The following information is provided for the installation of ductwork and hot water, chilled water, steam, condenser water, and condensate piping. These requirements are in addition to, and do not supersede, any local code or project documentation requirements. It is the installer's responsibility to ensure that all work meets the project specification and local code requirements.
AboveAir Technologies produces units with a variety of airflow patterns, including same-face, straight-thru, and 90° configurations. Refer to your submittal information to verify your unit configuration and connection dimensions. Airflow patterns may additionally be found at Airflow Downloads.
All ductwork should be fabricated according to the project documentation and current industry standard practice. Supply ductwork should be insulated, sealed, and provided with a vapor barrier. Any ductwork passing through unconditioned space should be insulated and covered with a vapor barrier.
Connections to the unit should be made with a 1-inch flange utilizing industry-standard vibration isolation materials. Do not support ductwork from the unit. Do not make hard duct connections to the unit. The duct connection to the unit should be the same size as the connection on the unit; do not blank off any portion of the inlet or outlet.
Note: The blower and pulley (if applicable) configuration has been selected based on static pressure requirements included in the project documentation. While the unit is provided with adjustable pulleys (if applicable) for adjustment, significant deviations from the design external static pressure may result in blower stability issues or inadequate airflow. External static pressures much lower than design may require the addition of a balancing damper. External static pressures much higher than design may require a larger motor.
Note: AboveAir Technologies units are also available in a variety of free discharge options that do not require duct connections. When locating the unit, pay careful attention to the airflow pattern. Ensure the grille or air device is directed so that airflow is not directed into walls or corners.
All units with condensate pumps require a check valve at the discharge. Your pump may contain an internal check valve: verify prior to making any connection to the condensate system. Check valves are also required in any system where backflow into the unit is possible or as required by the local authority.
Units have a 3/4” or 1” OD copper condensate drain connection stubbed out through the side of the cabinet. A P-trap is required on the drain line and should be sized by the specifying engineer as required for a draw-through type application. Improperly sizing the trap may result in water being entrained in the air stream or cause the drain pan to overflow. The drain line pipe size should match the connection size. Slope all drain piping away from the unit in accordance with local code and project requirements.
Units with a factory mounted condensate pump have a 1/2” OD copper drain stubbed out through the cabinet. A 1/2” copper sweat connection or 1/2” ID vinyl tubing may be used for connection.
Units have a 3/4” or 1” OD copper condensate drain connection stubbed out through the side of the cabinet. A P-trap is recommended on the drain line and should be sized by the specifying engineer. In order to ensure proper drainage, the top of the pipe at the inlet to the condensate pump must be below the top of the drain pan. Condensate pump discharge may be 1/2” OD copper or vinyl tubing.
The condensate pump must be independently supported and level. Do not support pump from piping or unit panels. Supporting the pump from the unit structure is acceptable, if other piping requirements can be met.
AboveAir Technologies recommends Type L copper or Schedule 40 black steel pipe for all water pipe installations and ASTM A53 Schedule 80 black steel pipe for steam and steam condensate. Fittings and joining method should be appropriate to the pressure rating as indicated by the specifying engineer. Support pipe with hangers designed for the appropriate pipe type. Do not support any piping from the coil. Comply with all relevant national and local code requirements.
Insulation is recommended on chilled water, heating water, and steam piping. Insulation is not required on condenser water piping unless specified by the engineer or required by local code. Refer to project documentation, local, and national codes for additional requirements, insulation types, and thicknesses.
Water installations must include a balancing valve (manual or automatic), a strainer, shut-off valves, P-T ports, and vibration isolation. These piping specialties may be field-provided or purchased as a factory-provided hose kit including all required specialties. Steam installations must include a strainer, steam trap, dirt leg and steam and condensate shut-off valves. These specialties are the minimum required by the manufacturer; refer to construction documentation for additional requirements.
Control valves are available in 2- or 3-way configurations and may be either on/off or modulating type. Chilled water, hot water, steam, and freecooling valves may be field or factory installed; refer to submittal for your particular configuration. Condenser valves are factory mounted and include stub-outs for field connection.