Precision Circuits One Place User manual

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
Part #00-10032-100
Start
Stop
Meter
Heater
Electric Heater
L. P. Tank
Pump Battery
GenSet
Water Levels
Wa t e r P um p O N
W a t e r H ea t El ec O F F
W a t e r H ea t L. P. FAIL
3. Touch to turn L.P. Water Heater On and Off. Display will be , ,
or , if the L.P. Heater fails to light.
ON OFF
FAIL
2. Touch to turn Electric Water Heater On and Off. Display will be , or . ON OFF
1. Touch to turn Water Pump On and Off. Display will be , or .
Works with separate Water Pump Control, and switches in multiple locations.
Displays status of Water Pump, no matter where switch is pressed.
ON OFF
4. Generator Switches. See #4 below for detailed operation.
5. Battery Level Switch. See #5 below.
6. Tank Level; Fresh, Gray, Black & L.P. See #6 below.
To conserve Battery power, after 1 minute Backlighting will go off, and display will return to this Default Screen. However, the Panel is still live.

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
Trouble Shooting Water Pump
 If Pump Indicator will not Show when Pump Is On, place Voltmeter between pins 4 and 5 of the connector.
Voltage should be 2.5 when Pump is off, and 8 volts when Pump is running. If not test Water Pump Control.
 If Pressing Water Pump Switch on Panel does not turn on Water Pump, place Voltmeter between pins 4 and 5 of
the connector. Voltage should momentarily go near Zero when the Pump Switch is pressed
Trouble Shooting Water Heater Switches
 Place Voltmeter between pins 3 and 5 of the connector. When Water Heat Elec is On, Voltage should be +12V.
When Water Heat Elec is Off, Voltage should be 0. Momentarily press Water Heat Electric Button to toggle
between On and Off.
 Place Voltmeter between pins 1 and 5 of the connector. When Water Heat LP is On, Voltage should be +12V.
When Water Heat LP is Off, Voltage should be 0. Momentarily press Water Heat LP Button to toggle between On
and Off. While Water Heat LP is On, a +12V signal on pin 7, Pilot Out Indicator, will cause the Display to read
“FAIL”.
Trouble Shooting
 If Monitor Panel is completely non-operational, Check to make sure
there is between +11Volts and +15Volts between pins 2 and 5.
Trouble Shooting Battery Voltmeters
 Place Voltmeter between pins 2 and 5 of the connector. Voltage should be close to House Bat Voltage.
 Place Voltmeter between pins 8 and 5 of the connector. Voltage should be close to Chassis Bat Voltage.
View of connector is fromWire Harness contact insertionside
WATER PU MP S WITCH
SYS TEM GR OUN D
WAT ER HEATER LP
COA CH BAT POWER
WATER HE ATER ELEC
SYS TEM GR OUN D
PILOT OUT INDIC ATOR
CHASSIS BAT SE NSE
4 3 2 1 8 5
J2

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
5. Touching Battery Levels button brings you to this screen. The
Chassis and House Battery Voltages will display in both Digital and
Analog (bar graph) format. The Analog range is 10.0V-15.0V; with
bar graph meter increments of 0.125Volts.
The screen will continually update every 1 second.
Chassi s Bat Voltage
13. V ———
House Bat Voltage
1 . 6V —— ——
"""""
""""
Fr e sh W a te r T an k / 3
L . P. G a s T an k E
Gra y W a st e T an k 1/3
Bl a ck W a st e T an k F
Fr e sh W a te r T an k / 3
L . P. G a s T an k E
Gra y1 W as t e Tn k 1/3
Gra y W as t e Tn k 1/3
Bl a ck 1 W as t e Tn k F
B l a ck W as t e Tn k F
6. Pressing Tank Levels switch brings you to this screen.
The screen will continually update every 1 second.
After 1 minute Backlighting will go off, and display will return to the
Default Screen (Water Pump.) Should a sensor exceed normal limits,
ERR will display in place of the level. Depending on your RV, the
Levels will be displayed in either 1/3's or 1/4's. E, 1/3, 2/3, F, or ERR;
or E, 1/4, 1/2, 3/4, F, or ERR.
If your RV is equipped with extra Waste Tanks, then the display is
split onto two screens as shown below, and touching the Tank
Levels button toggles between the two screens.

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
Trouble Shooting Water Level Sensors
There is potentially up to 5 Tanks on the RV. Each one has a pair of wires going to the J3
connector.
When the Tank Level Button is pressed, and the Display is showing the levels of the
Tanks, each one of the 5 pairs of wires should measure +5V. For example for the Fresh
Water Tank there should be +5V from pin 6 Ground to pin 12 Signal.
Shorting the two pins together will display ERR on the screen. Shorting the two wires at
the tank will test those wires.
Each Sensor on the Tank will send a signal to the Monitor Panel when it senses water. In
the picture to the right, the bottom sensor pad should be sending a signal. Placing a
piece of sheet metal next to either of the top two sensors should change the display from
1/3 to 2/3. In this way each individual sensor pad can be tested.
Trouble Shooting LP Tank.
Unplugging the connector from the board (or an open connection to the LP Tank Sensor)
will produce an ERR display.
With the connector removed from the Panel, place an ohm meter between pins 1 and 7 of
the connector. The LP sensor should measure approximately 0 ohms when empty and 90
ohms when full.
With the connector plugged in, place a Voltmeter between pins 1 and 7 of the connector.
The voltage reading should be 0 volts when empty and 2.25 volts when full.
GRAY TANK 2 GROUND
BLACK TANK 1
LP SEN SOR
FR ESH TA NK GR OU ND
BLACK TANK 1 GROUND
LP SE NS OR GROUND
BLACK TANK 2 GR OU ND
GRAY TANK 1 GROUND
BLACK TANK 2
GRAY TANK 1
GRAY TANK 2
FRESH TANK
56 4 3 2 1
1112 8 7
J3
Tank
Sensor
Module
To Monitor

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
4. GenSet Display and Function:
Meter Button - Touching the Meter Button simply displays the status of the Generator above, without performing any
functions. The display will show the status of the Generator, and Hour Meter.
Start Button - (Note: Generator status must be Stopped.)
a) Pressing and holding the Start button will operate the Generator Starter; Display = Starting.
b) Touching the Start button will activate the Auto-Start function, and the Panel will attempt to start
the Generator automatically; Display = Auto-Start.
(If the Auto-Start functions fails to start the Generator; Display = Will Not Start.)
Stop Button-
a) Pressing and holding Stop button will operate the Generator Stop Relay; Display = Stopping.
If the Generator is Running this will Stop the Generator.
If the Generator is Stopped this will prime the fuel system.
b) Touching the Stop button will activate the Auto-Stop function, and the Panel will attempt to stop
the Generator automatically; Display = Auto-Stop .
(If the Auto-Stop function fails to Stop the Generator; Display = Will Not Stop.)
(See Generator Manual for Operation or Troubleshooting Guide)
G e ne ra t or
S to pp e d
1 5 45 . 3 Ho ur s
Generator
R un ni n g
1 5 45 . 3 Ho ur s

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
Trouble Shooting Generator Function
Voltage between Pins 4 and 1 should be +12V when the Generator is running, and
change the display from “Stopped” to “Running”.
While Pressing and Holding the Generator Stop Button, pin 2 Stop voltage should go to
zero, and return to +12V when the Button is released.
Make Sure Generator is not already running.
While Pressing and Holding the Generator Start Button, pin 3 Start voltage should go to
zero, and return to +12V when the Button is released.
Note: Semi-automatic functions will operate as long as the above three tests perform
properly.
INDI CATOR
STAR T
STOP
GROUND
2 1
J1

03/06/2012 Confidential and Proprietary Information
Precision Circuits Inc
One Place Monitor Panel
 The One Place Monitor Panel has three automatic learn features :
 1. If the Water and Waste Tanks have 1/3 or 1/4 increment sensors.
 2. If a second Gray and/or second Blank Waste Tank exists.
 3. If Water Heater Function exists.
 Each feature above is learned independently, even for the individual Tanks.
 Once a feature is learned, it is stored in non-volatile memory, and remembered even if Battery Power is removed
from the Panel.
 The One Place Monitor Panel has many safe guards to prevent improperly learning a feature. Should the Panel
have learned something incorrectly, an option exists on the Panel to reset the original factory default, so that the
Panel can re-learn the proper features.
To Reset the Panel to Default
1. Press and hold all three buttons shown above for
approximately 6 seconds, until the above screen appears.
2. Press the Default Button (Water Pump)
3. Press the Exit Button (Battery Level).
4. The Panel will return to the Water Pump Display.
Example Messages
when Selecting desired
Function to control.
Water
Pump
Fa ct o ry M o de
D f lt T es t E xi t
Tank
Level Battery Level