Garnet SeeLeveL II 709-RVC 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
MANUAL
RVgauge.com | 1-800-617-7384
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 Manual
Table of Contents
CHAPTER 1 - OVERVIEW.............................................................................................3
CHAPTER 2 - SYSTEM DESCRIPTION .....................................................................4
CHAPTER 3 - OPERATING INSTRUCTIONS ..........................................................6
CHAPTER 4 - DISPLAY CALIBRATION.....................................................................9
CHAPTER 5 - SENDER PROGRAMMING ............................................................. 14
CHAPTER 6 - INSTALLATION GUIDE..................................................................... 18
CHAPTER 7 - TROUBLESHOOTING GUIDE......................................................... 26
CHAPTER 8 - SPECIFICATIONS ............................................................................... 34
CHAPTER 9 - SERVICE AND WARRANTY INFORMATION............................ 35
GARNET
SEELEVEL II TM
Tank Monitor
MODEL 709-RVC
709-RVC Manual_v4.12 - 17-Feb 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.

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709-RVC 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 will monitor the battery voltage, the fresh water
and sewer holding tanks and the LP gas tank. The 709-RVC is also
RV-C network compatible, the tank levels and alarms are available
on the RV-C bus for the fresh, grey, black and one LP tank. 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 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

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709-RVC 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.
The display can use an existing LPG electrical sender to show the
LPG level. It can be automatically calibrated to any sender, and
shows level on the LED display in percent of full, from 0% to 100%.
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, a high or low water level, or a high or
low LP 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.

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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 or LPG) 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 LPG tank level:
1. Press the LPG button and release it, the display will show the
LPG 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 is pressed before the 5 second time is up
for the LPG 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. There is no hold mode for the LPG. The LPG tank level cannot
change fast enough to justify the use of the hold function,
except during lling of the tank. The gauge should not be
used as a full tank shuto indicator since the LPG sender in
the tank is not reliable or accurate enough to be used as a
safe indicator of a full tank.
CHAPTER 3 - OPERATING INSTRUCTIONS

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709-RVC Manual
Note: If using two displays (i.e. a primary and a secondary display),
then only the primary display should have a connection to the
LPG tank. If both displays are connected to an LPG tank, then an
incorrect reading will result. The primary display relays LPG levels
to the secondary display through the sender wiring.
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.

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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 and 18 for galley
(depending how the display is equipped). The LPG sensor uses a
default source address of 73 and a SPN-ISB instance of 3.
1. By disabling the LPG or 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 in
the image above. 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 (+)

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709-RVC Manual
To calibrate the LPG sender:
1. The LPG tank must be full when the sender is calibrated,
otherwise the calibration will be invalid. Fill the LPG tank by
using an alternate measurement method, such as weight, a
spit valve, or a mechanical gauge on the tank.
2. To calibrate the tank, press and hold down the LPG button,
the display will show some LPG level.
3. While continuing to hold down the LPG button, press and
hold down the BATT button. Continue to hold down both
buttons for about 15 seconds until the display shows “LPG”.
4. When this occurs release both buttons, the display will show
“CAL” for a couple of seconds and then shuts o, completing
the calibration procedure. The LPG can be recalibrated as
many times as desired, although recalibration should not be
needed unless the LPG tank sender or the display has been
replaced.
Note: If the buttons are held down for an additional 5 seconds
after showing “LPG”, the display will show “ESC”, this escapes the
calibration process and prevents any changes from being made.
To enable/disable the LPG sender:
The LPG sender can only be disabled from the primary display.
If these steps are used on the secondary display, no change will
result.
1. Press and hold down the LPG button.
2. While continuing to hold down the LPG button, press and
hold down the BATT button. Continue to hold down both
buttons for about 10 seconds until the display shows “AbL”.
3. When this occurs release both buttons, the display will show
“En” for enabled or “diS” for disabled.
4. Press the LPG button to switch between enabled and disabled.
5. Press the BATT button to save and exit the menu.
CHAPTER 4 - DISPLAY CALIBRATION

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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.
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.

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709-RVC Manual
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/LPG):
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. The LPG tank does not show “dIA”.
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, LLo) or a high level above
the alarm point (FHi, GHi, bHi, LHi). 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”, “LAS”, depending on which tank is selected.
Release the button.
7. To set the alarm point, the GREY button increases the value,
the FRESH button decreases the value, the BLACK button
cycles through the trip polarity and the inclusion in the
common alarm output and the LPG button toggles the failure
polarity. 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.

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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.
Failure Polarity: While the LPG button is held down the display
shows “FtF” for fail to full, or “FtE” for fail to empty. After the
button is released, the left decimal on shows fail to full which
means that if the sender fails the alarm acts as though the tank is
full. The left decimal o shows fail to empty which means that if
the sender fails the alarm acts as though the tank is empty.
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.

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709-RVC 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 14 709-RVC 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.

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709-RVC 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 16 709-RVC Manual
710ES AND 710SS SENDER PROGRAMMING

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709-RVC Manual
710JS SENDER PROGRAMMING

Page 18 709-RVC Manual
Wire Colours on Connector
Wire Color Function
Red 18 gauge +12V
Black 18 gauge Ground
Blue 18 gauge Tank Senders
Green 18 gauge LPG tank
Orange 18 gauge Common Alarm Output
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 an 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
conguration to use and how long the senders should be.
Refer to the following table.
W CAUTION: DO NOT mix sender types when stacking senders.

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709-RVC Manual
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.
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
of both ES senders will be 21”. Make both senders 10.5” long.
WCAUTION: 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 4 1/2”. This sender will not work if it is cut
less than 4 1/2”. DO NOT cut the 710JS sender shorter than 4”. This
sender will not work if it is cut less than 4”.

Page 20 709-RVC Manual
710ES AND 710SS SENDER