Oxygen 8 SERENA User manual

INSTALLATION
& OPERATION
MANUAL
SERENA ERV

Table of Contents
1.0 Safety Instructions
2.0 Components
3.0 Wiring Diagrams & Airflows
3.1 Furnace/Fan Coil/Heat Pump Interlock
3.2 Airflow for Dierent Knob Positions
4.0 ERV Operational Modes
5.0 Timer Switch & Intermittent Switch
7.0 ERV Typical Installations
6.1 Horizontal and Vertical Installations
6.2 Typical Installations of Single Vents and Access Door
7.0 Airflow Balancing
7.1 Balancing Procedure
7.2 Pitot Tube Airflow Balancing
7.3 Airflow Balancing in Duct
8.0 Maintenance
8.1 Regular Maintenance
8.2 Annual Maintenance
9.0 Troubleshooting

Installation Manual Serena Series
Warning
To reduce the risk of fire, electric shock or injury, observe
the following:
1. Read all instructions carefully before installation,
operation or maintenance of the unit. Failure to comply
with instructions could result in personal injury and/or
property damage.
2. Installation of the unit and the corresponding electrical
wiring must be done by a qualified person and be in
accordance with all municipal and national electrical
codes and pertinent industry standards should be
verified before installation.
3. Use this unit only in the manner intended by the
manufacturer. If you have any questions, contact the
manufacturer.
4. Moving parts: disconnect power supply before opening,
ensure all nuts and screws are securely fastened before
restarting the unit.
5. Before servicing or cleaning the unit, switch power o
at the service panel and lock the service disconnecting
means to prevent power from being switched on
accidentally. When service disconnecting means cannot
be locked, securely fasten a prominent warning device,
such as a tag, to the service panel.
6. When cutting or drilling into a wall or ceiling, make sure
that you do not damage electrical wiring and other
hidden utilities.
7. To reduce the risk of fire, use only metal ductwork.
Do not use any accessories not recommended by the
manufacturer.
8. When performing installation, servicing or cleaning
of the unit, it is suggested to wear safety glasses and
gloves.
9. Do not use this unit for commercial purposes.
10. For residential use only. The unit must be grounded.
11. Do not install in a cooking area.
12. This unit is not designed to exhaust combustion and/or
dilution air for fuel burning appliances.
Packaging Inspection
Open the box and check to make sure all of the parts and
accessories are present and in good condition. If you find
any parts missing or any shipping damage, please contact
our factory or distributor immediately.
Caution
1. Turn the unit OFF during construction or repair to avoid
filter blockage.
2. Exhaust air outside - Do not intake/exhaust air into
spaces within walls, crawl spaces, garage or into attics.
3. The unit must be installed in accordance to National
and Local Building Codes.
4. When leaving the house for a long period of time (more
than two weeks), a responsible person should check if
the unit operates adequately.
Contents
Parts List
• S300
• S500
Wiring Diagram
• Serena Series
• Furnace/Fan Coil/Heat Pump Interlock
Standard Furnace Interlock Wiring
Alternate Furnace Interlock Wiring
ERV Typical Installations
• For Residential
Fully Ducted System
Furnace Return Air-Duct Connection
Semi Ducted System
• For High-Rise Residential
Fully Ducted System
With Fan-Coil System
• Horizontal
• Vertical
• Access Door Installation
• Drain Connection
Air Flow Balancing
• Balancing Procedure
• Pitot Tube Air Flow Balancing
• Air Flow (CFM) Chart for Dierent Knob Position
Maintenance
• Regular Maintenance
• Annual Maintenance
Troubleshooting
Climate Zone
1.0 Safety Instructions
READ AND SAVE THESE INSTRUCTIONS

Installation Manual Serena Series
No. Description Part No. Qty.
1 ERV - Lid, Pan Assembly 9391 1
2 Polypropylene Collar 6" Dia. PBD6C 2
3 Enthalpy Core 9394 N/A
4 Filter 10½" x 12" (MERV4) 9395 2
5 Temperature Sensor 9326 1
6 6" Ø Polypropylene Backdraft
Damper
PBD6 2
7 Fan - Supply/Exhaust 013070 ECM 1
8 Adjustable Door Latch 9319 1
9 Optional Drain Spout Assembly 9320 2
10 Core Locking Bracket 9321 1
11 Nut 014016 1
No. Description Part No. Qty.
12 Safety Switch 9322 1
13 Main Control Board (ECM) 9356 ECM 1
14 Main Control Board Bracket 9355 2
15 Door Hinges 9328 1 Set
12 Safety Switch 9322 1
13 Main Control Board (ECM) 9356 ECM 1
14 Main Control Board Bracket 9355 2
15 Door Hinges 9328 1 Set
16 Mounting Brackets -11136 4
17 "T" Connector 9330 1
2.0 Components
1
2
3
15
46
7
8
9
Note Units come standard with a plug-in style connection, but
may be ordered with direct connections.

Installation Manual Serena Series
3.0 Wiring Diagrams & Airflows
Control Board
Optional Accessories (Not Supplied)
a. Time Switch (TC100)
b. Wall Switch
c. Dehumidistat
d. Time Delay Switch (TC100-120 & TC100-120P)
e. Master On/O Switch for ERV
f. Light
g. Intermittent Switch
Note: When installing timers, intermittent switches or time delay switches, make sure that they are for the appropriate ERV model

Installation Manual Serena Series
Warning
Never connect a 120 volt AC circuit to the terminals of the furnace/fain-coil/heat pump interlock (Standard Wiring). Only use the
low voltage class 2 circuit.
3.1 Furnace/Fan Coil/Heat Pump Interlock
Low Voltage
+5
DAT
C
Speed
Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
Ext. Interlock
HIGH VOLTAGE
Low Voltage
+5
DAT
C
Speed
Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
Ext. Interlock
HIGH VOLTAGE
W R G Y
W
R
G
Y
C
FOUR WIRE
TWO WIRE
heating only
Cooling
System
THERMOSTAT TERMINALS
TWO WIRE
Low Voltage
+5
DAT
C
Speed
Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
Ext. Interlock
HIGH VOLTAGE
Low Voltage
+5
DAT
C
Speed
Contact
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
Ext. Interlock
HIGH VOLTAGE
W R G Y
W
R
G
Y
C
FOUR WIRE
TWO WIRE
heating only
Cooling
System
THERMOSTAT TERMINALS
TWO WIRE
Standard Interlock Wiring
Alternate Interlock Wiring

Installation Manual Serena Series
3.2 Airflow (CFM) Chart for Dierent Knob Positions
Knob Position Knob Position Knob Position Knob Position
S.P. (in.wg) V.P. (in.wg) CFM V.P. (in.wg) CFM V.P. (in.wg) CFM V.P. (in.wg) CFM
00.03 29.5 0.03 118 0.08 213 0.13 274
0.1 0.01 20.0 0.02 99 0.07 194 0.11 258
0.2 0.01 80 0.06 175 0.10 251
0.3 0.055 165.5 0.09 232
0.4 0.05 156 0.08 213
0.5 0.045 146.5 0.07 194
0.6 0.04 137 0.06 175
0.7 0.03 118 0.05 156
0.8 0.02 99 0.045 146.5
0.9 0.04 137
1.0 0.03 118
Knob Position Knob Position Knob Position
S.P. (in.wg) V.P. (in.wg) CFM V.P. (in.wg) CFM V.P. (in.wg) CFM
0 0.21 336 0.25 367 0.29 398
0.1 0.19 320 0.24 359 0.26 375
0.2 0.17 305 0.22 344 0.24 359
0.3 0.15 289 0.20 328 0.23 352
0.4 0.14 282 0.19 320 0.21 336
0.5 0.13 274 0.17 305 0.19 320
0.6 0.12 266 0.16 297 0.17 305
0.7 0.11 258 0.14 282 0.16 297
0.8 0.10 251 0.13 274 0.14 282
0.9 0.08 213 0.12 266 0.13 274
1.0 0.06 175 0.09 232 0.12 266

Installation Manual Serena Series
4.0 ERV Operational Modes Functionality
O Mode
ERV fans are o. Defrost damper is closed (if equipped) to prevent cold air from entering the unit.
Normal Mode
In Normal mode ERV fans run and the unit exchanges indoor air with outdoor air. The airflow exchange can be adjusted in four
preset airflow values. Normal Mode is intended to be requested by the user for long time ERV operation.
High Ventilation Mode
In High Ventilation Mode the ERV fans run and the unit exchanges indoor air with outdoor air, as in Normal Mode, but the airflow
level is much higher. High Ventilation Mode is intended to be requested by the user if he/she requires quick air exchange in the
house.
Energy Saving Mode
The ERV will switch to Energy Saving Mode when it is requested by the User, from the Wall Mount Unit. In Energy Saving Mode
the ERV will automatically run in Auto mode 20 minute per every 4 hours. The rest of the time the unit will stay in OFF mode.
The defrost damper is closed to prevent cold air from entering the unit and the first running will start immediately after the ERV
was set to Energy Saving mode.
Defrost Mode
The unit automatically switches to Defrost mode, when the supply air is below 5°C(41°F), and returns to the last requested mode
when the outdoor air temperature becomes above 15°C(59°F). While defrosting, the exhaust fan runs in High Ventilation Mode
with supply fan shutting o and damper closed. Supply temperature is measured by a temp. sensor located in the ERV supply air
discharge duct. The Defrost Mode is an automatic mode which cannot be enabled/disabled by the user.

Installation Manual Serena Series
5.0 Timer Switch & Intermittent Switch (Optional)
1. TC100-5V
The Timer Switch Unit consists of 3 LEDs and 1 push button. The Timer Switch Unit can put the unit into High Speed Mode for
the set time on the Timer Switch (20 min, 40 min, 60 min).
When a timed cycle is complete the unit returns to normal run mode set on the Wall Control unit. When a Timer Switch is
activated, the other Timer Switch blinks its LED and Wall Mount Unit lights up its REMOTE icon on the LCD screen indicating that
the ERV has been forced into High Speed Mode.
If there are more than one Timer Switches activated, the Timer Switch with the longest time takes control, and only that Timer
Switch can turn o the timer switch operation. All 3 LEDs will blink to indicate error if the Control Board reports error or the Timer
Switch loses communication with the Control Board.
2. IC-100-5V
The Intermittent Switch allows users to select one of the following operation modes:
1. Low Speed Mode
2. High Speed Mode
3. Intermittent Mode
4. OFF Mode (Optional - Contact factory for details and to order)
On initial power up, Low Speed Mode and the second LED light are on. With another button press, the timer switch goes into
Intermittent Mode and the third LED light is on. In Intermittent Mode, the ERV starts with 20 minutes of low speed, which is
followed by 40 minutes o. The cycle is continued until intermittent mode is exited. By pressing a button, the timer switch moves
to OFF mode and all LED lights are o (optional)
3. TC-100-120
The Timer Switch activates the ERV on high speed for 5, 10, 15 & 30 minutes. Once an option is selected, the LED will turn on,
indicating the duration of the high speed mode. Once the duration is up, the unit will go back to normal mode and the LED light
will turn o.
4. TC-100-120P
The TC-100-120P is a 24 hour programmable Timer Switch that allows for the unit to be shut o for a pre-selected duration and
come back on when the time delay has been achieved.
Timer Switch
Model #TC100-5V
(5 VDC)
Timer Switch
Model #TC-100-120
(120 VDC)
Timer Switch (Programmable)
Model #TC-100-120P
(120 VDC)
Intermittent Switch
Model # IC-100-5V
(5 VDC)

Installation Manual Serena Series
6.1 Horizontal and Vertical Installations
STRAPPING SYSTEM: (optional)
Allows one person installation for
vertical and horizontal installation.
UP
UP
PULL
DOWN
Strap
jtantay 01.28.11
*NOT SUPPLIED
1
.3
2
.
2
1
ya
t
n
a
t
j1
Vibration
Spring
Washer*
Screw*
CHAIN MOUNTING
SYSTEM: (optional)
Available for both
horizontal & vertical
installation.
Chain*
Backdraft
Damper
Concrete
Concrete
Wooden Joist
Bracket
(Supplied)
Grommet*
Washer*
Backdraft Damper
Screw*
Flap
Flap
Backdraft Damper
28"
30"
14"
28"
14"
30"
30" clearance (300 cfm) and 34" clearance (500 cfm) is recommended for cleaning of the core and servicing the unit.
Dampers are installed for horizontal installation. For vertical installation, both dampers must be turned so they can open and close properly
when there is any backdraft.
Make sure no screw will interfere the function of the backdraft damper flaps while installing the duct work to the ERV.
Horizontal
Vertical
Note
After installation, make sure the/ERV is properly leveled. If not leveled correctly, then defrost will not perform eectively and/or
the unit may frost in winter.
6.0 ERV Typical Installations

Installation Manual Serena Series
6.2 Typical Installations of Single Vents and Access Door
Intake Exhaust
Notes
Fresh air intake and supply duct must be totally insulated. The Exhaust duct must be 5' insulated from the wall. In colder
climates, it is recommended to insulate all exhaust and supply ducts.
Check building codes for insulation requirements.
Use appropriate access door sizes and install on the correct location for easy access to all ERV components for routine check
and maintenance of the unit.

Installation Manual Serena Series
7.0 Air Flow Balancing
7.1 Balancing Procedure
It is required to have balanced airflows in an ERV. The volume of air brought in from the outside must equal the volume of air
exhausted by the unit while running at a normal speed. If the airflows are not properly balanced, then:
The ERV may not function at its maximum eciency.
A negative or positive air pressure may occur in the house or condo.
The unit may not defrost properly.
Prior to balancing, ensure that:
1. All of the ERV components are in place and functioning properly.
2. All sealing of the ductwork system has been completed.
3. Set the unit to normal speed.
4. Airflows in branch to specific areas of the house should be adjusted first prior to balancing the unit.
5. After taking a reading of both the stale air to the ERV duct and fresh air to the house duct, the duct with the lower CFM
reading should be left alone while the duct with the higher airflow should be slowed down to match the lower reading by
adjusting the dial/speed controller on the control board.
6. Return the unit to the appropriate fan speed for normal operation.
The following is a method of field balancing an ERV using a Pitot tube in
situations when flow stations are not installed in the ductwork. This procedure
should be performed with the ERV on normal speed.
The first step is to operate all mechanical systems on the most desired speed,
which will have an influence on the ventilation system, i.e. the forced air furnace
or air handler is applicable. This will provide the maximum pressure that the ERV
will need to overcome, and allow for a more accurate balancing 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 capable of reading
from 0 to 0.25 in. (0-62 Pa) or other digital airflow meter. The tube coming out
of the top of the pitot is connected to the high-pressure side of the gauge/
meter and the tube coming out of the side of the pitot is connected to the low
pressure or reference side of the gauge/meter.
Insert the Pitot tube into the duct, pointing the tip into the airflow. For general
balancing, it is sucient to move the pitot tube around in the duct and take an
average or typical reading. Repeat this procedure in the other duct. Determine
which duct has the highest airflow (highest reading on the gauge), then slow
down that motor speed by adjusting the dial/speed controller on the control
board to match the lower reading from the other duct. The flows should now be
balanced. The actual airflow can be determined from the gauge/meter reading.
The value read on the gauge is called the velocity pressure and on the flow
meter is called the air velocity (FPM). The Pitot tube comes with a chart that will
give the air flow velocity based on the velocity pressure indicated by the gauge.
Note
Place the magnehelic gauge on a level
surface and adjust it to zero.
Pitot Tube and Gauge
7.2 Pitot Tube Airflow Balancing
This velocity will be in either feet for minute
or meters per second. To determine the
actual airflow, the velocity is measured by
the cross sectional area of the duct being
measured.

Installation Manual Serena Series
7.3 Airflow Balancing in Duct
Notes:
For balancing, the extension box cover plate is provided
with 3 holes on the supply side and 3 holes on the exhaust
side.
Do not use the Pitot tube to open holes in the insulation as
it may block/damage the Pitot tube.
Take 3 readings on each hole and average all 9 readings
for supply and same for exhaust.
After balancing is finished, plug all six holes with the plastic
plugs provided with the unit.
Notes:
To take more accurate readings, use option #1 if possible.
The accuracy of the flow reading will be aected 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 section 5.2.
∆P" CFM
6" 7"
0.004 0.002 50
0.006 0.003 60
0.008 0.004 70
0.010 0.006 80
0.013 0.007 90
0.016 0.009 100
0.020 0.011 110
0.023 0.013 120
0.027 0.015 130
Duct Diam. Cross Sect. Area
6" 0.196 sq. ft.
7" 0.267 sq. ft.
∆ P" = Velocity Pressure in inches
CFM = Opening / Cross-Sectional Area (sq.ft.) x velocity (FPM)
option #2

Installation Manual Serena Series
8.0 Maintenance
8.1 Regular Maintenance
8.2 Annual Maintenance
1. Turn o the unit and disconnect the power supply.
2. Unlatch the door and lift the door panel towards you, hold it firmly and slide it to the left.
3. Clean the inside of the door and drain pan with a damp cloth to remove dirt and debris
that may be present.
4. Clean the filters (twice a year)
a. Remove the filters, b. Vacuum to remove most of the dust, c. Wash with a mixture of
warm water and mild soap. Rinse thoroughly and shake filters to remove water and let
dry.
5. Oil/grease defrost damper lever and hinges.
6. Check the airflow sensors twice a year for lint/duct accumulation. If necessary, clean the
sensors with a lint-free cloth. Take extra care while handling. Ensure the sensor goes
back to the supply diuser and the exhaust sensor goes back to the exhaust diuser on
the same original position.
7. Check the exterior fresh air supply hood:
Make sure there are no leaves, twigs, grass, ice or snow that could be drawn into the
vent. Partial blocking of this air vent could cause the unit to malfunction.
8. Reassemble the components, filters and door (the door is secured when you hear a click).
9. Reconnect the power and turn on the unit.
Repeat steps 1-5 from section 6.1 and continue with the following steps:
1. Clean the ERV Core: Remove the filters, loosen the core locking bracket, remove the core by
carefully gripping the ends of the core and pull evenly outward.
ERV Core
Remove dust using a vacuum cleaner.
2. Motors: Maintenance free and permanently lubricated.
3. Drain Tube and Drain Pipe: Inspect the drain pipe, drain tube and "P" trap for blockage, mold
or kinks. Flush with warm soapy water and replace if worn, bent to unable to clean.
4. Clean Ductwork if Required: Wipe and vacuum the duct once every year. The ductwork
running to and from the ERV may accumulate dirt. You may wish to contact a heating/
ventilation company to do this.
5. Cleaning the Fans: Fans may accumulate dirt causing an imbalance and/or excessive
vibration on the ERV. A reduction in airflow may also occur. In new construction, this may
result within the first year due to heavy dust and may occur periodically after that over time
depending on the outdoor conditions.
a. Open the service door, b. Remove the core, c. Disconnect the fan motor wires, d. Pull
the fan assembly out of unit, e. Check for any accumulation on the blades, f. Clean with a
small brush if necessary: scrub individual fan blades until clean, vacuum and wipe, g. Put the
components back in place, h. Reconnect the power supply and turn the unit back on
Warning
Do not use a cleaning solution
for the ERV core
Do not use a pressure washer
on the ERV core
Do not place the ERV core in
the dishwasher
Do not use bleach or chlorine
Warning
Electrical shock hazard. Can
cause injury or death. Before
attempting to perform and
service or maintenance, always
disconnect the unit from its
power source.

Installation Manual Serena Series
9.0 Troubleshooting
Problems Possible Causes Solution
1. Airflow is too low ERV airflow is improperly balanced (for units
without built-in Automatic Electronic Air
Balancing)
Filter clogged
Core Obstructed
Exterior fresh air supply blocked
Ductwork is restricted
Power supply is low (low voltage)
Have professional balancer or contractor
balance the unit
Remove and clean filter
Remove and clean core
Remove and clean the blockage
Inspect the duct installation
Switch o the unit immediately and call the
electrician to check the voltage
2. Senses cold air from supply Exhaust hood outside the house is blocked
ERV airflow improperly balanced (for units
without built-in Automatic Electronic Air-
Balancing)
Outdoor temperature is extremely cold
Remove the blockage and clean the hood
Have professional balancer or have a
contractor balance the unit
Placement of furniture or closed door is
restricting the movement of air in the home
Install a duct heater
3. Time switch 20 / 40 / 60 minute /
Intermittent Switch light doesn't stay
on
Loose connection
The switch may be defective
Turn o the ERV breaker
Check connection
Replace the timer switch
Reset the main controller
4. Unit is not defrosting properly Fresh air duct may be frozen
ERV airflow is improperly balanced
Temp. sensor may be defective
Check and remove ice
Have a professional balancer or contractor
balance the unit
Replace the temperature sensor
5. All 3 LEDs of timer switch blink Control board reports error
Lost communication with control board
Refer to problem 4.
Check all wire connections on timer switch
and main control board
6. LEDs on the Main Control Board and
the remote all mount Timer Switch
flashes 0.5 seconds On, 2 seconds
O, then repeats the cycle
Exhaust fan open circuit
a. Motor burned
b. Fan overheated
Replace the motor
Call a technician (if possible, replace the fan)
7. LEDs on the Main Control Board and
the remote wall mount Timer Switch
flashes 0.5 seconds On / 0.5 seconds
O / 0.5 seconds On, then 2 seconds
O, then repeats the cycle
Damper obstructed
Exhaust fan jam/over-current
Check backdraft damper, no screw must
interfere with the function of the damper
Replace the fan
8. LEDs on the Main Control Board and
the remote wall mount Timer Switch
flashes 0.5 seconds On / 0.5 seconds
O / 0.5 seconds On / 0.5 seconds O
/ 0.5 seconds On, 2 seconds O, then
repeats the cycle
Supply fan open circuit
a. Motor burned
b. Fan overheated
Replace the motor
Call a technician (if possible, replace the fan)
9. LEDs on the Main Control Board and
the remote wall Timer Switch flashes
0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On, 2 seconds O, then
repeats the cycle
Damper obstructed
Supply fan jam
Check back-draft damper, no screw must
interfere with the function of the damper
Replace the fan

Installation Manual Serena Series
10. LEDs on the Main Control Board and
the remote wall mount Timer Switch
flashes: 0.5 seconds On / 0.5 seconds
O / 0.5 seconds On / 0.5 seconds O
/ 0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On, 2 seconds O, then
repeats the cycle
Replace the temperature sensor
Note
Lightning, high power surge or high frequency radio signals could cause ERV to go into safe mode (unit complete shuts o and
timer switch blinks either two or four times in a row every 2 seconds). If this happens, turn "o" the main power of the ERV and
restart the unit. If the unit still does not turn on, call a service technician.