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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 DSL-450. When
recovering from setback, the thermostat runs the heat pump first. It will run the auxiliary heat only if the rate of
temperature rise is less than 6 degrees F. per hour.
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 31A00-1 Indoor/Outdoor Temperature and Model 31A00-2 Indoor/Outdoor
Temperature and Humidity Sensor is used for sensing indoor temperature and/or reporting the relative humidity from 0 to 100
percent or for sensing the outdoor temperature and/or reporting the outdoor relative humidity. The outdoor temperature can be
displayed on the console, spoken over the telephone, or displayed on an HAI Communicating Thermostat.
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 4-conductor wire from the Omni II controller to the selected location.
RED
BLACK YELLOW
GREEN
YELLOW
BLACK
RED
GREEN
12V GND H T
INDOOR / OUTDOOR TEMPERATURE
AND HUMIDITY SENSOR
FIGURE 11 - TEMPERATURE / HUMIDITY SENSOR CONNECTIONS