Page 1
INSTALLATION INSTRUCTIONS
Full Flow Economizer
with Exhaust for Building Applications
(To Be Used with Field-Installed DDC Controls)
Model: ECON-NC5
For Use with Bard Single Stage Wall Mount
Air Conditioner and Heat Pump Models:
W42AC, W48AC, W60AC, W72AC
W42HC, W48HC, W60HC
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual: 2100-708A
Supersedes: 2100-708
Date: 9-16-19
Page 1 of 17
Page 2
CONTENTS
General Information ...............................................3
Economizer Model Nomenclature ...........................
Unpacking .......................................................... 3
General ..............................................................3
Ecomomizer Features ........................................... 3
Description .........................................................3
Models ...............................................................3
Installation of Field-Installed ECON-NC5 ...........4
Basic Installation .................................................4
Blade Adjustment for Desired Ventilation Air ..........9
3
Figures
Figure 1 Disconnect Power ................................ 4
Figure 2 Remove Side Grilles ............................. 4
Figure 3 Remove Blower Door and Control Panel
Cover .................................................. 4
Figure 4 Remove Blank Off Plates (Both Sides) .... 5
Figure 5 Remove Exhaust Blank Off Plate ........... 5
Figure 6 Remove Air Filters and Low Voltage
Control Panel Cover .............................. 5
Figure 7 Install Outdoor Air Sensor ..................... 5
Figure 8 Route Sensor Wires and Fasten to
Motor Mount ........................................ 6
Figure 9 Remove Wire Channel Covers ................ 6
Figure 10 Install 3000-1627 Wire Harness ........... 6
Figure 11 Route Wires into Wire Channel and
Connect to Wire Harness ....................... 6
Figure 12 Pull Wire into Exhaust Area and
Fasten with Ties ................................... 7
Figure 13 Install Economizer ............................... 7
Figure 14 Control Plug Centered in Plug Access
Opening .............................................. 7
Figure 15 Connect Economizer Power Plug to
Control Panel Plug ............................... 7
Figure 16 Release the Exhaust Blade .................... 8
Figure 17 Exhaust Blade and Latch ...................... 8
Figure 18 Install Intake Sealing Frame and
Lower Block Off Plates ......................... 8
Figure 19 Install Mist Filters ................................ 8
Figure 20 Install Bug Screen and Gaskets ............. 9
Figure 21 Programmable Thermostat Connections
for ECON-NC5 with Air Conditioners .... 10
Figure 22 Programmable Thermostat Connections
for ECON-NC5 with Heat Pumps ......... 11
Figure 23 Non-Programmable Thermostat
Connections for ECON-NC5 with
Air Conditioners ................................. 12
Figure 24 Non-Programmable Thermostat
Connections for ECON-NC5 with
Heat Pumps ...................................... 13
Figure 25 Call for Ventilation With or Without
Compressor Operation ........................ 16
Figure 26 Call for Compressor or Fan Only with
Ventilation Off ................................... 16
Figure 27 Wiring Diagram .................................. 17
Manual 2100-708A
Page 2 of 17
Graphs
Graph 1 W42AC ECON-E & WD Ventilation
Delivery .............................................. 14
Graph 2 W48AC ECON-E & WD Ventilation
Delivery .............................................. 14
Graph 3 W60AC ECON-E & WD Ventilation
Delivery .............................................. 15
Graph 4 W72AC ECON-E & WD Ventilation
Delivery .............................................. 15
Page 3
Economizer with Exhaust Model Nomenclature
ECON – NC 5
Economizer
NC – No Control
Chassis Size
5 – 5 Ton Models
GENERAL INFORMATION
Unpacking
Upon receipt of the equipment be sure to compare the
model number found on the shipping label with the
accessory identification information on the ordering and
shipping document to verify that the correct accessory
has been shipped.
Inspect the carton housing of each economizer as it is
received, and before signing the freight bill, verify that
all items have been received and that there is no visible
damage (check parts list below). Note any shortages or
damage on all copies of the freight bill. The receiving
party must contact the last carrier immediately,
preferably in writing, requesting inspection by the
carrier’s agent. Concealed damage not discovered until
after loading must be reported to the carrier within 15
days of its receipt.
General
The economizer should only be installed by a trained
heating and air conditioning technician. These
instructions serve as a guide to the technician installing
the economizer package. They are not intended as a
step-by-step procedure with which the mechanically
inclined owner can install the package.
The economizer is shipped in one carton which
contains the electrical harness, miscellaneous hardware
and installation instructions.
Economizer kit includes:
(1) ECON-NC5 ventilator
(1) 910-2017 sensor assembly
(1) 3000-1627 wire assembly
(2) 7003-084 mist filters
(1) 7003-083 exhaust bug screen
(2) 1913-002-0808 8-1/2" foam strips
(4) 1913-002-0708 7-1/2" foam strips
(2) 539-405 intake sealing frames
(2) 543-223 lower block off plates
(12) #10-16x1/2 screws
(4) #8-18x3/8 pan head screws
(1) 2100-708 installation instructions
Economizer Features
• One piece construction.
• Exhaust air damper – built in with positive closed
position. Provides exhaust air capability to prevent
pressurization of tight buildings.
• Actuator motor – 24 volt, power open, spring return
with built in torque limiting switch.
Description
ECON-NC economizers are designed to be used
with the wall mount series air conditioners and
heat pumps, shown in Table 1, equipped with low
ambient controls and field-installed controller. They
are electromechanical economizer systems designed
to provide “free” cooling where the outdoor air
temperature is cool enough to provide the needed
cooling without running the compressor, or in addition
to the compressor.
When cooling is required, the system automatically
takes advantage of cold outdoor air when available and
uses it for first stage cooling. This then reduces the
need to run the air conditioning compressor providing
lower operating costs and increasing the service life
of the equipment. If the outdoor air temperature is
too warm to be sufficient for cooling, the dry bulb
outdoor air temperature sensor detects the condition
and should automatically close the outdoor air intake/
exhaust damper, open the return air damper and switch
to compressor-only operation.
Models
When installed in the models listed on the front page,
the ECON-NC5 provides built-in exhaust provisions.
When the damper blade opens to bring fresh air in, the
damper also opens an exhaust relief. The exhaust air
will flow into the condenser section of the unit. The
condenser fan will help draw exhaust air out when it
is operating with compressor in cooling or heat pump
mode.
Manual 2100-708A
Page 3 of 17
Page 4
INSTALLATION OF FIELD-INSTALLED ECON-NC5
Basic Installation
!
WARNING
Electrical shock hazard.
Disconnect remote electrical power supply
or supplies before servicing.
Failure to do so could result in electric
shock or death.
!
WARNING
Exposed moving parts.
Disconnect electrical power before
servicing.
Failure to do so could result in severe
injury or amputation.
!
CAUTION
Cut hazard.
Wear gloves to avoid contact with sharp
edges.
Failure to do so could result in personal injury.
Remove both side grilles (see FIgure 2).
FIGURE 2
Remove Side Grilles
Side Grille
Remove upper blower door, outer control panel cover
and front (lower) condenser grille (see Figure 3).
FIGURE 3
Remove Blower Door, Outer Control Panel Cover
and Condenser Grille
Upper Blower Door
Disconnect all power to unit (see Figure 1).
FIGURE 1
Disconnect Power
Disconnect
Access Door
Manual 2100-708A
Page 4 of 17
Outer
Control Panel
Cover
Front (Lower)
Condenser Grill
Page 5
Remove blank off plates (both sides) and discard (see
Figure 4). Retain all screws for use with new vent.
FIGURE 4
Remove Blank Off Plates (Both Sides)
Remove both air filters and the low voltage inner control
panel cover (see Figure 6). Remove left filter first then
slide right filter to the left to remove.
FIGURE 6
Remove AIr Filters and Low Voltage
Control Panel Cover
Air Filters (2)
Blank Off Plate
Remove exhaust blank off plate through return or
through side intake openings and discard (see Figure 5).
FIGURE 5
Remove Exhaust Blank Off Plate
Exhaust Partition
Exhaust Blank Off
Plate
Low Voltage Inner
Control Panel Cover
Install the 8301-066 outdoor air sensor as shown in
Figure 7 using the holes provided with two (2) #1016x1/2 screws. View shown from left side.
FIGURE 7
Install Outdoor Air Sensor
Outdoor Air Sensor
Manual 2100-708A
Page 5 of 17
Page 6
Route the sensor wires over the top of the outdoor fan
motor and up through the condenser partition bushing.
Fasten the wires to the motor mount as shown in Figure
8 using (4) 7950-004 ladder ties provided.
FIGURE 8
Route Sensor Wires and Fasten to Motor Mount
Remove wire channel covers (see Figure 9).
FIGURE 9
Remove Wire Channel Covers
Install the 3000-1627 wire harness: The 4 pin connector
snaps into the back of the control panel for the
economizer to plug into, the 12 pin connector plugs into
the low voltage box and the orange wires run in the wire
channel and plug onto the sensor wires. See Figure 10.
FIGURE 10
Install 3000-1627 Wire Harness
4 Pin Connector
12 Pin Connector
Route the orange sensor wires up through the lower
control panel bushing and into the wire channel
(see Figure 11). Plug the wires into the 3000-1627
wire harness that plugs into the 12 pin low voltage
connector.
Wire Channel
Covers
FIGURE 11
Route Wires into Wire Channel and Connect to
Wire Harness
Manual 2100-708A
Page 6 of 17
Page 7
Pull the excess sensor wire down into the exhaust area
and fasten with two (2) 7950-004 ladder ties.
FIGURE 12
Pull Wire into Exhaust Area and Fasten with Ties
Before installing, remove economizer from packaging
and verify there is no damage. Install the economizer as
shown in Figure 13.
Set economizer on the exhaust partition (see Figure 5
on page 5) and slide in until flush with the side of the
wall mount. Economizer can be installed from either
side.
FIGURE 13
Install Economizer
When the economizer is fully installed, the control plug
should be centered in the plug access opening on the
front panel of the economizer as shown in Figure 14.
FIGURE 14
Control Plug Centered in Plug Access Opening
From the front, through the filter opening, plug the
economizer power plug into the control panel plug (see
Figure 15).
IMPORTANT: Sharp edges--PPE required.
FIGURE 15
Connect Economizer Power Plug to
Control Panel Plug
Manual 2100-708A
Page 7 of 17
Page 8
The ECON-NC5 exhaust blade is fixed in the shipping
position by the latch located on the bottom of the blade
(see Figure 16). Access can be made through the return
air opening or through the opening under the economizer.
Turning the latch 1/4 turn will release the blade.
FIGURE 16
Release the Exhaust Blade
Install the 539-405 intake sealing frame and the 543223 lower block off plates (both sides) as shown in Figure
18. Install two (2) 1913-002-0708 7-1/2" foam gaskets
below the intake sealing frame (both sides).
FIGURE 18
Install Intake Sealing Frame and
Lower Block Off Plates
Intake Sealing
Frame
Lower Block
Off Plate
Make sure the blade seats correctly over the exhaust
opening and that the latch is as shown in Figure 17.
FIGURE 17
Exhaust Blade and Latch
Install Gaskets Here
Bend the two (2) sheet metal tabs in the condenser
partition up to hold the bottom of the mist eliminator
in place.
Install 7003-084 mist filters on both sides (see Figure
19). Then re-install the side grilles removed earlier.
FIGURE 19
Install Mist Filters
Mist Filter
Manual 2100-708A
Page 8 of 17
Page 9
Bend the two (2) sheet metal tabs in the condenser
partition up to hold the bottom of the bug screen in
place.
Install two (2) 1913-002-0808 8-1/2" foam gaskets to
sides of cabinet (see Figure 20). Install the 7003-083
exhaust bug screen. Re-install front lower (condenser)
grille.
FIGURE 20
Install Bug Screen and Gaskets
Foam Gaskets
Exhaust Bug
Screen
Restore power to unit.
Refer to airflow charts on pages 14 and 15 for fresh air
CFM vs. voltage input to economizer.
Blade Adjustment for Desired
Ventilator Air
The amount of ventilation air supplied by the
economizer is dependant on four factors.
1. Return air duct static pressure drop.
2. Supply air duct static pressure drop.
3. Indoor blower motor speed.
4. Damper blade open position setting.
Refer to the appropriate graph on pages 14 and 15 to
determine the blade setting.
Manual 2100-708A
Page 9 of 17
Page 10
Completestat
Model #CS9B-THO or
Model #CS9BE-THO
FIGURE 21
Programmable Thermostat Connections for ECON-NC5 with Air Conditioners
SC
SC
SC
24V
COM
G
Y1 Y2 O/B L DA GND
W2
W1/E
6
Thermostat
Bard #8403-060
Unit Low
Voltage
Term. Strip
1
12-Pin
Vent Plug
Factory installed jumper. Removejumper andconnect
1
to N.C fire alarm circuitif emergency shutdown required.
Wire not needed below15KW.2
Wire required for dehumidification modelsonly.
3
4
Do not connect "A" from thermostat ifoptional CO2controller is used
0-10 VDC modulating C02control signal formodulating ventilation
5
control (optional for ECON only- see vent instruction manuals)
6
9
23 5 7
ALL VENT OPTIONS PLUG IN HERE
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
B/W1
119
2
W1/E
2
7
W2C GRT Y1 Y2
W3
A
LO/BY2Y1R GC W2
4
L DA 3
Change model configuration from heat pump to heat/cool.Must beconfigured to programmable
and fan set to be programmed fan for the "A"output to function duringscheduled occupied
6
periods. Must be configured formulti-stage for Y1output to beactive 1st stage cooling. For
dehumidification, must be configured for "No Economizer" for YO/D tobe active for humidity
control.
7
Install jumper for 1 stageelectric heaton unitswith less than15KW
Do not add these wiresif settingup for modulating control. See note 7.
8
Factory installed jumper. Removejumper to activateBalanced Climate
9
A 2-stage thermostat is recommended forBalanced Climatemode.
4
YO/D
3
5
Optional CO2 Controller
3
65421R
4
1012
Bard Part#8403-067
1
2
3
4
5
6
8
™
24VAC
CO2 OUT
TEMP-OUT
mode.
MIS-3974
A
Manual 2100-708A
Page 10 of 17
Page 11
Completestat
Model #CS9B-THO or
Model #CS9BE-THO
6
Thermostat
Bard #8403-060
FIGURE 22
Programmable Thermostat Connections for ECON-NC5 with Heat Pumps
SC
SC
SC
24V
COM
G
Y1 Y2 O/B L DA GND
W2
W1/E
W1/E
3
2
4
YO/D
A
LO/BY2Y1R GC W2
Unit Low
Voltage
Term. Strip
1
12-Pin
Vent Plug
Factory installed jumper. Removejumper andconnect
1
to N.C fire alarm circuitif emergency shutdown required.
Wire not needed below 15KW.
2
Wire required for dehumidification modelsonly.
3
Do not connect "A" from thermostat ifoptional CO2controller is used
4
0-10 VDC modulating C02control signal formodulating ventilation
5
control (optional for ECON only- see vent instruction manuals)
6
8
23 5 7
ALL VENT OPTIONS PLUG IN HERE
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
B/W1
119
2
4
3
W2C GRT Y1 Y2
L DA 3
W3
4
Ensure model configuration isheat pumpand notheat/cool. Must be configured to programmable
and fan set to be programmed fan for the "A"output to function during scheduled occupied
6
periods. Must be configured formulti-stage for Y1 output to beactive 1ststage cooling. For
dehumidification, must be configured for "No Economizer" for YO/D tobe active forhumidity
control.
7
Do not add these wiresif settingup for modulatingcontrol.
Factory installed jumper. Removejumper to activateBalanced Climate
8
A 2-stage thermostat is recommended forBalanced Climatemode.
5
Optional CO2 Controller
Bard Part#8403-067
1
24VAC
2
CO2 OUT
3
TEMP-OUT
65421R
1012
4
5
6
7
mode.
™
MIS-4063 A
Manual 2100-708A
Page 11 of 17
Page 12
8403-057
9
(TH311OD1040)
or T4 Pro 8403-089
8403-058
(TH522OD1151)
8403-059
(TH522OD1219/U)
or T6 Pro 8403-090
7
FIGURE 23
Non-Programmable Thermostat Connections for ECON-NC5 with Air Conditioners
Units With Dehumidification
WCRc YR G
WRc CR G Y Y2
B
O
8
W2
6
35
4
8403-038
Mechanical Humidist at
8403-047
Electronic H umidistat
10
Unit Low
Voltage
Term. Strip
1
12-Pin
Vent Plug
Factory installed jumper. Remove jumper and connect
1
to N.C fire alarm circuit if emergency shutdown required.
2A
Wire not needed below 15KW.
Install Jumper for 1 stage electric heat on units with more
2B
than 10KW.
Wire required for dehumidification models only.
3
For vent operation, add jumper if optional CO2 controller is not used.
4
Vent will run while blower is energized.
For ECON & CRV-V an additional wire change is required
See install Manual.
5
Do not add these wires if setting up for modulating control. See note 7.
6
23 5 7
ALL VENT OPTIONS PLUG IN HERE
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
119
B/W1
2A
3
6
2B
W3
W2C GRT Y1 Y2
L DA 3
4
4
0-10 VDC Modulating CO2 control signal for modulating ventilation control
6
(Optional for ECON Only) - See vent installation manual.
For 8403-058, change "system type", set up Function 1, From 5 (2 Heat/ 1 Cool heat Pump)
7
to 6 (2 Heat / 2 Cool Conventional). For 8403-059, No change required.
Jumper needs added.8
Thermostat will not work with units equipped with economizers.9
Factory installed jumper. Remove jumper to activate Balanced Climate™ Mode.
10
A 2-stage thermostat is recommended for Balanced Climate mode.
Optional CO2 Controller
Bard Part #8403-067
1
24VAC
2
3
CO2 OUT
4
65421R
5
TEMP-OUT
5
6
1012
MIS-3975 A
Manual 2100-708A
Page 12 of 17
Page 13
8403-057
9
(TH311OD1040)
or T4 Pro 8403-089
8403-058
(TH522OD1151)
8403-059
(TH522OD1219/U)
or T6 Pro 8403-090
7
FIGURE 24
Non-Programmable Thermostat Connections for ECON-NC5 with Heat Pumps
R G Y Y2
C
BCRc YR G
O/BRc
AUX
W
O
E
6
Units With Dehumidification
8403-038
Mechanical Humidist at
8
8403-047
35
4
Electronic H umidistat
10
Unit Low
Voltage
Term. Strip
1
12-Pin
Vent Plug
Factory installed jumper. Remove jumper and connect
1
to N.C fire alarm circuit if emergency shutdown required.
Wire not needed below 15KW.
2
Wire required for dehumidification models only.
3
For vent operation, add jumper if optional CO2 controller is not used.
4
Vent will run while blower is energized.
For ECON & CRV-V, an additional wire change is required.
See install manual
5
Do not add these wires if setting up for modulating control. See note 6.
6
23 5 7
ALL VENT OPTIONS PLUG IN HERE
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
119
B/W1
2
3
W3
W2C GRT Y1 Y2
L DA 3
6
4
4
0-10 VDC Modulating CO2 control signal for modulating ventilation control
6
(Optional for ECON Only) - See vent installation manual.
For 8403-058, change "system type", set up Function 1, From 5 (2 Heat/ 1 Cool heat Pump)
7
to 6 (2 Heat / 2 Cool Conventional). For 8403-059, No change required.
Jumper needs added.8
Thermostat will not work with units equipped with economizers.9
Factory installed jumper. Remove jumper to activate Balanced Climate™ Mode.
10
A 2-stage thermostat is recommended for Balanced Climate mode.
Optional CO2 Controller
Bard Part #8403-067
1
24VAC
2
3
CO2 OUT
4
65421R
5
TEMP-OUT
5
6
1012
MIS-4064 A
Manual 2100-708A
Page 13 of 17
Page 14
GRAPH 1
W42AC ECON-E & WD Ventilation Delivery
GRAPH 2
W48AC ECON-E & WD Ventilation Delivery
Manual 2100-708A
Page 14 of 17
Page 15
GRAPH 3
W60AC ECON-E & WD Ventilation Delivery
GRAPH 4
W72AC ECON-E & WD Ventilation Delivery
Manual 2100-708A
Page 15 of 17
Page 16
FIGURE 25
Call for Ventilation With or Without Compressor Operation
FIGURE 26
Call for Compressor or Fan Only with Ventilation Off
Manual 2100-708A
Page 16 of 17
Page 17
FIGURE 27
Wiring Diagram
Damper
Motor
2
TEMPERATURE
SENSOR
BLACK
RED
WHITE
GREEN
10K OD
BLACK/WHITE
4-Pin
Plug
1
2
3
4
RED/WHITE
PURPLE
YELLOW
BROWN/WHITE
ORANGE
ORANGE
NO CONTROL ECONOMIZERWIRING DIAGRAM
12 PIN
VENT PLUG
6
24V COMMON
7
3
24V INPUT SIGNAL
1
5
2
4
0-10V DC INPUT SIGNAL
1211109 8
52
10K OHM
OD TEMP.
THERMISTOR
4056-247
Manual 2100-708A
Page 17 of 17
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