Installation manual

7
Step 7, If the Alarm Buzzer Sounds: The alarm buzzer in your Control/Display Unit sounds
and the Reduce Load indication (4) will come on when the 9312 has done all it can do to
reduce your electrical demand and actual demand is still greater than the demand limit.
That is, all circuits that your 9312 has control over have been turned off, but due to high
base load, this is not enough. In this situation, your demand limit may be unrealistically
low for the level of comfort or appliance use you desire. Loads within minimum “on” times
(such as heat pump or air conditioning compressor) may cause the buzzer to temporarily
sound until the particular “on” time has elapsed.
To silence the Buzzer, turn off some unnecessary appliance or load or, if necessary,
increase the kW Demand Limit one number at a time until the buzzer stops. If you
choose to turn off an uncontrolled load, you may monitor your actual demand in the
Instantaneous mode in order to see the effect of each load on overall demand
(see page 12 - Table 2).
If the alarm buzzer sounds too often, or if heating or cooling levels are inadequate, you
may have to increase your demand limit or change your load control strategy. Increase
the kW Demand Limit by one and note whether that change solves the problem before
increasing the limit further. It may take as long as one hour for the new level to be
reached.
Setting the Demand Limit
There are no xed demand settings that will be suitable for everyone. The level of energy
(demand) that is required to satisfy comfort, economy, and convenience will vary widely
with the uniqueness of each house, but even more so by the occupants.
In arriving at the best demand setting for you, we recommend that you start with the
lowest kW that you think you will need during the present billing period. The unit has a
demand limit setting range of 2 to 30 kW.
If you need more energy to maintain comfort, just increase the kW, but not more than
one or two kW at a time. If, after a few hours, this is not enough, increase it by one or two
more kW again until you are comfortable.
It is important to remember that once the meter increases its peak demand will not come
down until the meter is reset to zero each month by the meter reader. Table 1 on page 12
shows typical kW Values by Month and gives you some guidelines for setting your demand
limit by seasons.