11
Service of Heating/Air
Conditioning, Water
Heater and Clothes Dryer
When technicians service any electrical equipment that
is controlled by the 9212, they should be advised that
you have a demand controller. They should also be
warned not to disconnect the controller wiring or leave
its power supply (circuit breaker) off. Otherwise, they
may unknowingly disable your controller which could
result in a very high electric bill. Damage could result to
your controller by incorrect rewiring of your controller’s
remote air conditioner relays.
The Energy Sentry 9212 Controller simply acts as an-
other switch on the water heater, dryer or heating/
cooling equipment. It cannot cause damage or prema-
ture failure of the equipment it is connected to, when it
is installed and set correctly. Nor can it cause a higher
electric bill than you would have had without a control-
ler.
When the power to the 9212 Controller is off at the
breaker panel, power will be available to all controlled
loads as long as the power to the controller is off
(contacts close when power is off). Without power, the
9212 Controller cannot control your demand. This is
why the power must be restored to the controller after
a service call.
Hints for Maximum
Savings
When the setting is to be decreased, (for example from
10 KW in February to 8 KW in March for heating) the
setting should be changed
before
your utility meter is
read.
When the setting is to be increased (for example, from 6
KW in May to 7 KW in June for air conditioning), the
setting should be changed
after
your utility meter is
read.
Meter readings are taken on various days of the month
and depend on the billing interval you happen to be on
with your utility company. You can check past bills to
determine this date or call the utility directly.
Your actual kilowatt demand is displayed on the Control/
Display Unit. If this figure consistently reads 1 KW or
more below your demand limit when in the
Average
display mode and the alarm buzzer rarely sounds, you
should reduce your demand limit by 1KW for increased
savings.
You can help greatly in increasing the effectiveness of
your 9212 unit and increase your savings, by trying to
avoid turning on two or more major appliances at the
same time. For example, homeowners should try to avoid
using the clothes dryer and electric range at the same
time whenever possible.
Do not use minimum on or off times on any loads other
than inductive loads. If used, keep them as short as
possible.
Chart B. Heat Pump/Air Conditioner Home
Load Control Strategy:
Fixed Priority
Priority
Shed Sequence
Load
Demand
1 (Highest)
Last
Dryer
5.5 KW
(Heating Elements Only)
2
Seventh
Compressor #1
3.0-7.0 KW
3
Sixth
Compressor #2
3.0-7.0 KW
4
Fifth
Water Heater
4.5 KW
5
Fourth
Strip Heat #1
5.0 KW
Elec. Furnace
6
Third
Strip Heat #2
5.0 KW
Elec. Furnace
7
Second
Strip Heat #3
5.0 KW
Elec. Furnace
8 (Lowest)
First
Strip Heat #4
5.0 KW
Elec. Furnace
NOTE:
(1) Compressor is not shed when outside temperature is below 30°F (when outside thermostat is installed).
(2) Compressor cannot be restarted for at least five minutes after it is shed. This delay feature is for
compressor protection.
