Crestron Lighting Design Guía de instalación descargar pdf (Pagina 52)

230 V Lighting Design Guide

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Heat/Cool Systems

• Radiant heat is a form of hydronic (hot water) heat that circulates hot water through pipes (baseboard

radiation systems) or special tubing and installs on the perimeter of the house or underneath ﬂoors.

• In a ducted heating and cooling system, a large fan (blower) forces heated air from the furnace into the

ducts and enters the rooms through a register or grill in the ﬂoor or wall.

• Unlike traditional furnaces that turn on and run at full capacity with each demand for heating, two-stage

furnaces operate like two separate furnaces. The unit begins to run in its ﬁrst stage and operates at a

fraction of its heating capacity. This reduced capacity is sufﬁcient on mild winter days. On very cold days,

the furnace adjusts to full capacity (second stage) to meet the demand for heat.

Heat Pump Systems

A heat pump extracts available heat from one area and transfers it to another. Even cold air contains some heat.

Heat pumps can extract heat from the outside air on a cold day and transfer it indoors to maintain a comfortable

temperature. A heat pump also works in reverse during the summer, extracting heat from indoors and transferring it

outdoors.

• A dual fuel system combines an energy-efﬁcient air-source heat pump with a new or existing oil, gas, or

propane furnace. The furnace runs in place of the heat pump in cold weather.

• When the a heat pump can no longer efﬁciently transfer heat from the outside air, the thermostat

automatically turns on a secondary heat source, such as electric resistive heat.

Slab Systems

Slab heating works from the ground up. The heating components are installed below the ﬂoor or are embedded in

a concrete slab. Heat radiates from the ﬂoor to warm the space above. The CHV-TSTAT and CHV-THSTAT support

seven variations of slab heat systems.

SLAB 1: Floor warming only. Operates the slab heat to maintain a particular slab temperature. System mode is

enabled/disabled with Floor Warming Heat and OFF inputs. Slab is maintained at the slab setpoint temperature

value. Connection to the slab output relay is terminal W1.

SLAB 2: One stage space heat with slab maximum. Maintains a particular air temperature using the slab to heat

the space and does not heat over the slab maximum temperature even if this results in the space being

under-heated. Connection to the slab output relay is terminal W1.

SLAB 3: One stage space heat with slab maximum and slab minimum. Performs the same operation as SLAB

2 and also keeps the slab at least as warm as slab setpoint. This may result in the space being overheated to

maintain the slab minimum temperature. Connection to the slab output relay is terminal W1.

SLAB 4A: Two-stage space heat with slab maximum and one stage cool. Maintains the air temperature using

the slab for heat, up to the slab maximum. Augments the air heating by using a second stage of heat (generally a

forced air system). Allows the second stage to operate by itself should the slab reach its maximum temperature

and shut off. Cools the space with cooling call. Intended for heat-cool type forced air systems, with relay output

connections to terminal W1 for slab, terminal W2 for 2nd stage heat, and terminal Y1 for cooling. Off sets the space

control modes and Floor Warming HEAT/OFF.

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Crestron Lighting Design Guía de instalación Pagina 52