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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.
WORKING NORMALLY
OFF - THERMOSTAT IS
OVERRIDING THERMOSTAT
ON - ENERGY SAVER IS
RED LED
HEAT / AIR
SYSTEM
Y
E
L
LO
W
B
LA
C
K
R
E
D
G
R
E
E
N
SAVER MODULE
PROGRAMMABLE ENERGY
THERMOSTAT
EXISTING
LOW VOLTAGE
BLACK
RED
YELLOW
GREEN
Summary of Contents for lumina
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