4.Heat Pumps
Programmable Energy Saver Modules are compatible with heat pumps, however, the savings gained by setting the heat pump back may be erased by the auxiliary heaters when the heat pump tries to recover from the setback. A PESM will work best with heat pumps that have one or more of the following features:
a.An outdoor temperature switch that prevents the auxiliary heat from coming on unless it is very cold outside. This is sometimes called a "heat balance" switch.
b.A thermostat that uses rate of rise to determine if auxiliary heat is necessary: The Enerstat Model
c.An alternative auxiliary heat source that is inexpensive (i.e. gas).
These features will avoid the use of auxiliary heat (usually an electric strip heater) which is more expensive than using the heat pump when recovering from setback. In general, heat pumps take a longer time to recover from setback, so it may be advantageous to program a setback only for extended periods, such as a vacation.
TEMPERATURE, OUTDOOR TEMPERATURE, AND HUMIDITY
When connected to the controller, the Model
1.Each Temperature Sensor requires one zone input. Each Humidity Sensor requires one zone input.
-Program the zone type as an Outdoor Temperature (Type 81), Temperature (Type 82), Temperature Alarm (Type 83), or Humidity (Type 84).
2.When mounting outdoors, plan to mount under an overhang or to the underside of an eave, otherwise known as the soffet, to protect it from direct sunlight and rain. Run a
BLACK YELLOW
RED GREEN
RED BLACK GREEN YELLOW
12V GND H T
INDOOR / OUTDOOR TEMPERATURE
AND HUMIDITY SENSOR
FIGURE 11 - TEMPERATURE / HUMIDITY SENSOR CONNECTIONS
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