yellow jacket 40870 User manual

YELLOW JACKET®
P51-870 TITAN® User Manual
P/N 40870, 40875, 40877
NOTE:These Instructions do not cover the manifold attached to the instrument.
For instructions on use of the TITAN® 4-Valve Manifold, please visit:
https://yellowjacket.com/product/titan-4-valve-test-and-charging-manifold/.
The Manifold Instructions are under the Documents tab.
REV D

Table of Contents
Ch. 1: Before You Start…………………….…………………………………………………………..……1
Contacting Ritchie Engineering..…………………….……………………………………………………………….1
Safety Information……………………………………………………….…………………………………………………1
Ch. 2: Getting Started…………………………………………………………..……………………………3
Getting to Know Your P51-870 TITAN®…………………………………………………….……………………..3
Turning the instrument On and Off………………………………………………………………………………….3
Interacting with the Device……………………………………………………………………………………………..4
Connecting and Using the Temperature Clamps………………………………………………………………4
Connecting and Using the Vacuum Sensor……………………………………………………………………….5
Interpreting the Battery Life Indicator………………………………………………………………………….….5
Charging the Battery………………………………………………………………………………………..…………….6
Operating the Backlight…………………………………………………………………………………………..……..6
Datalogging……………………………………………………………………………………………………………………6
Interpreting the RGB LED…………………………………………………………………………………………………8
Ch. 3: Modes of Operation…………………………………………………………………………………9
Modes Menu……………………………………………………………………………………………………….……..9
Pressure/Temperature Mode……………………………………………………………………………………..9
Overview…………………………………………………………………………………………………………….9
Interpreting the Pressure Analog Gauges…………………………………………………………..10
Interpreting the Pressure and Temperature Line Graphs……………………………….……10
Operating Pressure/Temperature Mode………………………………………………..………….11
Evacuation Mode……………………………………………………………………………………………………..12
Overview…………………………………………………………………………………………………………..12
Interpreting the Evacuation Gauge……………………………………………………………………12
Interpreting the Evacuation Graph…………………………………..………………………………..13
Operating the Evacuation Mode……………………………………….……………………………….13
Pressure Hold Mode – Pressure Decay Test………………………..………………………………………14
Overview…………………………………………………………………………………………………..………14
Interpreting the Pressure Decay Gauge………………………………………..………….………..15
Interpreting the Pressure Decay Graph……………………………………………………………..15
Operating the Pressure Decay Mode………………………………………………………………….16
Pressure Hold Mode – Pressure Rise Test………………………………………………..…………………17
Overview………………………………………………………………………………………………………..…17
Interpreting the Pressure Rise Gauge………………………………………….…………………....18
Interpreting the Pressure Rise Graph…………………………………………………………………18
Operating the Pressure Rise Test……………………………………………………………………….19

Ch. 4: Settings…………………………………………….……………………………………………………20
Settings Menus Overview…………………………………………………….…………………………………..20
General Settings Menu......……………………………………………………………………………………….20
Zeroing the Pressure Transducers………………………………………………………………………20
Calibrating the Touchscreen………………………………………………………………………………21
Refrigerant Settings Menu…………………………………………………………………………………….….21
Unit Settings Menu…………………………………………………………………………………………………..21
Pressure Units……………………………………………………………………………………………….….22
Temperature Units…………………………………………………….………………………………………22
Vacuum Units……………………………………………………………………………………………….…..22
Device Settings Menu……………………………………………………………………………………………….22
Brightness……………………………………………………………………………………………………..….22
Backlight Timer………………………………………………………………………..………………..……..22
Auto Off……………………………………………………………………………………….……………………23
Logging Rate…………………………………………………………………………………………..…..……23
Ch. 5: YJACK View App Integration……………………………………………………………..…24
Overview………………………………………………………………………………………………………………………24
Operation of the YJACK VIEW® App with the P51-870 TITAN®…………………………………..….24
Ch. 6: Maintenance………………….……………………………………………………………………..25
Overview……………………………………………………………………………………………………………………...25
General Maintenance……………………………………………………………………………………………………25
Replacement Parts…………………………..…………………………………………………………..…………..….25
Software Updates…………………………………………………………………..…………………………………….26
Ch. 7: Device Specifications………………………………………………………………………….….26
Ch. 8: Troubleshooting Guide….…………………………………………………….…………………27

1
Chapter 1:
Before You Start
Contacting Ritchie Engineering:
To order accessories, receive assistance, or locate the nearest YELLOW JACKET®distributor.
Corporate Office and Mailing Address:
Ritchie Engineering Co, Inc. YELLOW JACKET®Products Division
10950 Hampshire Avenue South, Bloomington, MN 55438-2623 U.S.A.
Phone: [phone] or [phone]
Fax: [phone]
E-mail: [e-mail] www.yellowjacket.com
Safety Information:
Use the instrument only as specified in this manual. Otherwise, the protection provided by the
instrument may be impaired. Refer to safety information in Table 1-1.
A Warning identifies conditions and actions that pose hazards to the user. A Caution identifies
conditions and actions that may damage the instrument or the equipment under test.
Table 1-1. Safety Information
Warning
To avoid personal injury or death, follow these
guidelines:
•Most governments and legal authorities
re- quire that HVAC technicians be trained
and certified in the safe and proper
operation of HVAC tools, such as this
instrument. Since this tool may be
connected to many types of equipment
through a limitless combination of hoses
and fittings, proper training is the most
important element of using this tool safely.
•Read the entire User Manual before using
the instrument.
•Use the instrument only as described in the
User Manual, otherwise the protection pro-
vided by the equipment may be impaired.
•Do not use the instrument if it is damaged.
Before you use the instrument, inspect the
case. Look for cracks or loose components
•The instrument contains no internal user-
serviceable parts; Do not open the
instrument. Have the instrument serviced
only by Ritchie Engineering Co. or
authorized service centers.
•Do not use the instrument if it operates ab-
normally. Protection may be impaired.
When
in doubt, have the instrument
serviced.

2
•Do not operate the instrument around
explosive gas, vapor, or dust.
•Various refrigerants have been intentionally
excluded for very significant safety reasons.
Never use refrigerants in this instrument
that are not listed in the Set-up menu.
•The refrigerant database in this unit may
include refrigerants classified as flammable.
If such refrigerants are selected, the
operator may need additional certifications
and/or training. Consult your government
and legal authority and comply fully with all
requirements.
•Always wear eye and skin protection when
working with refrigerants. Escaping
refrigerant vapors will present a freezing
danger. Do not direct refrigerant vapors
venting from hoses towards the skin.
•Maximum Working Pressure: 700 psia (4.83
MPa)
•Because this instrument allows for various
inputs including electrical and mechanical,
care must be taken to observe any ways
that an electrical shock hazard could
develop. Example: Wet or humid conditions,
along with a damaged thermocouple or
vacuum sensor, could allow an electrical
path across the instrument and over wet
hoses. Keep all interconnected equipment
clean, organized, and in proper condition.
Do not use the instrument if you are not
qualified to recognize potential electrical
faults.
To avoid damage to equipment, follow these
guidelines:
•Do not allow pressures beyond the
specifications listed in this manual.
•Be aware that internal pressures can change
unintentionally when equipment is stored
with pressure in the system during
temperature changes. If sub-cooled liquid
refrigerant is trapped in a hose or manifold
with no room for expansion, it may result in
dramatic pressure variations with seemingly
small temperature changes. Pressures can
reach high enough levels to cause damage
to the instrument’s internal pressure
transducers. Release liquid refrigerant from
the hoses and manifold when disconnecting
from a system.
•Do not attempt to introduce liquid or
samples heavily laden with oil into the
instrument.
•Do not use this instrument on systems
containing leak sealing chemicals. These
leak sealants can collect and harden in the
instrument, causing permanent damage.

3
Chapter 2:
Getting Started
Getting to Know Your P51-870 TITAN®:
1. Touchscreen Display
2. Power Button
3. RGB LED
4. Temperature Clamp Mounting Pegs
5. Silicone Plugs
6. T1 Connector
7. T2 Connector
8. A1 Connector
9. A2 Connector
10. Micro-USB Connector
11. Serial Number/Bluetooth® ID
Turning the instrument On and Off:
Press and release the power button, located at bottom
center of the display. The YJ logo will appear briefly on
startup. The current firmware version and Serial Number are
displayed at the bottom left and right corners of the display
respectively on power up. The instrument will then proceed
to the Modes Menu.
At any time during operation, press and hold the power
button for 3 seconds to turn off the instrument.
Figure 1: P51-870 Front View
1
2
3
4
7
8
5
9
6
Figure 3: Powering on the Device
Figure 2: P51-870 Rear View
11
10

4
Interacting with the device:
The P51-870 TITAN® features a 4.3” full color resistive
touchscreen for improved usability and durability. To
interact with the device, use a finger or stylus to touch
anywhere on the screen. All interactive buttons are
conveniently displayed with the same golden yellow
color as seen in Figures 4 & 5. The only exception to this
rule is the interaction with the gauge and graphs in
Pressure/Temperature mode.
Resistive touchscreens are resistant to impact and various
chemicals, compatible with all types of stylus, and are not
susceptible to grease and moisture. While more durable, a
resistive touchscreen requires a larger input force to
register a touch then other common touchscreen types.
Using a fine tipped stylus or fingernail can greatly improve
interaction with the device. For instructions on
touchscreen calibration, see page 21.
Connecting and Using the Temperature Clamps:
Two (67010) temperature clamps, pictured in Figure 6, are supplied
with the P51-870 TITAN® and can be used to monitor system
temperature, superheat and subcooling. To connect the sensors to the
device, remove the clear silicone plugs from the back of the device
covering connectors T1 and T2. Insert the male temperature clamp
connectors into either the T1 or T2 connectors (shown in Figure 7
below). Attach the clamps to the point on the system where it is
desired to measure temperature. Ensure that both jaws of the clamp
are well secured and the metal temperature probe on the upper jaw is
flush with the surface to be measured.
When not in use, the temperature clamps can be conveniently stored by attaching the clamps to
the two mounting pegs located on the back of the device.
Figure 4: Pressure/Temperature Mode Interaction
Figure 5: Device Settings Interaction
Figure 6: 67010 Included Temp
Probes
Figure 7: Connecting the Temp Probes

5
Connecting and Using the Vacuum Sensor:
The P51-870 TITAN® includes a (67044) YJ vacuum sensor, pictured in Figure 8, which can be used
with this unit to measure the current depth of vacuum within a system. To connect the vacuum
probe to the device, remove either of the two clear silicone plugs on the back of the device
covering the A1 and A2 connectors.
Insert the vacuum probe connector into either the A1 or A2 audio connectors as shown in Figure
9. The P51-870 TITAN® will prioritize the A1 connector but can measure through the A2
connector. Connect the vacuum probe to a system during evacuation to monitor the system
pump down. Ensure that the vacuum probe is tight to the system and at a significant distance
from the vacuum pump such that it does not disturb the vacuum measurements.
Interpreting the Battery Life Indicator:
This instrument utilizes a 2000mAhr rechargeable lithium ion battery. It is equipped with a
battery level indicator displayed in the top left corner of all screens (shown in Figure 10). At full
charge, the battery will appear solid green and will indicate 100% charge to the right of the
indicator. As the charge is drained, the green bar will decrease in width. When the battery life
indicator turns red, the device charge is at 10% or less and needs to be plugged into a power
source immediately.
Figure 10: Battery Life Indicator
This device is rated for 4 hours of battery life with full backlight brightness and 80 hours with no
backlight. To properly maximize battery life, make use of both auto off and auto dimming
Figure 8: 67044 Vacuum Sensor
Figure 9: Connecting the Vacuum Sensor

6
features accessible in the device settings menu (see Pages 22-23). The most influencing factor on
battery life is the backlight intensity, be sure to adjust the backlight level accordingly depending
on your current viewing conditions.
Charging the Battery:
To ensure maximum battery life, make sure the P51-870 TITAN® is charged
before and after each job session. To charge the device, remove the micro-
usb cover and connect the manifold to a power source via the provided data
transfer cable as pictured in Figure 11. When connected to a power source,
the LED will turn a solid green. It takes approximately 2.5 – 3hrs to reach full
charge from dead battery. Once the device has reached full charge, the
green LED will shut off indicating the charge is complete.
Operating the Backlight:
This instrument is equipped with an adjustable backlight and backlight auto dimming capabilities.
When the backlight dims during use, a touch anywhere on the screen or a quick press of the
power button can be used to wake up the device and power the backlight on.
To help conserve battery life, make sure to use the
backlight timer feature in device settings (Figure 12).
This feature allows the user to set intervals for how long
the backlight should remain on after the last user input.
The backlight timer can be adjusted from 5 seconds to
15 min. See page 22 for instructions on adjusting the
backlight level and timer.
Datalogging:
The P51-870 TITAN® digital manifold can be used to gather and record live system readings for
later analysis. From the moment the device is powered on, it begins to record all current data
inputs including Pressure, Temperature, and Vacuum. The logging rate can be adjusted anytime
through the device settings menu (see Page 22).
Figure 12: Backlight Settings
Figure 11: Charging the
Battery

7
After completing a job, the datalog files can be accessed by connecting the instrument to a PC.
To connect the P51-870 TITAN® to a PC, connect the provided data transfer cable to the micro-
USB port on the back of device shown in Figures 13 and 14. Plug the opposite end into the USB
port on a PC. Ensure that the device is powered on, the PC will attempt to open the device as a
flash drive.
Datalog files are stored as .csv files and are named with the following date/time convention: last
number of year, work week, last three digits of serial number, letter convention preventing
duplicates. See Figure 15 for example of stored datalog files.
Ex. 50th week of 2017 with device serial number ending in 127, 4th datalog file; 750127AD
These files cannot be modified while stored on the device but can be copied from the drive to
the PC and modified using any application compatible with .csv files (Microsoft Excel, notepad,
etc.).
When the device is nearing full storage capacity, the device will prompt the user on startup with
remaining datalog time at current sampling rate. Selecting “Yes” will clear all datalog files stored
on the device. If selecting “NO”, the device will proceed to normal startup and retain all stored
Figure 15: P51-870 as Removeable Drive
Figure 13: Micro-USB
Location
Figure 14: Connecting to
the Micro-USB

8
datalog files. If the device reaches max storage and has not
been cleared, it will cease to log data until all files have been
cleared from the device. Be sure to select the proper logging
rate based on the intended length of the datalog session. As
the P51-870 has limited internal memory, exceeding
maximum memory capacity will result in loss of data and
may cause corruption of the current datalog session file. To
avoid this, ensure to select the appropriate logging rate for
your current datalog session. Table 2-1, details the
maximum logging duration for several logging rates
assuming the internal memory has just been cleared, or is
0% capacity.
Interpreting the RGB LED:
The LED on the front face of the device can display a variety of colors during normal operation.
Below is a list of various colors and flashing schemes encountered during normal use.
•Flashing Blue: The P51-870 TITAN® flashes blue every time it stores a datalog sample. If
the logging rate is set to a larger time increment, the LED will not flash blue as often.
•Flashing Red: When the device reaches low charge, or falls below 10% battery charge, the
LED will flash red every time a datalog sample is taken (at the same rate as flashing blue).
•Flashing Violet: The instrument will flash a violet color every 1 second when connected
and transmitting data via Bluetooth® to a device.
•Solid Red/Blue: The LED will turn a solid red or blue when the power button is pressed
and held (usually when powering on/off). Powering on the device will display a solid blue
LED, powering off will display a solid red LED.
•Solid Green: The LED will remain a solid green color when connected to a power source
and charging. When the device reaches full charge, the solid green light will shut off
regardless if it remains connected to a power source.
•Solid Violet: If the instrument is placed into updater mode, the LED will turn a solid violet
color and the display will shut off (if the device is powered on). This mode is not intended
for normal use; to exit updater mode, hold the power button for 3 seconds or until the
LED powers off.
Table 2-1: Sampling Rates and Time to
Maximum Memory Capacity

9
Chapter 3:
Modes of Operation
Modes Menu
The P51-870 TITAN® will always start up on the Modes Menu shown in Figure 16 below. Tap any
of the three buttons labeled “Pressure/Temperature, Evacuation, Pressure Hold” to start a
Pressure/Temperature, Evacuation, or Pressure Hold session respectively. The general settings
menu can be accessed by tapping the gear icon in the upper right-hand corner.
Pressure/Temperature Mode
Overview:
The P51-870 TITAN® Pressure/Temperature mode can be used to accurately diagnose and service
any system with compatible refrigerant. Pressure/Temperature mode features high and low side
digital analog gauges that can be converted to a graphical form for superior data evaluation. This
mode can be used to monitor system high and low side pressure, system temperature, vapor
saturation and liquid saturation temperatures, and calculated system superheat and subcool.
Figure 16: Modes Menu

10
1. Battery Level Indicator
2. Session Timer
3. Currently Selected Pressure & Temperature Units – Unit Settings Menu Shortcut
4. Currently Selected System Refrigerant – Refrigerant Settings Shortcut
5. Low Side Pressure & Temperature Measurement
6. High Side Pressure & Temperature Measurement
7. Current Mode Selection – Modes Menu Button
8. General Settings Button
Interpreting the Pressure Analog Gauges:
Pressure/Temperature mode features a set of fully functional digital analog pressure gauges.
Each gauge operates on a linear scale with minor divisions indicated by small dots and major
divisions by larger dots respectively. When adjusting the selected pressure unit, the gauge face
will update accordingly to reflect that unit of measure. High and low side pressure is displayed in
a digital format at the center of each blue and red analog gauge respectively. Each gauge needle
adjusts in real time and can be used to observe fluctuations in pressure as if utilizing a real analog
gauge. All temperature readings are conveniently displayed below each gauge as Tsat (saturation
Temperature), T1/T2 (system temperature), and SH/SC (superheat & subcool).
Interpreting the Pressure and Temperature Line Graphs:
Each digital analog gauge can be transformed into a line graph (shown in Figure 18) by tapping
anywhere within the center of the gauge. While in graph mode, both system pressure and
temperature are plotted on a linear scale and are denoted as P1/P2 and T1/T2. The pressure and
temperature graphs utilize an orange leader line to plot new data from left to right. Old data is
conveniently displayed to the right of the leader line such that it can be compared to newer data
3
1
2
4
5
6
7
8
Figure 17: Pressure/Temperature Mode Diagram

11
as it is recorded. Any old data will be replaced by newer data as the leader line advances to the
right, each graph completely overwrites every 100 seconds (approx. 1.5 minutes).
Each line graph centers on the first pressure or temperature measurement recorded when
beginning a new plot, this value is displayed adjacent to the plot line to the left of each graph.
Above this, a scaling value is displayed. The scaling value sets the upper and lower bound of each
graph based on the current central value.
Ex. First Reading = 150.2 psig
Scaling Value = 20 psi
Upper Boundary = 150.2 psig + 20 psi = 170.2 psig
Lower Boundary = 150.2 psig – 20 psi = 130.2 psig
While in line graph format, pressure, system temperature, saturation temperature and calculated
superheat and subcool are displayed in a table format below each set of graphs. Each graph can
be transformed back into a gauge at any time by tapping anywhere within the graph.
Operating Pressure/Temperature Mode:
While on any modes screen (or the modes menu), tap the settings icon in the upper right-hand
corner to access the general settings menu. Additionally, the unit settings and refrigerant settings
menus can be quickly accessed by tapping their respective buttons in the lower left and right-
hand corners respectively (or through the general settings menu). Finally, the modes menu can
be accessed by tapping the modes button at the top center of the display labeled with the current
mode of operation. The session timer displayed in the top right corner of the display begins to
increment the moment pressure/temperature mode is selected. Use the session timer to track
the length of a pressure/temperature session.
NOTE: Before connecting to the system, make sure to zero the pressure transducers at ambient
pressure to ensure accurate pressure readings. To read about the transducer zeroing process,
see page 20.
Central Value
Scaling Value
Figure 18: Pressure/Temperature Line Graphs

12
Evacuation Mode
Overview:
Once the refrigerant has been recovered from the system, the P51-870 TITAN® can be used to
accurately monitor the system evacuation. Evacuation mode displays the current vacuum
pressure in digital, analog, and graphical form, percent change per minute, estimated time
remaining, target vacuum level, and the vacuum hold timer.
1. Battery Level Indicator
2. Session Timer
3. Currently Selected Vacuum Unit – Unit Settings Menu Shortcut
4. Currently Selected Refrigerant – Refrigerant Settings Menu Shortcut
5. System Vacuum Pressure
6. Percent Change per Min.
7. Estimated Time Remaining
8. Target Vacuum Level Button
9. Vacuum Hold Timer Button
10. Modes Menu Button
11. General Settings Button
System vacuum pressure is displayed in real time as a digital representation as denoted by Pvac,
analog as represented by the green analog gauge, and a graphical format as a logarithmic line
graph. While evacuating the system, the P51-870 TITAN® will display 100000microns from
atmosphere down to the 100000micron vacuum level after which it will accurately measure and
display down to 5 microns.
Interpreting the Evacuation Gauge:
Evacuation mode features a fully functional digital analog vacuum gauge on the right side of the
display. The evacuation gauge operates on a logarithmic scale from atmosphere (ATM) to 0
microns. A digital reading and currently selected vacuum units are displayed at the center of the
gauge. The needle of the evacuation adjusts in real time and can be used to visualize fluctuations
1
2
3
4
5
6
7
Figure 19: Evacuation Mode Diagram
8
9
10
11

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in vacuum pressure during a system evacuation. Because the evacuation operates on a
logarithmic scale, the resolution of the needle movement increases in a deeper vacuum meaning
small fluctuations in vacuum pressure become more apparent in a deeper vacuum.
Interpreting the Evacuation Graph:
In addition to the evacuation gauge, evacuation mode also features a fully functional evacuation
line graph like those in Pressure/Temperature mode. Unlike the pressure and temperature
graphs, the evacuation graph features a logarithmic y-axis. This means that the evacuation graph
captures the full scale of an evacuation but is more precise in a deep vacuum allowing the user
to observe small fluctuations in vacuum pressure. An orange leader line is used to plot new data
from left to right. This function allows the user to compare old data to newer data as each
measurement is recorded and displayed. The line graph fully overwrites the old data every 200
seconds (approx. 3.5 minutes) and will begin again from the left side of the graph.
Operating the Evacuation Mode:
Before beginning an evacuation, connect the YJ Vacuum Probe (67044) to either the A1 or A2
connectors on the back of the device. Connect the vacuum probe to the system at a sufficient
distance from the vacuum pump such that it will not disturb the vacuum reading. Use the
“Target” and “Hold” buttons to set the target vacuum level and vacuum hold timer respectively.
Pressing each of these buttons will cycle between a range of available values, with the last value
selected being automatically saved. Target vacuum level can be adjusted in 6 increments: 200,
300, 400, 500, 750, 1000microns (or equivalent selected vacuum unit). Vacuum hold timer can
be adjusted in 7 increments: 1m, 3m, 5m, 10m, 15m, 30m, None.
The session timer, displayed in the top right corner will begin incrementing the moment
evacuation mode is entered. Use the session timer to monitor the overall length of the
evacuation session. While evacuating a system the %/min will change to reflect the current %
change in vacuum pressure every minute. A larger number will indicate a faster evacuation rate
than a lower number. Additionally, the estimated time remaining is denoted by ETR and will
adjust based on the current %/min and the target vacuum level setting.
Once the set target vacuum level has been reached, the vacuum hold timer will start to deplete.
When the hold timer reaches zero, an alarm will sound indicating the evacuation has been
completed. In addition, the user will be prompted to start a pressure hold test as shown in Figure
20. By tapping the button “Begin Pressure Hold Test?” the user will be taken to the pressure rise
setup screen and the alarm will be silenced. If the button is not selected, the user will remain on
the evacuation screen. To silence the alarm, adjust the desired target vacuum level and continue

14
the evacuation or select a new mode of operation. If the vacuum hold timer is not desired, simply
tap the Hold button until NONE is displayed.
NOTE: Using the vacuum hold timer can help to ensure that all refrigerant has been evacuated
from the system and the system is free of non-condensables. Refrigerant and non-condensables
can cause the vacuum level to rise in a system giving a false positive during a leak test when no
leak is present.
Pressure Hold Mode – Pressure Decay Test
Overview:
The P51-870 TITAN® can be used to monitor a system leak through a drop in positive pressure.
The pressure decay test displays the current system pressure (Pc), the initial pressure (Pi), the
change in pressure (Pi-Pc), the Limit Pressure (Limit), and the Rate of Change (%/min).
Figure 20: Evacuation - Pressure Hold Test Prompt

15
1. Battery Indicator
2. Currently Selected Units – Unit Settings Menu Shortcut
3. Hold Timer
4. Currently Selected Refrigerant – Refrigerant Settings Menu Shortcut
5. Initial Pressure (Pi)
6. Change in Pressure (Pi-Pc)
7. Pressure Limit (Limit)
8. Rate of Change (%/min)
9. Current System Pressure (Pc)
10. General Settings Button
11. Currently Selected Mode – Modes Button
Live system pressure is measured and compared to initial pressure readings to determine if the
system has lost pressure over time. Current system pressure is displayed as a digital analog gauge,
a line graph, and in a digital format displayed at the center of the analog gauge.
Interpreting the Pressure Decay Gauge:
Pressure Decay mode features a digital analog pressure gauge on the left of the display. This
gauge operates on a linear scale with minor divisions displayed as small dots and major divisions
displayed as larger dots respectively. The current system pressure is displayed in a digital format
at the center of the analog gauge. Both the current pressure measurement and gauge face will
update to reflect the currently selected pressure unit. The needle of the pressure decay gauge
adjusts in real time and can be used to visualize any fluctuations in system pressure as if using a
real analog gauge.
Interpreting the Pressure Decay Graph:
Pressure Decay mode also features a line graph which plots current system pressure readings in
real time. System pressure is plotted on a linear scale and is denoted as Pc. The current system
pressure graph utilizes an orange leader to line to plot new data from left to right. Old data is
conveniently displayed to the right of the leader line such that it can be compared to newer data.
Figure 21: Pressure Hold – Pressure Decay
Test Diagram
1
2
3
4
5
6
7
10
11
9
8

16
Any old data will be replaced by newer data as the leader line advances to the right, the line
graph will completely overwrite every 200 seconds (approx. 3.5 minutes).
The line graph centers on the first pressure measurement recorded when beginning a new plot,
this value is displayed adjacent to the plot line to the left of the graph. Above this, a scaling value
is displayed. The scaling value sets the upper and lower bound of the graph based on the current
central value.
Ex. First Reading = 163.3 psig
Scaling Value = 20 psi
Upper Boundary = 163.3 psig + 20 psi = 183.3 psig
Lower Boundary = 163.3 psig – 20 psi = 143.3 psig
Operating the Pressure Decay Mode:
To conduct a pressure decay test, select “Pressure
Hold” from the modes menu, the device will advance
to the pressure hold test setup menu seen in Figure
22. This menu allows the user to adjust the allowable
change in pressure and pressure decay test duration.
Allowable change is measured as a percent of the
initial system pressure the system can drop before
the P51-870 TITAN® deems the pressure decay test a
failure. To adjust the allowable change percent, drag the slider bar until the desired percent
change is displayed. The test duration sets the length of time the pressure decay test will be
conducted. If the pressure has not dropped below the limit pressure within the test duration, the
P51-870 TITAN® deems the pressure decay test a pass. Tap the + and – buttons to adjust the test
duration value. When all desired settings have been set, select the continue button to advance
to the pressure decay test. The Back button can be used to return to the modes menu.
Ensure the system is properly charged to the desired test pressure and is connected to the
manifold low side transducer. Once the system is ready for the pressure decay test, tap the Set
Pi button to begin the test (shown in Figure 23). The current system pressure will be stored as Pi
and is displayed within the table directly below the pressure decay graph.
Figure 22: Pressure Decay Test Setup Menu
Figure 23: Pressure Decay Test – Set Pi

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During the pressure decay test, Pc will adjust as the current system pressure changes. Pi-Pc will
adjust to reflect the change between the initial system pressure and current system pressure.
Limit will display the limit pressure as determined by the percent allowable change. System
pressure dropping below this value within the time limit as set by the test duration will trigger a
failure. The rate of change as denoted by %/min displays the percent change in system pressure
per minute. A large leak will be indicated by a larger %/min value, conversely a smaller %/min
indicates a small system leak.
If the system pressure falls below the limit pressure within the test time limits, the P51-870
TITAN® will display a “FAIL” notice (Figure 24) and the buzzer will sound indicating the test is
complete. To silence the buzzer, exit the pressure decay test by selecting the modes button. If
the pressure decay test ends before the system pressure falls below the limit pressure, the device
will display a “PASS” notice and the buzzer will sound indicating the test is complete (Figure 25).
Pressure Hold Mode - Pressure Rise Test
Overview:
Pressure hold mode can also be used to monitor the system for a rise in vacuum pressure. A
pressure rise test can be helpful to determine if the system has a leak or there are non-
condensables and refrigerant remaining within the system. The pressure rise test displays the
current system vacuum pressure (Pvac), the percent change per minute (%/min), the initial
pressure (Pi), the Limit pressure and test duration.
Figure 24: Pressure Decay Test - FAIL
Figure 25: Pressure Decay Test - PASS