Morrison 915 Series Manual

1
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
!
rev. 03-25-2020
The 915 Alarm Console is designed to provide a visible and audible alarm for above ground storage tanks. The
915 Series Alarm Console may be purchased to support either one or two 915 Sensors or any other Normally-
Open or Normally-Closed, dry contact inputs. The 915 provides two independent form single pole, double
throw (SPDT) relay outputs. Additionally, a dedicated output has also been provided for a Remote Horn with
Beacon (915HB) option allowing a visual and audible alarm to be located at a convenient remote location; two
of these devices may be daisy-chained. Two possible applications for the 915 series Tank Alarm are use as an
overll alarm or as low level alarm.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, re, explosion, serious
injury or death.
Contents
Specications.....................................................................................................................................2
Installation and Testing......................................................................................................................3
Mounting ...........................................................................................................................................3
Steps to Wire and Congure the 915 Tank Alarm Console ............................................................... 3
Operation ...........................................................................................................................................10
Use as an Overll Alarm .........................................................................................................11
Use as a Low Level Alarm ...................................................................................................... 11
Maintenance ..................................................................................................................................... 12
At the Beginning of Each Work Shift......................................................................................12
Yearly....................................................................................................................................... 12
Appendix A: DIP Switch Conguration Tables.................................................................................13
DIP SWITCHES......................................................................................................................13
CONNECTORS.......................................................................................................................13
Appendix B: Replacement Parts........................................................................................................13
915 Series Tank Alarm
Installation, Operation, and Maintenance Instructions

2
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Specications
IMPORTANT: Not approved for use in explosive atmosphere locations.
IMPORTANT: Install in accordance with all applicable local, state and federal regulations.
IMPORTANT: Never use with highly ammable liquids as dened by OSHA/GHS.
Description
The 915 Series Alarm Console is intended to be located in an Ordinary Location. Its inputs are NOT
intrinsically safe and are NOT intended for use with hazardous location. The inputs may be congured to
accommodate either Normally-Open or Normally-Closed dry contacts.
Output Contact Rating
48 VDC Maximum
0.5 Amps Maximum
Output Power Rating (available to each output)
12 VDC
0.4 Amps Maximum
Tank Alarm Input Power
Nominal Input Voltage: 12 VDC
Maximum Current Draw: 2 Amps
Maximum Power Consumption: 24 Watts
Operating Environment
-4°F to 104°F (-0°C to 40°C) to 100% humidity non-condensing
Indoor, Ordinary location only.
Maximum Wiring Distance
Maximum wiring distance between Alarm and input device is 500 ft.
Chemical Compatibility
The 915 Sensor is compatible with automotive uids such as:
• Oil
• Waste Oil
• Windshield Washer Fluid
• Diesel
• Transmission Fluid
• Brake Fluid
• Antifreeze
• B-20 (Biodiesel)

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
!
Installation and Testing
WARNINGS
• Any modication of this unit beyond what is outlined in this instruction will void product warranty.
• For your safety, it is important to follow local, state, federal and/or OSHA rules that apply to working
inside, above, or around the storage tank and piping area. Use all personal protective equipment required for
working in the specic environment.
• Install in accordance with all applicable local, state and federal regulations and codes.
• This device is intended to be used as an auxiliary warning to the operator of an abnormal condition of
the system, such as a possible overll situation and should not be the only system in place to prevent an
unwanted condition, such as preventing a tank from overlling. It is the sole responsibility of the operator to
continuously prevent any spillage regardless of the situation.
• In the event of malfunction, remove from service immediately and contact Morrison Bros. Customer Service.
Mounting
NOTE: This device is NOT intended to mounted at an outside location.
In order to prevent contamination from entering the enclosures, follow these instructions:
1. Mount the enclosures to a stable vertical surface using the mounting anges of the enclosure. Do not
make additional holes in the enclosure.
2. Morrison has provided an opening with wire gland in the bottom of the enclosure. All wiring should
enter and exit through this opening. Do not make additional openings in the enclosure.
3. Once the enclosure is securely mounted on a stable surface and the wiring is complete, place the
enclosure cover in the proper orientation on the enclosure base and secure in place by snugging each of
the cover screws. These are captured screws and are not intended to be removed. We have found it best
to partially thread each screw in place and then move from screw-to-screw to do the nal snugging of the
screws.
Steps to Wire and Congure the 915 Tank Alarm Console
Preparation
NOTE: The corner screws that hold the front cover in place are captive screws and are not intended to be
removed from the front cover.
Open the front cover of the Alarm Console by rst loosening the captive screws at each corner, then fully
unscrewing them. This allows the front cover to be carefully removed.
NOTE: The wires that connect the Alarm Console body (Beacon) to the main PCA on the front cover are
not intended to be used to suspend the front cover. Always support the front cover by some other means.
Figure 1—Connectors and DIP Switches on the
Tank Alarm

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Installation
Basic Connection Instructions
Most of the connections to the Alarm Console are made using the screwless connector block. Please follow the
connection instructions provided below when making connection to these connection blocks. See Figure 2 for
an illustration.
IMPORTANT: These connectors are rated to be used with 24AWG to 18AWG wire ONLY. All connections to
these connectors must adhere to these requirements.
Wire Preparation
1. Strip the wire to be connected to the connector 8mm/0.315inches.
2. Twist the strands of wire together.
Wire Connection
1. Fully depress the connector’s plunger using a suitable tool.
2. Fully insert the wire into the connector.
3. Release the connector’s plunger while maintaining the wire’s position in the connector.
4. Gently tug on the wire to verify that it has been captured by the connector
Console Power
The Alarm Console is powered by a single, wall mounted AC-DC Wall Adapter.
IMPORTANT: Do NOT plug in the wall adapter until the entire installation is complete including nal
inspection.
NOTE: Refer to “Basic Connection Instructions” for the following steps.
1. Prepare the ends of the two conductors that make up the wall adapter’s power cable.
2. Bring the AC-DC Wall Adapter’s cable into the console’s enclosure through the cable gland provided in
the bottom of the enclosure base.
Figure 2—Connecting wires to a screwless connector block
Figure 3—Power Adapter Cable’s White Stripe and the Tank Alarm
Console’s Power Connector
(+) (-)
3. Inspect the wall adapter’s cable and locate the conductor that has the white stripes on it (see Figure 3).
4. Connect the power cable conductor WITH the white stripes to pin two (2), the side labeled with a
MINUS sign (-) (see Figure 3).
5. Connect the other power cable conductor (WITH OUT the white stripes) to pin one (1), the side labeled
with a PLUS sign (+) (see Figure 3).

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Inputs
There are up to two independent inputs in the 915 Alarm Console depending on the model purchased. These are
individually congurable to work with sensors with either Normally-Open or Normally-Closed contacts.
Wiring
1. Run two 18 to 24 AWG oil resistant wires from each input device to the location where the Alarm
Console will be mounted. Enter the enclosure through the cable gland provided in the bottom of the
enclosure base. If a junction box is used, do NOT attach the wires of the input device(s) at this time. If
the input device is a Normally-Closed contact, connect the two wires together at the device end. If the
device is a Normally-Open contact, verify that the two wires are not connected to one another.
2. Remove the pluggable terminal block from the Alarm Console’s J1 to facilitate the wiring process.
NOTE: The wires are intended to exit the pluggable terminal block vertically from the circuit board.
The Channel Input Connector Insert the wire fully into the
connector & snug the screw.
Figure 4—Wiring the Channel Input Connector
Strip o about ¼ inch (5mm) of insulation from the wire and twist the
ends of the wire.
3. Connect the two wires from each input device to the two screw terminals for each channel input of the
Channel Input Connector (J1) for each Input. J1 pins 1 and 2 are channel 1 with pin 2 being the ground
reference. J1 pins 3 and 4 are channel 2 (if you are using a two channel version) with pin 4 being the
ground reference for the input.
4. Verify that each wire is securely held in the connector by gently tugging on them.
5. Plug the connector onto the Channel Input pins of the Alarm Console’s J1 with the wires vertical to the
PC Board.
Figure 5—INPUT connector J1

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Conguration
Outputs
There are two independent Output Channels available on the 915 Alarm Console. These outputs are a set of both
Normally-Open and Normally-Closed dry contacts (SPDT).
IMPORTANT: Do not exceed 48 Volts AC/DC and 500 mA current maximum.
In addition to these switch contacts, a current limited (400 mA), +12VDC power source is available to be used
with each output. The +12V power supply pin is connected with a jumper wire to the COM of each relay to
power the 915S or 915ST solenoid units. Remove this jumper if it is not required.
IMPORTANT: Do not place a load on this current limited output that exceeds 400mA. These are fused
outputs.
While the 915 Alarm Console is designed to accommodate many dierent possible applications, it was also
designed to interface to the Morrison Bros. Co. 915S (Solenoid without Timer) and 915ST (Solenoid with
Timer) devices. The wiring and conguration for these will be covered below.
The outputs have three possible conguration choices to be made. These will be covered in the
CONFIGURATION section to follow.
Figure 6—Conguring Input Mode with SW4 – Position 1 is
for Channel 1 and Position 2 is for Channel 2
Normally
Open
Normally
Closed
ON
Figure 7—OUTPUT connector, J2
Output Channel 1 Output Channel 2
+12 GND N.C. COM N.O. +12 GND N.C. COM N.O.
Position
SW4 Setting (see Figure 6)
ON OFF
1Congures input 1 for
Normally-Closed contacts
Congures input 1 for
Normally-Open contacts
2Congures input 2 for
Normally-Closed contacts
Congures input 2 for
Normally-Open contacts

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Wiring (see Figure 7 and Figure 2 for details)
The specic connections that need to be made to the output connector is highly dependent on the specic
application for the 915 Alarm Console. All connections for either Output Channel 1 or Output Channel 2 will
be made via the Alarm Console’s J2 connector. Instructions for making connections to this connector may be
found in Basic Connection Instructions, above.
NOTE: Refer to “Basic Connection Instructions” for the following steps.
The table below shows the pin connections for each output of the 915 Alarm Console. In addition, the
connections required for connecting a 915S or 915ST are shown. The pin connections of J1 are common to
both the 915S and 915ST.
*A jumper wire is installed between +12V and COM for each output, capable of providing +12VDC
current limited to 400mA.
Conguration
Each Output Channel has its own Conguration DIP switch. Output
Channel One uses SW2 and Output Channel Two uses SW3.
1. CHANNEL(s) TO RESPOND TO (positions 1 & 2)
Each OUTPUT may be congured to respond to either Input Channel
One or Input Channel Two or BOTH.
2. NORMALLY ACTIVATED/NORMALLY DEACTIVATED
(position 3)
When we say “NORMALLY” in this context, this means in the “non-
alarming condition.” When an Output is congured as NORMALLY
ACTIVATED, this means that if the power is applied to the Alarm Console AND there is no alarming
condition on the Input Channel that the output is supposed to respond to, then the relay itself will be
energized. In this position, the Normally-Open contacts of the Output are now Normally-Closed and
the Normally-Closed Contacts are Normally-Open. This conguration may be chosen as a failsafe
implementation in the case of a power failure.
NOTE: For the 915S and 915ST, verify that the Output Channel conguration is set for NORMALLY
ACTIVATED operation: DIP switch position three (3) is turned ON.
Figure 8—OUTPUT
Conguration DIP Switch
(SW2 shown here)
4
3
2
1
Position
SW2(OUT1)/SW3(OUT2) Setting
ON OFF
1 Responds to Channel 1 input Does NOT respond to Channel 1 input
2 Responds to Channel 2 input Does NOT respond to Channel 2 input
Position
SW2(OUT1)/SW3(OUT2) Setting
ON OFF
3 Normally Activated (failsafe) Normally Deactivated
Signal Name
915 915S/915ST
OUTPUT 1 OUTPUT 2 SOLENOID CONTROLLER
+12V J2 pin 1 * J2 pin 6 *
Power Return J2 pin 2 J2 pin 7 J1 pin 2
N.C. J2 pin 3 J2 pin 8
COM J2 pin 4 * J2 pin 9 *
N.O. J2 pin 5 J2 pin 10 J1 pin 1

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
3. PERSIST / NON_PERSIST (position 4)
An Output may be congured to remain active as long as the alarm condition continues to exist;
this is referred to as being Persistent. Conversely, you may desire the Output to remain active
only until the alarm condition has been acknowledged by pressing the Test/Cancel Button on the
front of the Alarm Console.
NOTE: For the 915S and 915ST, verify that the Output Channel conguration is set for PERSISENT
operation: DIP switch position four (4) is turned OFF.
Remote Horn with Beacon (915HB)
The 915 Alarm Console allows up to two Remote Horn with Beacon external alarms attached to a single
dedicated output. With a two Input Channel 915, this output may be congured to respond to Input Channel
One or Input Channel Two or BOTH. With a single Input Channel 915, this output may be congured to either
respond to or not respond to Input Channel 1 only. The Alarm Console connector associated with the 915HB
Remote Horn with Beacon is J6, located in the center of the main PC board.
Wiring (see Figure 2 for details)
NOTE: Refer to “Basic Connection Instructions” for the following steps.
The table below shows the pin connections required for connecting a 915HB to the dedicated output of the
915 Alarm Console.
Figure 9—Conguring Remote Horn with Beacon output with SW4 – Position 3
selects Input Channel 1 and Position 4 selects Input Channel 2
ON
Conguration
Conguration consists of choosing which input the Remote Horn with Beacon is going to respond to. With the
single channel 915 Alarm Console it is a choice of either responding to or not responding to the single channel
(Input Channel 1). With the two channel 915 Alarm Console, it is a choice between either responding to Input
Channel One, Input Channel Two or both.
Position
SW4 (Remote Horn with Beacon) Setting
ON OFF
3 Responds to Channel 1 input Does NOT respond to Channel 1 input
4 Responds to Channel 2 input Does NOT respond to Channel 2 input
Position
SW2(OUT1)/SW3(OUT2) Setting
ON OFF
4 Persist Non-persist
915HB 915
J1 pin 1 J6 pin 1
J1 pin 2 J6 pin 2
J1 pin 3 J6 pin 3
J1 pin 4 J6 pin 4

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Auto-Silence Feature
The 915 Alarm Console has the capability of silencing itself after 10 minutes in the case of an alarm condition.
“Silencing itself” means that the Horn/Buzzer ceases to sound; all visual alarms will continue to be active until
either the alarm condition ceases, or the alarm condition is acknowledged by pressing the Test/Silence button on
the front of the Alarm Console.
Alternatively, you may choose to have the Horn/Buzzer continue to sound until either the alarm condition
ceases, or the alarm condition is acknowledged by pressing the Test/Silence button on the front of the Alarm
Console.
Completion
1. Inspect all of the wiring to verify that it has been done properly. Correct any discrepancies and re-
inspect.
2. When the installation has passed inspection, reinstall the front panel of the Alarm Console.
a. Place the front panel on the enclosure base being careful to orient the panel in the upright position,
carefully folding the wires into the enclosure.
b. Partially thread in the four screws that hold the front cover in place.
c. Verify the proper seating of the cover.
d. Snug the four screws in place.
IMPORTANT: Do NOT apply power to the 915 or any of the system components until the entire installation
is complete and the wiring has passed nal inspection.
Testing
Testing the system should only be performed after the entire system has been inspected, verifying both the
wiring and the conguration.
NOTE: When power is rst applied to the Alarm Console, the Beacon on top of this console and the
Beacon(s) on any Remote Horn with Beacon should go through a quick “hello” ash, demonstrating that it
is powered up and ready.
Power Up Verification
Apply power to the system by plugging in each of the AC-DC Wall Adapters.
Verify that:
• The Beacon on the 915 Tank Alarm Console does its quick flash.
• The Beacon on any Remote Horn with Beacon units also does their quick flash.
• The GREEN Power Indicator is brightly illuminated on the front panel of the 915 Tank Alarm
Console.
• The RED Channel Alarm Indicators on the 915 Tank Alarm Console are not blinking or
illuminated.
• The Horn/Buzzer on the 915 Tank Alarm Console is silent.
• The Horn/Buzzer on any Remote Horn With Beacon units are also silent.
• The GREEN Active Indicator on each 915S and/or 915ST unit(s) associated with the system
are brightly illuminated.
Position
SW4 (Auto-Silence) Setting
ON OFF
5
The audible alarm will
automatically silence after
10 minutes of alarming.
The audible alarm will continue to
sound until either the alarm condition
ceases to exist, or the alarm condition
has been acknowledged by pressing the
Test/Silence button on the front panel.

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
915‑‑‑0142 PP
rev. 03-25-2020
Solenoid Output Verification
915S (if installed):
Ensure all proper connections are made with downstream air activated device.
Verify that:
• The downstream air activated device is fully functional.
915ST (if installed):
1. Set the Timer for 1 minute run time by turning the dial to the 1.
2. Press and release the Start/Stop button in the front panel of the 915ST.
Verify that:
• The Active Indicator now blinks … about one second on, one second off.
• The downstream air activated device is fully functional
3. Wait for the one minute then
Verify that:
• The ACTIVE Indicator stops blinking.
• The downstream air activated device is no longer functional.
Channel Alarm Verification
The following test should be performed on each Input Channel:
1. If the input device utilizes Normally-Open contacts, then connect the two wires together at the tank. If
the input device utilizes Normally-Closed contacts, then disconnect the two wires at the tank.
Verify that:
• The Channel indicator associated with the channel is blinking
• The Horn/Buzzer is sounding
• The Beacon is illuminated
• The Output Devices associated with the channel are in their alarm condition
EXAMPLE: If the channel is associated with Morrison Bros. Co. 915S or 915ST Solenoid unit(s),
the GREEN Active light should be extinguished
2. Acknowledge the alarm by pressing the “Test/Cancel” button on the front of the Solenoid Valve Unit.
3. Remove the alarm condition at the tank.
4. Connect the two Tank Sensor wires to the Tank Sensor
5. Simulate an alarm condition by moving the Tank Sensor oat into the alarming position
Verify that:
• The Channel indicator associated with the channel is blinking
• The Horn/Buzzer is sounding
• The Beacon is illuminated
• The Output Devices associated with the channel are in their alarm condition
EXAMPLE: If the channel is associated with Morrison Bros. Co. 915S or 915ST Solenoid unit(s),
the GREEN Active light should be extinguished.
6. Acknowledge the alarm by pressing the “Test/Cancel” button on the front of the Solenoid Valve Unit.
7. Remove the alarm condition at the tank.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, re, explosion, serious
injury or death.
Operation
The 915 Alarm Console may be used in applications where one to two sets of Normally-Open or Normally-
Closed dry contacts are available. Two possible applications are used as an overll alarm or as a low level
alarm. These two uses are addressed below.
Use as an Overll Alarm
Use with the Morrison Bros. Co. 915 Tank Sensor or other similar input device.
1. At the beginning of each work shift press and hold the Test/Cancel button on the front of the 915 Alarm
Console for more than 3 seconds.
!