Field Controls FAVC Installation Manual

FRESH AIR VENTILATION CONTROL

READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY

BEFORE PROCEEDING WITH THE INSTALLATION.

Model: FAVC

ITEMS INCLUDED:

1 – Fresh Air Ventilation Controller

1 – Mounting Hole Template

1 – Instruction and Installation Manual

1 – Mounting Packet containing
two (2) Sheet Metal Screws

1 – ODT Sensor Packet containing
temperature sensor, sheet metal
screw and two (2) wire nuts

The Field Controls Fresh Air Ventilation Control

TM

(FAVC) is designed to provide fresh air ventilation
year-round, keeping energy conservation, indoor air quality and comfort in mind. The FAVC delivers
ventilation along with many additional features:

• Meets the requirements of the ASHRAE 62.2 standard for ventilation.

• Supplied with an outdoor temperature sensor which mounts in the fresh air duct.

• Has three selectable Climate Zones with unique ventilation inhibit parameters for the selected
climate.

• Monitors up to four exhaust appliances within your home to adjust ventilation needs based on
total appliance operation.

• Can provide Make-Up air in response to an exhausting appliance.

• Can utilize an exhaust fan to drive ventilation independent of the central HVAC fan to save energy.

• Continuously monitors indoor Relative Humidity:

- Lower excess indoor humidity during hot muggy days by reducing ventilation during
these periods to prevent discomfort and mold growth in the home.

- Reduce condensation and corrosion of the heat exchanger.

READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY

This device MUST be installed by a qualifi ed agency in accordance with the manufacturer's installation instructions. The defi nition of
a qualifi ed agency is: any individual, fi rm, corporation or company which either in person or through a representative is engaged
in, and is responsible for, the installation and operation of HVAC appliances, who is experienced in such work, familiar with all the
precautions required, and has complied with all the requirements of the authority having jurisdiction.

Please retain these instructions after installation.

BEFORE PROCEEDING WITH THE INSTALLATION.

Installed By: Phone:

www.fi eldcontrols.com

Installation Date:

P/N 780100700 07/18 Rev F

(THIS PAGE LEFT INTENTIONALLY BLANK)

P/N 780100700 07/18 Rev F

Page 2 of 36

TABLE OF CONTENTS

1. FAVC LAYOUT - OVERVIEW 5

2. GATHER INFORMATION/ RECORD/ SET CONTROL 6
2A Determine The Required CFM Continuous 6,7

Residential Ventilation

2B Determine Fresh Air Intake 8,9

3. INHIBIT SET-UP - Dip Switches 1 & 2 10

3A Climate Zone Inhibit Options 10

3B Normal Climate Zone 11

3C Cold Climate Zone 12

3D Hot Climate Zone 12

4. OPTIONAL APPLIANCE MONITORING 13,14

5. MAKE-UP AIR OPTIONS - Dip Switch 3 15

page

6. ENERGY SAVING OPTION - Dip Switch 4 15

7. INSTALLATION 16

7A. Installation Locations 16

ii. FAVC Mounting
iii. Intake Air Connection/Duct Installation

iv. Fresh Air Damper or HRV/ERV location

7B Wiring and Connections 21

i. Ventilation Control Connections
ii. Thermostat and Air Handler Connections
iii. Outdoor Temperature Sensor (ODT) Connection
iv. Outdoor Temperature Sensor LED Status
v. Appliance Monitoring Connections

8. MAINTENANCE AND TROUBLESHOOTING 29

9. SPARE PARTS AND OPTIONAL ACCESSORIES 30

i. FAVC location

20

25

16,17
18

19

21
22-24
25

26-28

10. SIZING OF FRESH AIR DAMPER AND HRV/ERV 31

10A How to size Fresh Air Damper 31-33
10B How to size an HRV/ERV 33

Page 3 of 36

P/N 780100700 07/18 Rev F

Thank you for purchasing the Fresh Air Ventilation ControlTM (FAVC) by Field Controls. This ventilation controller
is compatible with any HVAC system having accessible 24VAC R, C, W, Y, G terminals.

DANGER

• To prevent serious injury from electrical shock, this product must be installed by a qualified agency.

• 120 VAC can cause serious injury from electric shock. Some installations may require electrical
connections to line voltage sources.

• Before installing the FAVC, turn off all power to your HVAC system.

• When servicing FAVC system or components attached to FAVC system, turn off all power to these
items.

CAUTIONS

• Read entire manual and follow all instructions carefully.

• Follow all local electrical codes during installation.

• All wiring must conform to local and national electrical codes.

• Use caution when mounting components to surfaces that may have concealed wiring beneath the surface.

• Do not mount the FAVC controller on the supply plenum or supply ductwork.

• Do not mount the FAVC controller immediately downstream from any fresh air intake port, humidifi er or
bypass outlet. False humidity conditions will cause the FAVC controller to operate incorrectly.

• Do not use the ventilation system for removal of fl ammable fumes or gases.

• Do not install ventilation controller in an outdoor location and/or wet location.

• Do not obstruct or cover the fresh air intake or air outlet of the ventilation system.

• Provisions should be made for make-up air requirements based on recommendations set forth by governing
agency to meet applicable building codes and ventilation standards.

WARNING

• Sharp metal edges (ductwork) can cause serious injury from cuts.

• Wear appropriate gloves when cutting, drilling and grinding plenum openings and handling ductwork.

• Wear appropriate eye protection when drilling, grinding and/or cutting ductwork.

FAVC SPECIFICATION: Power Requirements (Class 2 Appliance)

Input Voltage 20-30 VAC

Minimum VA Required 1.7 VA @ 24 VAC (full load current at nominal 24 VAC)

Supplied by the HVAC power source
Wiring Requirements 18-22 AWG, 24 VAC (Min)
Operating Temperature Range 10°F to 160°F
Operating Humidity Range 5 to 95% RH (non-condensing)

Outputs Maximum Load

Fan Output GF (Maximum Load Current): 3A inductive @24VAC (thermostat fan signal)
Vent (V, V) (Maximum Load Current): 3A inductive @24VAC (unsourced and isolated)
Exhaust (E, E) (Maximum Load Current): 3A inductive @24VAC (unsourced and isolated)

Inputs

Fan Input GT (Monitor Circuit Current): 5mA @24VAC (sourced from thermostat fan signal)
Heat Input W (Monitor Circuit Current): 5mA @24VAC (sourced from thermostat W signal)

Isolated Inputs (Monitoring)

Appliances #1 - 4

(A1, A2, A3, A4, A1C, A2C, A3C, A4C):

P/N 780100700 07/18 Rev F

5mA @24VAC, TVS protected (requires common connection)

Page 4 of 36

1. FAVC LAYOUT - OVERVIEW

Page 5 of 36

FIGURE 1: FAVC Functional Product Layout (shown with cover removed)

P/N 780100700 07/18 Rev F

2. GATHER INFORMATION/RECORD/SET CONTROL

Continuous CFM

Rate Dial

CFM

Settings

Cool Ventilation

CFM Rate Dial

CONTINUOUS 25 200 100

Minimum Maximum Factory

COOL VENT 25 700 400

HEAT VENT 25 700 400

Heat Ventilation

CFM Rate Dial

FIGURE 2:

VENTILATION ONLY DIAL SETTINGS

To Turn OFF or Deactivate Ventilation of the FAVC:

1. Before turning off, mark the current heat and cool vent settings with a permanent marker, or write
the value on the inner cover for reference in the event the manual has been lost.

2. Set both heat vent and cool vent to lowest possible setting by turning the dial all the way in a
counter clockwise rotation until it stops turning.

TABLE 1: Air Flow Dial Ranges and Factory Settings

3. The FAVC will shut down within 20 seconds and remain inactive.

To Turn ON or Reactivate Ventilation of the FAVC:

1. Turn the dials of the heat vent and cool vent back to the desired value as marked or noted previously.

2. The FAVC will begin to ventilate on a cycle per the settings.

2A. DETERMINE THE REQUIRED CFM CONTINUOUS RESTIDENTIAL VENTILATION

1. How many square feet of condition space will be ventilated with this appliance?
A. Make sure to include the following: basements, and/or bonus rooms within the

buildings thermal envelope.
B. Determine the number of bedrooms.

2. Select the appropriate ASHRAE 62.2 Residential Ventilation Standard that’s been adopted by your
state or by the local authority having jurisdiction.

3. Use the appropriate ventilation table 2A or 2B.

4. Select the building square footage equal or closes to your application.

5. Select the number of bedrooms associated with your application.

6. Locate where the square footage row and bedroom column intersect. This determines the CFM
continuous ventilation dial setting.

7. Record and save the continuous volume determined for your application.

P/N 780100700 07/18 Rev F

Page 6 of 36

2A Number of Bedrooms

Sq Ft 1 2 3 4 5 6

500 20 28 35 43 50 58

600 21 29 36 44 51 59

700 22 30 37 45 52 60

800 23 31 38 46 53 61

900 24 32 39 47 54 62

1000 25 33 40 48 55 63

1100 26 34 41 49 56 64

1200 27 35 42 50 57 65

1300 28 36 43 51 58 66

1400 29 37 44 52 59 67

1500 30 38 45 53 60 68

1600 31 39 46 54 61 69

1700 32 40 47 55 62 70

1800 33 41 48 56 63 71

1900 34 42 49 57 64 72

2000 35 43 50 58 65 73

2100 36 44 51 59 66 74

2200 37 45 52 60 67 75

2300 38 46 53 61 68 76

2400 39 47 54 62 69 77

2500 40 48 55 63 70 78

2600 41 49 56 64 71 79

2700 42 50 57 65 72 80

2800 43 51 58 66 73 81

2900 44 52 59 67 74 82

3000 45 53 60 68 75 83

3100 46 54 61 69 76 84

3200 47 55 62 70 77 85

3300 48 56 63 71 78 86
3400 49 57 64 72 79 87
3500 50 58 65 73 80 88

2B Number of Bedrooms

Sq Ft 1 2 3 4 5 6

500 30 38 45 53 60 68

600 33 41 48 56 63 71

700 36 44 51 59 66 74

800 39 47 54 62 69 77

900 42 50 57 65 72 80

1000 45 53 60 68 75 83

1100 48 56 63 71 78 86

1200 51 59 66 74 81 89

1300 54 62 69 77 84 92

1400 57 65 72 80 87 95

1500 60 68 75 83 90 98

1600 63 71 78 86 93 101

1700 66 74 81 89 96 104

1800 69 77 84 92 99 107

1900 72 80 87 95 102 110

2000 75 83 90 98 105 113

2100 78 86 93 101 108 116

2200 81 89 96 104 111 119

2300 84 92 99 107 114 122

2400 87 95 102 110 117 125

2500 90 98 105 113 120 128

2600 93 101 108 116 123 131

2700 96 104 111 119 126 134

2800 99 107 114 122 129 137

2900 102 110 117 125 132 140

3000 105 113 120 128 135 143

3100 108 116 123 131 138 146

3200 111 119 126 134 141 149

3300 114 122 129 137 144 152

3400 117 125 132 140 147 155

3500 120 128 135 143 150 158

Table 2A: Continuous Ventilation Rate in CFM

per ASHRAE 62.2-2010 Standard

Continuous Calculation

Page 7 of 36

Table 2B: Continuous Ventilation Rate in CFM

per ASHRAE 62.2-2013/2016 Standard

P/N 780100700 07/18 Rev F

2B. DETERMINE FRESH AIR INTAKE

Flow Hood Anemometer Method

1. Use a fl ow hood or handheld rotary blade anemometer. Follow the instruments recommend
procedures for obtaining an accurate measurement.

2. During a Heating and Cooling cycle take a measurement and record the CFM volume through the
outdoor fresh air intake.

Heat

Cool

Static Pressure Method

1. Locate where the fresh air intake and return air duct connect.

2. Use a monometer following the instruments recommended procedure for obtaining an accurate
static pressure measurement. Take measurements in the fresh air intake duct approximately one
foot from the return air and fresh air intake connection.

3. Record the average static pressure measurement for a heating and cooling cycle.

4. Determine the fresh air intake internal round duct size and type. If square or rectangular duct
convert free area to the nearest round duct size.

5. Determine the fresh air intake systems total equivalent feet.
How many elbows, reducers and straight pipe used in construction of the fresh air intake duct.
For additional details see section 10.

6. Using table 3
a) Select your damper and air intake hood size.
b) Moving to the right select your systems total equivalent feet
c) From the top locate your systems Cooling or Heating cycle measured negative static

pressure.
d) Select your systems duct type Smooth or Flex
e) Drop down your selected duct type column to where it intersects with your

predetermined equivalent feet row.
f) Your estimated Cooling CFM has been determined. Record and save.
g) Repeat the process if Heating cycle static pressure is different.

Note: If Cooling and Heating cycle static pressure is the same continue.

P/N 780100700 07/18 Rev F

Page 8 of 36

Table 3: Fresh Air Damper Sizing Air Flow (CFM) Table

Determine Determine
Static (Heat Mode) Static (Cool Mode) Equiv. Ft. Heat CFM Cool CFM

If Static and Duct Design are Known Use Table 3

1. Enter Intake Design Static Pressure

2. Enter Intake Duct Equivalent Feet

3. Type of Intake Duct - Smooth or Flex

4. Enter Diameter of Intake Pipe

5. Determine CFM from Table 3

Control Setup

Set CFM Continuous Dial

Carefully adjust the CFM continuous dial. Use the recorded volume that was determined from table
2A or 2B and recorded in Section 2A.

Note: Locate arrow on the dial stem. Align to the desired continuous volume.

Set CFM Cool Vent Dial

Carefully adjust the CFM Cool Vent dial. Use the recorded volume that was determined from using
one of the previous methods and Recorded in Section 2B.

Note: Locate arrow on the dial stem. Align to the desired volume.

Set CFM Heat Vent Dial

Carefully adjust CFM Heat Vent dial to volume determined from using one of the predetermined
methods and recorded in Section 2B.

Note: Locate arrow on the dial stem. Align to the desired volume.

Page 9 of 36

P/N 780100700 07/18 Rev F

The FAVC is equipped with 4 DIP switches to confi gure climate settings, fan control with appliance
#3 and to enable or disable energy saving mode.

The FAVC is factory shipped with DIP switches 1 & 2 set

to ON (Enabled) position and DIP switches 3 & 4 OFF (Disabled) position.

The 4 modes for

CLIMATE SETTINGS

are: Disabled, Cold, Hot or Normal as controlled by DIP

Switch
1 and 2 shown in Figure 3. Refer to Figure 4 to confi gure FAVC for Normal, Cold, Hot or to Disable
climate modes. The various climate operational tables are shown in Figures 6 (Normal Climate),
7 (Cold Climate) and 8 (Hot Climate).

The FAVC is shipped from the factory: Normal (DIP Switches

1 & 2 in ON position).

If you do NOT want to use humidity control function, change climate setting to

disabled.

3. INHIBIT SET-UP - DIP SWITCHES 1 & 2

For the three active climate modes (Hot, Cold and
Normal), the relative humidity will have a range of
limits based on outdoor temperatures. During the
summer months, when outdoor temperatures
are at 85°F or higher, the FAVC will prohibit
ventilation if the measured RH is 65% or
above. When indoor RH drops below 60%,
the fresh air ventilation will be permitted. When
outdoor temperatures drop below 80°F, the
indoor RH limits change. When the indoor
RH rises above 55%, the fresh air ventilation is
prohibited. When the indoor RH drops below 50% the
ventilation will be permitted. RH limit function
has a 5% hysteresis before resuming fresh air
ventilation.

One exception, during winter months
when outdoor temperatures are cold, the fresh air
ventilation will be

permitted when RH values are

above the 55% limit.

During the Ventilation process
in cold weather, if the RH increases, the RH limit
will be enabled until the RH drops below 50%.

In Climate Mode: DISABLED,

the FAVC will
operate with two temperature limits for hot and cold
temperature extremes. The high temperature limit
is fi xed at 100°F and low temperature limit is fi xed
at 0°F. Change in indoor Relative Humidity will
have no effect on ventilation. Plenum protection will
remain active.

3A. CLIMATE ZONE INHIBIT OPTIONS

The FAVC is equipped with 4 DIP switches to confi gure climate settings, fan control with appliance
#3 and to enable or disable energy saving mode.

to ON (Enabled) position and DIP switches 3 & 4 OFF (Disabled) position.

The FAVC is factory shipped with DIP switches 1 & 2 set

The 4 modes for
1 and 2 shown in Figure 3. Refer to Figure 4 to confi gure FAVC for Normal, Cold, Hot or to Disable
climate modes. The various climate operational tables are shown in Figures 6 (Normal Climate),
7 (Cold Climate) and 8 (Hot Climate).

1 & 2 in ON position).

disabled.

For the three active climate modes (Hot, Cold and
Normal), the relative humidity will have a range of
limits based on outdoor temperatures. During the
summer months, when outdoor temperatures
are at 85°F or higher, the FAVC will prohibit
ventilation if the measured RH is 65% or
above. When indoor RH drops below 60%,
the fresh air ventilation will be permitted. When
outdoor temperatures drop below 80°F, the
indoor RH limits change. When the indoor
RH rises above 55%, the fresh air ventilation is
prohibited. When the indoor RH drops below 50% the
ventilation will be permitted. RH limit function
has a 5% hysteresis before resuming fresh air
ventilation.

when outdoor temperatures are cold, the fresh air
ventilation will be
above the 55% limit.

in cold weather, if the RH increases, the RH limit
will be enabled until the RH drops below 50%.

In Climate Mode: DISABLED,

operate with two temperature limits for hot and cold
temperature extremes. The high temperature limit
is fi xed at 100°F and low temperature limit is fi xed
at 0°F. Change in indoor Relative Humidity will
have no effect on ventilation. Plenum protection will
remain active.

CLIMATE SETTINGS

If you do NOT want to use humidity control function, change climate setting to

One exception, during winter months

permitted when RH values are

During the Ventilation process

are: Disabled, Cold, Hot or Normal as controlled by DIP

The FAVC is shipped from the factory: Normal (DIP Switches

the FAVC will

Switch

FIGURE 3: DIP Switches 1 and 2

CLIMATE SETTING

DIP 1 DIP 2 FUNCTION

ON ON NORMAL

OFF ON COLD

ON OFF HOT

OFF OFF DISABLED

FIGURE 4:
DIP Switch Positions for Climate Setting

P/N 780100700 07/18 Rev F

Page 10 of 36

COLD CLIMATE

NORMAL CLIMATE

HOT CLIMATE

FIGURE 5: Suggested Climate Zone Setting Based on North America Region

For all climate modes, the FAVC incorporates a hysteresis algorithm program designed to limit ventilation
control based on the relationship between outdoor temperature and relative humidity level changes
within the home.

3B. NORMAL CLIMATE ZONE

In Climate Mode: NORMAL The FAVC will provide fresh outside ventilation if the outside temperature is

between 100°F and 17°F depending on if the HVAC system is in heating or cooling mode and depending
on indoor relative humidity change during the ventilation cycle. Below 25°F outside temperature and in
heating mode, the ventilation is restricted to 25% depending on if indoor humidity is above or below 50%
RH. Above 90°F outside temperature and in cooling mode, the ventilation is restricted to 25% depending
on if indoor humidity is above or below 60% RH. Between 25-40°F outside temperature, ventilation
requires heating and if indoor humidity level is above 50% RH and RH continues to increase, then fresh
air ventilation is limited to prevent induct condensation from occurring.

FIGURE 6: Normal Climate Operation

Page 11 of 36

P/N 780100700 07/18 Rev F

3C. COLD CLIMATE ZONE

In Climate Mode: COLD The FAVC will provide fresh outside ventilation if the outside temperature

is between 100°F and 0°F depending on if the HVAC system is in heating or cooling mode and
depending on indoor relative humidity change during ventilation cycle. Below 25°F outside
temperature and in heating mode, the ventilation is restricted to 25% depending on if indoor
humidity is above or below 50% RH. Above 90°F outside temperature and in cooling mode, the
ventilation is restricted to 25% depending on if indoor humidity is above or below 60% RH. Between
25-50°F outside temperature, ventilation requires heating and if indoor humidity level is above 50%
RH and RH continues to increase, then fresh air ventilation is limited to prevent induct condensation
from occurring.

FIGURE 7: Cold Climate Operation

3D. HOT CLIMATE ZONE

In Climate Mode: HOT The FAVC will provide fresh outside ventilation if the outside temperature

is between 100°F and 25°F depending on if the HVAC system is in heating or cooling mode
and depending on indoor relative humidity change during ventilation cycle. Below 32°F outside
temperature and in heating mode, the ventilation is restricted to 25% depending on if indoor
humidity is above or below 50% RH. Above 90°F outside temperature and in cooling mode, the
ventilation is restricted to 25% depending on if indoor humidity is above or below 60% RH. Between
32-40°F outside temperature, ventilation requires heating and if indoor humidity level is above 50%
RH and RH continues to increase, then fresh air ventilation is limited to prevent induct condensation
from occurring.

P/N 780100700 07/18 Rev F

FIGURE 8: Hot Climate Operation

Page 12 of 36

4. OPTIONAL APPLIANCE MONITORING

The FAVC provides 4 optional monitors to optimize energy usage and ventilation effi ciency based on
activity of connected venting appliances. Refer to Figure 9 for optional appliance dial display and
Table 4 for Appliance dial ranges and factory settings.

Appliance
#1

Type of

Appliance

HRV/ERV or

Bathroom Fan

Bathroom Fan

Clothes Dryer

Kitchen Range Hood

or Draft Assisted

Gas Log Fireplace

Factory Minimum Maximum

75 25 225

75 20 140
200 80 400
850 100 1600

Appliance
#2

Appliance
#3

CFM

APPLIANCE #1

APPLIANCE #2
APPLIANCE #3
APPLIANCE #4

TABLE 4: Appliance Dial Ranges and Factory Settings

Appliance
#4

FIGURE 9: OPTIONAL FAN MONITORING SETTINGS

The appliance monitoring connection terminal block (See Figure 1, on page 4) is used for connecting up
to four (4) separate optional appliances (multiple bathroom exhaust fans, clothes dryer, range hood,
etc.) for monitoring or interacting with exhaust operations. Please note any appliance can be moni­tored if its air fl ow is within the appliance dial setting range. When appliances are active, the length
of time in operation and fl ow rate of the device are used to credit against the ventilation requirements.
Dwell time for appliance #1 and 2 is 2 hours maximum. Dwell time for appliance #3 and 4 is 4
hours maximum.The appliance monitoring features are based on the following equipment devices:

Settings

Appliance #1 – HRV/ERV or Bathroom Fan or Exhaust Fan Appliance
Appliance #2 – Bathroom Fan
Appliance #3 – Clothes Dryer or Central Vacuum
Appliance #4 – Kitchen Range Hood or Draft Assisted Gas Log Fireplaces

The four optional terminal input pairs are intended for a 24VAC signal (must have a common feed). Each
input pair is electrically isolated from the other pairs. Unused input pairs should be left unconnected. The
associated control setting does not matter if the input is not used. The optional inputs are not
required for FAVC to operate properly. Refer to Table 5 for additional information regarding normal and
optional operational conditions for Appliances 1 through 4.

CONNECTION Type NORMAL Operation OPTIONAL Operation

APPLIANCE #1

APPLIANCE #2
APPLIANCE #3

APPLIANCE #4

Bath Fan

or

HRV/ERV

Bath Fan Monitoring None

Clothes Dryer

or

Range Hood

Comercial Range Hood

or

Gas Fireplace

whenever appliance #1 runs.

Will run central fan with damper

open when Appliance #4 is on.

Monitoring:

(DIP 4 OFF)

Contributes to ventilation

Passive Make-UP Air:

(DIP 3 OFF)

Opens Damper whenever

Appliance #3 is on.

Monitoring

Active Make-Up Air:

Monitoring

Energy Saving Mode:

(DIP 4 ON)

Drives Appliance #1 Fan when additional

ventilation is required in lieu of Central Fan

Active Make-Up Air

(DIP 3 ON)

Turns on central fan & opens damper

whenever appliance #3 runs.

None

TABLE 5: Appliance Connection Type and Operational Condition

Page 13 of 36

P/N 780100700 07/18 Rev F

Appliance #1 input monitoring terminals are designated as A1 and A1C. The A1C terminal
should be connected to common 24VAC power. The control setting represents the air fl ow rate
of the appliance that is being monitored (set the CFM Appliance #1 air fl ow dial setting to
match appliance air fl ow rating or measured air fl ow rating). If the FAVC is set to energy saving
mode, the control setting represents the fl ow rate of exhaust appliance that is controlled by the
FAVC “E” terminals (set the CFM Appliance #1 air fl ow dial setting to match the exhaust fan,
bathroom fan or HRV/ERV device measured air fl ow rating). When FAVC is set to energy sav­ing mode, the FAVC will not control the central fan on the air handler unit but will power the “E”
terminals to operate a remote relay to turn ON/OFF the exhaust fan, bathroom fan or HRV/ERV
devices. The air fl ow range for appliance #1 is 25 to 225 CFM and is initially factory set at 75
CFM.

Appliance #2 input monitoring terminals are designated as A2 and A2C. The A2C terminal
should be connected to common 24VAC power. This input is typically used to monitor a bath­room fan or other suitable exhaust fan appliance. The control setting represents the air fl ow
rate of the appliance that is being monitored (set the CFM Appliance #2 air fl ow dial setting to
match appliance air fl ow rating or measured air fl ow rating). The Appliance #2 monitor setting
will only take effect if the signal to the A2, A2C terminals is active. This will be an additional ex­haust fl ow monitored and be added to the Appliance #1 air fl ow usage if present when the en­ergy conservation mode is enabled. If energy saving mode is disabled (OFF), the total air fl ow
usage that is monitored from appliance #1 and #2 will be credited against required ventilation
based on the continuous CFM setting. The air fl ow range for appliance #2 is 20 to 140 CFM and
is factory set at 75 CFM.

Appliance #3 input monitoring terminals are designated as A3 and A3C. The A3C terminal should
be connected to common 24VAC power. This input is typically used to monitor a clothes dryer or
other medium CFM suitable exhaust fan appliance. The control setting represents the air fl ow rate of
the appliance that is being monitored (set the CFM Appliance #3 air fl ow dial setting to match ap­pliance rating or measured air fl ow rating). The air fl ow range for appliance #3 is 80 to 400 CFM
and is factory set at 200 CFM. The input signal for appliance #3 is used for ventilation control by
the FAVC in two different modes depending on DIP Switch 3 position. This feature is shipped OFF
(DISABLED) from the factory. If the DIP Switch 3 is set to:

ON - The FAVC will directly control the central fan whenever appliance #3 input
terminal is energized. When active, appliance #3 will override the temperature and
humidity limits.
OFF - The FAVC will accumulate run time of exhausting appliance whenever appliance #3
input terminal is energized based on dial setting for CFM Appliance #3 and use this
information to decide if minimum ventilation requirements have been met or adjust
ventilation time-on duration on the next ventilation cycle.

Appliance #4 input monitoring terminals are designated as A4 and A4C. The A4C terminal
should be connected to common 24VAC power. This input is typically used to monitor a kitchen
range hood, draft assisted gas log fi replaces or other large CFM suitable exhaust fan appliance.
The control setting represents the air fl ow rate of the appliance that is being monitored (set the CFM
Appliance #4 air fl ow dial setting to match appliance rating or measured air fl ow rating). The air
fl ow range for appliance #4 is 100 to 1600 CFM and is factory set at 850 CFM. Whenever appli­ance #4 input terminal is energized, the FAVC “V” (ventilation device) and “E” (exhaust fan device)
output terminals are energized and the central fan is turned on. This will force fresh air ventilation
and air recirculation for as long as appliance #4 is active. The FAVC will calculate a dwell time
based on Appliance #4 CFM rate and length of operation of Appliance #4. When active, appliance
#4 will override the temperature and humidity limits.

P/N 780100700 07/18 Rev F

Page 14 of 36

5. MAKE-UP AIR OPTIONS - DIP Switch 3

The FAVC is equipped with two make-up air features for use
with high fl ow exhaust appliances such as kitchen range hoods,
clothes dryers, and draft assisted gas log fi re places. The primary
make-up air function is associated with appliance #4. When a signal is
present on appliance #4 terminals, (A4 and A4C), the fresh air
damper will open and the central fan will run. The secondary

FIGURE 10: DIP Switch3

make-up air function is associated with appliance #3. This feature is
confi gurable with dip switch 3. With the dip switch 3 set to off (de­fault), will set the appliance #3 in a passive ventilation mode, such that
only the fresh air damper will open when the appliance #3 is active. To
select the make-up air mode for appliance #3, set dip switch #3 to
on. When appliance #3 is active, the fresh air damper will open and
the central fan will run. Refer to Figure 10 and 11 to set dip switch 3.

DIP 3 FUNCTION

ON FAN CYCLES WITH

APPLIANCE #3 INPUT

OFF FAN DOES NOT CYCLE WITH

APPLIANCE #3 INPUT

FIGURE 11: DIP Switch 3 Fan-

Activity with Appliance #3

6. ENERGY SAVING OPTION - DIP Switch 4

Energy Saving Mode is a confi gurable feature designed to allow

the FAVC to control or not to control the central fan during a call for
ventilation when the thermostat is not in a heating or cooling mode
condition. If energy saving mode is ON (ENABLED) and the
thermostat requires a heating or cooling action, the CFM Heat Vent
and CFM Cool Vent dial rates for heating and cooling modes are
used in combination with CFM continuous dial rate to determine
if the HVAC has operated long enough to meet the ventilation
requirement. If the heat or cooling run time driven by the thermostat
does not meet the required ventilation run time for the heat/cooling
event, the FAVC will keep the fresh air damper open and activate
the auxiliary exhaust device once the central fan has shut down
due to the thermostat control call. In specifi c terms, the vent (V) and
auxiliary fan (E) terminals of the FAVC will remain active based
on the required time to meet ventilation requirements using the
Appliance #1 fl ow rate setting.

To ENABLE Energy Saving Mode, set DIP Switch 4 to ON (ENABLE) to allow the FAVC to not control the
central fan during a call for ventilation. In the ENABLE mode, the FAVC will independently energize the
vent (V) and auxiliary fan (E) terminals when fresh air ventilation is required; and the HVAC system is
not running. Refer to Figure 12 and Figure 13 for DIP Switch 4 setting to confi gure FAVC central fan
control during a call for ventilation function.

This is ideal for use with an ERV/HRV system or to remote control a bathroom fan or exhaust fan. The
FAVC will operate the central fan of the air handler under specifi c conditions, regardless if energy
saving mode is ON or OFF:

FIGURE 12:
Energy Saving DIP Switch 4

ENERGY SAVING MODE

DIP 4 FUNCTION

ON ENERGY SAVINGS MODE,

EXHAUST FAN CONTROL

OFF DISABLED

FIGURE 13: DIP Switch 4

Energy Saving Mode

Condition 1 If the thermostat has had no calls for heat or cooling with in a 4-hour time
period, the FAVC will cycle the central fan for one ventilation time period,

Condition 2 If appliance #3 has input monitoring event and DIP Switch 3 is set to
ON, the central fan will operate whenever the appliance #3 is turned on, or

Condition 3 If appliance #4 has an input monitoring event, the central fan will operate
whenever appliance #4 is turned on.

With the Energy Saving Mode OFF (DISABLED), the FAVC will turn ON the central fan and activate the
vent (V) terminal for all ventilation requirements even if the thermostat is idle or off.

Page 15 of 36

P/N 780100700 07/18 Rev F

7. INSTALLATION

7A. INSTALLATION LOCATIONS

7Ai. FAVC location

The Fresh Air Ventilation Controller (FAVC) has been designed to install directly to the return air
plenum of your HVAC system, refer to Figures 14 and 15 for additional installation information. The
FAVC can be installed on the wall in the return air stream as close to the return air vent of HVAC
system when the small room is designed to act as a return air plenum using the optional FAVC
mounting bracket (Field Controls P/N: 602600150), refer to Figure 16 for return air closet
installation information.

OPTIONAL INLINE HEATER
(REQUIRED FOR COLD
REGION ONLY)

FIGURE 14 - Attic/Horizontal Air Handler Installation

OPTIONAL INLINE HEATER
(REQUIRED FOR COLD
REGION ONLY)

FIGURE 15 - Basement/Vertical Air Handler Installation

P/N 780100700 07/18 Rev F

Page 16 of 36

INSIDE

FURNACE/

AIR

HANDLER

SUPPLY DUCT

WALL

FILTER/TRIO 1200/2000

FAVC ON

WALL

MOUNT

BRACKET

R/A VENT

FROM HOME

OPTIONAL INLINE HEATER
(REQUIRED FOR COLD
REGION ONLY)

FRESH AIR
INTAKE HOOD
W/SCREEN

FRESH AIR

FRESH

AIR

DAMPER

OUTDOOR
TEMPERATURE
SENSOR

OUTSIDE WALL

FIGURE 16 - Return Air Closet Installation

Page 17 of 36

P/N 780100700 07/18 Rev F

7Aii. FAVC Mounting

After a mounting location for controller has been selected, affi x the hole template provided with
FAVC installation kit, Figure 18 (dwg: 780101300) to return air plenum and mark the locations for
two mounting holes and sensor hole. Drill two 0.136” diameter holes in metal ductwork for securing the
controller with two #8 sheet metal screws. Drill a 1-1/2 inch diameter hole (or penetrate the ductwork
and cut a 1-1/2 inch square hole) in ductwork to allow the controller’s Humidity/Temperature Sensor to
sense actual return air duct environmental conditions. The Humidity/Temperature sensor extends out from
the back of the controller plastic case. Refer to Figure 17 for exploded view of FAVC unit mounting to
ductwork.

WARNING: The controller is provided with pre-installed gasket material around the sensor.
Do not install controller without gasket seal material installed.

SIDE VIEW

Ø 0.136”
DIA HOLES

Figure 17: FAVC Mounted Directly to Ductwork

FIGURE 18 - Example of Template for FAVC Mounting (NOT TO SCALE)

P/N 780100700 07/18 Rev F

Page 18 of 36

7Aiii. Intake Air Connection and Duct Installation

ASHRAE recommends that the fresh air intake be located at least 10 feet from any source of pollutants
such as auto exhaust, dryer exhaust, exhaust from any fuel-burning appliance, etc. Avoid installation
near odor sources such as garbage bins or barbecue grills. A minimum of 3 foot above ground is
recommended to avoid ingress of leaf litter, grass clippings, etc. Do not use a crawl space, basement
or attic as a source of intake air. Always be sure to comply with local building code requirements
regarding fresh air inlets.

Ductwork Specifi cation

• All fl exible ducts must meet UL safety standards for Class I air ducts and connectors.

• All ducting must be installed according to HVAC codes and standards.

• All duct connections should be sealed with UL181 foil tape or mastic to prevent leakage.

• Insulated duct of at least R-4 insulating value with a continuous vapor barrier must be used for the
intake duct. The vapor barrier must be sealed at both ends.

• Exterior intake should be installed above snow line or a minimum of 18” above ground level,
whichever is greater.

• Exterior intake hood must be weather resistant and must have a screen (1/4” openings) to
prevent debris, animals and insects from entering ductwork.

Page 19 of 36

P/N 780100700 07/18 Rev F

7Aiv. Fresh Air Damper (FAD) or HRV/ERV location

The fresh air damper (FAD) can be located anywhere in the fresh air inlet duct. Minimize the
length of the inlet duct to improve airfl ow and improve system effi cency. It is recommended that the
damper be as close to the return air plenum as possible, and that the inlet duct connect to the
return plenum upstream of the system fi lter, and downstream of any duct-mounted sensors.

The HRV/ERV unit should be installed in an area where the air is tempered to avoid freezing of the
condensate line. The contractor should install the unit in an area that is very accessible to allow the
homeowner easy access for maintenance.

It is very important to install an electric receptacle (115V) near the HVR/ERV, a seperate circuit
breaker is also recommended. You should have access to a condensate drain near the HRV/ERV to

avoid the use of condensate pump.
As a minimum, double the continuous ventilation fl ow rate for sizing the HRV/ERV product. Use the

HRV/ERV air fl ow rate as the CFM HEAT and CFM COOL dial setting one the FAVC unit.

FIGURE 19 - Fresh Air Damper (FAD) and Fresh Air Intake location

6” - 10”

FAVC

MINIMUM

FIGURE 20 - ERV/HRV and Fresh Air Intake location

P/N 780100700 07/18 Rev F

Page 20 of 36

7B. WIRING AND CONNECTIONS

This area is used to fi ne tune actual operating conditions by manually setting DIALS to match actual
appliance or operational condition to provide fresh air ventilation all year round to meet ASHRAE 62.2
Ventilation Standards while providing energy conservation, better indoor air quality and keeping
comfort in mind. Refer to TABLE 1 for Air Flow Dial ranges and Factory Settings.

The fi rst three dial settings (CFM Continuous, CFM Cool Vent and CFM Heat Vent) on the FAVC
are used for computing the continuous ventilation run time and dwell time based on ASHRAE 62.2
Standard. The cycle rate is fi xed at 30 minutes. Refer to Figure 2 for ventilation only required dials.
Adjust the setting on the FAVC for the CFM Continuous dial to match the continuous ventilation rate
for your dwelling per VENTILATION SETTINGS section, starting on page 5. The CFM Continuous

rate is initially factory set at 100 CFM.

The Cool Vent and Heat Vent dial settings allows for two different settings if the air handler is equipped
with an ECM blower that may operate at different fan speeds for cooling and for heating modes.
If the system is a heat pump, the FAVC will automatically detect if the system is operating in cooling
or heating based on the outdoor air temperature and the return air temperature. Each heating and
cooling cycle is monitored; minimum and maximum temperatures are also recorded to anticipate
the next call for heating or cooling. Conventional systems or heat pumps with auxiliary heat, the W
terminal will indicate if the system is in heating mode of operation. The CFM Cool Vent and CFM Heat

Vent rates are initially factory set at 400 CFM each.

Refer to Wiring Diagrams 1 and 2 for basic ventilation wire requirements using Fresh Air Damper
or HRV/ERV devices. Refer to wiring diagrams 3 and 4 when adding optional appliance monitoring

and/or control features.

7Bi. Ventilation Control Connectors

The FAVC has two isolated outputs for control of a fresh air damper and a remote relay to
control an exhaust fan (auxiliary fan for balanced ventilation or a bath fan). The Vent and
Exhaust Fan terminal block is in the VENT AND EXHAUST VENTILATION CONTROL CONNECTION
area of the FAVC as shown in Figure 1 and Figure 21. The terminals for the ventilation
damper are labeled with a V; and the terminals for the exhaust fan are labeled with an E. Both sets of
terminals are compatible with all types of ERV/HRV systems that use dry contact or DC signals. The
V terminals can be used to activate an ERV/HRV unit if placed into intermittent fan operation. Some
ERV/HRV units can be confi gured to operate as two speed where the low speed will run continuously
and the high speed is activated by dry contacts. If the fl ow rate of the low speed operation is measured,
it can be subtracted from the required continuous cfm rate on the primary control. The high-speed
rating can be used for both Cool and Heat vent CFM values if a fresh air damper is not used. Both,
the V and E terminals are isolated from the 24 VAC supply (dry contact form), one terminal of the
pair must be connected to the R (24VAC) power side of the supply transformer to control the fresh air
damper or the remote relay to operate a fan. Both V and E terminals will be active during
ventilation calls.

FIGURE 21: Vent and Exhaust Control Connections (Rotated 90°)

WARNING: Under no circumstances shall line voltage be wired to these terminals. This product
is rated for Class 2 low voltage use. Ratings: 24VAC (3A max load). Dry
contact compliant, and suitable for up to 24VDC (3A max load).

Page 21 of 36

P/N 780100700 07/18 Rev F

7Bii. Thermostat and Air Handler Connections

The FAVC has 5 terminals to interface between the thermostat and air handler. The Thermostat and
Air Handler terminal block is in the THERMOSTAT AND AIR HANDLER CONNECTION region of the
FAVC as shown in Figure 1 and Figure 22. The terminal designations are as follows:

• C is the common

• W is the heat signal from the thermostat

• GT is the fan signal from the thermostat

• GF is the fan signal to the Furnace or air handler

• R is the 24VAC hot

The FAVC does not need to be connected to the Y (compressor or
cooling) as the GT (thermostat fan signal) will suffi ce for all
applications including heat pumps. There may be functions
that do not use the fan signal such as heating with gas or oil
furnace systems. Both the GT and W terminals are used to monitor
thermostat activity. Note: The GT signal is passed to the GF

terminal though relay contacts when the FAVC is idle or not in
control of the central fan. All 5 of the terminals are sourced from

the air handler or furnace require 24VAC power supply.

Thermostat and Air Handler

Terminal on FAVC (Rotated 90°)

FIGURE 22:

P/N 780100700 07/18 Rev F

Page 22 of 36

P/N: 780300901

Page 23 of 36

DIAGRAM 1: Conventional Wiring Diagram

(Thermostat, Air Handler, FAVC, ODT Sensor and Fresh Air Damper)

P/N 780100700 07/18 Rev F

P/N: 780300902

P/N 780100700 07/18 Rev F

Page 24 of 36

DIAGRAM 2: Conventional Wiring Diagram

(Thermostat, Air Handler, FAVC, ODT Sensor and HRV/ERV Device)

7Biii. Outdoor Temperature Sensor (ODT) Connection

The FAVC uses an Outdoor Temperature (ODT) Sensor to monitor
ventilation temperatures passing into the ventilation duct from the
outside of the dwelling. The Outdoor Temperature Sensor terminal
block is in the OUTDOOR TEMPERATURE SENSOR CONNECTION
area of the FAVC as shown in Figure 1 and Figure 23. Terminals are
marked with an “S”. The ODT sensor is supplied with the FAVC and
MUST BE INSTALLED for the FAVC to operate properly. The best loca­tion to mount the ODT sensor is next to the fresh air damper on the
side wall of the duct. Location on duct should be between the fresh
air damper and the outside vent hood or between inline duct heater
and outside vent hood in cold region applications (Refer to Figures
14, 15 and 16). Refer to Figure 20 with HRV/ERV equipment for
ODT sensor location. Drill a 1/4 inch diameter hole and insert the sensor
probe into the vent duct and seal with metal duct tape. The ODT sensor
is not polarized therefore, it does not matter which wire is connected to
either “S” terminals.

Outdoor Temperature

Sensor Connection

FIGURE 23:

(Rotated 90°)

7Biv. Outdoor Temperature Sensor LED Status

The FAVC will provide status via a three color (Red, Green or
Blue) LED to indicate outside air temperature meets ventilation

requirements or if ventilation will be limited due to temperature or
humidity levels. Refer to FIGURE 24, Green indicates outside air
meets ventilation requirements without restrictions. Red indicates the
outside temperature is greater than or equal to 90°F, too hot for
ventilation and may be restricted to 25% or prohibited when outside
temperature reaches 100°F. Blue indicates the outside air
temperature is less than 40°F, is too cold for ventilation and may
require heating to be active, restricted or prohibited. The LED may turn blue in color if the plenum low
temperature is reached. If the LED is off, this would indicate there is no power or there is a fault in the
sensor or sensor wire connection. The LED may be off for fi rst 15 seconds after power is applied to FAVC.

FIGURE 24: Outdoor

Temperature (ODT) LED

Page 25 of 36

P/N 780100700 07/18 Rev F

7Bv. Appliance Monitoring Connections
Optional Control Functions

The FAVC can combine an optional control function to activate multiple exhausting fan devices which
are monitored for ventilation accumulation runtime across Appliances #1 and 2 terminals. The
optional output control terminals are designated as pairs and are intended for a 24VAC signal
(must have a common feed). For device control purposes, always use the exhaust device terminals
(E,E) for wire connections and install a separate 120/24VAC transformer to supply isolated
24VAC control power. A separate 24VAC relay (AUBE RC840) should be used in the power
circuit (120 VAC) to drive the exhausting fan device.

Refer to section 4 for the settings for Appliance Monitoring

The terminal block is used for connecting up to four (4) separate optional appliances (multiple bathroom
exhaust fans, clothes dryer, range hood, etc.) for either tracking or monitoring of exhaust operations.
Please note any appliance can be monitored if its air fl ow is within the appliance dial setting range.
The appliance monitoring features are based on the following equipment devices:

Appliance #1 – HRV/ERV or Bathroom Fan or Exhaust Fan Appliance
Appliance #2 – Bathroom Fan
Appliance #3 – Clothes Dryer or Central Vacuum
Appliance #4 – Kitchen Range Hood or Draft Assisted Gas Log Fireplaces

The FAVC can combine an optional control function to activate multiple exhausting fan devices which
are monitored for ventilation accumulation runtime across Appliances #1 and 2 terminals. The
optional output control terminals are designated as pairs and are intended for a 24VAC signal (must
have a common feed). For device control purposes, always use the exhaust device terminals (E,E)
for wire connections and install a separate 120/24VAC transformer to supply isolated 24VAC control
power. A separate 24VAC relay (AUBE RC840) should be used in the power circuit (120 VAC) to drive
the exhausting fan device.

Refer to sections 5 & 6 for more information about Make Up Air and Energy Saving options.
Additional features may be engaged using Dip Switches 3 & 4 as referenced in sections 5 & 6.

P/N 780100700 07/18 Rev F

Page 26 of 36

P/N: 780300903

NOTE: HVAC, Thermostat, Outdoor Sensor Wiring and FAD/HRV/ERV

Connections not shown for simplicity.

Page 27 of 36

DIAGRAM 3: Appliances 1 thru 4 Monitoring Connections using Current or Pressure Sensors

P/N 780100700 07/18 Rev F

P/N: 780300904

NOTE: HVAC, Thermostat, Outdoor Sensor Wiring and FAD/HRV/ERV

Connections not shown for simplicity.

P/N 780100700 07/18 Rev F

DIAGRAM 4: Control and Monitoring Appliances using Current or Pressure Sensors and External Aube Relay

Page 28 of 36

8. MAINTENANCE AND TROUBLESHOOTING

Follow individual exhaust fan device manufacturer’s troubleshooting and maintenance information.

There is no routine maintenance required for the FAVC (controller) other than making sure the wires
connected to the FAVC terminals are secure and the screws holding the unit to ductwork is tight.

Field Controls Technical Support is available Monday-Friday from 8:00 am to 5:00 pm (EST) at

800.742.8368 or by email at fi eldtec@fi eldcontrols.com for further assistance. To reprint a copy of
the latest revision of this manual, visit www.fi eldcontrols.com to download.

SYMPTOM TROUBLESHOOTING PROCEDURE

Central fan turns on unexpectedly If ventilation requirement has not been met, the FAVC will

activate the central fan. This is normal operation.

The fresh air damper does not open
during call for ventilation.

FAVC controller LED is:
Green

Blue

Red

No Color

ODT Sensor

100°F

80°F

60°F

40°F

20°F

OHM Measurement

5861

9116

13926

26207

46673

• Damper is not plugged in or properly wired. Check
connector and wiring connections.

• Outdoor temperature is outside the operating limit
temperatures for fresh air ventilation

• Indoor RH is above humidity limits for fresh air
ventilation

Green LED indicates outside air meets ventilation
requirements without restrictions. This is normal, system
will function normally.

Blue LED indicates the outside air temperature or return air
plenum air temperature is less than 40°F. In this condition,
fresh air ventilation is prohibited.

Red LED indicates the outdoor air temperature is greater
or equal to 90°F and may restrict ventilation to 25%. If
temperature rises to 100°F, fresh air ventilation is
prohibited.

No color LED indicates no power 24VAC power or
common from HVAC system or faulty ODT sensor:

1. Check 24VAC power from HVAC/thermostat.

2. Check wire connections to/from HVAC/Thermostat to
FAVC at terminals.

3. ODT Sensor - Check wire terminal connections. Check
wire nut connections. Disconnect ODT wires from S
terminals and perform ohmmeter check on based on
temperature vs ohm readings. (Chart to left) If ohm
readings do not match temperature scale, replace ODT1
sensor.

Central fan does not turn on during
fresh air damper ventilation and appli­ance operation

The FAVC DIP Switch 4 is set to ON (Energy Saving Mode).
The controller will turn on/off appliances and fresh air
damper to meet ventilation requirements. This is normal.

Page 29 of 36

P/N 780100700 07/18 Rev F

9. SPARE PARTS AND OPTIONAL ACCESSORIES

MODEL DESCRIPTION FC P/N

FAD-4 4” FRESH AIR DAMPER 46590504
FAD-5 5” FRESH AIR DAMPER 46590505
FAD-6 6” FRESH AIR DAMPER 46590506
FAD-7 6” FRESH AIR DAMPER 46590507

FAD-8 8” FRESH AIR DAMPER 46590508
FAD-10 10” FRESH AIR DAMPER 46590510
R2-VH4 4” OUTDOOR VENT HOOD FOR HRV/ERV 60510010070
R2-VH5 5” OUTDOOR VENT HOOD FOR HRV/ERV 60510010071

R2-VH6 6” OUTDOOR VENT HOOD FOR HRV/ERV 60510010072

IAH-4 INTAKE AIR HOOD 4” FOR FAD 46292000

IAH-6 INTAKE AIR HOOD 6” FOR FAD 46293000

ODT1 OUTDOOR TEMPERATURE SENSOR 620000102

C-SENSOR CURRENT SENSOR, 24VAC 46676600

P-SENSOR PRESSURE SENSOR, 24VAC 46679400

40XFMR TRANSFORMER, UV-16/24 PLUG-IN 46524800
50XFMR TRANSFORMER, 24VAC 50VA 46638800

24VAC RELAY AUBE RC840, 24VAC RELAY 5109000200

FC80HRV FC80 HRV - HEAT RECOVERY VENTILATOR 60510004080
FC150HRV FC150 HRV - HEAT RECOVERY VENTILATOR 60510004150
FC200HRV FC200 HRV - HEAT RECOVERY VENTILATOR 60510004200

FC80ERV FC80 ERV - ENERGY RECOVERY VENTILATOR 60510005080
FC150ERV FC150 ERV - ENERGY RECOVERY VENTILATOR 60510005150
FC200HRV FC200 ERV - ENERGY RECOVERY VENTILATOR 60510005200

FWMB ASSY, FAVC WALL MOUNT BRACKET 602600150

P/N 780100700 07/18 Rev F

Page 30 of 36

10. SIZING OF FRESH AIR DAMPER AND HRV/ERV

10A. HOW TO SIZE A FRESH AIR DAMPER

Select the size of the Fresh Air Damper (FAD) based on the continuous ventilation CFM requirement
multiplied by 3 and adjusted for the actual fresh air ductwork installation parameters to allow the
FAVC system operate 10 minutes on every 30 minutes.

There are two methods available to Size the Fresh Air Duct: Estimated and Design.

Estimated Method for FAD Sizing: Use Tables 6A and 6B to select fresh air damper air fl ow rate in CFM.
Table 6A shows estimated FAD air fl ow rates based on smooth wall fresh air pipe ductwork at various
lengths. Table 6B shows estimated FAD air fl ow rates based on Flex Duct fresh air pipe ductwork at
various lengths. Short Run Length section is for short simple installations with no elbows or reducing
fi ttings installed with a total of 10 foot equivalent duct length or less. Medium Run Length section is for
8-19 foot duct runs with 1 or less elbows or reducing fi ttings installed with a total of 30 foot equivalent
duct length or less. Long Run Length section is for 15-28 foot duct runs with 2 or less elbows or reducing
fi ttings installed with a total of 30 foot equivalent duct length or less.

Table 6A: FAD Damper Size Air Flow in CFM for Smooth Wall Pipe

Table 6B: FAD Damper Size Air Flow in CFM based on Flex Wall Duct

Design Method for FAD Sizing: The design method uses the combination of equivalent duct length
based on actual ducting design and static pressure measurement at inlet side of fresh air ducting with
air handler running in cooling and/or heating modes. Figure 15, on page 15, shows a typical FAD
installation in a basement confi guration. Tables 2A and 2B are used to select the continuous ventilation
CFM requirement according to size of home (in square foot), number of bedrooms and applicable
ASHRAE62.2 code year. Tables 7A and 7B are used to calculate equivalent feet for vent piping and
reducer/increaser fi ttings. Table 8 is used to verify your fresh air damper air fl ow selection based on
actual negative return air static pressure (inches WC) measurement taken at the intake of fresh air
ductwork.

Page 31 of 36

P/N 780100700 07/18 Rev F

Design Method:

Step 1: Select the continuous ventilation CFM fi gure according to size of home (in square
feet), number of bedrooms and applicable ASHRAE62.2 code year using Tables 2A
and 2B on page 6.

Step 2: Measure static pressure at the return intake (in Inches WC).
Step 3: Calculate equivalent feet of duct between fresh air inlet and the central fan.
i. Determine the total equivalent feet for each type of fi tting used in the system
from Tables 7A and 7B.
ii. Calculate the total feet for the straight lengths of pipe.
iii. Add the equivalent feet of the fi ttings to the total amount of straight feet pipe.

This fi gure becomes the total equivalent feet of duct length.
Step 4: Use Table 8 to select fresh air damper size based on measuring static pressure at the

return intake, multiple the continuous ventilation CFM value by 3 for fresh air damper
CFM and calculated total equivalent duct length. Find the static pressure column, match
the FAD CFM rate equal to or greater than 3 times the continuous ventilation rate
required. The correct damper and intake hood size is listed to the left on Table 8.
When in doubt, use the next larger damper.

Table 7A: Equivalent Feet for Vent Pipe Fittings

Table 7B: Equivalent Feet for a Reducer/Increaser Pipe Fitting

It is recommended that the damper be as close to the return air plenum and the FAVC as possible
while maintaining the minimum separate distance of 20 inches, and that the inlet duct connection
to the return air plenum upstream of the system fi lter and downstream of any duct-mounted sensors.

P/N 780100700 07/18 Rev F

Page 32 of 36

Table 8: Fresh Air Damper Sizing Chart

Example of Fresh Air Damper Sizing using the Design Method:
Step 1: 1500 sq. ft. home, 3 bedrooms, ASHRAE62.2-2010 standard. From Table

2A, continuous ventilation required is 45 CFM. For damper sizing multiply
continuous ventilation value by 3 equates to 135 CFM for fresh air damper
size.

Step 2: Static pressure in the return is 0.15 inches WC (measured).
Step 3: Ductwork system design consists of:
i. Two 6” diameter 45° Elbow (10 equivalent feet),
ii. 10 feet of straight 6” smooth diameter ductwork (10 equivalent feet).
iii. The system has 20 equivalent feet of smooth duct (10 + 10 = 20)
Step 4: The 6 inch Fresh Air Damper delivers 136 CFM in smooth duct at 30
equivalent feet and would be the appropriate damper for this system.

Refer to Field Controls Ventilation Reference Guide for additional information on proper sizing of Fresh
Air Damper and ductwork.

10B. HOW TO SIZE AN HRV/ERV

As a minimum, double the continuous ventilation fl ow rate for sizing the HRV/ERV product.
Use the HRV/ERV air fl ow rate as the CFM HEAT and CFM COOL dial setting on the FAVC unit.

Page 33 of 36

P/N 780100700 07/18 Rev F

INSTALLATION NOTES

FILL-IN CUSTOM SETTINGS

FACTORY SETTINGS

CFM Continuous Ventilation Rate: _______________ CFM

CFM Cool Vent: ______________________________ CFM

CFM Heat Vent: ______________________________ CFM

CFM Appliance #1: __________________________ CFM

CFM Appliance #2: __________________________ CFM

CFM Appliance #3: __________________________ CFM

CFM Appliance #4: __________________________ CFM

100

400

400

75

75

200

850

Damper Size: ________________________________ Inches or

HRV Model: _________________________________ CFM: ___________ or

ERV Model: __________________________________ CFM: ___________

DIP Switch (SW1) Settings (Circle Setting)

Climate Setting (Switches1 & 2): Normal, Cold, Hot or Disabled

Fan Activity w/ Appliance #3 (Switch 3): ON or OFF

Energy Save (Switch 4): ON or OFF

NORMAL

OFF

OFF

P/N 780100700 07/18 Rev F

Page 34 of 36

(THIS PAGE LEFT INTENTIONALLY BLANK)

Page 35 of 36

P/N 780100700 07/18 Rev F

This manual may be downloaded and printed from the Field Controls website (www.fi eldcontrols.com)

This manual may be downloaded and printed from the Field Controls website (www.fi eldcontrols.com)

WARRANTY

For warranty information about this or any Field Controls product, visit:

www.fi eldcontrols.com

Field Controls Technical Support

1.800.742.8368

fi eldtec@fi eldcontrols.com

WARRANTY

For warranty information about this or any Field Controls product, visit:

www.fi eldcontrols.com

Field Controls Technical Support

1.800.742.8368

fi eldtec@fi eldcontrols.com

9154 Stellar Ct
Corona, CA 92883

© Field Controls, LLC P/N 780100700 07/18 Rev F

Phone: [phone] • Fax: [phone]

www.fieldcontrols.com

2630 Airport Road

Kinston, NC 28504