Garnet 709-RVC NLP User manual

IMPORTANT OPERATOR INFORMATION
DATE INSTALLED:_____________________________________________________________
SERIAL NUMBER: _____________________________________________________________
Signal Level Sender Height
Black Water Tank
Grey Water Tank
Fresh Water Tank
RV Tank Monitor
MODEL 709-RVC NLP
MANUAL
CANADA
Garnet Instruments
286 Kaska Road
Sherwood Park, AB T8A 4G7
USA
Garnet US Inc.
5360 Old Granbury Road
Granbury, TX 76049

Page 2 709-RVC NLP Manual
Table of Contents
CHAPTER 1 - OVERVIEW.............................................................................................3
CHAPTER 2 - SYSTEM DESCRIPTION .....................................................................4
CHAPTER 3 - OPERATING INSTRUCTIONS ..........................................................6
CHAPTER 4 - DISPLAY CALIBRATION.....................................................................8
CHAPTER 5 - SENDER PROGRAMMING ............................................................. 12
CHAPTER 6 - INSTALLATION GUIDE..................................................................... 16
CHAPTER 7 - TROUBLESHOOTING GUIDE......................................................... 24
CHAPTER 8 - SPECIFICATIONS ............................................................................... 32
CHAPTER 9 - SERVICE AND WARRANTY INFORMATION............................ 33
GARNET
SEELEVEL II TM
Tank Monitor
MODEL 709-RVC NLP
709-RVC NLP Manual_v7.1 - 23-Sep-2022
WCAUTION: explains safety information that could cause damage to the
product, including data loss.
WWARNING: explains dangers that might result in personal injury or death.
WNOTE: expands on information for any procedures.
SAFETY SYMBOLS INFORMATION
“Notes”, “Cautions”, and “Warnings” have been used throughout this manual to
bring special matters to the immediate attention of the reader.

Page 3
709-RVC NLP Manual
The SEELEVEL II TM Tank Monitor represents a massive leap forward in level measurement technology for the Recreational
Vehicle industry. The SeeLeveL has a combination of features,
accuracy, reliability, and diagnostic capability that have never
been available before.
Model 709-RVC NLP will monitor the battery voltage and the fresh
water and sewer holding tanks. The 709-RVC NLP is also RV-C
network compatible, the tank levels and alarms are available on
the RV-C bus for the fresh, grey and black tanks. The information
is displayed on a 3-digit alpha-numeric LED display. There is
one alarm output available which can be used to signal a high or
low water or sewer level as required. In addition, the system can
display the operating characteristics of each of the tank sending
units, giving it unsurpassed diagnostic capability.
CHAPTER 1 - OVERVIEW
W WARNING: All power circuits must be fused. If a fuse is not
provided with the system then it is the installer’s responsibility to
install a fuse with a maximum rating of 7.5 amps.
For more detailed information please refer to Chapter 7
“TROUBLESHOOTING GUIDE” and section “How to avoid
damaging the display or pump switch due to excessive current”.

Page 4 709-RVC NLP Manual
The SeeLeveL consists of a display unit that mounts inside the RV, and sender panels that stick to the side of the holding tank. A
single 2 conductor wire is used to connect all the sender panels to
the display.
The Sender: Each sender panel is a exible self-adhesive printed
circuit board which is adhered to the side of the holding tank. The
sender panel can be cut to length to match the height of the tank, and
it auto calibrates itself so that it can read from Empty to Full regardless
of the height of the tank. The sender scans the water level through
the tank wall using advanced digital techniques programmed into
the sender microprocessor. When the sender transmits the water
or sewer level information to the display, it sends a digital code that
has built in error detection, making it highly unlikely for the display
to read an incorrect level, even if the wiring is marginal. In addition
to the level, the sender also transmits diagnostic information about
its operation. This information can be used to determine if there
is buildup of sludge on the inside of the tank, or to determine if
the sender is damaged or delaminating from the side of the tank. If
sludge buildup in the tank becomes extreme the gauge will cease to
operate properly, so by monitoring the signal power the tank can be
cleaned before the buildup gets excessive. Three dierent sender
options (710JS, 710ES, and 710SS) and the ability to double stack
the senders provide accurate level measurement for tank heights
ranging from 4½” to 34”.
The Display: The display receives the information from the three
sender panels via a single 2 conductor wire, and displays the level
information in percent of full on a 3-digit LED display. When the
button for a particular tank is pressed, the display shows the level for
that tank. If the button is pressed and released, the display will show
the level for about 5 seconds and then shut down automatically. If
another button is pressed before the display shuts down, then the new
level will immediately be shown. If the same water or waste button
is pressed twice, the display will hold on that tank and continue to
show updated levels for 5 minutes before shutting o. This allows
the user to monitor the lling or draining of a tank. By pressing two
buttons at once, the diagnostic functions can be accessed; these are
described in detail in the troubleshooting chapter.
CHAPTER 2 - SYSTEM DESCRIPTION

Page 5
709-RVC NLP Manual
If a sender is operating properly and connected to the display with
good wiring, then the display will show the level normally. If the
wiring is disconnected, shorted, or cut, or if the sender panel is
defective, then the display will indicate an error code. The various
error codes are shown in the troubleshooting chapter.
With these diagnostic features and the digital nature of the tank
level sensing technology, it is almost impossible for the system
to indicate an incorrect water level, and in the very unlikely
event it does occur, servicing is greatly aided with the diagnostic
information.
The system also shows the RV battery voltage by measuring the
voltage which powers the display. The voltage is shown with a
resolution of 0.1 volt.
In order to keep the tank level and alarm information on the RV-C
bus current, the display regularly scans the senders every 10-15
seconds. When a tank button is pressed, the information displayed
is recalled from the most recent scan. A tank on hold is scanned
more frequently. Systems with two displays are congured so
that the primary display initiates the scanning and the secondary
display passively listens to the sender information, this way both
displays stay updated without interfering with each other.
The single common alarm output can be programmed to indicate
a high or low sewage level or a high or low water level. More than
one alarm can be assigned to the alarm output. This output can
be connected to an indicator light and used to show a high sewer
level and/or a low water level, alerting the user that attention is
required. Another example is the alarm could be used on the
black tank to prevent toilet use when the tank is full.

Page 6 709-RVC NLP Manual
The display is the only system component that is accessed by the user. All user input to the display is done using the ve
buttons along the bottom of the display. Operation of the display
is as follows:
To read a water or sewer tank level:
1. Press the button corresponding to the tank to be checked and
release it, the display will show the level in percent on the LED
display. If no other button is pressed, then the display will
shut o after about 5 seconds.
2. If another button (including BATT) is pressed before the
5 second time is up for the rst button, the display will
immediately switch to showing the new level or voltage. The
5 second timeout is restarted every time a button is pressed.
3. To continuously display a reading, press and release the
desired button, and then press the same button a second
time. When the button is released, the display will be in hold
mode, which is indicated by the decimal point on the right
hand side turning on. While the display is in the hold mode
it will recheck the held level every 2 - 3 seconds so the user
can watch the level change while the tank is being lled or
drained. The other tanks will continue to be scanned every
10 - 15 seconds. The display will automatically shut o after
5 minutes in hold mode. To end the hold mode before the 5
minutes is up, press any tank button, and the display will shut
o.
To read the battery voltage:
1. Press the BATT button and release it, the display will show the
battery voltage on the LED display.
2. If no other button is pressed, then the display will shut down
after about 5 seconds. If the BATT button is held down,
the display will continuously recheck the voltage and show
the updated value. The reading may icker back and forth
between two values, for example, 12.6 and 12.7 volts. This is
normal behavior for a digital voltage display.
3. If another button is pressed before the 5 second time is up
for the BATT button, the display will immediately switch to
showing the value for the new button. The 5 second timeout
is restarted every time a button is pressed.
4. There is no hold mode for the battery voltage.
CHAPTER 3 - OPERATING INSTRUCTIONS

Page 7
709-RVC NLP Manual
RV-C Bus Communication:
RV-C is a communications protocol based on CAN that is used for
control, coordination, and diagnostics.
Note: Anyone that intends on
connecting to the RV-C bus
should have a knowledge of
the RV-C specication. For
more information on RV-C
protocol go to: http://www.
rv-c.com
The sensors use a default
source address of 72 and
SPN-ISB instances are 0 for
fresh, 1 for black, 2 for grey.
1. By changing the FRESH/GREY/BLACK to zero senders, you
are disabling that sender’s updates over the RV-C bus as
well.
2. The primary display has priority over the RV-C bus to check
levels. The secondary display will wait until the primary
display releases the bus before getting level readings.
3. The RV-C has a 4-pin connector as shown in the red box.
The connector pins conform to the RV-C standard.
4. Some displays have a wired connection as shown in the
red box in the image below. If this is what your display has,
connect the wiring according to the following table.
Wire colour Function
Black Ground
Blue CAN Low (-)
White CAN High (+)

Page 8 709-RVC NLP Manual
To program the LED brightness:
1. If the display is to be used inside the coach, the LED brightness
should be low. If it is to be used in the service bay area where
sunlight can reach it, the LED brightness should be high.
2. To program the LED brightness, the display needs to enter
the brightness programming mode. To do this, press and
hold down the BATT button, the display will show the battery
voltage.
3. While continuing to hold down the BATT button, press and
hold down the GREY button. Continue to hold down both
buttons for about 5 seconds until the display shows “bri”
to indicate the brightness programming mode. When this
occurs release both buttons.
4. The display will now indicate the brightness that is currently
programmed by showing “b-1”, “b-2”, “b-3”, or “b-4”, where
“b-1” is the minimum brightness and “b-4” is the maximum
brightness.
5. Press the GREY tank button to increase brightness, or the
FRESH tank button to decrease brightness.
6. When the display shows the correct brightness, press the
BATT button to exit the programming mode.
To program the number of senders for each tank:
1. To program the number of senders for each tank, the display
needs to enter the sender programming mode. This should
only be done at the time of installation; there is no reason
to change the number of senders afterward. Make sure that
the number of senders programmed into the display matches
with the number of senders connected; otherwise the display
will show an error.
2. To enter the sender programing mode, press and hold the
button for the tank to be programmed, the display may show
a level or an error message for that tank.
3. While continuing to hold down the button for the tank, press
and hold the BATT button. The display will immediately show
”dIA” (diagnostics), continue to hold down both buttons until
the display enters the programming mode, this should take
about 10 seconds.
CHAPTER 4 - DISPLAY CALIBRATION

Page 9
709-RVC NLP Manual
4. When the programming mode is entered, the display will
show “FrS” if entering the number of senders for the fresh
tank, “GrS” if entering the grey tank, or “bLS” if entering the
black tank. When this occurs release both buttons.
5. The display will now show “0SE” (zero senders/disabled),
“1SE” (one sender) or “2SE” (two senders), based on what is
currently programmed into the display. These are the only
three options; the display will not work with more than two
senders per tank.
6. To change the number of senders, press the tank button, each
time the button is pressed the display will increment one
number.
7. When the display shows the correct number of senders, press
the BATT button to exit the programming mode. Each tank
will need to be calibrated individually using this procedure.
To program the alarm set points for each tank (FRESH/GREY/
BLACK):
1. To program the alarm point for each tank, the display needs
to enter the alarm programming mode.
2. To enter the alarm programming mode, press and hold down
the button for the tank to be programmed, the display may
show a level or an error message for that tank.
3. While continuing to hold down the button for the tank, press
and hold down the BATT button. The display will immediately
show ”dIA” (diagnostics), continue to hold down both buttons
until the display enters the alarm test menu, this should take
about 5 seconds.
4. When the alarm test menu is entered, the display will show
“ALr” for about 5 seconds. Release the buttons.
5. Depending on which tank is selected and the status of the
alarm, the display will show a simulated low uid level below
the alarm set point (FLo, GLo, bLo) or a high level above the
alarm point (FHi, GHi, bHi). The alarm test menu allows the
alarms to be manually activated to test. The same tank button
toggles the simulated uid level between low and high.
6. To set the alarm point, press and hold the same tank button,
after about 3 more seconds, the display will show “FAS”,
“GAS”, or “bAS”, depending on which tank is selected. Release
the button.

Page 10 709-RVC NLP Manual
7. To set the alarm point, the GREY button increases the value,
the FRESH button decreases the value, and the BLACK
button cycles through the trip polarity and the inclusion in the
common alarm output. The BATT button saves and returns
to the previous menu. The alarm point can be from 0% to
99%. If the FRESH or GREY buttons are held down, after 1
second the numbers will change quickly.
Trip Polarity: While the BLACK button is held down, the display
shows “Hi” on the left for a high level alarm or “Lo” for a low level
alarm. After the button is released, the left digit shows “H” for a
high level alarm which means the alarm turns on (closes) when the
uid level is equal to or higher than the set point, and the alarm is
o (open) when the uid level is below the set point. An “L” shows
a low level alarm which means the alarm turns on (closes) when
the uid level is below the set point, and the alarm is o (open)
when the uid level is equal to or above the set point.
Inclusion in the Common Alarm Output: While the BLACK
button is held down, the display shows an “i” on the right if the
alarm is included and an “n” if not included. After the button
is released the decimal on the right indicates that the alarm is
included in the common alarm output. If any of the included
alarms are on, then the common alarm is on. All of the included
alarms must be o for the common alarm to be o.
To program the display as primary or secondary:
An optional second display can be added to the system. This allows
for a display in the service bay and one inside the coach. To avoid
reading errors when using dual displays, one display needs to be
set to secondary mode. A display in secondary mode monitors
the primary displays sender requests and will only scan the tank
levels at a much slower rate if the primary display is disconnected.
The alarms are inactive on the secondary display.
To program a display to be either primary or secondary display:
1. Press and hold the BATT and FRESH buttons while powering
up the display.
2. The display will show “Scn” for 5 seconds, then change to
“SEC” or “Pri” depending on current programming.
3. The FRESH button sets the mode to PRIMARY, the GREY
button to SECONDARY and the BATT button saves and exits.
W NOTE: The battery voltage is calibrated at the factory; this
should never need to be changed.

Page 11
709-RVC NLP Manual
To check the primary/secondary mode:
1. Press and hold down the BATT button, the display will show
the battery voltage. While continuing to hold down the BATT
button, press and hold down the BLACK button. Continue to
hold down both buttons for about 5 seconds until the display
shows “Pri” for primary mode or “SEC” for secondary mode.
When viewing is complete, release both buttons to return to
normal operation.
To check the hardware and software revision:
1. Hardware and software updates may be periodically released
to add features. To check the hardware and software version
of the display, use the following procedure.
2. Press and hold down the BATT button, the display will show
the battery voltage. While continuing to hold down the BATT
button, press and hold down the FRESH button. Continue to
hold down both buttons for about 5 seconds until the display
shows a number such as “4.10”, the rst number is the
hardware version and the last two numbers are the software
version. When viewing is complete, release both buttons to
return to normal operation.

Page 12 709-RVC NLP Manual
CHAPTER 5 - SENDER PROGRAMMING
To program the 710ES or 710SS sender for the correct tank:
1. Since the senders are all connected in parallel to save wiring
and to simplify installation, the senders must be programmed
so they know which tank they are on. The senders can be
programmed for either the fresh, grey, or black tank. This is
done with the two tabs on the top corners of the sender. See
the following diagram.
2. The senders default to fresh tank operation if the programming
is not altered. Consequently, if the sender is for the fresh
tank, nothing further needs to be done to it.
3. If the sender is for the grey tank, remove the tab that says
“GRY” next to it.
4. If the sender is for the black tank, remove the tab that says
“BLK” next to it.
5. This is all that is required to program the senders for the
correct tank. However, if you make an error, you have one
chance to correct it, as described below.
6. If the “GRY” tab has been removed and it should be a black
tank sender, or if the “BLK” tab has been removed and it
should be a grey tank sender, then cut out the recessed grey-
black correction tab that says “GBC” next to it. This reverses
the eect of the grey and black tabs.
7. If either the “GRY” or “BLK” tabs have been removed and it
should be for a fresh tank, then remove the other “GRY” or
“BLK” tab. When both the “GRY” and “BLK” tabs are removed,
it is equivalent to neither of them being removed.
8. If the sender is single, no further programming is required.
9. If double stacked senders are used, the top sender must have
additional programming, as described below.
10. Refer to the 710ES and 710SS sender programming diagram.
To program the 710ES or 710SS sender as top or bottom:
1. Since the senders are all connected in parallel to save wiring
and to simplify installation, the senders must be programmed
so they know whether they are a single, top, or bottom sender.
This is done with the tab at the top center of the sender. See
the following diagram.

Page 13
709-RVC NLP Manual
2. The senders default to single or bottom operation if the
programming is not altered. Consequently, if the sender is
for single or bottom operation, nothing further needs to be
done to it (beyond programming it for the correct tank).
3. For a top sender, remove the tab that says “TOP” next to it.
4. This is all that is required to program the senders for single,
top, or bottom use. However, if you make an error, you have
one chance to correct it, as described below.
5. If the “TOP” tab has been removed and it should be a single
or bottom sender, then cut out the recessed top correction
tab that says “TC” next to it. This reverses the eect of the
top tab.
6. Verify that both the top and bottom senders have been
programmed for the correct tank.
To program the 710JS sender for the correct tank:
1. Since the senders are all connected in parallel to save wiring
and to simplify installation, the senders must be programmed
so they know which tank they are on. The senders can be
programmed for either the fresh, grey, or black tank. This is
done with the two tabs on the top corners of the sender. See
the following diagram.
2. The senders default to fresh tank operation if the programming
is not altered. Consequently, if the sender is for the fresh tank,
nothing further needs to be done to it.
3. If the sender is for the grey tank, remove the tab that says
“GRY” next to it.
4. If the sender is for the black tank, remove the tab that says
“BLK” next to it.
5. This is all that is required to program the senders for the
correct tank. However, if you make an error, you have one
chance to correct it, as described below.
6. If the “GRY” or “BLK” tab has been removed by mistake, the
sender can be changed to a fresh tank sender by cutting the
other corner tab (“BLK” or “GRY”).
7. Refer to the 710JS sender programming diagram.

Page 14 709-RVC NLP Manual
710ES AND 710SS SENDER PROGRAMMING

Page 15
709-RVC NLP Manual
710JS SENDER PROGRAMMING

Page 16 709-RVC NLP Manual
CHAPTER 6 - INSTALLATION GUIDE
1. Please refer to the “Troubleshooting and Installation Tips”
section in Chapter 7 for details on avoiding installation issues.
2. The installation consists of mounting the display inside the
RV, cutting and fastening the senders to the sides of the
holding tanks, connecting wiring, and programming the
display. When wiring DO NOT use spade connectors to join
wires, only use crimp on butt connectors or solder the wires
together.
3. Mount the display by cutting a hole in the wall 3” wide by 1 ⁄”
high and bringing the wiring out through the hole to connect
to the display panel connector.
4. Connect the wiring according to the following table. It is
easier to connect the wiring to the display connector rst,
and then plug the connector into the display panel. The
senders need to be grounded to a single ground wire from
the display. Make sure that the system ground is connected
to the breaker panel ground.
5. Determine where to mount the senders on the tanks. They
will need to have a at area on the side of the tank large
enough so the whole width of the sender is in contact with
the side of the tank, all the way from the top to the bottom
of the tank. Make sure that any metal is at least 1” away from
either side or the top and bottom of the sender, and at least
2” away from the face of the sender. Clean the area well
so that there is no dust, grease, oil, water, etc., that would
prevent the adhesive on the sender from sticking.
6. Measure the height of the tank to determine which sender
W CAUTION: DO NOT mix sender types when stacking senders.
Wire Colours on Connector
Wire Color Function
Red 18 gauge +12V
Black 18 gauge Ground
Blue 18 gauge Tank Senders
Purple 18 gauge CAN-Hi
Yellow 18 gauge CAN-Lo

Page 17
709-RVC NLP Manual
conguration to use and how long the senders should be.
Refer to the following table.
Tank
Height
Sender Options
Best Resolution Other Acceptable
4½” - 5” JS -
5” - 7” JS ES
7” - 13” ES SS
13” - 17” stacked ES SS
17” - 25” stacked ES stacked SS
25” - 34” stacked SS -
For single sender applications:
The sender ends should be ¼” to ¾” away from the top and
bottom of the tank, to allow for the thickness of the tank top and
bottom and any bows in them (see the diagrams). The senders
are calibrated to account for this distance from the bottom of the
tank. The SS sender is cut to the nearest even 2” in length. The
ES sender is cut to the nearest even 1.5” in length, for example,
for a system with a tank height of 11.75”, cut the sender to be
10.5” long, this allows ⁄” at each end when the sender is centered
vertically on the tank. The JS sender is cut to the nearest 1.0” in
length. IMPORTANT: DO NOT cut the 710SS sender shorter than
6”. This sender will not work if it is cut shorter than 6”. DO NOT
cut the 710ES sender shorter than 4½”. This sender will not work if
it is cut less than 4½”. DO NOT cut the 710JS sender shorter than
4”. This sender will not work if it is cut less than 4”.
For double stacked sender applications:
For tall tanks, two stacked 710ES or 710SS senders are used. The
sender ends should be ¼” to ¾” away from the top and bottom of
the tank, to allow for the thickness of the tank top and bottom and
any bows in them (see the diagrams). The senders are calibrated
to account for this distance from the bottom of the tank. In
addition, there needs to be a gap of ⁄” to ⁄” in between the
two senders. Therefore the total length of both senders will be:
tank height -¼”-¼”-⁄”, then rounded down to the nearest 1.5” (ES
sender) or 2” (SS sender) . The top and bottom senders should be
approximately the same length for best results. For example, if the
tank height is 22”, then 22”-¼”-¼”-⁄”= 21 ⁄”, so the total length

Page 18 709-RVC NLP Manual
710ES AND 710SS SENDER

Page 19
709-RVC NLP Manual
710JS SENDER

Page 20 709-RVC NLP Manual
of both ES senders will be 21”. Make both senders 10.5” long.
7. To make the senders the right length (assuming they are too
long) they will need to cut o with a pair of scissors. The end
to be cut is the bottom end, which is the opposite end from
the top where the wires come out (see the diagrams).
8. The senders need to be programmed so they know which tank
they are on. This is done by selectively cutting o the tabs
on the top of the sender. See the chapter entitled “SENDER
PROGRAMMING” for details.
9. For double stacked sender systems, the senders also need to
be programmed so they know whether they are being used
as top or bottom senders. See the chapter entitled “SENDER
PROGRAMMING” for details.
10. Once the sender is cut to length and programmed, do a test
by taping the sender to the tank wall. Make sure there are no
air gaps between the sender and the tank. Verify operation
before permanently sticking the sender to the tank wall.
Once proper operation has been conrmed, carefully peel the
backing paper o the adhesive. Do this slowly to prevent the
adhesive from being ripped o the sender, and to prevent
the backing paper from ripping. Be careful not to bend the
sender sharply in the process. Position the sender over the
side of the tank and carefully stick it down.
Position the bottom of the sender at least ¼” above the
bottom of the tank, or slightly higher if required to equalize
the space at the top and bottom of the tank. Make sure that
the sender is square with the tank. You only have one shot
at this, if you try to peel it o the tank once it is stuck the
sender may be damaged by the sharp bending. Carefully
press the sender down to the tank so that all of the adhesive
is contacting the tank wall.
11. Do steps 5 to 10 for the other two holding tanks.
12. Connect all the blue wires from the senders together, and to
the blue wire from the display. Connect the black wire from
WCAUTION: DO NOT cut the sides, and DO NOT cut the 710ES
sender shorter than 4 ½”. The cut must be in between the sensor
pads, and the cut must be made parallel to the existing bottom
end. Double check your measurements, if the sender is cut too
short, it cannot be lengthened.
W CAUTION: Make sure that the end with wires is pointing up!!