Valance Units

Valance heating and cooling units utilize hydronic coils mounted in an architectural enclosure in order to provide heating and cooling for the occupied space. The units are generally mounted near the ceiling along an outside wall. In NuClimate’s standard valance units (Model VAL) the coils operate with natural convection and radiation to provide heating and cooling into the spaces. NuClimate’s Model VAL-FA incorporates the use of a 12 volt DC fan to provide greater capacities and better temperature distribution in the space. NuClimate’s Valance system has a chilled water/hot water coil and it receives its water supply from the system’s pumps. Water is supplied by either the system’s boilers or chillers to send hot or cold water to the valance coil. The hot or cold water passing through the coils creates a temperature difference which induces room air to flow through the coil and thus produces hot or cold air. As the Valance Unit chills the air around it, the air becomes denser and falls to the floor. It is replaced by warmer air moving up from below, causing a constant flow of convection and cooling the room. Heating works in much the same fashion, similar to a steam radiator. The Thermostat controls the flow of water to the Valance Unit to ensure room comfort is maintained. With the VAL-FA system, a 12 volt DC fan assists natural convection to provide greater airflow through the coil. This produces higher capacities and better air circulation and temperature distribution across the occupied space. Valance units are quiet, efficient and very easy to maintain. Both two pipe and four pipe systems are available.
The NuClimate Valance unit comes with an optional independent drain pan. This allows for condensate to properly and efficiently drain without using the enclosure as the drain pan. The drain can be properly sloped to ensure 1”slope for every 10 Feet. Multiple drain pans can be cascaded in series to extend the drainage system. The NuClimate drain pan is designed to factory-set the slope. The contractor hangs the drain pan, using a slot system to slope the drain. Since the drain pan is independent, the exterior enclosure is not sloped. This means that the enclosure will fit better while still allowing aesthetic considerations such as custom shapes and profiles
NuClimate prides itself on being a terminal unit manufacturer. We continue this tradition in the design of our Valance Unit. The covers are removable and lockable (if required), installed with fasteners to eliminates the concern of the cover inadvertently coming off the rail, while also being easy to remove for maintenance personnel. The aluminum extrusions are gasketed at the factory to insure that the coil does not transfer cold temperatures to the aluminum extrusions.

VALANCE UNIT OPERATION

 

Model VAL

HEATING MODE
When in heating mode, hot water circulates through the valance unit coil. As air passes across the coil it is heated, causing the air to rise by way of natural convection. The rising air heats up the ceiling and the outer aluminum enclosure of the valance unit which radiates heat down into the occupied space.

COOLING MODE
When in cooling mode, cold water circulates through the valance unit coil. As air passes across the coil it is cooled, causing the air to become more dense and drop towards the floor. As the cool air drops, warm air from the room circulates towards the ceiling and is induced through the valance unit coil. As air moves across the coil, the moisture in the air condenses on the fins of the coil. Condensation collects in the drain pan and is removed by the drainage system.

 
 
 
 
 
 
 

Model VAL-FA (Fan Assist)

HEATING MODE
When in heating mode, hot water circulates through the valance unit coil. Air flow through the coil is enhanced due to the 12 volt DC fan assisted induction box located on the back of the valance unit. As air is induced over the coil it is heated and circulated within the room. The air heats up the ceiling and the outer aluminum enclosure of the valance unit which radiates heat down into the occupied space.

COOLING MODE
When in cooling mode, cold water circulates through the valance unit coil. Air flow through the coil is enhanced due to the 12 volt DC fan assisted induction box located on the back of the valance unit. As air is induced over the coil it is cooled, causing the air to become more dense and drop from the ceiling towards the floor. As the cool air drops, warm air from the room circulates and is induced through the valance unit coil. As air moves across the coil, the moisture in the air condenses on the fins of the coil. Condensation collects in the drain pan and is removed by the drainage system.

INDEPENDENT DRAIN PANS

NuClimate uses independent insulated drain pans in order to remove any condensation that may form on the valance unit coil. Drain pans extend past coil surface areas to guarantee any condensation forming on return bends or coil casing ends up in the drain pan. A single drain pan can be up to 10 feet in length. When longer distances must be covered double or triple drain pans are used (see figures below) The drain pan is fully cleanable and can be insulated on the interior or exterior as specified by the engineer. Closed cell interior drain pan insulation can be effective in minimizing sound from condensation dripping from the coil into the drain pan. Condensate drains are sloped at 1” per 10 feet and are set by the manufacturer to ensure thorough drainage.



 
 
 

UNIT MAINTENANCE

The architectural valance cover and the drain pan are hinged to allow for easy access to valance unit internals. The drain pan can be removed from the unit for cleaning and can easily be replaced.

DESIGN CONSIDERATIONS

The application of a valance system is similar to that of any hydronic system. First, the designer must establish the correct location for the valance system and the amount of space available. This is done by establishing the wall-to-wall dimensions of the room. In most cases, the valance unit should be applied against the outer wall of the room, high in the corner where the outer wall meets the ceiling. The enclosure should run wall-to-wall when possible. When a valance unit is not being designed wall to wall, end caps can be applied to hide internal components. NuClimate recommends that the coil be 24” smaller than the overall wall length. This is the optimal length for allowing room for valves, flow balancing devices, and traps if required. Although the coil could be larger, the designer must ensure room for the piping and accessories. In selecting the correct coil size an engineer must compare the room loads to the output of the valance coil. Each valance unit comes complete with a choice of a 5”, 7” 10”, 12.5” 15”, or 20” wide horizontal coil. Available to all engineers is NuClimate’s software program which calculates cooling and heating capacities, water pressure drop through the coil, leaving water temperatures, and a number of other factors needed by an engineer for sizing the entire system. NuClimate valance units are available for two and four pipe systems. A two pipe system requires that the coil is either in cooling or heating mode. To determine the left and right hand side an engineer would be standing in the occupied space looking at the enclosure. In a four pipe system an engineer can provide heating in one room and cooling in another.
When higher capacities or improved air distribution is required an optional 12 volt DC fan assist module can be added to the base valance system. The fan assist module is mounted into an induction baffle at the factory. The fan assist induction module induces additional airflow through the coil to get higher capacities. A 24 Volt AC regulator to 12 Volt DC is provided by factory for connecting power to the fan assist module. The focused flow axial fan draws 0.6 watts at 0.05 amps and provides 50 CFM of airflow in the space. These fans carry a six year warranty and are designed for 150,000 hours of bearing life.