3
ENERGY MANAGEMENT RECOVERY
(EMR)
When the EMR feature is activated the thermostat’s
microcomputer calculates the time it will take to change the
room temperature to the next heat or cool program setting.
Then the thermostat will start the system before the next
programmed period so that the desired temperature is reached
at or near the beginning of the period (the thermostat calculates
15 minutes for every 1°F temperature change). This feature
provides better effi ciency by allowing gradual temperature
changes.
For example: The thermostat is programmed to provide an
overnight heating temperature of 66°F, and during the next
program period, beginning at 6:00 AM, the programmed
temperature is 70°F. With EMR activated, the thermostat will
automatically start the heating system at 5:00 AM, so that the
programmed temperature of 70°F is reached by about 6:00
AM.
If the overnight room temperature drops only to 68°F, the
thermostat will start the system at 5:30 to reach the programmed
temperature of 70°F at 6:00.
The thermostat is shipped with the EMR feature active, which
means that the thermostat will start the heating system before
the beginning of the next program period.
To deactivate the EMR function, see the Confi guration menu
on Page 5). The thermostat will then wait until the programmed
time to start the system for a temperature change.
INSTALLATION
WIRING DIAGRAMS
R
C
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 2. Typical wiring diagram for single transformer single stage systems
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
YO/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Heat Relay
Fan
Relay
Optional
Optional Jumper for
Single Stage Heat Pump
R
C
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 3. Typical wiring diagram for two transformer single stage systems with NO safety circuits
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
YO/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Heat Relay
Fan
Relay
Optional
Limit or
Safety
Switches
TWO COMMONS MUST
BE JUMPERED TOGETHER!
HOT
NEUTRAL
120 VAC
24 VAC
CUT AND
TAPE OFF!
If safety circuits are in
only one of the systems,
remove the transformer
of the system with NO
safety circuits.
NOTE
Optional Jumper for
Single Stage Heat Pump
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