minute.
1. Unit will cycle both blower assemblies through all
three speeds holding each speed for 15 seconds. Damper
is in ventilation position.
2. Unit will power the damper motor.
3. Self test ends and normal operation resumes.
Automatic Self Test - (FD Models)
Unit will perform a self test each time power is first applied.
Approximate duration - 2 minutes.
1. Unit will cycle both blower assemblies through all three
speeds holding at each speed for 15 seconds.
2. Both blower assemblies shut down for 30 seconds.
3. Unit will run only the upper blower assembly through all
three speeds holding at each speed for 15 seconds.
4. Self test ends and normal operation resumes.
DRAIN
SPOUT
TAPE
TO DRAIN
TEE
CONNECTOR
DRAIN
SPOUT
HRV CABINET
All condensate lines must be installed in a space
where the temperature is maintained above the
freezing point or freeze protection must be
provided.
CAUTION
Drain trap and tubing MUST be below
bottom of door with 1/4" per foot
downwards slope away from unit.
CAUTION
Forming the “P” Trap
11

Optional 3 Speed Control - Part #99-500
Optional Ventilation Control Part #99-BC-01
The optional 2 speed Ventilation Control offers ON/OFF, igh
Speed/Low speed plus an electronic dehumidistat.
Key Features
• 2 Speed Fan setting (Low/ igh)
• Electronic Dehumidistat
• Instruction Card is inserted in the control
• Slim-line design
• Connect to 3 wire 20 gauge low voltage wire.
Turning on the Control
Press and release the ON/OFF button. The "ON Indicator Light" will
illuminate.
Adjusting the Ventilation Speed
The unit will normally operate at low speed. Press and release the
SPEED button to initiate high speed ventilation. The " igh Speed
Indicator LED" will illuminate.
Humidity Control
Your unit will produce a dehumidifying effect when outdoor humidity
levels are lower than indoor humidity levels. Never use the
dehumidistat feature when outdoor temperatures are above 59 F (15 C).
Setting the Dehumidistat
Press and release the DE UMIDISTAT button until the
DE UMIDISTAT LED is at the desired setting. After 5 seconds the
dehumidistat light will either flash or be on continuous.
A flashing light indicates the humidity level is higher than the setting
and the unit is operating on high speed ventilation. A continuous light
indicates the humidity level is lower than the setting. Refer to the unit's
Operation & Installation Manual for instructions on how the
Dehumidistat works.
Note - Only 1 dehumidistat should be active on a system.
HIGH
OFF
OFF
OFF
MED
LOW
The Optional 3 Speed Control offers ON/OFF and
high/medium and low speeds - 3 Speed Fan setting
(Low/Medium/ igh)
(4wire) 20 gauge wire (minimum)
- Connect to Red, White, Yellow, Green.
%
80
20
HIGH
Instruction card
Dehumidistat
Indicator LEDs
ON/OFF
button
High/Low
Speed
button
High Speed
Indicator LED
On
indicator
light
12

Key Features
• The Dehumidistat measures the indoor humidity level and will
initiate high speed ventilation when the moisture level in the
building exceeds the set point on the control.
• Once the humidity in the building is reduced, the ERV will revert
back to its previous setting.
• The Dehumidistat should be set to OFF for all season except the
heating season.
• Connect to 3 wire 20 gauge low voltage wire.
Humidity Control
Your ERV will produce a dehumidifying effect when outdoor humidity
levels are lower than indoor humidity levels. Never use the
dehumidistat feature when outdoor temperatures are above 59 F (15 C).
Note: The indoor humidity level is measured at the control.
Setting the Dehumidistat
Press and release the DE UMIDISTAT button until the
DE UMIDISTAT LIG T is at the desired setting. After 5 seconds the
dehumidistat light will either flash or be on continuous.
A flashing light indicates the humidity level is higher than the setting
and the unit is operating on high speed ventilation. A continuous light
indicates the humidity level is lower than the setting. Refer to the unit's
Operation & Installation Manual for instructions on how the
Dehumidistat works.
Note - Only 1 dehumidistat should be active on a system.
Optional Dehumidistat - Part #99-DH-01
%
80
20
Instruction card
Dehumidistat Indicator
EDs
Set to the desired humidity
level. igh speed ventilation
will initiate when the indoor
moisture level exceeds the set
point on the control.
Dehumidistat
Adjust button
ifestyle 20/40/60 Minute Timer
Part # 99-DE 01
Initiates high speed ventilation for 20, 40 or 60 minutes. The 20/40/60
Minute Status Lights indicate high speed operation.
Lockout Mode is useful if you wish to disable the timer. Set lockout by
holding the Select Button for 5 seconds. Unlock by holding for
5 seconds.
Connect to 3 wire 20 gauge low voltage wire. Mounts in a standard
2" x 4" electrical box.
ifestyle 20 Minute Timer
Part # 99-20M01
Initiates high speed ventilation for 20 minutes. The 20 Minute Status
Light indicates high speed operation.
Lockout Mode is useful if you wish to disable the timer. Set lockout by
holding the select button for 5 seconds. Unlock by holding for
5 seconds.
Connect to 3 wire 20 gauge low voltage wire. Mounts in a standard
2" x 4" electrical box.
Optional Timers
Select Button
Select Button
20/40/60 Minute
Status Lights
20 Minute
Status Lights
The timer will override the Operational Mode (regardless of the
settings) and initiate high speed ventilation. Upon completion of the
timer cycle, the ERV will return to your selected Operational Mode
and speed setting.
13

14
Interlocking the ERV to an Air handler/Furnace Blower
Connecting the ERV as illustrated will ensure the Air
andler/Furnace Blower Motor is operating whenever the
ERV is ventilating.
The ERV must be interlocked to the Furnace/Air andler
with a Simplified Installation (Return/Return Installation)
and should be interlocked with a Partially Dedicated
Installation.
Wire
Connector
Furnace Terminal Strip
Furnace
Thermostat
HRV Terminal Block
Operating the ERV without a Main Control and Adding Dry Contact Controls
CAUTION
Consideration should be given to competing
airflows when connecting the ERV in
conjunction with an Air Handler/Furnace
Blower system.
Setting “Standby” when using a Main Control
CAUTION
Building codes in some areas require
“fully-off” functionality. Check with
your local building authority before
modifying the unit to “standby -off”.
Unintentional operation of the ERV by
the end user may occur if the unit is
modified from “fully-off” to “standby-
off”.
The ERV will be “fully-off” when the OFF
position is selected on the Main Control.
Timers and /or other controls will not function
when the ERV is in the OFF position.
The “fully-off” feature can be modified to
“standby-off” by adding a jumper on the
Terminal Block between 2 (ON) and 3 (RED).
“Standby” can also be achieved by setting the
main control to the ON position and selecting
speed 0*. Timers and /or additional controls
will initiate high speed ventilation when
activated.
* Speed 0 is not available on all controls The Terminal Block
(located on the ERV)
A jumper must be in place between 2 (ON) and
3 (RED) on the Terminal Block to activate the
ERV for timers and/or dry contact controls.
Adding Dry Contact Controls
Low Speed - A jumper between 2 (ON) and
1 (LOW) initiates low speed ventilation.
High Speed - A jumper between 2 (ON) and
6 ( I) initiates high speed ventilation.
Dehumidistat - A dry contact for a dehumidistat
is connected between 2 (ON) and 10 (BLK).
The Terminal Block
(located on the ERV
The ERV must have a Jumper in place
between 2 (ON) and 3 (RED) on the
Terminal Block when installing the unit
without a Main Control.

Function and Controls
HIGH
OFF
OFF
OFF
MED
LOW
T30
SW1
T29T28REDOGYWRCT25
T17
K3 K4 K5
COM
N.O.
K6
COM
N.O.
COM
N.O.
COM
N.O.
T18 T19
T20
RELAY
FEED
T43
SPARE
T26 T27 GRNYEL
P2 P3
R
24Vac12Vac Com
Thermostat DET
C
Defrost
Freeze
Fan Hi Fan Med Fan Low
ON
P1
C4 C3
K7 K1 K2K8
8 7 6 5 4 3 2 1
C2 C1
T31
T32
T33
T34
T35
T36
T37
T38
T39
T40
T41
T42
Contact 1
N.0. COM N.C. N.0. COM N.C. N.0. COM N.C. N.0 . COM
Contact 2 Contact 3 Contact 4
DIP SWITCHES TO BE
ADJUSTED BY QUALIFIED
TECHNICIANS ONLY.
N.C
Digital Controls
CHASSIS
T44
T21 T22 T23 T24
AUX 1 AUX 2
T3 T4 T5 T6
Line/Ligne
T1 T2 T13 T14 T15 T16
Neutral/Neutre
T11 T12
2 AMPS
%
80
20
HIGH
SEUL UN TECHNICIEN
QUALIFIÉ PEUT AJUSTÉ LES COMMUTATEURS DIP.
Basic Functions
Speed control is obtained by powering 24V to one of
the designated speed taps.
Example:
A jumper between the Rterminal and the
Gterminal will result in low speed operation.
Setup
Select appropriate operational speed by installing the
jumper wire between one of the designated speed taps.
(A jumper wire is factory installed in the low speed
position.)
Note:
It is recommended to use the optional speed control
Part # 99-500 in order to obtain 3 speed fan control.
Optional Digital Electronic
Timer (DET) Part #99-DET01
Connect up to 4 (maximum)
Boosts to high speed for 20, 40,
60 minutes
Connect to Yellow, Red & reen
Refer to “Connecting Optional
Digital Controls” in this manual
for instructions on connecting the
optional Ventilation Control
(Part# 99-BC-01) and optional
Remote Wall Dehumidistat
(Part# 99-DH-01)
Connect to Yellow, Red & reen
Optional Speed Control (Part #99-500)
Connect to Red, White, Yellow, reen
Micro Processor Board
Front View Back View
OGYWRC
Thermostat
24V
Jumper
Wire
HIGH
MED
LOW
Jumper Wire
Placement
on Micro
Processor
Board
SPEED
High R W
Medium R Y
Low R G
JUMPER
15

Connecting Optional Digital Controls
Standard Series Controls may be installed onto a flush mounted
2" x 4" electrical switch box or it may be surface mounted onto a
wall.
Only 1 master control should be installed to a ventilation system
(the Face Plate on this illustration may not be exactly the same as
yours).
1. Remove the Operating Instructions Card from the top of the
Control (Figure A).
2. Separate the Face Plate from the Back Plate by firmly pulling
apart (Figure B). Be careful not to damage Face Plate Contact
Pins.
3. Place the Back Plate of the control in the desired location on
the wall and pencil mark the wall in the center of the Wire
Opening, Top Scre Hole and Bottom Scre Hole (Figure C).
4. Remove the Back Plate and drill a 3/8" opening in the wall to
allow for the Wire Opening and a 1/8" hole for the Wall
Anchors for the top and bottom screw holes (Figure D).
5. Pull 3/20 wire through the opening in the wall and the Wire
Opening of the Back Plate (Figure C).
6. Connect Red, Green and Yellow to the Wiring Terminals
located on the Back Plate (Figure C).
7. Secure a single wire to the Wire Retainer located on the Back
Plate (Figure C).
8. Attach the Back Plate to the wall using the 2 supplied screws
and anchors.
9. Attach the Face Plate to the Back Plate (Figure B).
Note: Be careful to correctly align the Face Plate to avoid
damaging the Face Plate Contact Pins.
10. Insert the Operating Instructions Card into the control
(Figure A).
11. Connect the 3/20 wire to the Terminal Block located on
ventilator (Figure E).
%
80
20
HIGH
ATTENTION
Pay special attention not to damage the Contact
Pins when attaching and detaching the Face Plate.
(Figure B)
Operating
Instructions Card
Figure A -
Face Plate
(Illustration of Face
Plate may vary from
actual control)
Back
Plate
Figure B
Face Plate
Contact
Pins
Face
Plate
Separate the
Face Plate from
the Back Plate.
Side View
P
Figure C
Front View of Back Plate
Wire
Opening
Wiring
Terminals
Wire
Retainer
TOP
Top Screw
Hole
Bottom
Screw Hole
Drill a 1/8” hole
for the Top Screw
and Anchor
Figure D
Drill holes in wall
Drill a 3/8” hole
for the Wire
opening
Drill a 1/8” hole
for the Bottom
Screw and
Anchor
F
Correct Installation
of Back Plate
Wall Face
Dehumidistat Sensor
Openings to room
air allow accurate
sensor readings.
Figure F
Back
Plate
Face Plate
Contact
Pins
Face
Plate
REDGRNYEL
DET
Digital Controls
Figure E
Connect optional digital controls
to the Digital Controls terminal
strip located on the Aircom
Circuit Board.
• Yellow to YELLOW
• Red to RED
• Green to GREEN
Use 3/20 wire
The Aircom terminal strip
located on the Aircom
circuit board.
16

It is necessary to have balanced air flows in an ERV. The volume of
air brought in from the outside must equal the volume of air
exhausted by the unit. If the air flows are not properly balanced,
then;
• The ERV may not operate at its maximum efficiency
• A negative or positive air pressure may occur in the house
• The unit may not defrost properly
• Failure to balance ERV properly may void warranty
Excessive positive pressure may drive moist indoor air into the
external walls of the building where it may condense
(in cold weather) and degrade structural components. May also
cause key holes to freeze up.
Excessive negative pressure may have several undesirable effects.
In some geographic locations, soil gases such as methane and
radon gas may be drawn into the home through basement/ground
contact areas. Excessive negative pressure may also cause the
backdrafting of vented combustion equipment.
Prior to balancing, ensure that:
1. All sealing of the ductwork system has been completed.
2. All of the ERV's components are in place and functioning
properly.
3. Balancing dampers are fully open.
4. Unit is on HI H speed.
5. Air flows in branch lines to specific areas of the house should be
adjusted first prior to balancing the unit. A smoke pencil used at
the grilles is a good indicator of each branch line's relative air
flow.
6. After taking readings of both the stale air to the ERV duct and
fresh air to the house duct, the duct with the lower CFM ([L/s]
velocity) reading should be left alone, while the duct with the
higher reading should be dampered back to match the lower
reading.
7. Return unit to appropriate fan speed for normal operation
Balancing Procedure
The following is a method of field balancing an ERV using a Pitot
tube, advantageous in situations when flow stations are not installed
in the ductwork. Procedure should be performed with the ERV on
high speed.
The first step is to operate all mechanical systems on high speed,
which have an influence on the ventilation system, i.e. the ERV itself
and the forced air furnace or air handler if applicable. This will
provide the maximum pressure that the ERV will need to overcome,
and allow for a more accurate balance of the unit.
Drill a small hole in the duct (about 3/16"), three feet downstream of
any elbows or bends, and one foot upstream of any elbows or
bends. These are recommended distances but the actual installation
may limit the amount of straight duct.
The Pitot tube should be connected to a magnehelic gauge or other
manometer capable of reading from 0 to 0.25 in. (0-62 Pa) of water,
preferably to 3 digits of resolution. The tube coming out of the top of
the pitot is connected to the high pressure side of the gauge. The
tube coming out of the side of the pitot is connected to the low
pressure or reference side of the gauge.
Insert the Pitot tube into the duct; pointing the tip into the airflow.
For general balancing it is sufficient to move the pitot tube around in
the duct and take an average or typical reading. Repeat this
procedure in the other (supply or return) duct. Determine which duct
has the highest airflow (highest reading on the gauge). Then
damper that airflow back to match the lower reading from the other
duct. The flows should now be balanced. Actual airflow can be
determined from the gauge reading. The value read on the gauge is
called the velocity pressure. The Pitot tube comes with a chart that
will give the air flow velocity based on the velocity pressure
indicated by the gauge. This velocity will be in either feet per minute
or meters per second. To determine the actual airflow, the velocity is
multiplied by the cross sectional area of the duct being measured.
This is an example for determining the airflow in a 6" duct.
The Pitot tube reading was 0.025 inches of water.
From the chart, this is 640 feet per minute.
The 6" duct has a cross sectional area of = [3.14 x (6"÷12)2]÷4
= 0.2 square feet
The airflow is then:
640 ft./min. X 0.2 square feet = 128 cfm
For your convenience, the cross sectional area of some common
round duct is listed below:
DUCT DIAM. (inches) CROSS SECTION AREA (sq. ft.)
5 0.14
6 0.20
7 0.27
The accuracy of the air flow reading will be affected by how close to
any elbows or bends the readings are taken. Accuracy can be
increased by taking an average of multiple readings as outlined in
the literature supplied with the Pitot tube.
MAGNEHELIC
DUCT
AIR FLOW
Pitot tube
Magnehelic gauge
Pitot tube and gauge
Pitot Tube Air Flow Balancing Kit
c/w magnehelic gauge, Pitot tube, hose and
carry case.
PART NO. 99-167
Place pitot tube a minimum of 18" from blower or elbows
Note: Duct connections may vary,
depending on model.
Outdoors
MAGNEHELIC
Magnehelic
gauge
Pitot
tube
MAGNEHELIC
Magnehelic
gauge
Pitot
tube
Balancing
Damper
Balancing
Damper
Measure Exhaust Air from Building Measure Supply Air to Building
TI-74-2C
0105
Balancing the ERV Pitot Tube Airflow Balancing
17

Servicing your ERV on a regular schedule will result in
optimum operating efficiencies and prolonged life of the
equipment.
Due to numerous applications in which this equipment can
be installed, it is difficult to predict servicing intervals. In
certain situations where there is heavy smoke, servicing the
equipment every one - two months may be needed; whereas
ventilating a meeting room for carbon dioxide may only
need service every six months to a year.
Motor
Access to the motor is through the front service doors. Note
heat exchanger core can be removed to provide more room.
See CORE in this section.
The motor is a permanent split capacitor type (PSC) which
uses a sleeve mechanism to steady the shaft. There is an oil
wick beside the sleeve which supplies oil to it on a
continuous basis.
If the motor does not have oil tubes, no maintenance is
required.
Access to the wick is through oil tubes, (two per motor)
located in the motor case itself. These oil tubes are either
capped with yellow plugs, (which need to be removed for
oiling) or have clear tubes protruding from them.
In either case an oiling device such as an “Oil Telespout”
filled with 20 S.A.E. non-detergent electric motor oil should
be used to put oil inside the tubes. A couple of drops of oil
once a year will do. DO NO OVER OIL!
ERV Core
Remove core and vacuum or use low pressurized air to
clean core. Do not wash or submerse in water.
With the core in its proper position, place the bottom corner
into its guide rail support, then place the left side, the right
side and finally the top corner into place in the same
fashion. Once the core is in place, push the core evenly into
the cabinet until it reaches the back.
Note the core will protrude slightly out from the front of the
cabinet, this is so the access door, when closed, ensures a
tight fit.
When remo ing cores and filters note their location and arrangement.
Service and Maintenance
SINGLE DRIP
EDGE CORE
FILTER
FILTER
LEFT DRIP
EDGE
DRAIN
PAN RIGHT DRIP
EDGE
angement.
Models 700, 1200 Model 500
18
DRAIN PANS (not on all models)
FILTER
FILTER
DOUBLE
DRIP
EDGES
DOUBLE
DRIP EDGE
CORE

Filters
Open front service door to access the filters located in both
supply and exhaust air streams. Note to remove and install
filters, it may be easier to first remove the core(s).
See CORE.
The filters are designed to stop large particles from entering
in the core. The filters are fastened in place by a metal
spring rod. To remove filters from core(s) simply pull the
rod from one end, outward until free from core lip, and
remove.
Only use warm water with a mild detergent to wash the
filters. Do not use harsh chemicals.
The time between filter service will depend on the
application the ERV has been installed in. It can be as often
as one - two months or at the very least, cleaned every six
months.
Condensate Drains
The condensate drains consist of two drain pans which may
collect water after the ERV initiates a defrost cycle, and a
drain line to remove the condensate.
Maintenance on this portion of the system should be done
as often as possible and should not exceed six months. Note
bacterial growth in standing water is a major concern to
healthy indoor air quality, and should be avoided whenever
possible.
To clean these components, open the front service door and
flush the pans with water. Ensure that the pans drain
completely and in a reasonable amount of time. Note if the
water does not drain right away, check for blockage in the
drain line, also check that the drain line has a good slope to
it. (1/8 - 1/4” per foot)
The drain line itself should have a “P” trap in it below the
ERV which is to be filled with water to prevent odors or
gases from entering back into the unit.
Duct Work
It is a good idea to inspect ducting, outside weather hoods
(wall caps), and grilles for blockage and dirt buildup, at
least every six months.
Outside weatherhoods should be protected by a bird screen
which can plug up with debris. Also, it is a good idea to
visually confirm that the fresh air supply is free from any
sources of contamination, such as other vented combustion
equipment added after the fact.
Damper Motor
The damper motor, (if applicable) is a self contained motor
and does not require service. The damper door attached to
the motor could use a little lithium grease on the shaft
opposite the motor, where it enters its holder, once every
two - three years.
General Maintenance
As a final step in a routine maintenance schedule, it is a
good idea to confirm operation of the system, checking
speed control functions and remote control operation, if
applicable.
Wipe the inside of the cabinet to remove dust and cob webs
as needed.
It is a good idea to keep a service/maintenance log of the
unit.
Service and Maintenance
19

SYMPTOM CAUSE SO UTION
Poor Air Flows
Supply air feels cold
Dehumidistat is not Operating
Humidity Levels are too High
Condensation is appearing on
the windows
Humidity Levels are too Low
ERV and / or
Ducts Frosting up
Condensation or Ice Build Up in
Insulated Duct to the Outside
Water in the bottom of the ERV
• 1/4” (6 mm) mesh on the outside hoods is plugged
• filters plugged
• core obstructed
• building grilles closed or blocked
• dampers are closed if installed
• poor power supply at site
• ductwork is restricting ERV
• improper speed control setting
• ERV airflow improperly balanced
• poor location of supply grilles, the airflow may irritate the
occupants
• outdoor temperature extremely cold
• improper low voltage connection
• external low voltage is shortened out by a staple or nail
• check dehumidistat setting it may be on OFF
• dehumidistat is set too high
• moisture coming into the building from an unvented or
unheated crawl space
• moisture is remaining in the washroom and kitchen areas
• condensation seems to form in the spring and fall
• ERV is set at too low a speed
• dehumidistat control set too low
• blower speed of ERV is too high
• ERV air flows may be improperly balanced
• ERV air flows are improperly balanced
• malfunction of the ERV defrost system
• incomplete vapor barrier around insulated duct
• a hole or tear in outer duct covering
• drain pans plugged
• improper connection of ERV drain lines
• ERV is not level
• drain lines are obstructed
• ERV heat exchange core is not properly installed
• clean exterior hoods or vents
• remove and clean filter
• remove and clean core
• check and open grilles
• open and adjust dampers
• have electrician check supply voltage
• check duct installation
• increase the speed of the ERV
• have contractor balance ERV
• locate the grilles high on the walls or under the
baseboards, install ceiling mounted diffuser or grilles so as
not to directly spill the supply air on the occupant
(eg. over a sofa)
• turn down the ERV supply speed. A duct heater may be
necessary to temper the air
• placement of furniture or closed doors is restricting the
movement of air in the building
• if supply air is ducted into furnace return, the furnace fan
may need to run continuously to distribute ventilation air
comfortably
• check that the correct terminals have been used
• check external wiring for a short
• set the dehumidistat at the desired setting
• set dehumidistat lower
• vent crawl space and place a vapor barrier on the floor of
the crawl space
• ducts from the washroom should be sized to remove moist
air as effectively as possible, use of a bathroom fan for
short periods will remove additional moisture
• on humid days, as the seasons change, some condensation
may appear but the building air quality will remain high with
some ERV use
• increase speed of the ERV
• set dehumidistat higher
• decrease ERV blower speed
• humidity may have to be added through the use of humidifiers
• have a contractor balance ERV airflows
• Note: minimal frost build-up is expected on cores before
unit initiates defrost cycle functions
• have HVAC contractor balance the ERV
• tape and seal all joints
• tape any holes or tears made in the outer duct covering
• ensure that the vapor barrier is completely sealed
• ensure O-Ring on drain nozzle sits properly
• look for kinks in line
• check water drain connections
• make sure water drains properly from pan
Troubleshooting Your ERV System
20