energy sentry 9212 Series 3 Owners & Installation Manual
Computerized Energy
Management
Model 9212 Series 3
Owner’s/Installation Manual
Helping you to use energy
more effi ciently
Table of Contents
Operating Instructions
Notice to Users ...............................................................................................................................1
Introduction and Overview of Demand Control ................................................................................. 2
Superior Features of the 9212 .........................................................................................................4
System Description ........................................................................................................................ 5
System Operation ........................................................................................................................... 6
Control Panel Settings & Displays .......................................................................................6
Basic Operations .................................................................................................................7
If You Need Service ............................................................................................................12
Appendix A ...................................................................................................................................13
Installation Instructions
1.0 Introduction ........................................................................................................................ 14
2.0 Tools and Materials Required ............................................................................................. 14
3.0 Pre-Installation System Check List .................................................................................... 14
4.0 Locating the Control Unit....................................................................................................15
5.0 Locating and Mounting the Relay Unit ................................................................................ 16
6.0 Running the Control Cable ................................................................................................. 16
7.0 Wiring the Control Cable to C/D Unit ..................................................................................17
8.0 Mounting the C/D Unit ........................................................................................................18
9.0 Wiring the Control Cable to the Relay Unit ......................................................................... 18
10.0 Wiring the 120 VAC Power Supply to the Relay Unit ......................................................... 18
11.0 Installing and Wiring Current Transformers ......................................................................... 19
12.0 Making up a Load Schedule & Load Assignments ............................................................. 19
13.0 Wiring the Power Relays to Heat Circuits and Hot Water Heater ....................................... 20
14.0 Wiring the Power Relays to Dryer ...................................................................................... 21
15.0 Wiring the Power Relays to Heat Pumps and Air Conditioners .......................................... 22
16.0 System Checkout .............................................................................................................. 23
17.0 System Programming ........................................................................................................ 24
18.0 Wrap-Up .............................................................................................................................29
Warranty Information ..................................................................................................................... 30
Model 9212 Series 3
Owner/Installation
Manual
P/N 09212-94100E Rev. 2/1/07
© 2007 Brayden Automation Corporation
Brayden Automation Corporation
6230 Aviation Circle
Loveland, CO 80538
PHONE (970) 461-9600
FAX (970) 461-9605
www.brayden.com
WARNING:
The installation of the Energy Sentry® Demand Controller is required to be done by a duly licensed and qualified
electrician or electrical contractor.
Notice to Users
This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict
accordance with the manufacturer’s instructions, it may cause interference to radio and television reception. It has
been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
1. Reorient the receiving antenna.
2. Relocate the computer with respect to the receiver.
3. Move the computer away from the receiver.
4. Plug the computer into a different outlet so that computer and receiver are on different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions.
The user may find the following booklet prepared by the Federal Communications Commission helpful: “How to
Identify and Resolve Radio-TV Interference Problems.” This booklet is available from the U.S. Government Printing
Office, Washington D.C. 20402, Stock No. 0004-0000-00345-4.
1
Operating Instructions
Introduction and
Overview of Demand
Control
Congratulations on your decision to purchase the
Energy Sentry Model 9212 Series 3 Electric Demand
Controller. As the owner of an all-electric home metered
under the Demand Billing rate, you are now one of a
growing number of consumers who can lower their
monthly electric bills by reducing energy demand peaks.
The Energy Sentry 9212 Demand Controller enables
you to reduce these peaks while maintaining efficient
use of energy. Your decision to purchase a 9212 represents a sound and intelligent investment which will
repay you for years to come in reduced electric bills,
added convenience and peace of mind. The 9212 is
without question the finest, most versatile electric
demand controller on the market today.
The Demand Billing Rate
Not all electricity costs the same. The reason for this
is the billing rates which your utility makes available to
you. The most common are the Energy and Block Rates.
Under the Energy Rate, you are billed for total energy
used per month (total Kwh use) regardless of how you
use this energy. Owner A in Figure 1 illustrates a typical
daily energy use pattern. Notice the demand peaks in
the morning and evening. Under the Energy Rate, these
peaks do not affect Owner A’s bill since he pays for the
total Kwh use only.
Utility companies are concerned about these demand
peaks since they increase the costs of supplying electricity to their customers. As a result, some utilities offer
a Demand Billing Rate which is a preferred rate to reward
customers who control their peak usage of electricity.
Billing under the demand rate works like this: Suppose
you are heating or cooling your home, washing dishes,
drying clothes and cooking the family dinner all at the
same time. Chances are your home is at peak energy
usage or drawing electricity from the electric company
at a maximum rate. This peak energy usage is illustrated
by Owner A of Figure 1. Under the Demand Rate you
pay for both total energy use (in Kwh like the Energy
Rate) and for your highest average peak energy usage
during the billing period (highest average KW demand).
When compared to the Energy Rate, the Demand Rate
offers a much lower charge for total Kwh use. But, since
there is also a demand charge for the highest average
peak energy usage during the billing period, the savings
could be offset if this demand peak is high.
Now refer to Owner B in Figure 1. In this case, Owner B
is billed under the Demand Rate but has controlled his
peak demand and has correspondingly reduced his
demand charge. The result will be a lower electric bill for
using the same amount of electricity as Owner A. The
key to his savings is in controlling his peak demand and
leveling out his energy usage.
Figure 1. The graph shows identical energy consumption over a one day period, but at two
different peak demand levels.
19
15
ENERGY USE-UNCONTROLLED
10
kW DEMAND
ENERGY USE-CONTROLLED
5
12am 1 2 3 4 5 6 7 8 9 10 11 12pm 1 2 3 4 5 6 7 8 9 10 11 12
OWNER A
OWNER B
DEMAND RATE
TIME
2
Different Meters
Demand rates incorporate the use of a special electric
meter which registers not only the total energy consumed, just like the standard watt-hour meter, but also
has a separate needle, dial or a register which records and
indicates the highest average peak energy usage or
demand peak as recorded over a 15, 30 or 60-minute
demand interval (depending on the utility). Once this
demand peak is registered on the meter, a corresponding
demand charge results even if this peak occurred only
once during the billing period.
To benefit from your Energy Sentry 9212 Demand Controller you must have a demand measuring electric meter
and be billed on a demand billing electric rate from your
utility. Obtain a free booklet or rate sheet from your
power company that describes your electric rate and
how to read your electric meter. We recommend that you
read your metered demand on the day prior to when the
meter is read by the power company, to verify that your
setting matches the meter’s reading.
Where Energy Sentry
9212 Technology Comes In
If it were humanly possible to go through your home
continuously and manually turn off heating or cooling
circuits and major appliances to level out peak demand
whenever necessary, you wouldn’t need an electric
demand controller to take advantage of the demand rate
offered by your utility company. But remember, one slip
in any one demand interval and your utility bill would
reflect a high demand charge.
The 9212 takes over this difficult, continuous burden for
you. The 9212 is one of the most sophisticated products
available for controlling electric peak demand. When
properly used, it can result in average monthly savings
of up to 35% and as much as 50% during heavy-use
months. The sole purpose of the 9212 is to efficiently
allocate electricity usage of electrical loads so that
demand peaks are kept below the level you set without
changing your lifestyle.
How the 9212 Works
The 9212 contains a microprocessor-based computer
which turns certain circuits on and off to keep peak
demand below a limit that you preset. Not all circuits
need to be controlled by the 9212. Circuits controlled
usually include the air conditioner or heat pump, all
heating zones, the dryer, the water heater or any other
load with some thermal storage capacity.
In a typical all-electric home, the morning routine may
involve turning up some thermostats, operating the
range, water heater and other appliances. Normally,
operation of these loads causes a morning peak (such as
that illustrated by Owner A in Figure 1) which registers
on the demand meter.
Now, let’s put the 9212 to work. There are several
optional load control strategies available, but a typical
strategy could involve the 9212 recognizing higher priority loads, such as the dryer, thus cutting back on loads
of less priority, like the heating or cooling loads for a
short period of time, while the higher load or uncontrolled load is on. When the dryer turns off, the power it
had been using is channeled back to the heating or
cooling loads, thus maintaining comfort but reducing
peak demand. The end result is that while you have still
used the amount of energy normally called upon by your
lifestyle, this usage has been leveled out to reduce the
peak demand. This is illustrated by Owner B in Figure 1.
How the 9212 Saves
Now that we’ve examined how the 9212 enables you to
use the energy you are accustomed to, but spreads this
usage out by turning off non-critical loads for short
periods of time, let’s look at how this saves you money.
Remember the utility company helps you save by offering the Demand Rate which is a lower rate per unit of total
power consumed (Kwh). You can save money under this
rate if you control your peak energy usage so as to keep
the corresponding demand charge low.
The following hypothetical example illustrates how the
Energy Sentry 9212 helps you save. Three cases are
presented for a single residence. In all three cases the
total energy consumption is the same. The differences
are in the utility rate structure and whether or not an
Energy Sentry 9212 is installed.
Case I is an all-electric home billed under the Energy
Rate. This differs from the Demand Rate, in that there is
a higher charge for total energy used. Most homes not
under the Demand Rate are billed under the Energy Rate.
Reference to Table 1 shows a monthly energy use of 3000
Kwh. Although rates vary from utility to utility, the
example electric bill based on actual utility rates for this
energy usage level would be $214.80 with 3000 Kwh
being a typical usage for a high use month.*
Case II is the same all-electric home billed under the
Demand Rate. In this case, peak energy usage plays an
important part in determining the total bill. Although
energy use peaks will vary from month-to-month, a
typical value for a high-use month might be 18 KW.
Based on a total usage of 3000 Kwh, the example electric
bill based on actual utility rates would be $211.00**.
Compared to Case I, use of the Demand Rate results in
savings of approximately 2% for the same energy usage.
The reason is the demand charge for the high demand
peak offsets the savings on energy costs.
* Based on Black Hills Power Schedule RTE-14 Energy
Rate, effective January 1, 2007. Does not include fuel
cost adjustment and taxes.
3
Table 1. Customer Bill Comparison
Case I Case II Case III
Energy Sentry
Controlled
Uncontrolled Uncontrolled All-Electric Home
All-Electric Home All-Electric Home Demand
Energy Rate Demand Billing Rate Billing Rate
Energy Use per Month 3000 Kwh 3000 Kwh 3000 Kwh
Peak Demand per Month N/A 18 KW 8 KW
Electric Bill $214.80 $211.00 $154.50
Savings Over Energy Rate ———— $3.80 $60.30
(1.8%) (28.1%)
Savings Over Uncontrolled ———— ———— $56.50
Demand Rate (26.8%)
Case III again uses the same all-electric home billed
under the Demand Rate. The energy usage is 3000 Kwh
which is the same as in Case I and Case II. The difference
is that an Energy Sentry 9212 is now installed and peak
demand is reduced to a maximum of 8 KW. Based on this
peak demand and energy consumption, the electric bill
is reduced to $154.50**. This means a savings of 28.1%
over the Energy Rate in Case I and a savings of 26.8%
over the uncontrolled Demand Rate in Case II. For your
home, installing an Energy Sentry 9212 could result in a
savings of up to 40% off your monthly utility bill during
the heavy-use months with an average annual savings
of up to 35%. The added bonus is that you don’t have
to reduce your overall consumption to save. Rather, just
let your Energy Sentry 9212 level out your usage.
Note: Depending on the application of the 9212 in a
residence, the savings are based on the utility rates in
effect and by how low the Demand Limit is set. Contact the
utility company for the actual rate schedules that apply
to your home.
Superior Features
of the 9212
Budgeting and Energy
Control Display
The 9212 gives you a continuous digital readout of both
the demand limit you have set and your actual demand.
Your actual demand may be displayed as instantaneous
demand, average demand, or your peak demand (similar to
what your meter records) over a period of time determined
by you. This information enables you to more accurately
set your demand limit, monitor your consumption and
budget for your future utility expenditures.
The 9212 displays the demand limit in .5 KW increments,
while instantaneous, average and peak modes display KW
in .1 KW increments.
Eight Separate Control
Points
High peak demand occurs when electrical loads are used
simultaneously. The 9212 can control up to sixteen individual electrical loads on eight separate control points,
usually air conditioning, heating circuits, the clothes dryer
and water heater - loads which can be turned off for brief
periods with little or no interruption of your lifestyle. On
the average, these loads are responsible for 60% to 80% of
your electrical consumption. With eight separate control
points, the 9212 provides maximum utilization of energy
within your chosen demand limit. That’s because the loads
which are turned on and off are smaller permitting a more
** Based on Black Hills Power Schedule RD-5 Demand
Rate, effective January 1, 2007. Does not include fuel
cost adjustment and taxes.
regular and even demand level.
4
Microprocessor for
Maximum Accuracy and
Reliability
Use of a microprocessor allows the 9212 to precisely
measure KW power demand and accurately compute the
average KW demand. In addition, by using a microprocessor, the 9212 can be tailored to the user's unique
reqirements by allowing virtually unlimited flexibility in
choosing load control strategies and minimum on/off
times.
Light and Sound Control
The 9212 lets you control the volume of the warning
alarm and the light intensity of the Control/Display Unit.
For example, you may wish to increase alarm volume
during the times when you will be away from the area
where the Control/Display Unit is mounted, or you may
wish to turn the alarm completely off. The light intensity
of the display can also be adjusted for maximum readability in different ambient lighting conditions.
EEPROM Non-Volatile
Memory for Maximum
Flexibility
Energy Sentry’s EEPROM memory “remembers” all
system settings you have entered even when power is
lost to your unit. In this way utility power interruptions
do not affect the settings in your 9212.
Choice of Load Control
Strategies
The choice of load control strategies, made possible by
the use of a microprocessor, offers unlimited flexibility as
to how loads may be controlled. This means the 9212 can
be adapted to almost any application, requirement or
user lifestyle.
The 9212's unique programming method allows the user
to assign a priority level from 1 through 8, to each control
point. For a Rotating Strategy, all control points are
programmed with the same priority level. For a Fixed
Priority Load Strategy, a different priority level is assigned to each control point. For Combination Strategies, fixed priority loads have a unique priority level
assigned to them and rotating loads of equal priority
have the same priority level assigned to them.
System
Your Energy Sentry 9212 Electrical Demand Controller
consists of three basic components: these include the
Control/Display Unit, the Relay Unit and the Current
Transformers. The systems diagram in Figure 3, page
15 of the installation section of this manual, shows how
these components are connected to control loads at the
load center. One circuit and controlled load is shown.
Your 9212 controls only those loads to which it is
connected. Typically, only deferrable loads such as
electric heaters, heat pumps, air conditioners, water
heaters and clothes dryer heating elements are controlled. These loads will vary depending on application
and should be listed in the space provided inside the
door of the Control/Display Unit and in the back of this
manual. If you are in doubt as to what loads are
controlled, you should ask the electrician who installed
your 9212.
The basic function of your 9212 in controlling these
loads is to keep the total electrical demand below a peak
value which is set according to your desired level of
comfort and minimum load requirements. Each of the
three components which make up the 9212 has a separate and unique function in accomplishing this task.
Description
Minimum On and Off
Times to Protect Heat
Pump and Air Conditioning
Compressors
All eight control points of the 9212 can be programmed
with minimum on and off times, each variable from zero
to 20 minutes. This feature allows the 9212 to be used
with heat pump and air conditioning motor loads by
providing compressor time delay protection.
Tamperproof Control
Settings
To protect against someone unintentionally increasing
your preset demand limit, the 9212 will only register a
demand limit setting change when two particular buttons
are held down together.
5
Control/Display Unit
The Control/Display Unit, mounted at a convenient
location within your home, contains the 9212’s microprocessor-based computer which automatically controls loads connected through the relays in the Relay
Unit. Commands to switch these loads originate here
and are based on the user-set demand limit and the
actual demand as measured by the Current Transformers. The way in which the loads are switched is based
upon the load control strategies programmed into your
unit according to your requirements. These strategies
will be discussed in more detail later.
If power is lost due to utility power interruptions, the
9212’s EEPROM non-volatile memory will remember the
demand limit that you have set as well as all other system
settings and will continue to perform demand control
within that limit when power is restored.
Figure 2. 9212 Control/Display Unit
Relay Unit
The Relay Unit, normally mounted near the load center,
contains up to eight power relays, capable of switching
16 electrical circuits, which turn the loads controlled by
the 9212 on and off. These relays get their commands to
turn on and off from the computer in the Control/Display
Unit by means of the connecting control cable shown in
Figure 3 on page 15.
Current Transformers
Two Current Transformers, usually mounted inside the
load center, monitor total electrical load. They tell the
computer in the Control/Display Unit how much
electricity you are using for all loads, not just those
controlled by the 9212. By monitoring the total load,
controlled loads may be turned on and off to keep total
demand below the limit you set.
System Operation
Control Panel Settings &
Displays
Figure 2 shows the front panel of the Control/Display
Unit. Each indicator and key serves a specific purpose
in providing you with the necessary information and
control needed to minimize peak energy usage. Each of
these indicators and keys have been numbered and are
described on the following pages.
KW Demand Limit (1): This indicator displays user-set
kilowatt demand limit in .5 KW increments. The value may
be changed from month-to-month depending on seasonal energy use requirements. Typical residential setting ranges are given in Table 2.
KW Demand Actual (2): This indicator displays total
household demand in .1 KW increments, which includes
both controlled and uncontrolled loads. Actual KW
demand may be displayed as Instantaneous, Average or
Peak, depending upon the desired display mode. See
display key (13).
6
Instantaneous KW Demand (3): When this mode is
selected, the Actual KW Demand display will indicate
Instantaneous Demand showing real-time changes in
demand of the total load as it occurs. This is useful for
determining how much energy is required to operate
various loads so that an understanding of your energy
requirements may be achieved. Your actual demand may
be compared to the typical residential appliance ratings
given in Table 3. The Instantaneous LED light will be on
when in this mode, as shown above.
Average KW Demand (4): In this mode, the Actual KW
Demand display will indicate your Average Demand over
a running 15, 30 or 60 minute interval depending on the
interval selected in the system programming mode. This
interval is the same as the demand averaging interval
used by your utility meter. Therefore the average demand shown on your 9212 is, approximately equal to
the demand level your meter is presently recording. The
Average LED light will be on when in this mode.
Peak KW Demand (5): In this mode the Actual KW
Demand display will indicate the highest actual average
(peak) demand-since-reset. This indicator is intended to
allow you to monitor your daily, weekly, or monthly
peaks in order to gain an understanding of how and when
these peaks occur. In this way, energy use patterns may
be modified, if desired, to minimize these peaks. It
should be noted that if this indicator is reset only when
the utility meter is reset, the value displayed should be
approximately the same as the reading on the meter. A
slight difference between the utility meter's peak and the
Peak KW Demand on the 9212 may be observed. This is
due to different demand averaging methods, varying
line voltages, power outages, measurement accuracy
and other factors. The utility meter will remain the final
determinate in your electric bill's demand charge. The
Peak LED light will be on when in the Peak KW Demand
mode.
Reduce Load (6): The Reduce Load indicator will come
on and the alarm buzzer will sound when all controlled
loads have been turned off, but instantaneous demand
is still above the limit. When this occurs, you must either
reduce uncontrolled demand (or increase the limit) as
suggested in the operating instructions. You will not
hear the alarm buzzer sound if the volume is set to OFF.
Circuits On (7): These LED indicators, when lit, tell you
which control circuits are enabled. A Circuits On
indication does not necessarily mean that the controlled
load is on, but rather the load is free to go on if the
thermostat calls for it.
Decrease Key (8): This key operates in conjunction with
the Demand Limit Key (10), Display Bright Key (11) and
the Buzzer Volume Key (12) and is used to decrease the
functions controlled by these keys.
Increase Key (9): This key operates in conjunction with
the Demand Limit Key (10), Display Bright Key (11)
and the Buzzer Volume Key (12) and is used to increase
the functions controlled by these keys.
Demand Limit Key (10): This key is used to set the
demand limit and is used in conjunction with the De-
crease Key (8) or Increase Key (9) and allows you to
adjust the demand limit up or down to the level which
best suits your particular energy requirements.
Display Bright Key (11): This key is used to adjust the
display brightness and is used in conjunction with the
Decrease Key (8) or Increase Key (9) to set the display
brightness for the best visibility under existing lighting
conditions.
Buzzer Volume Key (12): This key is used to control
the alarm buzzer volume in conjunction with the De-
crease Key (8) or Increase Key (9) and allows you to
adjust buzzer volume to meet various sound conditions.
Display Key (13): This key allows you to display Actual
KW Demand as an Instantaneous, Average or Peak
value.
Reset Peak Key (14): When in Peak Demand mode,
this key allows you to reset the highest average (peak)
demand recorded since reset, as described above. This
can be reset at any time and is for owner information
only.
Control Panel Instruction (15): These instructions,
printed on the front label of the Control Panel, instruct
you how to make all appropriate control settings.
Circuit Assignments (16): This space is used to
record the loads controlled by the 9212 and is filled in
using the load schedule supplied by the installing
electrician on page 31 of this manual.
Basic Operations
Your 9212 has been designed for ease of operation and
to provide efficient energy use. Please carefully read
the following instructions concerning basic system
operation as they will enable you to maximize efficient
energy use and minimize your electric bill.
Step 1, Turning On the Unit: Your 9212 should already
have been turned on by the installing electrician. If not,
there should be a breaker in your electrical load center
labeled “9212 Energy Sentry Demand Controller” or
similar. If this breaker is off, it should be turned on. If
you cannot locate a breaker labeled “9212,” you should
call your installing electrician.
Step 2, Setting Your Demand Limit: Please refer to the
Control/Display Unit pictured in Figure 2 for this and
all succeeding steps. To set demand limit:
1. Press and hold the Demand Limit Key (10).
7
2. Simultaneously press the Decrease Key (8)
or the Increase Key (9) until the desired
demand limit is reached. The numbers in
the Limit Display (1) will count up or down.
3. Release keys at the desired setting.
Because of the way you are billed by your utility company under the demand rate, you should change the KW
Demand Limit on your Control/Display Unit once a
month or seasonally as appropriate. For best results,
you should set the lowest practical demand limit within
the suggested range for your home or lifestyle. Typical
demand limit ranges, by month, for an average allelectric home are listed in Table 2.
Table 2. Typical KW Values by Month*
Summer Winter
Month (A/C) Area (Heating) Area
January 4–6 KW 7–10 KW
February 4–6 7–10
March 5–7 6–9
April 5–8 5–7
May 6–10 5–6
June 6–10 5–6
July 6–10 5–6
August 6–10 5–6
September 6–8 5–7
October 5–7 6–8
November 4–6 7–9
December 4–6 7–10
Settings will vary with lifestyle, home construction and
climate.
* Typical settings for heat pumps may be 10–40% higher.
Step 3, Monitoring Your Actual Demand: To select
Instantaneous, Average or Peak readout of Actual KW
Demand:
1. Press Display Key (13) once for each
display change desired.
2. The Actual KW Demand Display (2) will show
which mode - the Instantaneous (3), Average (4)
or Peak (5) mode - is being displayed and the
corresponding indicating LED light will confirm
the mode that is being displayed.
Step 4, Reset Peak: This step is optional depending
upon the time interval for which a record of your highest
average (peak) is desired. To reset peak:
1. Place Actual KW Demand display on the Peak
mode — (See Step 3).
2. Press and release the Peak Reset Key (14). A zero
will briefly be displayed in the Actual KW Demand
Display (2). This value will then jump to the
current average (peak) which becomes yous new
peak. As the average (peak) increases, the peak
demand will also increase and be recorded.
Step 5, Adjusting Display Brightness: Display brightness may be varied according to existing lighting conditions as follows:
1. Press and hold the Display Bright Key (11).
2. Simultaneously press the Decrease Key (8) or
the Increase Key (9) until the desired intensity is
reached.
3. Release keys at the desired display intensity.
Step 6, Adjusting Buzzer Volume: Buzzer volume may
be varied depending upon the desired alarm level as
follows:
1. Press and hold Buzzer Volume Key (12).
2. Simultaneously press the Decrease Key (8) or
the Increase Key (9). The buzzer will come on
and beep about 6 times at each volume level.
3. Release keys at the desired volume.
Note: If the user desires to turn off the Buzzer, hold the
Buzzer Volume and Decrease keys down until the
buzzer stops.
Step 7, If the Alarm Buzzer Sounds: The alarm buzzer
in your Control/Display Unit sounds and the Reduce
Load Indicator (6) will come on when the 9212 has done
all it can do to reduce your electrical demand and actual
demand is still greater than the demand limit. That means
all circuits that your 9212 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 with minimum on times 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 Table 3).
8
Table 3. Typical Residential Appliance Ratings
Stove: Large Burner 1.5-3 KW
Small Burner 1-1.4 KW
Oven or Broiler 5 KW
Self Clean (Bake &
Broil on together) 10 KW
Refrigerator 1.5-2 KW
Dryer 4.5-6 KW
Freezer 1.5-2 KW
Water Heater 3-6 KW
Lighting 0-1.4 KW
Dishwasher 1.2 KW
Waffle Iron 1.2 KW
Toaster 1.1 KW
Hair Dryer 1 KW
Room Air Conditioner 0.9 KW
Vacuum 0.7 KW
Blender 0.3 KW
Mixer 0.15 KW
Television 0.12-0.2 KW
(instant on is consumption 0.3 KW
continuously)
Central Air Conditioning 3-8 KW
(depending on home size)
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.
one minute. This strategy is particularly useful where
low priority loads may be turned off without significantly interrupting energy use requirements. Minimum
on and off times may be assigned to each circuit if
required.
Rotate Strategy: Under this strategy, all eight circuits
are assigned an equal (the same) priority, which turns off
loads sequentially every one minute as required to
maintain demand below the limit. Generally speaking,
the first load turned off will be the first one turned back
on in one minute intervals. In this way, off time of
rotating loads is minimized and roughly equal.
The Rotate Strategy is particularly useful where equal
priority rotation may serve several heating loads, minimizing the off time of each load during rotation. Thus,
the reduction in demand is shared by several loads and
the desired comfort level is maintained throughout
the home. Minimum on and off times, usually not
required under this strategy, may be assigned to each
circuit if required.
Combination Strategies: The 9212 allows the user to
program a priority independently for each control
level. One or more groups of rotating loads, with or
without fixed priority loads are possible. There are
virtually an unlimited number of possible combinations.
Changing Load Control Strategies: When your 9212
was installed, the strategy most appropriate to your
existing load requirements was selected. If your load
requirements have since changed, or if you would like
to change your load control strategy, refer to the
Installation section of this manual for detailed instructions or contact your Energy Sentry dealer.
Load Control Strategies
Your Model 9212 is a versatile electric demand controller offering a virtually unlimited number of load control
strategies, allowing you to maximize adaptability to
load requirements and user lifestyles. These strategies
include the Fixed Priority Strategy, the Rotate Strategy
and a wide range of Combination Strategies.
In addition to these strategies, all circuits may be assigned minimum on and off times, variable up to 20
minutes. This is a particularly attractive feature because
heat pump and air conditioning compressors requiring
time delay protection may be controlled under a
strategy to best fit your application, lifestyle or use
pattern.
Fixed Priority Strategy: When this strategy is selected,
up to eight circuits are turned on and off in order of
priority from 1 through 8, where loads controlled by
priority level 1 have the highest priority. Loads controlled by priority level 8 are the first off and the last
on. The on decision is made and implemented every
9
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Load Shedd ing Sequence
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When your total power consumption starts to exceed
the demand setting, the controller sheds the first load.
If necessary, additional loads will be shed to keep the
average demand below the demand setting. Loads are
shed according to the priority strategy selected: the
fixed priority strategy, the rotating strategy, or a combination, as described above. See the 9212 Installation
section of this manual for an explanation on how to
select the load control strategy.
The load shedding strategy selected is based on the
type of heating and cooling equipment and the design
of your house. If desired, the priorities may be easily
changed by you, your dealer or an electrician.
Chart A shows typical priorities for a house with
baseboard heating. Chart B shows priorities for a house
with heat pump/air conditioning.
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