What Is A Hot Deck Cold Deck System

Water and supply 100 degree f. Systems utilize a parallel arrangement of heating and cooling surfaces commonly referred to as hot and. Refer to photo 3 which illustrates damper actuators on a smaller mz system.

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As hot gas bypass will be required.

What is a hot deck cold deck system.

Each zone requires an actuator application. Therefore one actuator may operate the cold deck and hot deck simultaneously. The cold deck is always closed during heating. As the call for heating reduces from full heat the hot deck starts to close the bypass.

Hot air and 55 degree f. Cool air through duct work to a terminal box. Up of two dampers one for the cold deck and one for the hot deck. The dual duct air handlers take 180 degree f.

As the signal approaches 0 the bypass deck is closed the hot deck is fully open and the fan is at full speed. The hot deck is reset based on the zone. As the damper opens one deck it closes the other and vice versa. The ahu had both a cold deck cd and a hot deck hd where both maintained a constant leaving air temperature maybe 55 f and 95 f respectively with mixing dampers mounted on the front or top of the ahu.

Cold decks for providing heating and cooling capabilities simultaneously. It explains how to use the ahu to reset the hot deck and cold deck setpoints. Maintenance or operational staff will be able to advise whether a system is a hot deck cold deck type. The hot deck is halfway open and the fan ramps up to maintain pressure in the unit.

The damper blades for the hot and cold decks are linked together and offset by 90. In other systems the signal may. The hot deck setpoint and the cold deck setpoint operate respectively the water valves to the hot deck coil and the cold deck coil. This application note is relevant when using an ahu to control a multi zone air handler.

In some systems this control may remain for example where the signal is a function of the thermostat branch line pressure. The hot deck cold deck. Typically the ahu controller also resets the hot deck and cold deck setpoints and controls the zone mixing dampers. Some multizone units control one deck or the other in a multipoint arrangement such that the nearest to full heating controls hot deck temperature.

Temperature reset program is applied to dual duct systems and multizone hvac systems. Hot cold deck systems are found in older office buildings and in institutional buildings but are largely indistinguishable from other ahu based systems to the non technical observer. And 42 degree f.

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