CORAB HRVCRSVU1157 User manual

HRVCRSVU1157
Installation Instructions
Heat Recovery Ventilator
A11189
HRVCRSVU1157
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury or property
damage. Consult a qualified installer, service agency or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory- authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings and cautions
included in literature and attached to the unit. Consult local
building codes and the current edition of the National Electrical
Code (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical
Code CSA C22.1.
Recognize safety information. When you see this symbol on
the unit and in instructions or manuals, be alert to the potential for
personal injury. Understand the signal words DANGER,
WARNING,andCAUTION. These words are used with the
safety- alert symbol. DANGER identifies the most serious hazards,
which will result in severe personal injury or death. WARNING
signifies hazards, which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may result
in minor personal injury or product and property damage. NOTE
is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
INTRODUCTION
The Heat Recovery Ventilator (HRV) is used to exchange indoor
stale air with outside fresh air. The HRV unit is equipped with a
special heat recovery core which transfers sensible heat between
the fresh incoming air and stale exhaust air.
It is required to locate the HRV in a conditioned space. Special
attention should be given to condensate drain, duct application,
balancing the HRV, and locating unit for easy access and routine
maintenance. The cross- flow design core allows entering and
leaving air streams to transfer heat energy without mixing.
LOCATION
Inspect Equipment
Move carton to final installation location. Remove the HRV from
carton taking care not to damage unit. Remove all packaging and
inspect unit for damage. Remove parts bag from inside unit. File
claim with shipping company if shipment is damaged or
incomplete.

2
PERSONAL INJURY, ELECTRIC SHOCK OR
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal injury
or death and property damage.
1. Use this unit only in the manner intended by the manu-
facturer. If you have questions, contact the manufacturer
at the address or telephone number listed in the warranty.
2. We recommend that your unit be inspected by a special-
ized technician once a year.
3. Before servicing or cleaning the unit, disconnect power
cord from electrical outlet.
4. This unit is not designed to provide combustion and/or
dilution air for fuel- burning appliances.
5. When cutting or drilling into wall or ceiling, do not dam-
age electrical wiring and other hidden utilities.
6. Do not use the units with any solid- state speed control
device other than the corresponding ones listed in Table
1.
7. This unit must be grounded. The power supply cord has a
3- prong grounding plug for your personal safety. It must
be plugged into a mating 3- prong grounding receptacle,
grounded in accordance with the national electrical code
and local codes and ordinances. Do not remove the
ground prong. Do not use an extension cord.
8. Do not install in a cooking area or connect directly to any
appliances.
9. Do not use to exhaust hazardous or explosive materials
and vapors.
10. When performing installation, servicing or cleaning these
units, it is recommended to wear safety glasses and
gloves.
11. Due to the weight of the unit, two installers are recom-
mended to perform installation.
12. When applicable local regulations comprise more restrict-
ive installation and/or certification requirements, the
aforementioned requirements prevail on those of this doc-
ument and the installer agrees to conform to these at his
own expenses.
!WARNING
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
1. To avoid premature clogged filters, turn OFF the unit
during construction or renovation.
2. Please read specification label on product for further in-
formation and requirements.
3. Be sure to duct air outside – Do not intake/exhaust air
into spaces within walls or ceiling or into attics, crawl
spaces, or garage.
4. Intended for residential installation only in accordance
with the requirements of NFPA 90B (for a unit installed
in USA) or Part 9 of the National Building Code of
Canada (for a unit installed in Canada).
5. Do not run any air ducts directly above or closer than
2- ft (0.61 m) to any furnace or its supply plenum, boiler,
or other heat producing appliance. If a duct has to be con-
nected to the furnace return plenum, it must be connected
not closer than 9- ft 10- in (3 m) from this plenum con-
nection to the furnace.
6. The ductwork is intended to be installed in compliance
with all applicable codes.
7. When leaving the house for a long period of time (more
than two weeks), a responsible person should regularly
check if the unit operates adequately.
8. If the ductwork passes through an unconditioned space
(e.g.: attic), the ducts must be insulated, and the unit must
operate continuously except when performing mainten-
ance and/or repair. Also, the ambient temperature of the
house should never drop below 18_C(65_F).
CAUTION
!
Table 1 – Solid State Speed Control Device
UNIT CONTROL
HRVCRSVU1157 One Touch main wall control
Standard main wall control
Basic main wall control
20 minute timer

3
TECHNICAL DATA
Air Distribution
Stale Air
to outside
Fresh air
from outside
Stale air
from building
Fresh air
to building
A11190
Fig. 1 - Normal Operation
Stale air
from building Filtered air
to building
A11191
Fig. 2 - Defrost or Recirculation
Defrost Cycles
HRVCRSVU1157
Outside Temperature Defrost Cycles (Minutes) Extended Defrost Cycles ( Minutes)
_F_CDefrosting Operation Between
Each Defrost Cycle Defrosting Operation Between Each Defrost Cycle
23 -5 725 923
14 -10 725 923
-17 -27 10 22 10 22
In a cold region (outside temperature - 17_F[- 27_C] and lower), it may be necessary to setup EXTENDED DEFROST. See page 10.
24 9/16”
(624 mm)
22 ½”
(572 mm)
14 1/16”
(358 mm)
14 15/16”
(380 mm)
18 ¼”
(464 mm)
2 ¹/16”
(53 mm)
23 9/16”
(599 mm)
3 13/16”
(97 mm)
7 7/16”
(189 mm)
NOTE: Every port fits 6” round duct.
A11192
Fig. 3 - Dimensions HRVCRSVU1157

4
TYPICAL INSTALLATIONS
Use the following illustrations as guidelines to help you decide on
how the unit will be installed. All the units should be hung from
the joists.
If required, bathroom fans and a range hood may be used to
exhaust stale air. Also, for homes with more than one level, we
recommend one exhaust register at the highest level.
There are 3 installation methods: Fully ducted, Central Draw Point
and Simplified Installation.
NOTE: An electrical outlet has to be available within 3- ft of the
unit.
Fully Ducted System (Primarily for homes with
radiant hot water or electric baseboard heat.)
Stale air coming from the registers located at the highest level of
the house is exhausted to the outside. Fresh air from outside is
filtered and supplied by the register located in the lowest liveable
level.
Homes with more than one level require at least one exhaust
register at the highest level.
See Fig. 4.
A11193
Fig. 4 - Fully ducted system
Central Draw Point (Connection to a forced air
system.)
Stale air coming from the registers located at the highest level of
the house is exhausted to the outside. Fresh air from outside is
filtered and supplied to the return (plenum) or the supply duct of
the forced air unit. See Fig. 5.
For this type of installation, it is not essential that the forced air
system blower runs when the unit is in operation, but it is
recommended.
NOTE: Home with multiple forced air systems should have one
unit on each system.
A11194
Fig. 5 - Central Draw Point
Simplified Installation (Connection to a forced air
system.)
Stale air is exhausted to the outside. Fresh air from outside is
filtered and supplied to the return (plenum) or the supply duct of
the forced air unit. See Fig. 6.
To avoid cross- contamination and achieve the highest efficiencies,
the forced air system blower must always be ON.
NOTE: Homes with multiple forced air systems should have one
unit on each system.
A11195
Fig. 6 - Simplified Installation
INSTALLATION
Inspect the contents of the box
Inspect the exterior of the unit for shipping damage. Ensure that
there is no damage to the door, ports, power cord, etc.
Unit Door
HRVCRSVU1157 has one door. The unit door can be relocated on
the back of the unit. This can be helpful to optimize duct
configuration while keeping access for unit maintenance. To
change door location, follow these steps (see Fig. 7):
A. Remove both door lower mechanical screws no. 8- 32 x 1- in
(1) and set aside.
B. Open (2) and lift out the door (3).
To remove unit back panel, repeat steps A and B, but instead of
removing 2 mechanical screws, there are 4 metal screws to be
removed. Hang the door to the back of the unit and secure it by
tightening its both lower mechanical screws. Hang back panel to
the front of the unit and secure it by tightening its four metal
screws.
AB
3
2
1
A11196
Fig. 7 - Hanging the door

5
Locating the unit
Choose an appropriate location for the unit.
SWithin an area of the house where the ambient temperature is
between 50_F(10_C) and 122_F(50_C) (basement, furnace
room, closet, etc.).
SAway from living areas (dining room, living room, bedroom), if
possible.
SSo as to provide easy access to the interior of the unit, for
maintenance.
SClose to an exterior wall, so as to limit the length of the insulated
flexible duct to and from the unit.
SAway from hot chimneys and other fire hazards.
SAllow for a power source (standard 3- prong grounding outlet).
SClose to a drain. If no drain is close by, use a pail to collect
run- off.
Hang the unit with the four chains and springs provided. See Fig.
8.
A11197
Fig. 8 - Chain spring installation
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Make sure the unit is level.
CAUTION
!
Planning of the ductwork
SKeep it simple. Plan for a minimum of bends and joints.
SKeep the length of insulated ducts to a minimum.
SDo not ventilate crawl spaces or cold rooms. Do not attempt to
recover the exhaust air from a dryer or a range hood. This would
cause clogging of the filters and recovery module.
SIf the house has two floors or more, be sure to plan for at least
one exhaust register on the highest lived- in level.
Calculating duct size
Use Table 2 to ensure that the ducts you intend to install will be
carrying air flows at or under the recommended values. Avoid
installing ducts that will have to carry air flows near the maximum
values and never install a duct if its air flow exceeds the maximum
value.
NOTE: Examples below use imperial units. The same calculation
applies to metric units.
A. Example of calculation:
Problem: The installation requires two exhaust registers (one
for the kitchen, and the other for the bathroom). The registers
are connected to a main duct which will connect to the unit
(high speed performance value of 140 cfm). What size of duct
should be used for the main exhaust duct and for both end
branches leading to the registers? (See Fig. 9.)
Solution: Simplified method. (For a more detailed method of
calculating duct size, refer to the ASHRAE or HRAI HAND-
BOOK.)
Main duct: Table indicates for a 6- in duct: recommended air
flow: 120 cfm, maximum air flow: 180 cfm. The 140 cfm high
speed air flow is close enough to the recommended value (120)
and far away enough from the maximum value (180). There-
fore, a 6- in duct or larger is an appropriate choice for the
main exhaust duct.
End branches: Each end branch will have to transport a 70 cfm
air flow (140 divided by 2). Table 2 indicates for a 5- in 
duct: recommended air flow: 75 cfm; maximum air flow: 110
cfm. The high speed air flow of 70 cfm is close enough to the
recommended value (75) and far away enough from the max-
imum value (110). Therefore, a 5- in duct or larger is an ap-
propriate choice for both end branches.
NOTE:A4-induct would have been too small because the
maximum acceptable value for a 4- in duct is 60 cfm.
End
branches
5-in ∅,
70 cfm
Main branch
6-in ∅, 140 cfm
A11199
Fig. 9 - Main exhaust leading to registers
B. Fig. 10 is an example of a design for a fully ducted system
with a unit having a high speed performance of 140 cfm.
Table 2 – Ductwork Sizing Table
DUCT DIAMETER RECOMMENDED AIR FLOW MAXIMUM AIR FLOW
4 inch (102 mm) round 40 CFM (19 L/S or 68 M3/H) 60 CFM (28 L/S or 102 M3/H)
5 inch (127 mm) round 75 CFM (35 L/S or 127 M3/H) 110 CFM (52 L/S or 187 M3/H)
6 inch (152 mm) round 120 CFM (57 L/S or 204 M3/H) 180 CFM (85 L/S or 306 M3/H)

6
4-in 4-in 4-in 4-in
4-in
5-in
5-in
4-in 4-in
5-in
5-in
6-in
5-in ∅,
93 cfm
4-in ∅,
47 cfm
6-in ∅,
160 cfm
5-in ∅,
86 cfm
5-in ∅,
67 cfm
5-in ∅,
62 cfm
4-in ∅,
24 cfm
4-in ∅,
46 cfm 4-in ∅,
37 cfm
5-in ∅,
74 cfm
6-in ∅,
160 cfm
A11198
Fig. 10 - Fully ducted system
Installing the ductwork and registers
Fully ducted system (see Fig. 4)
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in property damage.
Never install a stale air exhaust register in a closed room where
combustion device operates, such as a gas furnace, a gas water
heater or a fireplace.
!WARNING
Stale air exhaust ductwork
SInstall the stale air exhaust registers where the contaminants are
produced: kitchen, living room, etc. Position the registers as far
from the stairway as possible and in such a way that the air
circulates in all the lived- in spaces in the house.
SIf a register is installed in the kitchen, it must be located at least 4
feet (1.2 m) from the range.
SInstall the registers 6 to 12 inches (152 to 305 mm) from the
ceiling on an interior wall OR install them in the ceiling.
SIf possible, measure the velocity of the air flowing through the
registers. If the velocity is higher than 400- ft/min (122 m/min),
then the register type is too small. Replace with a larger one.
Fresh air distribution ductwork
SInstall the fresh air distribution registers in bedrooms, dining
rooms, living room and basement.
SKeep in mind that the fresh air registers must be located as far as
possible from the stale air registers.
SInstall the registers either in the ceiling or high on the walls with
air flow directed towards the ceiling. (The cooler air will then
cross the upper part of the room and mix with room air, before
descending to occupant’s level.)
SIf a register must be floor installed, direct the airflow up the wall.
Central Draw Point System (see Fig. 5)
Stale air exhaust ductwork
Same as for Fully Ducted System described above.
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in property damage.
When performing duct connections, always use approved tools
and materials. Respect all corresponding laws and safety
regulations. Please refer to your local building code.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When performing duct connections to the furnace supply duct,
this duct must be sized to support the additional airflow
produced by the unit. Also, the use of metal duct is highly
recommended.
CAUTION
!
Fresh air distribution ductwork
There are 2 methods for connecting the unit to the furnace/air
handler:
Method 1: Supply side connection
SCut an opening into the furnace supply duct at least 18- in (0.5
m) from the furnace/air handler.
SConnect this opening to the Fresh air distribution port of the
unit (use metal duct,seeFig.11).

7
Metal duct
Minimum 18-in
(0.5m)
A11200
Fig. 11 - Main supply leading to registers
SMake sure the unit duct forms an elbow inside the furnace/air
handler ductwork.
SIf desired, interlock (synchronize) the furnace/air handler blower
operation (see page 11, ELECTRICAL CONNECTION TO
FURNACE).
Method 2: Return side connection
SCut an opening into the furnace return duct not less than 10- ft
(3.1 m) from the furnace/air handler (A+B).
SConnect this opening to the Fresh air distribution port of the
unit (see Fig. 12).
NOTE: For Method 2, it is not essential that the furnace/air
handler runs when the unit is operation, but we recommend it. If
desired, interlock (synchronize) the furnace/air handler blower
operation (see page 11, ELECTRICAL CONNECTION TO
FURNACE).
B
A
A+B=Not less
than 10-ft (3.1m)
A11201
Fig. 12 - Return side connection
Simplified installation
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in property damage.
When performing duct connections, always use approved tools
and materials. Respect all corresponding laws and safety
regulations. Please refer to your local building code.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When performing duct connections to the furnace supply duct,
this duct must be sized to support the additional airflow
produced by the unit. Also, the use of metal duct is highly
recommended. For a Return- Return installation, the furnace
blower must be in operation when the unit is in operation.
CAUTION
!
There are 2 methods for connecting the unit to the furnace/air
handler.
Stale air intake
SCut an opening into the furnace/air handler return duct not less
than 10- ft (3.1 m) from the furnace/air handler (see Fig. 13)
SConnect this opening to the Exhaust air from building port of
the unit.
A
B
Metal duct
Minimum 18-in
(0.5 m)
A+B = Not less
than 10-ft (3.1 m)
A11202
Fig. 13 - Method 1: Supply- return connection
Fresh air distribution
SSame instructions as for Method 1 or Method 2.
For Method 2 (Return- return), make sure there is a distance of at
least 3- ft (0.9 m) between the 2 connections to the furnace/air
handler. See Fig. 14.
B
A
A+B = Not less
than 10-ft (3.1 m)
Minimum 3-ft
(0.9 m)
A11203
Fig. 14 - Method 2: Return- return connection
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
If using Method 2, make sure the furnace/air handler blower
operation is synchronized with the unit operation. See page
11, ELECTRICAL CONNECTION TO THE FURNACE.
CAUTION
!

8
NOTE: For Method 1, it is not essential to synchronize the
furnace blower operation with the unit operation, but it is
recommended.
Connecting the ducts to the unit
Insulated flexible ducts
Use the following procedure to connect the insulated flexible ducts
to the ports of the unit (Exhaust air to outside and Fresh air from
outside ports).
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
If ducts have to go through an unconditioned space (e.g.:
attic), always use insulated ducts.
CAUTION
!
1. Pull back the insulation to expose the flexible duct.
2. Attach the flexible duct to the port using tie wrap.
3. Pull the insulation over the joint and tuck in between the
inner and outer rings of the double collar.
4. Pull down the vapor barrier (shaded part in Fig. 15) over the
outer ring to cover it completely. Fasten in place the vapor
barrier using the port strap (included in unit parts bag). To
do so, insert one collar pin through vapor barrier and first
strap hole, then insert the other collar pin through vapor bar-
rier and center strap hole and close the loop by inserting the
first collar pin in the last strap hole.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Make sure the vapor barrier on the insulated ducts does not
tear during installation to avoid condensation within the ducts.
CAUTION
!
Non- insulated rigid ducts
Use metal screws and duct tape to connect the rigid ducts to the
unit ports.
Non- insulated flexible ducts
Use tie wraps to connect the flexible ducts to the unit ports.
12
34
Collar pin
Collar pin
A11204
Fig. 15 - Ductwork installation
Non-insulated rigid ducts Non-insulated flexible ducts
A11205
Fig. 16 - Ductwork installation

9
INSTALLING TWO EXTERIOR HOODS
Choose an appropriate location to install the exterior hoods:
SThere must be a minimum distance of 6- ft (1.8 m) between the
hoods to avoid cross- contamination
SThere must be a minimum distance of 18- in (457 mm) from the
ground
Make sure the intake hood is at least 6 feet (1.8 m) away from the
following:
SDryer exhaust, high efficiency furnace vent, central vacuum vent
SGas meter exhaust, gas barbecue grill
SAny exhaust from a combustion source
SGarbage bin and any other sources of contamination
Refer to figure beside for connecting insulated ducts to the exterior
hoods. An “Anti- gust intake hood’’ should be installed in regions
where a lot of snow is expected to fall.
Exhaust hood
Intake hood
Optional
duct location
Tape and duct tie
18-in
(457 mm) 6-ft
(1.8 m)
6-ft
(1.8 m)
18-in
(457 mm)
A11206
Fig. 17 - Exterior hoods
Connecting the drain
Cut 2 sections of the plastic tube, at least 16- in (406 mm) long,
and attach them to each inner drain fitting, located under the unit.
Join both short sections to the “T” junction and main tube as
shown in Fig. 18.
16"
(406 mm)
16"
(406 mm)
A11208
Fig. 18 - Drain connection
Make a water trap loop in the tube to prevent the unit from drawing
unpleasant odors from the drain source. Make sure this loop is
located OVER the “T” as shown. Run the tube to the floor drain or
to an alternative drain pipe or pail.
IMPORTANT: If using a pail to collect water, locate the tube end
approximately 1- in (25 mm) from the top of the pail in order to
prevent water from being drawn back up into the unit.
± 1”
A11209
Fig. 19 - Drain connection
CONTROLS
This unit is equipped with an integrated control located under the
unit, on the recessed side of electrical compartment. Plug the unit.
Unit booting sequence
The unit booting sequence is similar to a personal computer boot
sequence. Each time the unit is plugged in after being unplugged,
or after a power failure, the unit will perform a 30- second booting
sequence before starting to operate.
During the booting sequence, the integrated control LED will light
GREEN (unit set in normal defrost) or AMBER (unit set in
extended defrost) for 5 seconds, and then will shut off for 2
seconds. After that, the LED will light RED for the rest of the
booting sequence. During this RED light phase, the unit is
checking and resetting the motorized damper position. Once the
motorized damper position completely set, the RED light turns off
and the booting sequence is done.
NOTE: No command will be taken until the unit is fully booted.
Integrated control
Use the push button (1) to control the unit. The LED (2) will then
show on which mode the unit is in. See Fig. 20.
Bottom of the unit
1
2
A11210
Fig. 20 - Integrated control

10
Refer to Table 3 to see how to operate the unit using its integrated
control.
Table 3 – Integrated control
PRESS ON PUSH
BUTTON LED COLOR RESULTS
Once Amber Unit is on low speed
Twice Green Unit is on high
speed
Three Times No Light Unit is Off
If a problem occurs during the unit operation, its integrated control
LED (2) will blink. The color of the blinking light depends on the
type of error detected. Refer to Troubleshooting on page 15 for
further details.
Setting extended defrost
These units are factory set to normal defrost. In cold region
(outside temperature -17_F[-27_C] and lower), it may be
necessary to setup extended defrost. During the first 2 seconds of
booting sequence, while the integrated control LED is GREEN,
press on push button for 3 seconds to set the unit in extended
defrost; the LED will blink AMBER to show the unit is in
extended defrost mode. After that, the LED will shut off, then light
RED (the unit returns in its booting sequence).
Electrical connection to main controls
For more convenience, this unit can also be controlled using an
optional main wall control.
NOTES:
1. IMPORTANT: The integrated control must be turned
OFF to use an optional main control.
2. If an optional auxiliary control is used, if activated, this aux-
iliary control will override the optional main control.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
Always disconnect the unit before making any connections.
Failure in disconnecting power could result in electrical shock
or damage of the wall control or electronic module inside the
unit.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Never install more than one optional main wall control per
unit. Make sure that the wires do not short- circuit between
themselves or by touching any other components on the wall
control. Avoid poor wiring connections. To reduce electrical
interference (noise) potential, do not run wall control wiring
next to control contactors or near light dimming circuits,
electrical motors, dwelling/building power or lighting wiring,
or power distribution panel.
CAUTION
!
Use the terminal connector included in the installation kit to
perform the electrical connection for main and optional wall
controls. Check if all wires are correctly inserted in their
corresponding holes in the terminal block. (A wire is correctly
inserted when its orange receptacle is lower than another one
without wire. See Fig. 21, wire A is correctly inserted, but wire B is
not.)
AB
12
A11211
Fig. 21 - Terminal connector
NO C NC I OC OL Y R G B
BG
OC
GB
Y
Main wall control
One Touch - Rear view
A11212
Fig. 22 - Electrical connection to One touch
NO C NC I OC OL Y R G B
A11213
Fig. 23 - Electrical connection to stamdard or basic
main wall control

11
NO C NC I OC OL Y R G B
20-MINUTE
PUSH-BUTTON SWITCHES
(5 MAXIMUM)
A11214
Fig. 24 - Electrical connection to 20- minute lighted push button timer(s)
NOTE: If an optional auxiliary control is activated and then, the
Dehumidistat (or Humidity Control) is being activated, the
Dehumidistat (or Humidity Control) will override the auxiliary
control commands.
Once the control(s) connections have been made, insert the
terminal connector on the recessed side of electrical compartment.
See Fig. 25.
Bottom of the unit
Terminal
connector
A11219
Fig. 25 - Terminal connector
NOTE: For information about the operation of the wall controls,
refer to the user guide.
ELECTRICAL CONNECTION TO THE
FURNACE
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
Never connect a 120- volt AC circuit to the terminals of the
furnace interlock (standard wiring). Only use the low voltage
class 2 circuit of the furnace blower control
!WARNING
For a furnace connected to a cooling system:
On some older thermostats, energizing the “R” and “G” terminals
at the furnace has the effect of energizing “Y” at the thermostat and
thereby turning on the cooling system. If you identify this type of
thermostat, you must use the ALTERNATE FURNACE
INTERLOCK WIRING. See Fig. 26.
W R G Y
W
R
G
C
Y
UNIT TERMINAL CONNECTOR
THERMOSTAT
TERMINALS
FOUR
WIRES
TWO WIRES
heating only
FURNACE
24-VOLT
TERMINAL BLOCK TWO WIRES COOLING SYSTEM
NO C NC I OC OL Y R G B
WRGY
W
R
Y
R
G
Y
C
THERMOSTAT
TERMINAL
4 WIRES
2 WIRES
heating only wiring
nuts
FURNACE
24-VOLT
TERMINAL BLOCK 2 WIRES COOLING SYSTEM
NO
NC
C
UNIT TERMINAL CONNECTOR
NO C NC I OC OL Y R G B
Standard furnace interlock wiring Alternate furnace interlock wiring
A11215
Fig. 26 - Electrical connection to furnace

12
Field wiring
remote control
(see notes 3 & 4)
120 V, 60 Hz
W1
J5 J7 J6 J4
ELECTRONIC
ASSEMBLY
1 2 3 1 2 1 2 1 2 3
1234
12
12345
12345
J8
J9
J11
J10
12
J12
J13
J14
10
9 8 7 6 5 4 3 2 1
B
24 V class 2
9.5 V class 2
120V, 60Hz
Neutral
120 V, 60Hz
Line
CPU
K2 K4 K5
J5-2
J10-1J10-2
Line voltage factory wiring Class 2 low voltage factory wiring Class 2 low voltage field wiring
See note 1
120 V
100 V
68 V
neutral
Exhaust fan
motor
1234512
12
J3
J2 J1
t˚
Damper motor
B
Override switch
Furnace blower interlock
J14-1: NO J14-2: COM J14-3: nc
(optional; see notes 3 & 5)
DAMPER ELECTRONIC ASSEMBLY
Defrost temperature sensor
WIRING DIAGRAM LOGIC DIAGRAM
Exhaust fan motor
Supply fan motor
J5-1 J5-3 J7-2 J7-1 J4-1 J4-3 J6-2 J6-1
K1 K3
K2
24 V class 2
9.5 V class 2
120 V
100 V
68 V
neutral
J9-1
J9-2
J9-3
J4-2
J9-4
Exhaust fan motor
capacitor
Supply fan motor
capacitor
J8-1 J8-2 J8-4 J8-5
K4
J12-2 J12-1
A1
Damper motor
J3-2 J3-1
J2-2 J2-1
F1
J12-5 J12-4 J12-3 J2-3
J2-4 J2-5
J11-2 J11-1
K1 K3
K5 J14-3
J14-1 J14-2
Furnace blower interlock
(optional; see notes 3, 5)
J14-4 J14-5 J14-6 J14-7 J14-8 J14-9
J14-10
Override switch (optional; see notes 3, 4) Field wiring remote control (see
notes 3, 4)
ICP
B
YRG
B
W
BL
R
G
BBL BN
BN
B B B B BBL
Exhaust fan
motor
capacitor
Supply fan
motor
capacitor
Supply fan
motor
G
G
BN
BN
Y
Y
BW
A2
A2
M3
T1
R1
A1
F1
M1
C1 C2
M2
(optional; see
notes 3 & 4)
Critical characteristic.
JU1
123
MED HI
321
HI MED
JU1
FAN MOTORS SPEED SELECTION
NOTES
1. Use specified UL listed/CSA Certified line fuse.
2. If any of the original wire, as supplied, must
be replaced, use the same equivalent wire.
3. Field wiring must comply with applicable
codes, ordinances and regulations.
4. Remote controls (class 2 circuit) available, see instruction manual.
5. Furnace fan circuit must be class 2 circuit only.
Ref
2
Ref
1
Ref
1
MED-HI R LO
Ref
2
62 V
nc
nc
83 V
OP
62 V
R
MED-LO BL
83 V
MED
P O
O
B HI
CAUTION:You can change REF 1 or REF 2, but not both at the
same time. If you do change REF 1 and REF 2 you will inverse fan motor speeds.
REF 1 ORG REF 1 RED REF2 FAN SPEEDS CFM MAX Factory shipped ORG to ORG RED to RED HI (120V) & LO (62V) 160 ORG to ORG RED to RED MED-HI (100V) & LO (62V) 140
JU1
123
JU1
123
COLOR CODE
B BLACK BL BLUE BN BROWN G GREEN O ORANGE P PURPLE R RED W WHITE Y YELLOW nc no connection
A11216
Fig. 27 - HRVCRSVU1157 wiring diagram

13
BALANCING THE UNIT
What you need to balance the unit
SA magnehelic gauge capable of measuring 0 to 1 inch of water
(0 to 249 Pa) and 2 plastic tubes.
SThe balancing chart of the unit.
A11217
Fig. 28 - Magnehelic gauge
Preliminary stages to balance the unit
SSeal all the unit ductwork with tape. Close all windows and
doors.
STurn off all exhaust devices such as range hood, dryer and
bathroom fans.
SMake sure the balancing dampers are fully open by setting both
damper balancing tools completely vertical.
SMake sure all filters are clean (if it is not the first time the unit is
balanced).
A11218
Fig. 29 - Damper balancing tool
Balancing procedure
1. Set the unit to high speed.
NOTE: Make sure that the furnace/air handler blower is
ON if the installation is in any way connected to the duct-
work of the cold air return. If not, leave furnace/air handler
blower OFF. If the outside temperature is below 0_C/32_F,
make sure the unit is not running in defrost while balancing.
(By waiting 10 minutes after plugging the unit in, you are
assured that the unit is not in a defrost cycle.)
2. Place the magnehelic gauge on a level surface and adjust it
to zero.
3. Connect tubing from gauge to EXHAUST air flow pressure
taps (the ones with arrows, see insets in illustration beside).
Be sure to connect the tubes to their appropriate high/low
fittings. If the gauge drops below zero, reverse the tubing
connections.
4. Note the CFM value from balancing chart located on unit.
5. Repeat steps 3 and 4, but to FRESH air flow pressure taps.
6. Match highest CFM value to lowest by adjusting the balan-
cing damper corresponding to the highest value.
Stale air flow
Fresh air flow
A11220
Fig. 30 - Balancing procedure
7. Secure both dampers in place with a fastening screw (in-
cluded).
8. Write the required air flow information on a label and stick
it near the unit for future reference (date, maximum speed
air flows, your name, phone number and business address).
NOTES:
1. Use conversion chart provided with the unit to convert mag-
nehelic gauge readings to equivalent cfm values.
2. The unit is considered balanced even if there is a difference
of 10 cfm (or 5 l/s or 17 m3/h) between the two air
flows.

14
SERVICE PARTS
1
2
3
4
5
6
7
8
9
10
11
12
13
8
A11223
Fig. 31 - Parts
ITEM DESCRIPTION QTY HRVCRSVU1157
1Oval Port 218206
2Double Collar Oval Port 218207
3Exhaust Damper Spring 118221
4Motor Assembly 218197
5Balancing Tool 218220
6Defrost Damper 118200
7Damper System Assembly (including Item 6) 118199
8Core Filter 218204
9Heat Recovery Core 118203
10 Door Assembly 1SV64922
11 PCB 119342
12 Transformer 118219
13 Capacitor 5 F 216042
14 ThermistorKit(notshown) 115749
15 Hardware Kit (not shown) 108304
16 PCB Connector (not shown) 116416

15
If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the table below to know where the
problem occurs on the unit.
ERROR TYPE ACTION UNIT STATUS
LED flashes GREEN Thermistor error Replace thermistor Unit works but will defrost frequently
LED flashes AMBER Damper error Go to point 6 Unit does not work
LED flashes RED Motor error Go to point 9 Unit does not work
Problems Possible causes You should try this
1Unit does not work. The circuit board may be defective. Unplug the unit. Disconnect the main control and the op-
tional(s) controls(s) (if need be). Jump Gand Bterminals.
Plug the unit back and wait about 10 seconds. If the motors
run on high speed and the damper opens, the circuit board
is not defective.
Thefusemaybedefective. Check if fuse F1 is blown. In that case, replace fuse F1 as
per product nameplate.
2Thedamperactuatordoesnot
work.
Thedamperactuatorortheintegrated
damper mechanism may be defective.
Unplug the unit. Disconnect the main control and the op-
tional controls(s) (if need be). Wait 10 seconds and plug
the unit back. Check if the damper opens. If not, use a
multimeterandcheckfor24VAConJ12- 1andJ12- 2(in
electrical compartment). If there is 24 VAC, replace the en-
tire damper assembly.
NOTE: It is normal to experience a small delay (7- 8
seconds) before detecting the 24 V AC signal at start- up.
This signal will stay during 17- 18 seconds before disap-
pearing.
The circuit board or the transformer
may be defective.
If there is no 24 V AC, check for 24V AC between J8- 1 and
J8- 2. If there is 24V AC, replace the circuit board, and if
there is no 24V AC, change the transformer.
3The wall control does not work. The wires may be in reverse position. Ensure that the color coded wires have been connected to
their appropriate places.
Thewiresmaybebroken. Inspect every wire and replace any that are damaged.
ThewireinthewallORthewallcon-
trol may be defective.
Remove the wall control and test it right beside the unit
using another shorter wire. If the wall control works there,
change the wire. If it does not, change the wall control.
4The Dehumidistat (or Humidity
control) does not work OR the
20- minute push button timer
does not work OR its indicator
light does not stay on.
The wires may be in reverse position. Ensure that the color coded wires have been connected to
their appropriate places.
The Dehumidistat (or Humidity con-
trol) or push button may be defective.
Jump the OL and OC terminals. If the unit switch to high
speed, remove the Dehumidistat or push button and test it
right beside the unit using another shorter wire. If it works
here, change the wire. If it doesn’t, change the Dehumidis-
tat or the push button.
5The supply and/or exhaust motor
do not work.
Thefusemaybedefective. Check if fuse F1 is blown. In that case, replace fuse F1 as
per product nameplate.
ThejumperJU1maybeinwrongpo-
sition or missing.
Make sure that jumper is properly located as per wiring
diagram on page 12.
Jumper J11 may be missing. Make sure there is a jumper on connector J11.
The circuit board or transformer may
be detective.
NOTE: Refer to the FAN MOTOR SPEED SELECTION table
of the wiring diagram on page 12 to know what the voltage
reading must be. Press on the integrated control push but-
ton until the unit turn on low speed (the LED will light AM-
BER). Using a multimeter, check the voltage on J4- 1 and
J4- 2 (for supply motor), and on J5- 1 and J5- 2 (for ex-
haust motor). Then set the unit on high speed by pressing
on the integrated control push button one more time (the
LED will light GREEN). Using a multimeter, check the
voltage on J4- 1 and J4- 2 (for supply motor), and on
J5- 1 and J5- 2 (for exhaust motor). If all the readings cor-
respond to the right voltage values, the circuit board is not
defective. If one or both readings are different, change the
transformer. If no voltage is present, change the circuit
board.
The motor(s) or capacitor(s) may be
defective
Using a multimeter, check the ohms value on each motor
connectors. For BLUE and BLACK motor wires, the right
value is 49 ohms. For BLUE and BROWN motor wires, the
right value is 79 ohms. For BROWN and BLACK motor
wires,therightvalueis126 ohms. If the ohms values are
the same, the motor is not defective. Replace the motor
capacitor.
6The defrost cycle does not work
(the fresh air duct is frozen) OR
the fresh air distributed is very
cold.
Ice deposits may be hindering the
damper operation.
Remove the ice.
The damper rod or the port damper
itself may be broken.
Inspect these parts and replace if necessary.
Thedamperactuatororcircuitboard
may be defective.
See point 2.
7The integrated control push but-
ton does not work.
The 30- second boot sequence is not
completed.
See Unit Booting Sequence, page 9.

16
These products earned the
ENERGY STAR
®
by meeting strict
energy efficiency guidelines set by
Natural Resources Canada and
the US EPA. They meet ENERGY
STAR requirements only when
used in Canada.
2018 CAC / BDP D7310 W. Morris St. DIndianapolis, IN 46231 Edition Date: 05/18
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: IM- HRVCRSVU- 01
Replaces: NEW