DUCT WORK

All duct work, supply and return must be properly sized for the design air flow requirement of the equipment. Air Conditioning Contractors of America (ACCA) is an excellent guide to proper sizing. All duct work or portions thereof not in the conditioned space should be properly insulated in order to both conserve energy and prevent condensation or moisture damage.

Refer to Table 9 for maximum static pressure available for duct design.

Design the duct work according to methods given by the Air Conditioning Contractors of America (ACCA). When duct runs through unheated spaces, it should be insulated with a minimum of one inch of insulation. Use insulation with a vapor barrier on the outside of the insulation. Flexible joints should be used to connect the duct work to the equipment in order to keep the noise transmission to a minimum.

Ducts through the walls must be insulated and all joints taped or sealed to prevent air or moisture entering the wall cavity.

Some installations may not require any return air duct. It is recommended that on this type of installation that a filter grille be located in the wall. Filters must be of sufficient size to allow a maximum velocity of 400 FPM.

NOTE: If no return air duct is used, applicable installation codes may limit this cabinet to installation only in a single story structure.

FILTERS

A one inch throwaway filter is supplied with each unit. The filter slides into position making it easy to service. This filter can be serviced from the outside by removing the service door. A 2-inch pleated filter is also available as an optional accessory. The internal filter brackets are adjustable to accommodate the 2-inch filter by bending the metal tabs holding the 1-inch filter down. There are two tabs on each side of the filter.

FRESH AIR INTAKE

All units are built with fresh air inlet slots punched in the service panel.

If the unit is equipped with a fresh air damper assembly, the assembly is shipped already attached to the unit. The damper blade is locked in the closed position. To allow the damper to operate, the maximum and minimum blade position stops must be installed. See Figure 2.

All capacity, efficiency and cost of operation information as required for Department of Energy “Energyguide” Fact Sheets is based upon the fresh air blank-off plate in place and is recommended for maximum energy efficiency.

The blank-off plate is available upon request from the factory and is installed in place of the fresh air damper shipped with each unit.

CONDENSATE DRAIN

This unit employs an automatic condensate disposal system consisting of a base drain pan, drain valve and fan blade with slinger ring. A plastic drain hose extends from the evaporator drain pain at the top of the unit to the base drain pan at the bottom. At temperatures above 40°, the drain valve located between the condenser coil and fan shroud is closed allowing water to build up in the base to a height of 5/8" to 3/4". The fan blade with slinger then rotates in this water and throws the water onto the condenser coil. This disposes of the water by evaporating it on the hot condenser.

At temperatures below 40°, the drain valve opens draining the base pan and preventing freeze ups that could damage the coil or fan blade.

FIGURE 2

FRESH AIR DAMPER

Manual 2100-234I

Page

7 of 17

Page 6 Page 8
Page 7
Image 7
Bard WA121 installation instructions Duct Work, Filters, Fresh AIR Intake, Condensate Drain, Fresh AIR Damper
Page 6 Page 8

WA121 specifications

The Bard WA121 is a cutting-edge heating and cooling unit that has been designed for residential and light commercial applications. With a focus on energy efficiency and user comfort, the WA121 stands out in the competitive HVAC market. One of its most notable features is its energy efficiency rating, which meets or exceeds the standards set by the Department of Energy. This translates to significant savings on utility bills, ultimately benefiting both the environment and the consumer's wallet.

A key characteristic of the Bard WA121 is its advanced direct expansion system. This feature allows for optimal heat transfer, resulting in quick and effective temperature regulation. The unit is equipped with a high-efficiency scroll compressor that ensures smooth operation and reduced noise levels, making it suitable for installation in residential settings without disrupting daily life.

The versatile design of the WA121 enables it to be used in various applications, from offices and schools to workshops. Its compact structure means that it can be easily integrated into tight spaces while still delivering robust performance. The unit is built to withstand harsh conditions, featuring a durable cabinet that is made from galvanized steel and finished with a weather-resistant powder coating.

Another outstanding feature is the integrated microprocessor control. This technology allows for precise temperature management, ensuring consistent comfort levels throughout the space. Additionally, the WA121 comes with a programmable thermostat option, providing users with the flexibility to optimize energy consumption based on usage patterns.

The Bard WA121 also focuses on user convenience with its easy-to-access maintenance points. The design allows technicians to perform routine service checks and repairs without excessive disassembly, thereby reducing downtime and maintenance costs.

In terms of airflow, the WA121 utilizes a multi-speed fan that can adjust to varying conditions, ensuring that air distribution remains efficient regardless of external temperatures. This adaptability enhances the overall performance of the unit, making it an ideal choice for diverse environments.

Overall, the Bard WA121 is engineered with a blend of efficiency, durability, and user-friendliness that positions it as a reliable solution for heating and cooling needs. With its commitment to performance and innovation, it is a solid investment for those looking to upgrade their HVAC systems.
Top Page Image Contents