Bacharach Microprocessor Module Replacement Kit User manual

3015-5550 Rev 21
621 Hunt Valley Circle
New Kensington, PA 15068 3015-5550
Tel: [phone] Revision 2
Fax: [phone] May 2013
Microprocessor Module Replacement
for Single-Zone Leak Monitors
Instruction Manual 3015-5550
1. Scope
This instruction manual describes how to replace or upgrade the microprocessor module in your “new style” Single-Zone
leak monitoring equipment (with serial numbers having the format “NU-xxxx”). It is assumed that you are familiar with the
operation of the appropriate monitor. If necessary, refer to the instructions for detailed operation and maintenance
information for each Single-Zone model.
The replacement process covers the following topics:
•Items Required
•Retrieving Current Configuration Data
•Preparation
•Microprocessor Module Removal
•Installing the New Microprocessor Module
•Configuration.
2. Items Required
•Replacement Microprocessor Module Kit (P/N: 3015-5549)
•Medium Phillips head screwdriver
•Medium standard slotted screwdriver
•Wrench for lock nut
IMPORTANT: Failure to comply with these instructions may void the warranty.
3. Retrieving Current Configuration Data
Your Single-Zone monitor has been configured for your specific installation. Prior to beginning this procedure it is highly
recommended to collect setup and configuration data from your monitor so it can be verified and (if necessary) reloaded
after the new microprocessor module is installed. Use the table in Section 7 to record current parameter settings.
NOTE: Note that a system hardware failure may make these values inaccessible or may reset them to default values
in a “fail safe” mode. If the values are not accessible or do not match your installation, you should skip this
step. If you need assistance, contact Bacharach Technical Support at [phone] or [phone].
4. Preparation
Prepare to remove the old microprocessor module by following the steps below.
a. Disconnect power to the leak monitor and confirm that no power is present.

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WARNING: Failure to remove power can cause damage to the monitor and can result in
personal injury or death.
b. Remove the two screws on the left edge of the front panel. See Figure 1 for locations.
Figure 1. Screw Locations on Single Zone Chassis
c. The front panel is hinged on the right side. Open the front panel and ground your body by touching an area of
bare metal inside the chassis.
WARNING: Failure to touch the grounding area can allow static electricity on your clothing or
body to damage the monitor or modules. Such damage is not covered under warranty.
d. Disable alarms to prevent accidental activation during this procedure.
e. Locate the microprocessor module, socketed on the bottom right side of the main circuit board. Refer to
Figure 2 and Figure 3.
Figure 2. Location of the Microprocessor Module
Screw
Locations

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f. Note the orientation of the module, specifically the gold tab and hole oriented on the bottom left of the board.
Refer to Figure 3.
Figure 3. Orientation of Microprocessor Module
5. Microprocessor Module Removal
Remove the installed microprocessor module by following the steps below.
a. Grasp the left and right edges of the microprocessor module and gently pull outward away from the main
board while rocking the microprocessor board left to right, until it comes free of the socket.
b. Dispose of the removed microprocessor module in accordance with local regulations for electronic equipment.
6. Installing the New Microprocessor Module
Install the new microprocessor module by following the steps below. Depending on your hardware and the replacement
kit that you receive, there are two different installation procedures. One method accommodates different hole sizes in the
microprocessor board and the mother board, and uses two screws (0001-1552) and a female-threaded spacer (0304-
8289). The other method accommodates the newer microprocessor board and mother board which have the same size
holes, and uses a snap-in spacer (0304-8459). Follow the installation option that corresponds to the hardware that is
supplied with your kit.
OPTION A: Threaded Spacer and Two Screws
a. Remove the main board from the enclosure by disconnecting all main board connectors, removing mounting
screws, and carefully lifting the main board from the enclosure standoffs. (Note that this and other steps may
not be required if your microprocessor board is already mounted as shown in Option A.)
b. Attach the threaded standoff to the top of main board by routing one of the screws up through the underside
of the main board and securing it to the standoff. Use Figure 3 as a guide.
c. Remove the new microprocessor module from its packaging, handling the board by the edges only.
d. Orient the new microprocessor so the gold tab and hole are at the bottom left corner (refer to Figure 3).
e. Carefully align the two rows of pins on the back of the processor with the mating socket on the main circuit
board in the Single Zone, then carefully press the microprocessor module firmly into the socket.
NOTE As a guide, align the larger hole on the microprocessor module with hole in the standoff.
CAUTION Be sure not to skip or offset the pins to the socket.
f. Feed the second securing screw through the hole in the processor board into the top of the threaded standoff
and secure it using the screwdriver. See the figure below.
Note Position of Gold Tab
and Hole (Bottom Left)

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Figure 4. Option A Installation
g. Re-attach the main board to the enclosure by carefully placing the main board onto the enclosure standoffs
and securing it with the screws removed earlier.
h. Re-attach only the main board connectors that you removed in step (a).
i. Continue with Step 7: Configuration
OPTION B: Snap-in Spacer
a. Insert the plastic snap-in spacer into the securing hole on the mother board. See figure below.
Figure 5. Option B Installation
b. Remove the new microprocessor module from its packaging, being careful to handle the board by the edges
only.
c. Remove all foam packing material from top and bottom headers.
d. Orient the new microprocessor so the gold tab and hole are at the bottom left corner (refer to Figure 3).
e. Carefully align the two rows of pins on the back of the processor with the mating socket on the main circuit
board of the Single-Zone, while simultaneously aligning the snap tab on the spacer with the hole in the
microprocessor board.
NOTE: As a guide, align the larger hole on the microprocessor module with the top of the snap-
in spacer. If aligned properly, the pins will align with the main board socket and the hole in the
microprocessor board will align with the top connector of the snap-in spacer.

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IMPORTANT: Be sure not to skip or offset the pins to the socket.
f. Ensuring that the pins are properly aligned and the snap-in spacer is in place and properly aligned, press the
microprocessor module firmly into the socket while simultaneously securing it to the snap-in spacer.
g. Continue with Step 7: Configuration
7. Configuration
Configure the leak monitor by following the steps below.
a. POWER-UP: Apply power to the leak monitor and wait for the power-up sequence to complete. Note that the
yellow fault light may flash at this time. The green power LED will flash to indicate that the monitor is in Warm
Up Mode. The monitor takes about 15 minutes to warm up; after which, the MONITOR ON light glows
steadily and the Data Display screen is displayed.
Figure 6. Startup, Warmup, and Data Display Screens
b. ACCESS FUNCTION SCREENS: Function screens are used to set up the monitor. After the microprocessor
board has been replaced, you must verify your monitor’s new configuration settings against the previous
settings that you collected in Section 3. With the monitor in Display Mode (solid green LED), access the
menu by pressing any keypad button.
c. COMPARE CURRENT AND SAVED SETTINGS: Use the keypad buttons to move the arrow (>) on the
display to highlight each function. Verify that the value of each function matches the previously collected
settings. (Refer to the table on the next page.)
Figure 7. Function Screens
d. EDIT SETTINGS AS NEEDED: If a setting needs to be changed, be sure that the desired function is
highlighted first (see previous step). With the desired function highlighted, you can edit the value by pressing
the ENTER button and then by using the keypad to scroll through the displayed data and change the value
associated with that function. Press ENTER to save newly entered values. Press the QUIT button to return to
the previous screen without saving.
NOTE If no buttons are pressed within 90 seconds after selecting a function, the monitor returns to the
Data Display screen.
Use the table below to enter pre-procedure settings and to confirm them after the new microprocessor board
is installed.
>SILENCE
ZONETMP
SQUELCH CAL
>P-CHK >PPM LOG
FAULTS
ALARMS
>LOG INT
AUDALRM
LOOP
>GASTYPE
SPILLVL
LEAKLVL
MEASURE 00485pk
0ppm R134A
WARM UP
BACHARACH
VERSION x.xx

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Setting Value

Description
GASTYPE Used to select of any one of the gas types listed for monitoring. Use the keypad to select the desired gas type, and then press ENTER to save the
selection and return to the previous screen.
LEAKLVL
Sets the Leak Alarm level, adjustable from 1 to 300 ppm. Factory default is
100 ppm. Note that the Leak Alarm level cannot be set higher than either the
Spill or Evacuate Alarm levels. Use the keypad to set the desired Leak
Alarm level, and then press ENTER to save that level and return to the
previous screen.
SPILLVL
Sets the Spill Alarm level, adjustable from no lower than the Leak Alarm
level to a maximum value of 500 ppm, but not higher than the Evacuate
Alarm level. Use the keypad to set the desired Spill Alarm level, and then
press ENTER to save that level and return to the previous screen.
EVACLVL Sets the Evacuate Alarm level, adjustable from no lower than the Spill Alarm level to 9999 ppm. Use the keypad to set the desired spill level alarm level,
and then press ENTER to save that level and return to the previous screen.
LOG INT
Sets the interval at which measurements are logged to memory from 1 to
9999 minutes. Factory default is 10
minutes. Note that the logged
measurements can be viewed using the PPM LOG function. Use the keypad
to enter the desired value, and then press ENTER to save that value and
return to the previous screen.
LOOP
Adjusts the loop factor of the 4–20 mA current loop. Factory default is 0.016
mA per ppm, which provides an output range of 0 ppm (4 mA) to 1,000 ppm
(20 mA). Use the keypad to set the desired loop factor, and then press
ENTER to save that value and return to the previous screen.
AUDALRM
Allows the monitor’s internal audible alarm to be associated with any
function of the monitoring system. Factory default is OFF. Use the keypad to
select the desired audible alarm function, and then press ENTER to save
that value and return to the previous screen. Values are:
•OFF
•ANY ALARM
•SYSTEM FAULT
•LEAK ALARM
•SPILL ALARM
•EVAC ALARM
•MONITOR STOPPED
NOTE: MONITOR STOPPED indicates there is a critical system fault, and
the monitor is no longer functioning correctly.
CLOCK
Sets the monitor’s date and time. Use the keypad to enter the correct date
and time, and then press ENTER to save those values and return to the
previous screen. Note that time is displayed in a 24 hour format, while the
date is displayed as mm/dd/yy.
SILENCE
Used to enter a length of time for which the internal audible alarm and the
external alarm are turned OFF when the front panel SILENCE button is
pressed. The factory default is 300 seconds (5 minutes). If the cause of the
alarm/fault has not been cleared at the end of this time period, the internal
audible alarm and the external alarm device are reactivated. Use the keypad
to enter the desired time period, and then press ENTER to save that value
and return to the previous screen.

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Setting Value

Description
SQUELCH
Sets a value of between 0.0 and 99.9 ppm that prevents the display of
measurements below that value. Factory default is 0 ppm. For example, if
the squelch setting is set to 50 ppm, then the monitor will not display
measurements that are below that value. Use the keypad to enter the
desired value, and then press ENTER to save that value and return to the
previous screen.
ZONETMP
Used to enter the temperature of the area being monitored in °C, thus giving
a more accurate ppm reading. The factory default is 25°C. Use the keypad
to enter the desired temperature, and then press ENTER to save that value
and return to the previous screen.
CAL Used to change the monitor’s calibration factor. This function is to be used
ONLY with instructions from a Bacharach Service Center.
P-CHK This Pressure Check function displays the current manifold pressure and the stored ambient pressure in psia, along with the difference between these
two pressures and the current fault code (if any).
e. After setting all of the parameters, press the CPU reset button on the bottom edge at the center of the main
circuit board. The monitor will restart to the desired values and enter the warm-up state.
Figure 8. Location of the CPU Reset Switch
f. After warmup is complete, confirm that there are no faults indicated.
g. Close the front panel and reinstall the panel screws.
∇∇∇

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Headquarters:
621 Hunt Valley Circle, New Kensington, PA 15068-7074
Toll Free: 1-800-736-4666 • Tel: [phone] • Fax: [phone]
Website: www.MyBacharach.com • E-mail: [e-mail]
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