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PROGRAMMABLE ENERGY SAVER MODULES
NOTE: Programmable Energy Saver Modules must be connected to zones 9-16 on the Omni LTe controller.
1. Omni LTe can support up to 8 Programmable Energy Saver Modules (PESM). Each PESM requires one security
zone input and one controller output. The zone input corresponds to the controller output (Zone 9 and Output 1
through Zone 16 and Output 8, respectively). If Zone 9 is used, Output 1 must be used as its pair.
2. When setup as an Energy Saver Zone Type (Type 80), the zone and unit (output) is used as a pair to read in
temperature and control the setback temperature of the house. Only zones 9-16 may be configured as an Energy
Saver zone.
3. Run a 4-conductor wire from the Omni LTe controller to each PESM. Connect as shown in FIGURE 13 (PESM
CONNECTIONS).
4. The PESM should be mounted on an interior wall, preferably close to the HVAC thermostat. Run a 2-conductor
wire from the PESM to the thermostat. Connect the PESM between the RED wire going to the thermostat and the
RED terminal on the thermostat.
5. Program the zone type for PESMs as a Type 80, Energy Saver. It may also be programmed as a Temperature
(Type 82), or Temperature Alarm (Type 83) for special applications.
NOTES ON HVAC SYSTEMS
1. Description of the PESM
The PESM is a temperature sensor and control relay in a small enclosure that mounts near a central heating,
ventilation, and air conditioning (HVAC) system thermostat. The PESM allows the automation system to read the
temperature of the area that the HVAC system controls. The relay in the PESM is used to break the 24V RED
wire between the thermostat and the HVAC system. When the automation system is in setback mode and the
actual temperature is between the LO and HI setpoints, the relay energizes to break the 24V red wire; hence, the
HVAC system will no longer operate.
In heating season, when the actual temperature falls below the LOW setpoint, the automation system turns the
relay in the PESM off, thus restoring power to the thermostat, allowing the thermostat to heat as it normally would
under the control of the thermostat. The PESM will cycle the thermostat on and off to maintain the LOW setpoint.
In cooling season, when the actual temperature rises above the HI setpoint, the automation system turns the relay
in the PESM off and the thermostat will cool as it normally would under the control of the thermostat. The PESM
will cycle the thermostat on and off to maintain the HI setpoint.
The Red LED on the PESM will illuminate when the PESM is overriding the thermostat. The Red LED will be off
when the thermostat is working normally.
If the PESM is disconnected from the automation system, the relay will not energize and the HVAC system will
operate normally, under the control of the thermostat.
2. Standard Heating and Cooling Systems
The PESM is compatible with all mechanical thermostats. Recommended thermostats are simple, round
Honeywell T-87 thermostats. For automatic switch-over from heat to cool, consider a Honeywell T-874
(mechanical) or an Enerstat DSL-300 (electronic) thermostat, although any other mechanical thermostat from
White Rodgers, Robertshaw, etc. will work.
3. The PESM is also compatible with electronic thermostats that run totally on battery power.
4. Heat Pumps
Programmable Energy Saver Modules are compatible with heat pumps, however, the savings gained by setting
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