Bard ECON-NC2-A Full Flow Low Leakage Economizer Instruction Manual

Bard ECON-NC2-A Full Flow Low Leakage Economizer

Product Information

• The Full-Flow Low Leakage Economizer with Exhaust is designed for building applications and is compatible with 1-1/2 through 3 3-ton Wall Mount Air Conditioners and Heat Pumps.
  It can be used with Field-Installed DCV Controls and comes in two models: ECON-NC2 and ECON-NC3 (with Factory-Installed Vent Option).

• The product is manufactured by Bard Manufacturing Company, Inc. and is intended for use by trained heating and air conditioning technicians.

Nomenclature

• ECON-NC2 – Economizer Model

General Information

• The installation instructions provided are a guide for technicians installing the economizer package.
• The package includes the economizer housing, electrical harness, miscellaneous hardware, and installation instructions.
• It is important to note that the economizer should only be installed by a trained technician, and the instructions are not meant for mechanically inclined owners to install the package.

Unpacking

• Upon receiving the equipment, it is crucial to compare the model number on the shipping label with the accessory identification information on the orders and shipping document to ensure the correct accessory has been shipped. Inspect the carton housing of each economizer assembly for any visible damage before signing the freight bill. If there are any shortages or damage, it should be noted on all copies of the freight bill. Contact the carrier immediately, preferably in writing, to request inspection by the carrier’s agent if there is concealed damage discovered after loading.

Description

• The ECON-NC Series economizers are not compatible with variable-capacity ECU models.

Product Usage Instructions

Installation of Field-Installed Economizer

1. Perform the basic installation of the economizer.
2. Prepare the unit for economizer installation.
3. Install the outdoor air sensor.
4. Complete the economizer installation.
5. Perform the economizer checkout to ensure proper functioning.
6. Refer to the control wiring connection diagram for wiring connections.

Economizer Features

The economizer features allow for improved energy efficiency and ventilation control in building applications. It is important to ensure that the economizer is used with the appropriate low ambient control kit as specified in the model/year Specification Sheet.

NOTE: These instructions are written to cover field-installed economizers, but are also included with factory-installed economizers. For factory-installed economizers, all portions addressing “installation” are for reference only.

Economizer Features

• One-piece construction—easy to install. Direct-drive actuator eliminates linkage.
• Exhaust air damper—built-in with positive closed position. Provides exhaust air capability to prevent pressurization of tight buildings.
• Actuator Motor – 24 volts, power-open, spring-return, direct-coupled with stall protection. Self-centering shaft clamp and access cover facilitate ease of replacement/maintenance.
• 10K outdoor temperature sensor

Economizer with Exhaust Model Nomenclature

General Information

• The economizer should only be installed by a trained heating and air conditioning technician. These instructions serve as a guide to the technician installing an economizer package, not as a step-by-step procedure with which the mechanically inclined owner can install the package.
• The economizer housing is shipped in one carton, which contains the electrical harness, miscellaneous hardware, and installation instructions.
• Any wall mount unit equipped with an economizer must also have a factory/ÿeld installed with low ambient control. Please refer to the appropriate model/year Speciÿcation Sheet for requisite ÿeld installed low ambient control kit part numbers.

Unpacking

• Upon receipt of the equipment, be sure to compare the model number found on the shipping label with the accessory identiÿcation information on the orders and shipping document to verify that the correct accessory has been shipped.
• Inspect the carton housing of each economizer assembly as it is received and, before signing the freight bill, verify that all items have been received and there is no visible damage. 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.

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 an ÿeld-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 ÿrst 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 suitable 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.
• ECON-NC Series economizers are not for use with variable capacity ECU models.

TABLE 1 Economizer Application

1. Low ambient control is required with w/economizer for low-temperature operation.

Basic Installation

WARNING

• Electrical shock hazard.
• Disconnect the remote electrical power supply or supplies before servicing.
• Failure to do so could result in electric shock or death.

Preparing Unit for Economizer Installation

1. Disconnect power to the unit.
2. Unpack the economizer assembly, which includes the integral economizer with an attached electrical harness, mixed air sensor, body panels, miscellaneous hardware, and installation instructions.
3. From the existing wall mount unit, remove and save (or discard) as directed (see Figure 1):
   • Blower access panel and screws (save)
   • Ventilation access panel (discard)
   • Filter access panel (discard)
   • Filter (save)
   • Outer and inner control panel doors and screws (save)
4. Remove and discard the exhaust cover plate (save screws).
5. Install a new condenser exhaust plate with a screen over opening into the condenser section (see Figure 2).
6. Verify what type of ÿlter racks are in the unit. The unit may include either a ÿlter partition and tray assembly or two separate ÿlter brackets.
   • If the unit contains a partition and tray assembly, this may be left as-is for the ventilator installation. Continue to Step 1 of Economizer Installation.
   • If the unit contains two separate ÿlter brackets, remove the ÿlter brackets. Two types of ÿlter brackets have been used with these wall-mount units. If the ÿlter brackets are mounted ˜at, they can be used with the economizer. If the brackets are set at a 30° angle, they must be removed, discarded and ÿll plates added (see Step 7). The circuit breaker offset plate must be loosened and moved slightly to gain access to several of the screws holding the ÿlter brackets in place. Tighten the screws holding the control panel after the ÿlter brackets have been removed.
   • If ÿlter brackets were removed in Step 6, proceed to Step 7. If the brackets were not removed, proceed to Outdoor Air Sensor Installation.
7. Install ÿlter bracket ÿll plate as shown in Figure 4.
8. Install provided ÿlter brackets on the economizer (see Figure 4).

Outdoor Air Sensor Installation

1. Remove and save both side grilles and screws.
2. Install the outdoor temperature sensor in the lower condenser section on the same side as the control panel with two (2) screws provided as shown in Figure 6.
3. Route the wire harness through the condenser base and into the control panel (see Figure 7). Secure with two wire ties (provided). Push the harness up through the grommet at the bottom of the control panel. Secure with wire ties (provided) to the other wires in the grommet. Ensure the wire harness cannot contact moving parts or copper tubing. Replace side grilles.

Economizer Installation

1. Connect the 12-pin male plug into the female plug-in side of the control panel as shown in Figure 8. See the wiring diagram found on.
2. Remove (and discard) left and right ÿlter brackets from the economizer assembly if existing wall mount unit brackets are in place.
3. For units with a partition and tray assembly, install the return ÿll plate. Refer to Figure 5 on.
4. Insert the economizer into the opening in the wall unit between the ÿlter rack (if not removed earlier) and condenser section, being careful not to tear unit insulation.
5. To clear the blowers, position the economizer at a 45° angle under the blowers. Fully seat economizer assembly to the rear of the wall unit cavity. Slide the economizer to the right and line up with the return air opening in the back of the wall unit.
6. Left-hand units: Use the 52″ wire harness (provided). Plug the 12-pin male connector into the female plug in the control panel. Route the wire harness to the back of the economizer and attach to the upper ÿll plate using the push-in wire ties provided (see Figure 9).
   • Plug the male 12-pin connector from the economizer actuator into the wire harness.
7. Right-hand units: Plug the 12-pin male connector straight into the female plug in the control panel. Plug the outdoor sensor wire connectors into the spade connectors on the 12-pin male plug (orange wires) as shown in Figure 10.
8. Connect the vent option front to the vent hood door (see Figure 11) using ten (10) screws (supplied).
9. Re-insert ÿlter into ÿlter brackets. The arrow on ÿlter should point up.
10. Install ÿlter door.
11. Attach blower access panel.

Economizer Checkout

1. Attach wall unit outer and indoor control panel doors.
2. Turn power to unit on.
3. After conÿrming economizer operation, attach the economizer hood mist eliminator (with air˜ow arrow pointed towards unit), control door and front door.

Control Wiring Connection Diagram

See the economizer wiring diagram in Figure 12. For low voltage connections, refer to the wall-mount unit installation instructions manual.

• Bard Manufacturing Company, Inc. Bryan, Ohio 43506www.bardhvac.com

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