Carrier ComfortPro PC6000 Installation and operating instructions

R
62--11175 Rev --
Operation & Service Manual
for
ComfortPro™Auxiliary
Power Unit
Auxiliary Power Unit
Models PC6000, PC6002, PC6003 & PC6006

62-11175 COMFORTPRO SERVICE MANUAL c-i
CONTENTS
INTRODUCTION
SAFETY
Safety Alerts ................................................................................. c-iii
Component Layout.......................................................................... c-v
GENERAL ARRANGEMENT
APU Dimensions ............................................................................ c-vi
CCU Dimensions........................................................................... c-vii
Condenser Dimensions ................................................................. c-vii
1.0 OPERATION OF MULTI–FUNCTION D.C.P
1.1 PREPARATION
1.1.1 Multi–Function D.C.P Components....................................... 1-1
1.1.2 How the ComfortPro Operates ............................................. 1-2
1.2 MANUAL OPERATIONS
1.2.1 Starting the APU ................................................................ 1-3
1.2.2 Stopping the APU ............................................................... 1-3
1.2.3 Turning the Heater ON/OFF................................................. 1-4
1.2.4 Heating: Setting the Temperature........................................ 1-4
1.2.5 Turning the A/C ON/OFF..................................................... 1-4
1.2.6 Setting the A/C Temperature .............................................. 1-4
1.2.7 Fan Operation .................................................................... 1-5
1.3 AUTOMATIC OPERATIONS
1.3.1 Password Protection........................................................... 1-5
1.3.2 Entering Password ............................................................. 1-6
1.3.3 Setting the Clock ............................................................... 1-7
1.3.4 Comfort Monitor................................................................. 1-7
1.3.5 Timer ................................................................................ 1-8
1.3.6 Cold Weather Watch......................................................... 1-10
1.3.7 Maximum Run Time.......................................................... 1-11
1.3.8 Battery Monitoring............................................................ 1-12
2.0 CLIMATE CONTROL UNIT (CCU)
2.1 PREPARATION
2.1.1 Charging the CCU............................................................... 2-1
2.2 SERVICE
2.1.2 Maintenance Schedule ....................................................... 2-2
2.1.2 CCU Spring Tune–Up .......................................................... 2-3
3.0 TROUBLESHOOTING
3.0 MANUAL OPERATIONS
3.1 APU (Auxiliary Power Unit)............................................................... 3-2
3.2 GENERATOR .................................................................................. 3-6
3.3 DRIVER CONTROL PANEL ............................................................... 3-7
3.4 CCU AIR CONDITIONING ................................................................. 3-8
3.5 CCU Fan ..................................................................................... 3-11
3.6 CCU Heat.................................................................................... 3-11
3.7 RECEPTACLE PANEL..................................................................... 3-12

62-11175 COMFORTPRO SERVICE MANUAL
c-ii
3.0 TROUBLESHOOTING (Cont.)
3.8 TESTING PROCEDURES
3.8.1 Testing AMP draw for components ....................................... 3-13
3.8.2 Testing Voltage and Hz readings .......................................... 3-13
3.9 ADDITIONAL INFORMATION
3.9.1 Adjusting the 120 A/C Voltage............................................. 3-14
3.9.2 Capacitor Troubleshooting ................................................... 3-14
3.9.3 Capacitor Theory................................................................. 3-14
3.9.4 Potential Relay Theory......................................................... 3-15
3.9.5 Alternator Troubleshooting................................................... 3-15
APPENDICES
CAPACITIES AND SPECIFICATIONS ........................................................... A-2
FUSE LOCATIONS ................................................................................... A-4
CIRCUIT BREAKER LOCATIONS ................................................................ A-5
APU CONTROL UNIT................................................................................ A-6
CCU CONTROLLER.................................................................................. A-7
FUEL SYSTEM PURGE PROCEDURE ......................................................... A-8
COOLANT PURGE PROCEDURE ................................................................ A-9
DEFROST/HEAT & DCP SENSOR............................................................ A-11
ENGINE INTERLOCK.............................................................................. A-12
APU WIRING (Serial# KZX98002290 to Date) ......................................... A-13

62-11175 COMFORTPRO SERVICE MANUAL c-iii
SAFETY
DANGER
Immediate hazards that will result
in severe personal injury or death.
WARNING
Hazards or unsafe practices that
could result in severe personal
injury or death.
CAUTION
Hazards or unsafe practices that
could result in minor injury or
product or property damage.
NOTICE
Information that is important to
proper installation or maintenance,
but is not hazard-related.
DANGER
A certified refrigeration technician
must charge and test the CCU.
For example:
Safety Alerts
Throughout this manual, you will see notes labeled "Warnings" or "Cautions"
to alert you to special instructions or precautions concerning a particular
procedure that would be hazardous if performed incorrectly or carelessly.
Observe them carefully!
These safety alerts alone cannot eliminate hazards that can occur. Strict
compliance with these special instructions when performing the installation and
maintenance, plus common sense, are major accident prevention measures.

62-11175 COMFORTPRO SERVICE MANUAL
c-iv
Safety Considerations
Inhalation of exhaust gas (containing carbon monoxide) may cause severe
personal injury and/or death. Anyone suspected of suffering from CO
inhalation should be removed from the hazardous area and given medical
assistance immediately.
Exercise extreme caution when working near fuel or fuel-filled equipment.
Do not operate equipment during fueling operations. Use eye protection
when working near batteries, which contain acid and can explode. Do not
smoke or use open flames near batteries.
Electric shock can cause severe personal injury, burns, and death. Before
working on any unit, disconnect the batteries. Use only approved materials
and methods when working on the electrical system, and follow local
electrical codes. Never work on the APU or the electrical circuitry when the
APU is running. Never work with electricity in wet conditions or when you
are tired.
Fuel, oil, coolant, and refrigerant are toxic and in some cases, carcinogenic.
Wear eye and hand protection at all times. Remove contaminated clothing
immediately and wash contaminated skin. Do not breathe in vapors.
Moving parts can cause severe injury and/or death. Before working on any
unit, shut it off and disconnect the battery. Do not start until protective
covers have been replaced. Also, loose parts falling into rotating machinery
can cause severe accidents. Always ensure bolts and clamps are correctly
torqued and secured. Inspect mechanical components periodically for
damage, corrosion, and proper torque.
The APU is designed to provide electrical power for heating and cooling
vehicles in normal on-road conditions. Never use the APU to power critical
medical equipment or sensitive electronic equipment without the
manufacturer's express written approval.
Exhaust
Fuel/Batteries
Electrical
Intoxicants
Hot or Moving Parts
Misuse
WARNING
California Proposition 65 Warning: This product contains lead, a
chemical known to the State of California to cause cancer and birth
defects and other reproductive harm.

62-11175 COMFORTPRO SERVICE MANUAL c-v
COMPONENT LAYOUT
Figure C1: Main Components of the Carrier ComfortPro system and Where They Should Best be Installed on the Truck
DRIVER CONTROL
PANEL (DCP)
CLIMATE CONTROL
UNIT (CCU)
VEHICLE FUEL TANK
CONDENSER
AUXILIARY POWER UNIT (APU)
BATTERY
120 VAC
RECEPTACLE PANEL
FUEL SUPPLY
AND RETURN
COOLANT SUPPLY AND RETURN

62-11175 COMFORTPRO SERVICE MANUAL
c-vi
GENERAL ARRANGEMENT
18.5
16.0 24.9
2.6
28.5
2.75 3.875
10.5
3.0
TOP VIEW
REAR LEFT SIDE
APU Dimensions (Measurements in inches)
FRONT VIEW RIGHT SIDE

62-11175 COMFORTPRO SERVICE MANUAL c-vii
16.2"
15.2"
3.3" 3.1"
3.0"
1.3"
3.4"
3.0"
6.9"
3.0"
3.0"
6.9"
12.6" 12.9"
.125"
24.4"
23.4"
7.9"
12"
FRONT VIEW
BOTTOM VIEW
CCU Dimensions (Measurements in inches)
26.5"
24.25"
8"
3.5"
2.0"
5.62"
5.62"
13.93" 16.25"
16.90"
FRONT RIGHT SIDE
DOWN
Condenser Dimensions (Measurements in inches)

62-11175 COMFORTPRO SERVICE MANUAL
c-viii

62-11175 COMFORTPRO SERVICE MANUAL 1-1
1.0 OPERATION OF MULTI-FUNCTION
DRIVER CONTROL PANEL
Figure 1-0: Multi-Function Driver Control Panel
APU
ON/OFF
HVAC
OFF
ESC/
RESET
MENU
A/C FAN HEAT
HOURS
00000
APU
SP
1
2
3
4 5 6 7 8 9 10 11
T 2 T 1
1.1.1 Multi-Function Driver Control Panel Components
1When visible, the heating system is heating.
2When visible, the A/C is cooling.
3Indicates the number of operating hours on the APU.
4Indicates the state of the APU.
The APU engine is running.
The APU engine is off.
The APU engine is in the starting process (flashing).
5Indicates that Battery Monitor mode is enabled.
6Indicates that maximum run time is enabled.
7Indicates that Cold Weather Watch mode is enabled.
8Indicates that Comfort Monitor mode is enabled.
9Indicates that Timer 1 or Timer 2 mode is enabled.
10 Indicates that the ComfortPro is connected to shore power.
The APU cannot be started in Shore Power mode.
11 Indicates the state of the 115V outlet and CCU auto-reset breakers.
115 VAC power is being supplied to the outlet.
No power is being supplied to the outlet.
CCU breaker has tripped.
High Heat/Outlet breaker has tripped.
The breaker that tripped has reset automatically and the DCP needs
to be reset.
RE-
SET
TRIP
TRIP
OFF
T2T1
APU
APU
APU
NOTICE
The DCP (driver control panel), which
is mounted inside the truck bunk,
controls the APU and the CCU. The
central panel on the DCP provides
status information using words
and icons:
PREPARATION1.1

62-11175 COMFORTPRO SERVICE MANUAL
1-2
1.1.2 How the ComfortPro Operates
The ComfortPro has two modes of operation: manual and automatic.
Manual Mode
You start the APU from within the truck bunk using the On/Off button on
the driver control panel (DCP). Once the APU is running, you can start and
stop the fan, heater and air conditioning using the DCP. See page 1-3.
Once the heater or A/C is running, it will cycle (automatically turn on and
off) in order to keep the truck bunk at the temperature you specify. The
HVAC will continue to cycle until you turn it off. While the HVAC is cycling,
the APU remains on and will only turn off when you manually turn it off
using the button on the DCP.
Note that in manual mode, the APU remains on until you turn it off. But in
Comfort Monitor mode (described below), the APU automatically turns off
and on as required.
When the APU is running, power is supplied to the power outlet in the
truck bunk (except in high heat).
In manual mode, the APU will turn off automatically if the Maximum Run
Time is reached.
Automatic Mode
The ComfortPro has several functions that will start it in automatic mode.
Comfort Monitor
(page 1-7)
FEATURE DESCRIPTION
The APU and HVAC automatically turn on to
maintain a comfortable temperature in the truck
bunk. When the desired temperature is met, the
APU and HVAC automatically turn off. When the
temperature is again out of range, they will both
turn on again, and cycle heat and air conditioning
as needed.
Timer
(page 1-8)
At the specified time, the APU and HVAC
automatically turn on. During the specified
timer duration, the HVAC cycles on and off to
maintain the desired temperature. When the
timer duration expires, both the APU and HVAC
turn off automatically and remain off.
Cold Weather Watch
(page 1-10)
The APU and heater on the HVAC automatically
turn on in order to prevent the APU engine and
truck engine from getting too cold. (Turning on
the heater creates a “load” that makes the APU
work harder and therefore warm up faster).
Both the APU and HVAC turn off automatically
once the preset duration time expires.
The APU automatically turns on for 90 minutes
in order to recharge the batteries. The HVAC
does not turn on. After the 90 minute run time,
the system will sense voltage for 10 minutes,
before restarting if needed.
Battery Monitor
(page 1-12)
There are icons on the DCP that flash when the APU and HVAC are running.
See page 1-1. If you enter the truck bunk and APU or HVAC is on but you
did not start it, you can assume it has started in one of the automatic
modes, as described above. On the DCP, one icon will be flashing steadily:
this is the icon for the mode that is currently operating.
Whenever the ComfortPro is running in automatic mode, if you then press
the heat, A/C or fan buttons on the DCP, the ComfortPro will switch to
manual mode. The APU will not automatically turn off! This icon on the
DCP will also stop flashing.

62-11175 COMFORTPRO SERVICE MANUAL 1-3
Automatic Mode and Minimum Time Off
All these automatic functions work on a "minimum time off": the ComfortPro
must be off for at least 10 minutes before the automatic function will turn
it on again. For example, the Timer function may be set to turn on the
ComfortPro at 10:00 a.m. You have been running the ComfortPro in manual
mode. You turn off the ComfortPro at 9:55 a.m. The timer will only turn on
the ComfortPro again 10 minutes later, at 10:05 a.m.
Clock
In order to use the Timer correctly, you must set the DCP clock. See page 1-7.
Maximum Run Time
You can set the maximum time that the APU is allowed to continuously run
in manual mode. See page 1-11.
Password Protection
You can add a password to the DCP, then you can protect one or more
functions so that only a person who knows the password can set the
function. See page 1-5.
HOURS
00000
APU
PLEASE WAIT
APU STARTING
OFF
OFF
WARNING
Do not start the APU when the enclosure
cover is removed. Operating with the
cover off may result in injury and/or death.
Press and release once.
The display shows "PLEASE WAIT – APU
STARTING" and flashes.
When stops flashing, then the APU
has started successfully.
The APU startup sequence consists of
20 seconds of glowing (30 seconds when
the ambient temperature is below -5°C or
23°F) and up to 10 seconds of cranking.
If the sequence fails, "RESTARTING"
appears for six seconds. Then the
startup sequence automatically repeats
up to five times or until the APU starts.
If "CRANK LIMIT" appears, see
Troubleshooting section.
APU
APU
HOURS
00000
APU
RESTARTING
OFF
OFF
HOURS
00000
APU
CRANK LIMIT
OFF
OFF
WARNING
When the APU is about to start, a buzzer
sounds. Make sure no one is standing
near the APU or touching it.
1.2.1 Starting the APU "One Touch Start"
Press .
The APU will stop. The display
shows .
APU
HOURS
00000
APU
OFF
1.2.2 Stopping the APU
1.2 MANUAL OPERATIONS

62-11175 COMFORTPRO SERVICE MANUAL
1-4
1Press to activate the heater.
The display shows "HEAT LOW".
The heater will turn on only if the
temperature is too low (to adjust the
temperature, see below). When the
heater is on, appears.
2Press again to switch between
high and low heat to heat the truck
bunk more or less quickly. In "HEAT
HIGH" mode, the power outlet is
disabled and the display indicates .
The heat or A/C will turn off when the
desired temperature is reached.
3Press to deactivate heating.
OFF
HOURS
00000
APU
CH
HEAT HIGH
OFF
HOURS
00000
APU
CH
HEAT LOW
NOTICE
The heat mode will not function if the
temperature is higher than 85°F.
1.2.3 Turning the Heater ON/OFF
1.2.4 Heating: Setting the Temperature
1.2.5 Turning the A/C ON or OFF
1.2.6 A/C Setting the Temperature
Press or when the heater is on ("HEAT LOW"or "HEAT
HIGH" shows).
The notch on the temperature bar moves. The heater will automatically
turn on and off to maintain this temperature.
1Press to activate the A/C.
The display shows "A/C LOW".
The A/C will turn on only if the
temperature is too high (to adjust the
temperature, see below). When the
A/C is on, appears.
2Press again to switch between
high and low A/C to cool the truck
bunk more or less quickly.
3Press to deactivate the A/C.
CH
A/C LOW
HOURS
00000
APU
CH
HOURS
00000
APU
A/C HIGH
NOTICE
The air conditioning function will not
operate if the temperature is lower
than 65°F.
Press or when the A/C is on ("A/C LOW" or "A/C HIGH" shows).
The notch on the temperature bar moves. The A/C will automatically turn
on and off to maintain this temperature.

62-11175 COMFORTPRO SERVICE MANUAL 1-5
Press to toggle between low,
high and off.
The speed of the fan may automatically
change when the heat or A/C comes on,
then automatically change back when
the heat or A/C goes off.
You can still have the fan working even when the temperature is not low or
high enough for the heat or A/C to come on.
The fan operation is independent of the air conditioning and heat modes.
When the fan speed is manually set to high or low, the fan will return to
that setting when the desired temperature has been reached as the air
conditioning or heat cycles off.
HOURS
00000
APU
CH
FAN
LOW
CH
FAN
HIGH
HOURS
00000
APU
1.2.7 Fan Operation
1.3.1 Password Protection
1.3 AUTOMATIC OPERATIONS
You can add a password to the DCP, then you can protect one or more
functions so that only a person who knows the password can set the function.
On a newly installed DCP, the password is always 000, which means that
no password protection is in place.
To password-protect functions, first change the factory password; see
'Setting up for Password Protection'. All functions will now be password
protected. Then remove password protection from chosen functions, as
desired; see 'Protect Functions with a Password'.
If you know the password, you can change it at any time, if you need to.
Note that if you change the password to 000, you will remove password
protection from all functions.
If the password is ever lost, contact your dealer to have the password
reset to 000.
Setting up for PASSWORD PROTECTION
1Press .
2Press or until "SET/CHANGE PASSWORD" is displayed,
then press .
ENTER PASSWORD
OFF
000
OFF
HOURS
00000
APU
"ENTER PASSWORD" is displayed
with three blank squares, one for
each digit in the password. The
first digit flashes.

62-11175 COMFORTPRO SERVICE MANUAL
1-6
When you try to set up a function, you may be prompted to enter the password.
1Press or until the first number in the password
is displayed, then press .
2Repeat for each digit in the password.
3Press again after entering the last digit.
1.3.2 Entering the Password
3 Press or until the first number in the password is displayed .
For example, if your password is "432" press until "4" shows,
then press .
4Repeat for each digit in the password.
5Press again after entering the last digit. "NEW PASSWORD"
is displayed.
6Repeat the above steps to enter the new password. "CONFIRM"
is displayed.
7Enter the new password again, then press to exit this function.
PROTECT FUNCTIONS with a PASSWORD
1Press .
HOURS
00000
APU
OFF
PASSWORD
PROTECT
OFF
2Press or until
"PASSWORD PROTECT"
is displayed, then press .
If this menu item does not appear,
then you have not yet changed the
factory password from 000. Change
the password and then try again.
"ENTER PASSWORD" is displayed with three blank squares, one for
each digit in the password. The first square flashes.
3Press or until the first number in the password is
displayed, then press .
4Repeat for each digit in the password.
5Press again after entering the last digit.
The first feature that can be password protected is displayed with
"YES" or "NO" (indicating whether it is currently password protected).
6Press or to change the "YES" or "NO".
7Press to move to the next feature.
Or press or to skip to the next feature.

62-11175 COMFORTPRO SERVICE MANUAL 1-7
1.3.3 Setting the Clock
1Press .
2Press or until "CLOCK"
is displayed, then press .
If "ENTER PASSWORD" is displayed,
enter your password. If you do not
know the password, then you cannot
set up this function (see page 1-5).
The clock function takes you through
several settings: 12/24-hour-clock,
hour set, minutes set, am/pm-set (for
12-hour clock only), and day of the week.
You can set the clock on the DCP. This clock is used by the Timer function
(page 1-8). If you use the Timer function, remember that as you move from
one time zone to another, you must adjust the clock. Otherwise the Timer
will start the APU at the wrong time.
The clock settings remain even when the APU is turned off.
CLOCK
HOURS
00000
APU
CLOCK: SET MODE
OFF
12 HOUR
OFF
HOURS
00000
APU
3Press or to change the setting.
4Press to move to the next setting. Or press to cancel any
changes you have not yet accepted.
5When done, press to exit.
1.3.4 Comfort Monitor
You can specify the temperature you want in the truck bunk. Whenever the
truck bunk temperature goes 2° above or below this temperature, the APU
starts and the HVAC turns on until that temperature is reached or for
fifteen minutes, whichever is longer.
Turning COMFORT Monitor ON and OFF
1Press .
2Press or until
"COMFORT MONITOR" is displayed,
then press .
If "ENTER PASSWORD" is displayed,
enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "ON" or "OFF".
4Press to confirm this setting.
The current setting remains until you change it; turning off the APU or
manually starting the APU does not permanently cancel this setting.
COMFORT MONITOR:
ON
HOURS
00000
APU
NOTICE
The clock does not automatically
adjust for time zone changes; you
must adjust it.

62-11175 COMFORTPRO SERVICE MANUAL
1-8
You can set up the ComfortPro so that the APU and CCU run automatically for
a specified time on specified days of the week. There are two timers, so you
can set up two schedules.
For example, one schedule may be to run every day at 6:00 p.m. for .5 hours
and the other schedule may be to run every Monday at 6.00 a.m. for .5 hours.
You must set up the timer as follows: Specify the day and time you want
the APU to run, specify the duration (the length of time you want the APU to
run for) and specify the temperature you want maintained in the truck bunk
while the APU is running.
Turning TIMER On or Off
1Press .
2Press or until
"TIMER 1" or "TIMER 2" is displayed,
then press .
OFF
ON
OFF
HOURS
00000
APU
TIMER 1
T1
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "ON" or "OFF".
4Press to confirm this setting.
The current setting remains until you change it; turning off the APU or
manually starting the APU does not cancel the timer function.
1.3.5 Timer
Setting the TEMPERATURE
1Press .
COMFORT MONITOR
SET
HOURS
00000
APU
NOTICE
Factory Default Temperature Setting is
21°C / 70°F. Range is 18°C / 64°F to
30°C / 86°F.
2Press or until
"COMFORT MONITOR" is displayed,
then press .
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET".
4 Press to confirm this setting. The current temperature is displayed.
5Press or to scroll to the desired temperature.
6Press to confirm this setting. Or press to cancel and
retain the current temperature.
7Press to exit.

62-11175 COMFORTPRO SERVICE MANUAL 1-9
Setting the Start Time/Day
1Press .
2Press or until
"TIMER 1" or "TIMER 2" is displayed,
then press .
TIMER 1
OFF
SET START
OFF
HOURS
00000
APU T1
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET START".
4Press to confirm this setting. The current start time is displayed.
5Press or to set the hours, minutes and day.
6Press to confirm each setting.
Setting the DURATION
1Press .
2Press or until
"TIMER 1" or "TIMER 2" is displayed,
then press .
TIMER 1
OFF
SET DURATION
OFF
HOURS
00000
APU T1
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET DURATION".
4 Press to confirm this setting. The current duration time is displayed.
5Press or to scroll to the length of time to run the APU.
6Press to confirm this setting. Or press to cancel and
retain the current duration.
7Press to exit.
NOTICE
Factory Default Duration Setting is 1 hour.
Range is 0.5 hrs - 10 hrs (in 0.5 hr
increments).
Setting the TEMPERATURE for the Timer
1Press .
2Press or until
"TIMER 1 or TIMER 2" is displayed,
then press .
TIMER 1
OFF
SET TEMP
OFF
HOURS
00000
APU T1
NOTICE
Factory Default Temperature Setting is
21°C / 70°F. Range is
18°C / 64°F to
30°C / 86°F.
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET TEMP".
4 Press to confirm this setting. The current temperature is displayed.
5Press or to scroll to the desired temperature.
6Press to confirm this setting. Or press to cancel and
retain the current temperature.
7Press to exit.

62-11175 COMFORTPRO SERVICE MANUAL
1-10
Setting the START TEMPERATURE
1Press .
2Press or until
"TEMP START" is displayed, then
press .
TEMP START : SET TEMP
OFF
-10C 14F
OFF
HOURS
00000
APU
NOTICE
Factory Default Temperature Setting
-10°C / 14°F. Range is -
20°C / -4°F to
5°C / 41°F.
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET TEMP".
4Press to confirm this setting. The current start temperature
is displayed.
5Press or to scroll to the desired start temperature.
6Press to confirm this setting. Or press to cancel and
retain the current start temperature.
7Press to exit.
1.3.6 Cold Weather Watch
Turning Cold weather watch On and Off
1Press .
2Press or until
"TEMP START" is displayed, then
press .
You can set up the APU so that it automatically runs for a specified time
whenever the ambient temperature goes below a specified value. This
feature ensures that the APU engine and truck engine do not get so cold
that they will not start.
This feature is not intended to maintain a comfortable truck bunk
temperature; instead, see “Comfort Monitor”.
TEMP START
OFF
ON
OFF
HOURS
00000
APU
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "ON" or "OFF".
4Press to confirm this setting.
The current setting remains until you change it; turning off the APU or
manually starting the APU does not permanently cancel this setting.

62-11175 COMFORTPRO SERVICE MANUAL 1-11
Setting the DURATION
1Press .
2Press or until
"TEMP START" is displayed, then
press .
TEMP START : DURATION
OFF
1.0 hrs
OFF
HOURS
00000
APU
TEMP START
OFF
SET DURATION
OFF
HOURS
00000
APU
NOTICE
Factory Default Duration Setting is 2
hours. Range is 1 hr to 4 hrs.
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET DURATION".
4Press to confirm this setting. The current duration is displayed
in hours.
5Press or to scroll to the
amount of time you want the APU to
run before automatically shutting off.
6Press to confirm this setting.
Or press to cancel and retain the current start temperature.
7Press to exit.
You can set the maximum time that the APU is allowed to run continuously.
If the APU runs for longer than the specified time, it automatically shuts off.
You can then start it manually, if desired; the "run time" clock will start
counting again.
Turning MAXIMUM RUN TIME ON OR OFF
1Press .
2Press or until
"MAXIMUM RUN TIME" is displayed,
then press .
MAXIMUM RUN TIME
ON
HOURS
00000
APU
NOTICE
Factory Default Run Time Setting is 8
hours. Range is 2 to 24 hours.
1.3.7 Maximum Run Time
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "ON" or "OFF".
4Press to confirm this setting.
Setting the DESIRED RUN TIME
1Press .
2Press or until
"MAXIMUM RUN TIME" is displayed,
then press .
MAXIMUM RUN TIME
SET
HOURS
00000
APU
If "ENTER PASSWORD" is displayed, enter your password. If you do not
know the password, then you cannot set up this function (see page 1-5).
3Press or to display "SET".
4Press to confirm this setting.The current duration is displayed.
5Press or to scroll to the desired number of hours.
6Press to confirm this setting. Or press to cancel and
retain the current duration.
7Press to exit.