Bard ECON-NC5 Installation Instructions Manual
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
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
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
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
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
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
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