Greenheck ASSURE-120S-S1 User manual

®
Residential Energy Recovery Ventilators 1
®
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install, operate or
maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with these
instructions will result in voiding of the product warranty and may result in personal injury and/or property damage.
Models ASSURE-120S-S1, SYNC-110SE-S1,
SYNC-180SCE-S1 and SYNC-270TCE-S1
Residential Energy Recovery Ventilators
Table of Contents
Shipping and Packing List..................................................................................................................... 2
General Information............................................................................................................................... 2
Model Numbers and Descriptions......................................................................................................... 2
Model Number Nomenclature Breakdown............................................................................................ 3
Terms and Denitions............................................................................................................................ 3
Application............................................................................................................................................ 3
Required Tools and Materials................................................................................................................ 3
Specications........................................................................................................................................ 4
Optional Fan Curve Speeds.................................................................................................................. 6
Dimensional Drawings........................................................................................................................... 7
Defrost Overview................................................................................................................................... 8
Required Ventilation............................................................................................................................... 9
How the Dehumidistat Works................................................................................................................ 10
Two-Speed Switch with Intermittent Mode (435246)............................................................................. 11
Two-Speed Switch with Humidity Sensor (435245)............................................................................... 11
PrecisionSYNC Control (435244).......................................................................................................... 12
20/40/60 Minute Timer (435247)........................................................................................................... 13
20/40/60 Minute Wireless Timer (435248)............................................................................................. 13
Wireless Repeater (435249)................................................................................................................... 13
Overview of Installation Methods.......................................................................................................... 14
Connecting the Ductwork...................................................................................................................... 14
Shaping Ducting to Fit Oval Ports......................................................................................................... 14
Installation Methods - Simplied (Return/Return)................................................................................. 15
Installation Methods - Partially Dedicated............................................................................................. 16
Installation Methods - Fully Dedicated.................................................................................................. 17
Unit Installation Location and Restrictions............................................................................................ 18
Suspending the Unit.............................................................................................................................. 18
Mounting the Unit.................................................................................................................................. 19
Installing the Drain Connection (Optional)............................................................................................. 19
Installing Drain Plug (Optional).............................................................................................................. 20
ERV Dual Intake and Exhaust Hood Kit................................................................................................. 20
Terminal Blocks..................................................................................................................................... 21
Installation of Controls........................................................................................................................... 21
Installation and Operation of 20/40/60 Minute Wireless Timer (435248).............................................. 22
Installation and Pairing of Wireless Repeater (435249)......................................................................... 23
Installation of 20/40/60 Minute Timer (435247)..................................................................................... 24
Installation of Third Party Mechanical Timers....................................................................................... 24
Interlocking ERV to Air Handler/Furnace Blower................................................................................... 24
Electrical Connections........................................................................................................................... 25
Unit Dip Switch Orientation................................................................................................................... 28
Adjusting the EC Motor (SYNC-110SE-S1)........................................................................................... 29
Balancing the Airows........................................................................................................................... 29
Manual Balancing.................................................................................................................................. 29
Precision Balancing............................................................................................................................... 31
Troubleshooting..................................................................................................................................... 32
Homeowner Maintenance Information.................................................................................................. 33

Package 1 of 1 contains:
1 - Assembled ventilator
1 - Accessories Bag assembly contains the following:
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life.
Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or a service agency.
Shipping and Packing List
Model Numbers and Descriptions
General Information
Table 1. Accessories Bag Assembly Contents
UNIT NAME MODEL NUMBER CONTENTS
ASSURE120 ASSURE-120S-S1 1x Ventilation Label
4x Mounting Brackets
8x Screws
SYNC110 SYNC-110SE-S1
SYNC180 SYNC-180SCE-S1
1x Ventilation Label
4x Mounting Brackets
8x Screws
1x Terminal Block Connection
SYNC270 SYNC-270TCE-S1
1x Ventilation Label
2x Drain Spouts
2x Drain Spout Nut
1x Tee Fitting
1x Hanging Strap Kit
2x Drain Plugs
This instruction is intended as a general guide and does not supersede local codes in any way
Consult authorities who have jurisdiction before installation.
Table 2. Model Number and Descriptions
UNIT NAME MODEL NUMBER DESCRIPTION
ASSURE120 ASSURE-120S-S1
50-130 CFM compact, affordable Energy Recovery Ventilator with side ports
designed for ceiling mounting in single family or multi unit residential buildings.
Fan defrost unit with no balancing* or drains required.
SYNC110 SYNC-110SE-S1
50-130 CFM compact, high efciency Energy Recovery Ventilator with side ports
designed for ceiling mounting in single family or multi unit residential buildings.
Designed with tuneable EC motors to allow for custom airows. Fan defrost unit
with no balancing* or drains required.
SYNC180 SYNC-180SCE-S1
Cold-weather certied, compact, high efciency Energy Recovery Ventilator
with side ports designed for ceiling or wall mounting in single family or multi
unit residential buildings. Precision Balance feature ensures EC motors produce
constant user selected airow. Fan defrost unit with no drains required.
SYNC270 SYNC-270TCE-S1
Cold-weather certied, compact high efciency Energy Recovery Ventilator with
top ports designed for suspended installation using hanging straps. Precision
Balance feature ensures EC motors produce constant user selected airow.
Includes energy efcient damper motor for defrost and recirculation. Drains are
optional.**
*See “Balancing the Airows” on page 29.
**See “Installing the Drain Connection (Optional)” on page 19 and “Installing Drain Plug (Optional)” on page 20.the Drain Connection (Optional)” on page 19 and “Installing Drain Plug (Optional)” on page 20.
Residential Energy Recovery Ventilators
2
®

Example Model Number:
SYNC–180SCE – S1
Model Number Nomenclature Breakdown
ERV Family
Gross Exhaust Rated CFM @ 0.4 in. wg
Port Location (Side or Top)
Climate (Cold or Blank)
Motor Type (ECM or Blank)
Conguration (Mirror or Standard)
Revision
• ERV - Energy Recovery Ventilator.
• Defrost Mode - to ensure reliable operation during cold weather, the ERV will automatically cycle through its defrost mode as
needed.
• Dehumidistat - a control device that senses the amount of moisture in the air and activates high−speed ventilation when the air
moisture level exceeds the setpoint.
• Reset - whenever resetting of the ERV is required, simply unplug the power cord for 30 seconds. The Self-Test will occur when
the ERV is reconnected.
• Self-Test - each time the ERV is powered/energized, the self-test function will automatically initiate. During the self-test, the
ERV will cycle through all the speeds available (1 − 5), test the damper motor operation, and will default back to the previous
operational mode and speed selection. Total self-test duration is approximately 90 seconds.
• Standby Mode - the ERV is powered/energized and waiting for fan operation to be initiated. For example, the ERV is set to
Continuous Ventilation Operation Mode at speed 0.
• Thermistor - This is the temperature sensor that measures electrical resistance as outdoor temperatures uctuate.
• HVI - Home Ventilating Institute.
• HRAI - Heating Refrigeration Air Conditioning Institute.
This equipment is designed to provide fresh air while exhausting an equal amount of stale air. The ERV unit is equipped with an
enthalpic core. The ERV unit transfers both sensible (temperature) and latent (moisture) between incoming fresh air and exhausting
stale air.
Terms and Definitions
Application
Required Tools and Materials
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury.
Take care while handling this equipment and wear gloves and protective clothing.
CAUTION
Potential equipment malfunction or damage. May require repairs and/or void warranty.
Do not interconnect ERV to other appliances such as Stove Vents, Clothes Dryer Vents, Central Vacuum Systems, Auxiliary Fans, etc.
Field Provided Material
• Low voltage control wire
• Mastic tape
• 1/2˜ I.D. Drain hose
• Caulking material
• Aluminum foil duct tape
• Zip ties (duct)
• Flexible or rigid, insulated or non-insulated ducts - class II rated zip ties
Residential Energy Recovery Ventilators 3
®

Specifications
Table 3. Specifications
Specications Single−Core ERV Units
Model No. ASSURE-120S-S1 SYNC-110SE-S1 SYNC-180SCE-S1 SYNC-270TCE-S1
Unit Weight in pounds
(kilograms) 34 (15) 34 (15) 42 (19) 57 (26)
Unit Dimensions Refer to “Dimensional Drawings” on page 7.
High Speed (HVI Certied)
Inches wg (Pa) CFM (L/s) CFM (L/s) CFM (L/s) CFM (L/s)
0.1 (25) 138(65) 131(62) 199(94) 295 (139)
0.2 (50) 133 (63) 123 (58) 191 (90) 286 (135)
0.3 (75) 129(61) 117(55) 184(87) 278(131)
0.4 (100) 125(59) 108 (51) 176(83) 271(128)
0.5 (125) 119(56) 97 (46) 167 (79) 263(124)
0.6 (150) 114 (54) 87 (41) 159 (75) 254(120)
0.7 (175) 108 (51) 74 (35) 150 (71) 246(116)
0.8 (200) 102 (48) 57(27) 140 (66) 237(112)
0.9 (225) 93 (44) 40(19) 133 (63) 229(108)
1.0 (250) 85 (40) 125 (59) 218(103)
Adjusted Sensible Recovery
Efciency @ 32°F (0°C)*
@ 49 CFM (23 L/s)
78%
@ 49 CFM (23 L/s)
75%
@ 64 CFM (30 L/s)
87%
@ 64 CFM (30 L/s)
81%
Sensible Recovery
Efciency @ 32°F (0°C)*
@ 49 CFM (23 L/s)
69%
@ 49 CFM (23 L/s)
72%
@ 64 CFM (30 L/s)
84%
@ 64 CFM (30 L/s)
77%
Adjusted Sensible Recovery
Efciency @ -13 °F (−25°C)* N/A N/A @ 72 CFM (34 L/s) 63%
@ 75 CFM
(35 L/s) 59%
Sensible Recovery
Efciency @ -13°F (−25°C)* N/A N/A @ 72 CFM (34 L/s) 62%
@ 75 CFM
(35 L/s) 56%
Latent Efciency 95°F (35°C)* @ 49 CFM
(23 L/s) 44%
@ 49 CFM
(23 L/s) 45%
@ 64 CFM
(30 L/s) 52%
@ 64 CFM
(30 L/s) 39%
Total Efciency 95°F (35°C)* @ 49 CFM
(23 L/s) 45%
@ 49 CFM
(23 L/s) 51%
@ 66 CFM
(31 L/s) 60%
@ 64 CFM
(30 L/s) 49%
*Certied by the Home Ventilating Institute (HVI) according to test procedures developed by HVI members and based on
internationally recognized standards. For performance ratings at other conditions not shown, please visit the HVI website.
Number of speeds available
with Two-Speed Switch with
Humidity Sensor (435245)
and Two-Speed Switch with
Intermittent Mode (435246)
2 2 N/A N/A
Residential Energy Recovery Ventilators
4
®

Specifications
Table 3. Specifications (continued)
Specications Single-Core ERV Units
Model No. ASSURE-120S-S1 SYNC-110SE-S1 SYNC-180SCE-S1 SYNC-270TCE-S1
Number of speeds available
with PrecisionSYNC Control
(435244)
5555
Ventilator Type Energy Recovery Energy Recovery Energy Recovery Energy Recovery
Energy Recovery Core Enthalpic Enthalpic Enthalpic Enthalpic
Defrost Type Fan Fan Fan Recirculation
Balancing N/A N/A Auto-Balance Auto-Balance
Number of Ports 4444
Pre-Filters Supply & Exhaust
MERV 6 or MERV 13**
** To be ordered separately. Comes in a set of 4 and is installed in the Fresh Side only.
When a MERV 13 lter is installed for the rst time, airow will need to be balanced.
Condensate Drain
Connections:
Spouts: qty. 2 (1/2” o.d.)
Drain Tee: qty. 1 (1/2” o.d.)
No No No Yes (optional use)
Drain Plug Included No No No Yes (optional use)
Hanging Strap kit Included No No No Yes
Mounting Brackets Included Yes Yes Yes No
Electrical Characteristics: 120 Volts, 60 Hertz, 1 phase
Motor type PSC ECM ECM ECM
*Fan watts @ HVI Test 32°F
(0° C)
@ 49 CFM
(23 L/s), 60W
@ 49 CFM
(23 L/s), 22W
@ 64 CFM
(30 L/s), 28W
@ 64 CFM
(30 L/s), 30W
Fan Watt Rating 160 84 130 340
Amp Rating 1.4 1.4 24.5
* Certied by the Home Ventilating Institute (HVI) according to test procedures developed by HVI members and based on
internationally recognized standards.
For performance ratings at other conditions not shown, please visit the HVI website.
Residential Energy Recovery Ventilators 5
®

Optional Fan Curve Speeds
Table 4. Optional Fan Curves Speeds (Factory Tested)
Single-Core ERV Units
Model No. ASSURE-120S-S1 SYNC-110SE-S1 SYNC-180SCE-S1 SYNC-270TCE-S1
Speed 5 - High
IN. WG (PA) CFM L/s CFM L/s CFM L/s CFM L/s
0.1 (25) 138 65 173 81 295 139
0.2 (50) 133 63 91 43 164 77 286 135
0.3 (75) 129 61 85 40 155 73 278 131
0.4 (100) 125 59 76 36 145 68 271 128
0.5 (125) 119 56 57 27 134 63 263 124
0.6 (150) 114 54 38 18 123 58 254 120
0.7 (175) 108 51 111 52 246 116
0.8 (200) 102 48 99 47 237 112
0.9 (225) 93 44 87 41 229 108
1.0 (250) 85 40 74 35 218 103
Speed 4 - Medium High
IN. WG (PA) CFM L/s CFM L/s CFM L/s CFM L/s
0.1 (25) 117 55 147 69 255 120
0.2 (50) 112 53 85 40 136 64 245 115
0.3 (75) 108 51 80 38 125 59 232 109
0.4 (100) 103 48 63 30 114 54 225 106
0.5 (125) 97 46 42 20 102 48 215 101
0.6 (150) 92 43 89 42 202 95
0.7 (175) 87 41 76 36 192 90
0.8 (200) 80 38 63 30 177 83
0.9 (225) 72 34 49 23 165 78
1.0 (250) 34 16 155 73
Speed 3 - Medium
IN. WG (PA) CFM L/s CFM L/s CFM L/s CFM L/s
0.1 (25) 100 47 127 60 211 99
0.2 (50) 95 45 80 38 114 54 202 95
0.3 (75) 91 43 70 33 100 47 188 88
0.4 (100) 89 42 57 27 85 40 181 85
0.5 (125) 85 40 31 15 70 33 164 77
0.6 (150) 80 38 53 25 150 71
0.7 (175) 75 35 36 17 134 63
0.8 (200) 18 8115 54
Speed 2 - Medium Low
IN. WG (PA) CFM L/s CFM L/s CFM L/s CFM L/s
0.1 (25) 86 40 100 47 150 71
0.2 (50) 82 39 75 35 87 41 140 66
0.3 (75) 79 37 61 29 73 34 125 59
0.4 (100) 74 35 38 18 58 27 104 49
0.5 (125) 69 32 43 20 86 41
0.6 (150) 64 30 27 13 66 31
0.7 (175) 57 27 42 20
Speed 1 - Low
IN. WG (PA) CFM L/s CFM L/s CFM L/s CFM L/s
0.1 (25) 69 32 81 38 89 42
0.2 (50) 66 31 69 32 64 30 68 32
0.3 (75) 62 29 51 24 48 23 46 22
0.4 (100) 60 28 20 931 15 22 10
0.5 (125) 54 25 14 7
0.6 (150) 44 21
Residential Energy Recovery Ventilators
6
®

Dimensional Drawings
Figure 1. ASSURE-120S-S1 & SYNC-110SE-S1
Figure 2. SYNC-180SCE-S1
Figure 3. SYNC-270TCE-S1
Figure 4. Dual Intake and Exhaust Hoods
DOOR OPEN VIEW
20 3/4 in. (527 mm)
DOOR CLOSED VIEW SIDE VIEW
9-3/4 in. (248 mm)
19-3/8 in. (492 mm)
5 in. (125 mm)
Collars
Core
Motorized
Impellers
Filters
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
DOOR OPEN VIEW
26 in. (660 mm)
DOOR CLOSED VIEW DOOR CLOSED SIDE VIEW
10 in. (254 mm)
22 in. (559 mm)
6 in. (152 mm)
Collars
Collar-mounted
balancing ports
Core
Motorized
Impellers
Filters
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
DOOR OPEN VIEW SIDE VIEW TOP VIEW
6 in. (152 mm)
Collars
Recirculating
Defrost Damper Core
Motorized
Impeller
Motorized
Impeller Filters
33 5/8 in (854mm)
18 3/4 in. (476 mm)
15 in. (381 mm)
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
Top View
13 in (330 mm)
Side View
8.25 in (210 mm)
8.25 in (210 mm)
6in (152 mm)
5in (127 mm)
21.5 in (546 mm)
25 in (635 mm)
Residential Energy Recovery Ventilators 7
®

The ERV has an electronically controlled defrost system. The defrost cycle is activated when the outdoor temperature drops below
27°F (−3°C). Incoming fresh air temperature is constantly measured to determine if defrost is required. The three defrost settings are:
• At 27°F (−3°C) ERV runs in defrost for 3 minutes and runs in ventilation for 25 minutes
• At −4°F (−20°C) ERV runs in defrost for 4.5 minutes and runs in ventilation for 17 minutes
• At −31°F (−35°C) ERV runs in defrost for 7 minutes and runs in ventilation for 15 minutes
No remote device can override this defrost mode until the cycle is complete. After the cycle is completed, the ERV defaults to
previous settings. If the cycle is completed and the thermistor continues to measure defrost temperature the defrost cycle is
repeated.
Applicable Unit:
SYNC-270TCE-S1
During defrost a motor driven damper door mechanism closes off the supply air from outside allowing exhaust air to recirculate
through the unit’s core. During the defrost portion of the cycle no ventilation is occurring. After the defrost portion of the cycle, the
damper operates in the opposite direction to reopen the fresh air port. The defrost cycle repeats until the temperature rises above
27°F (−3°C).
Defrost Cycle
Recirculating Damper Defrost
Applicable Units: ASSURE-120S-S1, SYNC-110SE-S1, and SYNC-180SCE-S1
During defrost the supply fan shuts off while the exhaust fan continues to operate. This allows the heat from the exhaust air to
defrost the unit’s core. During the defrost portion of the cycle, the unit operates with only exhaust ventilation. After the defrost
portion of the cycle, the supply fan powers on and operates with balanced ventilation. The defrost cycle repeats until the
temperature rises above 27°F (−3°C).
Fan Defrost
Residential Energy Recovery Ventilators
8
®

Required Ventilation
ASHRAE
• ASHRAE 62.2-2019 is a national standard that provides methods for achieving acceptable indoor air quality in typical
residences. It was developed and is maintained by the American Society of Heating and Air-Conditioning Engineers (ASHRAE).
• This standard recommends Dwelling-Unit Ventilation, which is a mechanical exhaust system, supply system, or combination
thereof.
Formula Method
The Building Ventilation rate is determined based on the oor area and the number of bedrooms, as dened in Section 4.1.1 equation
4-1a.
Formula:
(Square feet x 0.03) + (bedrooms + 1) x 7.5 = 97.5
(2000 X 0.03) + (4+1) X 7.5 = 97.5
Table Method
Example: a 2000 square foot building with 4 bedrooms from Section 4.1.1 Table 4-1a, a quick reference table predicts 98 cfm. The
following table complies with ASHRAE Standard 62.2-2019, Section 4.1.1 Table 4-1a, Continuous Whole-Building Ventilation rate in
cfm.
Table 5. Whole Building Ventilation Air Requirements
Floor Area
(Square Feet)
Number of Bedrooms
12345
CFM CFM CFM CFM CFM
<500 30 38 45 53 60
501 - 1000 45 53 60 68 75
1001 - 1500 60 68 75 83 90
1501 - 2000 75 83 90 98 105
2001 - 2500 90 98 105 113 120
2501 - 3000 105 113 120 128 135
3001 - 3500 120 128 135 143 150
3501 - 4000 135 143 150 158 165
4001 - 4500 150 158 165 173 180
4501 - 5000 165 173 180 188 195
For more information about ASHRAE, go to: https://www.ashrae.org.
Residential Energy Recovery Ventilators 9
®

How the Dehumidistat Works
When using either the Two-Speed Switch with Humidity Sensor (435245) or the PrecisionSYNC Control (435244) a built-in
dehumidistat is present. The following information is provided on how it works.
High indoor humidity levels, during the heating season, have become a problem in many well insulated, tight homes. Excessive
condensation on the windows is a visual sign of high indoor humidity levels. High indoor humidity levels can result in mold, mildew
and the eventual degradation of the building structure itself. Your ERV reduces indoor humidity levels when the outdoor air is drier
than the indoor air.
These conditions usually occur during the heating season when outdoor temperatures are less than 59°F (15°C).
During the heating season, the operation of the ERV may reduce indoor humidity levels sufciently to eliminate the need for further
dehumidication. Use the adjustable dehumidistat feature located on the control if your home requires further dehumidication
during the heating season.
The humidication function aggressively addresses high indoor humidity levels by initiating high speed ventilation when the indoor
humidity levels rise above the set point on the control. Once the humidity in the house is reduced, the ERV will revert back to its
previous setting.
It is recommended to operate the ERV for the rst few days without use of the dehumidistat function to observe if a further
dehumidication effect will be required.
The dehumidistat operates in percentage of RH (relative humidity) with 60 being high and 20 being low. If after a few days, further
dehumidication is required (the building is still too humid), set the humidity level to a lower amount.
The average person is comfortable between 30% and 50% RH. The dehumidistat should be set to OFF for all seasons except the
heating season since a dehumidifying effect only occurs when the outdoor air is dryer than the indoor air.
Dehumidification Sensing
Every 6 hours the ERV will run and sample the outdoor air temperature (this includes when the unit is in Standby mode) to read
the outdoor temperature. The unit then resumes operations at the selected mode and speed (approximately 60 second duration).
Dehumidistat Disable or Dehumidistat Re-enable may be initiated.
Dehumidistat Disable automatically disables the Dehumidistat function on the main wall control when outdoor temperatures exceed
15°C (59°F) for a full 24-hour period. All other ERV features, and functions operate normally while the Dehumidistat function is
disabled.
Dehumidistat Re-enable automatically re-enables the Dehumidistat function if either the outdoor temperature drops below 15°C
(59°F) for a full 24-hour period or if the ERV is reset (unplugged for 30 seconds).
Residential Energy Recovery Ventilators
10
®

Two-Speed Switch with Intermittent Mode (435246)
Two-Speed Switch with Humidity Sensor (435245)
The control offers the following features to control your home’s ventilation.
• Two-speed fan setting (LOW / HIGH)
• Standby setting (fan OFF)
• 20min on / 40min off mode (fan defrost models)
• 20min on / 40min recirculation mode (damperdefrost models)
• Compatible with Wireless Timers. Connect to 3 wire 20 gauge low voltage wire
• Slim-line design
The control offers the following features to control your home’s ventilation.
• Two-speed fan setting (LOW / HIGH)
• Standby setting (fan OFF)
• Electronic dehumidistat
• Compatible with wireless timers. Connect to 3-wire 20 gauge low voltage wire.
• Designed to be mounted in a standard 2 x 4” (51 x 102 mm) electrical box or
surface mounted to a wall.
LO
HI
On / OFF
Button
20 / 40 Mode
Button
Fan Speed
Button
Fan Speed
Indicator
20 / 40
Mode
Indicator
Light
On / OFF
Light
20/40
Table 6. Two-Speed Switch with Intermittent Mode Settings
Settings Icon Description
Turning on the Control Press and release the ON/OFF button. The light above will illuminate.
Setting the Ventilation
Speed
Press and release the Fan button to select LOW or HIGH fan speed. The corresponding “In-
dicator Light” will illuminate. If both LO and Hi indicator lights are off, the fan is OFF but will
turn ON if required by the Dehumidistat or remote Timer (if installed).
20/40 Mode 20 / 40
Press and release the 20/40 button. The light above will illuminate. The unit will run 20 min
on / 40 min off mode in fan defrost models and 20 min on / 40 min recirculation mode on
recirculation damperdefrost models.
Table 7. Two-Speed Switch with Humidity Sensor Settings
Settings Icon Description
Turning on the Control Press and release the ON/OFF button. The light above will illuminate.
Setting the Ventilation
Speed
Press and release the Fan button to select LOW or HIGH fan speed. The corresponding “In-
dicator Light” will illuminate. If both LO and Hi indicator lights are off, the fan is OFF but will
turn ON if required by the Dehumidistat or remote Timer (if installed).
Humidity Control Your unit will reduce indoor humidity when outdoor humidity levels are lower than indoor hu-
midity levels. This feature is only effective when the outdoor temperature is below 59˚F (15˚C).
Setting the Dehumidistat
Press and release the Dehumidistat button until the Dehumidistat Light is at the desired
setting. After a few seconds the Dehumidistat light will either ash or be on continuous. A
ashing 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. The Dehumidistat will override the current speed setting to HIGH speed. The De-
humidistat function can be turned OFF by pressing the button until no Dehumidistat light is
on. Refer to the “How the Dehumidistat Works” on page 10 of this instruction for a detailed
description of Dehumidistat functionality.
IMPORTANT
Only one control can be installed on the system.
Timers will not function when mode of operation is set to “OFF”, unless specically installed for that function. Refer to “Installing Standby
Jumper” on page 25.
Figure 5. Two-Speed Switch
with Intermittent Mode
Figure 6. Two-Speed Switch
with Humidity Sensor
Residential Energy Recovery Ventilators 11
®

PrecisionSYNC Control (435244)
The control offers the most advanced features to control your home’s ventilation.
• Five-speed fan setting
• Standby setting (fan speed 0)
• Electronic dehumidistat
• 20/40/60 HIGH speed override button
• Compatible with Wireless Timer
• Easy to read back-lit LCD screen
• Slim-line design
• Connect to 3-wire 20 gauge low voltage wire
• Precision Balancing (applicable units)*
Table 8. Operational Modes
Function Icon
Continuous Ventilation
20 Minutes On, 40 Minutes Recirculation
20 Minutes On, 40 Minutes OFF
10 Minutes On, 50 Minutes OFF
Continuous Recirculation
Table 9. PrecisionSYNC Control (435244) Settings
Mode Icon Description
Turning on the Control Press and release the ON/OFF button. The light above will illuminate.
Setting the Ventilation
Speed
Press and release the Fan button to select LOW or HIGH fan speed. The corresponding
“Indicator Light” will illuminate. If both LO and Hi indicator lights are off, the fan is OFF but
will turn ON if required by the Dehumidistat or remote Timer (if installed).
20/40/60 High Speed
Button
Press and release the 20/40/60 High Speed button to temporarily initiate HIGH Fan speed
for 20, 40 or 60 minutes. Press once for 20 minutes, twice for 40 minutes, three times for
60 minutes and four times to disable. The timer symbol will appear on the screen and the
corresponding section of the clock will ash to indicate the time interval selected. When
the timer runs out, the unit will return to its previous operating speed.
Setting the
Mode of Operation
There are ve modes of operation available with the PrecisionSYNC Control (435244).
Pressing the Mode button will display the different modes of operation on the screen. Fan
defrost models do not have recirculation modes available.
Setting the Dehumidistat
The PrecisionSYNC Control displays the current indoor humidity in LARGE numbers and
the Dehumidistat setting in SMALL numbers on the screen. If the indoor humidity is above
the set point, the control will initiate HIGH Fan speed operation in Ventilation mode until the
indoor humidity has been reduced below the set point.
Press and release the Dehumidistat button to adjust the Dehumidistat setting. The
Dehumidistat can be set between 25% RH and 60% RH. To disable the Dehumidistat
function on the control, cycle through the setting until OFF is displayed. Refer to “How
the Dehumidistat Works” on page 10 in this instruction for a detailed description of the
Dehumidistat function.
Reset Button RESET The RESET button will clear the current Fan, Timer, Mode and Dehumidistat settings and
set the unit into LOW fan speed, Ventilation mode and a Dehumidistat setting of 40%.
Service Indicator A service indicator appears when the unit requires routine maintenance. Press and hold the
ON/OFF button for 5 seconds to reset the service indicator once maintenance has been
performed.
*Refer to “Precision Balancing” on page 31.
Figure 7. PrecisionSYNC Control
Residential Energy Recovery Ventilators
12
®

Figure 8. 20/40/60 Minute Timer
Figure 9. 20/40/60 Minute Wireless Timer
Figure 10. Wireless Repeater
20/40/60 Minute Timer (435247)
20/40/60 Minute Wireless Timer (435248)
Wireless Repeater (435249)
Timers are available as wired or wireless. The timer will override the operational mode of the
control (regardless of the setting) and initiate HIGH fan speed Ventilation for 20, 40 or 60
minutes. The ERV will return to the selected operational mode and fan speed setting upon
completion of the timer cycle.
Using Timers
Press the button to initiate high speed ventilation for 20, 40 or 60 minutes. The corresponding
status light will illuminate to indicate either 20, 40 or 60 minutes of high speed fan operation.
Press the button until the status lights are no longer illuminated to cancel high speed timer
operation.
Optional Lockout Mode
The Wired Timer has a lockout mode feature that can be set to disable the timer. Set the
lockout mode by holding the button for ve seconds. Disable lock-out mode by holding the
button for 5 seconds. Connect to 3-wire, 20-gauge (min.) low-voltage wire and install in a
standard 2 x 4” (51 x 102 mm) electrical box.
The Wireless Timer pairs wirelessly to the control. Wireless Timers have an estimated range of 40 feet (12 meters) with no
obstructions. To increase the range of the timer, a Wireless Repeater may be used. Multiple timers can be paired to a single control.
They are designed to be mounted in a standard 2 x 4” (51 x 102 mm) electrical box or surface mounted to a wall.
This device is used to extend the range of the Wireless Timer. The Wireless Repeater plugs directly
into a 120 V power outlet.
The Wireless Repeater should be installed at the halfway point between the 20/40/60 Minute Wireless
Timer and the control if the timer is out of range.
When the Wireless Repeater is positioned correctly, a solid green LED will illuminate indicating the
Wireless Repeater has a strong connection to the main wall control and may be moved farther away if
necessary.
* Refer to “Installation and Operation of Wireless Repeater (435249)” on page 23.
Replacing The Battery
The red LED battery indicator will illuminate when the battery on the
timer needs to be replaced. Replace the battery by:
• Pulling the face plate off the wall.
• Replacing the battery located on the back of the Timer Face Plate.
• Re-attaching the face plate to the back plate. Be careful not to
damage the tabs on the back plate when reattaching the face
plate.
* Refer to “Installation and Operation of 20/40/60 Minute Timer
(435248)” on page 21 for pairing instructions.
Back Plate
Face Plate
Residential Energy Recovery Ventilators 13
®

Connecting the Ductwork
The installer must ensure all ductwork is sized and installed as designed to ensure the system will perform as intended.
The amount of air that the ERV unit will deliver is directly related to the total external static pressure of the system. Static pressure is
a measure of resistance imposed on the blower by the length of ductwork plus the number of ttings used in the ductwork.
A well designed and installed ducting system will allow the ERV to operate at its maximum efciency.
All ducts should be kept as short as possible and have as few bends or elbows as possible to maximize airow. 45ºelbows are
preferred to 90ºelbows. Use Y-ttings instead of T-ttings whenever possible.
All duct joints must be fastened with screws, rivets or duct sealant and wrapped with mastic or quality duct tape to prevent leakage.
Mastic is preferred but if duct tape is used it should be the aluminum foil type.
Use galvanized (rigid) ducting whenever possible although exible duct can be used in moderation, if necessary.
A short length (approximately 12 inches [300 mm]) of non-metallic exible duct should be connected between the ERV and the
supply/exhaust duct system to avoid possible noise transfer through the duct system.
All ducts running through attics and unheated spaces must be sealed and insulated to code.
IMPORTANT
Applications such as greenhouses, atriums, swimming pools, saunas, etc. have unique ventilation requirements which should be addressed
with an isolated ventilation system.
Overview of Installation Methods
There are three methods of installation for the ERV:
• Simplied installation - See “Installation Methods - Simplied (Return/Return)” on page 15.
• Partially dedicated installation - See “Installation Methods - Partially Dedicated” on page 16.
• Fully dedicated installation - See “Installation Methods - Fully Dedicated” on page 17.
Shaping Ducting to Fit Oval Ports
Applicable Unit: SYNC-270TCE-S1
This unit has oval supply and exhaust ports. This enables the units to be as
space efcient as possible. Circumference of the port remains the same as
round ducting. Simply bend a standard duct tting to the correct shape and
attach to the oval port using the same method as for a round port.
Figure 11. Shaping Ducting to Fit Oval Ports
Residential Energy Recovery Ventilators
14
®

Backdraft Damper
Leaf Hinge
Installed Vertically
(Recommended)
Outdoors
Damper for
balancing
airflows
Return Air
Cold Air
Return
Forced Air
Furnace
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
The simplied method draws stale air from the cold air return duct of the air handler/furnace
and introduces an equal amount of fresh air farther downstream into the cold air return as
illustrated in the following gures.
Key Points
The ERV unit must be balanced.
• It is mandatory (to eliminate recirculation) that either the furnace blower run continuously
or ERV unit operation be interlocked with the furnace blower.
* Refer to “Interlocking ERV to Air Handler / Furnace Blower” on page 24.
• The duct conguration may change depending on the ERV model. See specications for
your unit.
• Check local codes and authority having jurisdiction for acceptance.
Installation Methods - Simplified (Return/Return)
Figure 13. Simplied Installation (Return/Return)
Figure 12. Simplied Installation (Return/
Return)
Installation Notes:
• See unit specications for exact port locations.
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• Ensure as much distance as possible between the supply and exhaust connections to the cold air return of the furnace.
• The exhaust air connection should be upstream of the supply air connection to prevent exhausting any fresh air.
• Weatherhood arrangement is for drawing purposes only. The weatherhoods are to be installed in accordance with local building
codes or manufacturer recommendations.
• The airow can be conrmed on site using the balancing procedures found in this manual.
Residential Energy Recovery Ventilators 15
®

Backdraft
Damper
Leaf Hinge
Installed Vertically
(Recommended)
Outdoors
Damper for
balancing
airflows
Return Air
Cold Air
Return
Forced Air
Furnace
Exhaust Air from various
parts of building.
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
The partially dedicated installation draws stale air from specic points in the house and
introduces an equal amount of fresh air into the cold air return as illustrated in the following
building gures.
Key Points
The ERV unit must be balanced.
• It is mandatory that the furnace blower run continuously or ERV operation be interlocked
with the furnace blower to evenly distribute the fresh air throughout the house. Refer to
building code.
* Refer to “Interlocking ERV to Air Handler / Furnace Blower” on page 24.
• The duct conguration may change depending on the ERV model. See specications for
your unit.
• Check local codes and authority having jurisdiction for acceptance.
Installation Notes
• See unit specications for exact port locations.
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• A minimum separation of 40” (one meter) is recommended between the two direct connections.
• The exhaust air connection should be upstream of the supply air connection to prevent exhausting any fresh air.
• Weatherhoods are to be installed in accordance with local building codes or manufacturer recommendations.
• The airow must be conrmed on site using the balancing procedures found in this manual.
Installation Methods - Partially Dedicated
Figure 14. Partially Dedicated System
Figure 15. Direct Connection of Supply Air Stream to the Furnace Cold Air Return (Stale air drawn from key areas of home)
Residential Energy Recovery Ventilators
16
®

Backdraft Damper
Leaf Hinge
Installed Vertically
(Recommended)
Outdoors
Stale Air
from various parts of
building
Damper for
balancing
airflows
Fresh Air
to building Damper for
balancing
airflows
Stale Air to Outside
Airflow:
Fresh Air from Outside
Stale Air from Inside
Fresh Air to Inside
The fully dedicated installation draws stale air from specic points in the building and delivers
fresh air to specic locations of the building. This system is not connected to an air handler/
furnace (see the following gures).
KEY POINTS
The ERV unit must be balanced.
• The duct conguration may change depending on the ERV model. See specications for
your unit.
• Check local codes and authority having jurisdiction for acceptance.
Installation Notes
• See unit specications for exact port locations.
• Unit is normally balanced on HIGH speed with the furnace blower ON.
• Weatherhoods are to be installed in accordance with local building codes or manufacturer recommendations.
• The airow must be conrmed on site using the balancing in this instruction
Installation Methods - Fully Dedicated
Figure 17. Fully Dedicated System (Not connected to forced air system)
Figure 16. Fully Dedicated System
Residential Energy Recovery Ventilators 17
®

It is recommended that the ERV unit be located in a conditioned space where it will be possible to conveniently service the unit:
• Complexity of work to install,
• Freezing conditions in the attic,
• Difculty of access for service and cleaning.
Sufcient clearance in front/below (depending on model) of the access door is required for servicing the air lters and core.
Clearance must be enough to allow removal of core from the unit.
Applicable Unit: SYNC-270TCE-S1
This is a procedure for suspending the unit using adjustable hanging straps. Use four screws and washers (eld-provided) to attach
the hanging straps. The washer must be wider than the eyelet of the grommet on the hanging strap. By design, the adjustable
hanging straps reduce the possibility of noise, resonance, and harmonics.
1. Insert the screws and washers (eld provided) through the hanging strap grommets and fasten to a solid vertical surface.
2. Unscrew the four machine screws located on the upper side of the unit. Attach the S hooks and reinsert the machine screws.
3. Hook the bottom grommets of the straps through the S hooks. Pull down vertically on the hand loops while lifting up the bottom
of the cabinet. Repeat at opposite end of the unit.
NOTE: Do not pull the hand loops in a horizontal direction (laterally with the unit) during installation or during adjustment of the
straps.
4. Level the unit from left to right and front to back.
• Adjust the unit down by lifting up on the buckles.
• Adjust the unit up by pulling down vertically on the hand loops while lifting up the bottom of the cabinet.
5. Fold the hand loops and excess strap and secure with a nylon tie (eld provided).
Figure 18. Insert Screws and Washers Figure 20. Hook the GrommetsFigure 19. Unscrew Machine Screw
Buckles
Joist
Hanging Strap Grommets
Screws and Washers
(field provided)
Straps
Hand Loops
Pull down
hand loops.
while
lifting
up on unit
Buckles
“S” hooks
Unit Installation Location
Suspending the Unit
CAUTION
If possible, avoid installing units above areas or equipment that are sensitive to water damage. Otherwise, the use of an auxiliary drain pan
under the installation is recommended.
Risk of carbon monoxide poisoning and/or explosion.
Can cause injury or death.
Combustion and ue gases from heating appliances must never be allowed to enter living spaces.
ERV unit must be properly balanced (see page 29 - 31) to prevent negative pressure in structure. Negative pressure can cause back−drafting
of combustion gases in other household appliances such as gas furnaces, oil furnaces, hot water heaters, wood stoves, replaces, etc.
The following appliances should not be connected to the ERV unit:
• Clothes dryer
• Stove top fan
• Central vacuum system
NOTE: Failure to follow this instruction will void the ERV unit warranty.
Unit Installation Restrictions
Residential Energy Recovery Ventilators
18
®

Ceiling Mounted
Wall Mounted
Must have hinges downward
towards the floor
HINGES
Applicable Units: ASSURE-120S-S1, SYNC-110SE-S1, and SYNC-180SCE-S1
1. Using the hardware provided, install the mounting brackets on the unit. It is important to
isolate the mounting brackets from the mounting surface to minimize vibration.
2. Install the unit to the mounting surface, using the mounting brackets provided.
Note: The ASSURE-120S-S1 and SYNC-110SE-S1 can only be ceiling mounted.
The SYNC 180SCE-S1 can be either ceiling mounted or wall mounted.
Mounting the Unit
IMPORTANT
Do not drill additional holes in the ERV
Due to natural condensate accumulation, the unit must have the door hinges directed towards the oor in wall mount conguration (SYNC-
180SCE-S1 only).
Mounting Brackets
Applicable Unit: SYNC-270TCE-S1. In climates where the outdoor temperature remains above
13ºF (-25ºC) combined with an indoor humidity less than 30%, the use of a drain is optional.
During a defrost cycle, the ERV unit may produce some condensation. This water should ow
into a nearby drain, or be taken away by a condensate pump.
The ERV cabinets has pre-punched holes for the drain as illustrated in “Figure 23. Drain Holes
and P-Trap”.
1. Insert the drain spout through the hole in the drain pan.
2. Tighten the nut which holds the drain spout in place.
Construct a P−Trap using the plastic tee connector as illustrated in “Figure 23. Drain Holes and
P-Trap”.
1. Cut two lengths of hose and connect each piece to an end of the T tting, then connect the
other ends to the two drain spouts.
2. Position the T tting to point upward, and connect the drain line. Tape or fasten base to
avoid any kinks.
3. Pour a cup of water into the drain pan of the ERV after the drain connection is complete.
This creates a water seal which will prevent odors from being drawn up the hose and into
the fresh air supply of the ERV.
Installing the Drain Connection (Optional)
Drain Pan Drain Pan
Drain
Spout
Drain
Spout
Zip Tie
To Drain
Tee Connector
1/2” (13mm) I.D.
Drain House
Drain Pan
Drain
Spout
Drain
Spout
Drain Pan
To Drain
1/2” (13mm)
Hard Pipe
Tee
Joint
Drain Hose Plumbing
Pre-Punched Holes (2)
Hard Pipe Plumbing
Pre-Punched Holes (2)
CAUTION
Do not use sealant when installing the drain spout.
Condensation can accumulate and cause water damage to equipment, nished surfaces and structures.
Do not install ERV or route condensate drain lines in areas that can be subjected to freezing. Potential water damage.
Unit must be installed level to ensure proper condensation drainage. Avoid installing units above areas or equipment that are sensitive to
water damage. Connect condensate drains in accordance with national and local codes. P−Trap and tubing must be located below the ERV
door with a minimum of ¼” per foot downward slope away from unit.
(SYNC-180SCE-S1 only)
Figure 23. Drain Hole and P-Trap
Figure 22. Ceiling Mounting vs. Wall Mounting
Figure 21. Mounting Brackets
Residential Energy Recovery Ventilators 19
®

Applicable Unit: SYNC-270TCE-S1
The plugs are located in the ERV accessories bag. The plugs will be installed into
the two holes located in the bottom tray of the ERV. They must be inserted from
the inside of the unit to ensure the holes are fully sealed.
Installing Drain Plug (Optional)
IMPORTANT
In climates where the outdoor temperature remains above 13ºF (-25ºC) combined with an indoor humidity less than 30%, the use of a drain is
optional.
Figure 24. Optional Drain Plugs
The ERV Dual Intake and Exhaust Hood Kit offers the benet of requiring only one 6” (152 mm) hole in the exterior wall (as opposed
to two separate weatherhoods) to complete the connections for fresh air intake and stale air exhaust. The pressure drop/airow
charts should be referred to when matching the Dual Intake and Exhaust Hood to the ERV. The Dual Intake and Exhaust Hood Kit is
compatible with 5” or 6” diameter duct.
ERV Dual Intake and Exhaust Hood Kit
Air Flow - CFM (Pa)
Static Pressure - in. w.g (Pa)
0.30 (75)
0.20 (50)
0.15 (37.5)
0.25 (67.5)
0.10 (25)
0.05 (12.5)
0.40 (100)
0.35 (87.5)
0
20
(9)
40
(19)
60
(28)
80
(38)
100
(47)
120
(57)
140
(66)
Figure 25. Intake Airflow Chart
Air Flow - CFM (Pa)
Static Pressure - in. wg (Pa)
0.30 (75)
0.20 (50)
0.15 (37.5)
0.25 (67.5)
0.10 (25)
0.05 (12.5)
0.40 (100)
0.35 (87.5)
0
20
(9)
40
(19)
60
(28)
80
(38)
100
(47)
120
(57)
140
(66)
Figure 26. Exhaust Airflow Chart
CAUTION
Follow installation instructions located in Dual Intake and Exhaust Hood kit. Contact your local building authority before installation of the
Dual Intake and Exhaust Hood kit to verify compliance with local building codes.
Residential Energy Recovery Ventilators
20
®