System Types And Definitions - Crestron CHV-THSTAT Operation And Installation Manual

Thermostats
26 • Thermostats: CHV-TSTAT and CHV-THSTAT
Crestron CHV-TSTAT and CHV-THSTAT
system mode functions in both directions.
NOTE: If an out-of-range setpoint is entered, the setpoint is assigned its limit value
in that direction.
NOTE: The Screen Options selected in setup are seen when the view key is pressed
in normal operation.

System Types and Definitions

The first setup choice is the heat system type. There are three main types of
heating/cooling systems.
1. Heat/Cool, Radiant Heat or Forced Air Heating/Cooling, 1 or 2 Stages
2. Heat Pump, 1 or 2 Stages, Auxiliary Heat or Dual Fuel
3. Slab System (Slab1 through Slab 5B)
1. Heat/Cool Systems Definitions
Radiant Heat 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.
Forced Air systems: In a ducted heating/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.
One or Two Stages: 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/Cool system setup begins on page 28.
2. Heat Pump Systems Definitions
A heat pump extracts available heat from one area and transfers it to
another. Even cold air contains some heat, and 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.
Dual Fuel: 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.
Aux (Auxiliary) Heat: 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.
Heat pump system setup begins on page 31.
Operations and Installation Guide – DOC. 8163C