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Discharge air
temperature is
within target range?
W call with one
Electric Heat
Section ON
More Electric
Heat
available
A
Measured discharge air
temperature is above or
below
target range?
Electric heat ON
S 150 seconds if more than one stage is activated or deacti-
vated.
EVENHEAT Operation
Start Timer Delay
(Note 1)
Stop Delay Timer
Increase heat demand.
Y1 (with or without Y2) +
W1 and W2
Discharge air temperature sensor
setting on Air Handler Control will
remain at set point. W1 demand will
increase set point 15ºF. W2 demand
will increase set point an additional
15ºF. (Total of 30ºF)
Delay Timer
Finished or last
change was up−
stage
Delay Timer
Finished or last
change was
down−
stage
Above
Turn OFF Electric
Heat Section
Adjust Target
Discharge Air
Temperature
Turn ON one
Electric Heat
section
Adjust Target
Discharge Air
Temperature
NOTE Optional Outdoor Thermostat (Wired between
R and W3) will lockout electric elements 3, 4 and 5.
Y1 ON and
Y2 OFF
Activate Y2
Below
No
Ye s
Note 1 Activation delay
S 120 seconds if one heat stage is or deactivated
No
No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Change in Heat
demand from
room thermostat?
Adjust Target Discharge Air
Temperature
Heat Pump OFF
Discharge air temperature sensor
setting on the Air Handler Control will
remain at set point on W1 demand and
be increased 15ºF for W2 demand.
Heat Pump ON
Figure 26. EVENHEAT Operation (2 of 2)
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