- Bergstrom Inc.

- Bergstrom Inc.
83.07
Parked Air Conditioner
General Information
Overview
The Bergstrom NITE (No Idle Thermal Environment)
parked, or no-idle, air conditioning system is a compact, electrically powered, 3000-BTU system. It is
designed to provide a means of air conditioning to
the sleeper area without having the engine running. It
is completely self-contained, and runs on 12-volt
deep-cycle batteries. The system is designed to
maintain cool air in the sleeper interior. For optimal
operation, the curtain between the cab and the
sleeper must be closed when using the A/C system.
The parked A/C unit will not cool down a hot sleeper
that has been sitting in the sun without the vehicle
A/C running. If the interior temperature is higher than
desired, start the engine and run the vehicle A/C system until the desired sleeper temperature is
achieved. This will help cool the sleeper to a temperature the parked A/C system can maintain. Once
the sleeper temperature is lowered, the system will
maintain a comfortable setting.
The unit is located under the lower bunk in the
sleeper compartment. The unit gets its intake air
from the under-bunk area through a grate in the top
panel. An air intake grille is located on the front panel
of the lower bunk. The outlet ducting runs from the
left side of the unit to an outlet near the bunk occupant’s face on the back wall of the sleeper. It is important to keep the air intake grille, and the area
under the bunk, free of objects that might block air
flow or put objectionable odors into the cooling air.
Air for the condenser is taken in from under the cab
and exhausted through another opening in the cab
floor.
The system receives power from four deep-cycle batteries located between the frame rails. These batteries are completely isolated from the starting batteries
to keep the starting batteries from being drawn down
during operation.
IMPORTANT: The refrigerant system in the
parked A/C unit is a sealed system, it is not serviceable. If problems occur; contact the NITE
line at 1-866-204-8570, or visit www.nitesystem.com.
side. It has a temperature control dial, and a fourposition mode selector switch. Turn the temperature
control dial to the left for cooling, and to the right for
heat. See Fig. 1. See Table 1 for a description of the
function of the mode switch.
The system must be turned off whenever it is not in
use, or the batteries may not charge properly. After
using the system, turn the mode switch to the OFF
position, even if the unit is not running.
1
2
3
4
5
6
08/29/2007
Century Class Trucks Workshop Manual, Supplement 28, December 2007
f831760
1. Temperature Control
Dial
2. Mode Switch
3. A/C Only
4. Heat Only
5. AUTO
6. Off
Fig. 1, Parked A/C and Heater Control Panel
Parked A/C and Heater Mode Switch Operation
Mode
Off
AUTO
Operation
The control panel for the parked A/C and heater is
located on the back wall of the sleeper near the left
AUTO
Heat Only
Function
Turns the unit off.
Allows the unit to automatically heat or
cool the sleeper, depending on the
temperature setting and the sleeper
temperature. Adjusts the compressor,
heater, and fans to keep temperature
constant.
Allows only the heat portion of the system
to run. Adjusts the heater only to keep the
temperature constant.
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83.07
Parked Air Conditioner
General Information
Parked A/C and Heater Mode Switch Operation
Mode
A/C Only
Function
Allows only the A/C portion of the system
to run. Adjusts compressor and fans only
to keep the temperature constant.
Table 1, Parked A/C and Heater Mode Switch
Operation
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Century Class Trucks Workshop Manual, Supplement 28, December 2007
Parked Air Conditioner
83.07
Safety Precautions
Safety Precautions
IMPORTANT: The refrigerant system on this unit
is not servicable. Do not attempt to open the
refrigerant system. The only reason you should
come in contact with the refrigerant is if there is
a leak in the system.
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83.07
Parked Air Conditioner
Control Panel Removal and Installation
Removal
4. Install the outlet grilles.
5. Connect the batteries.
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2. Remove the outlet grilles. See Fig. 1.
5
6
4
4
3
3
1
2
10/05/2007
1.
2.
3.
4.
Sleeper Back Wall
Plenum
Grille
Plenum Screws
f831769
5. Control Panel
6. Control Panel
Screws
Fig. 1, Plenum and Control Panel Installation
3. Remove the screws that hold the plenum to the
back wall of the sleeper.
4. Tilt the plenum out from the wall, and disconnect
the wires.
5. Remove the fasteners, and remove the control
panel.
Installation
1. Position the control panel in the opening in the
housing, and install the fasteners.
2. Connect the wires to the control panel.
3. Position the plenum, and install the fasteners.
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83.07
Parked Air Conditioner
Parked A/C Unit Replacement
Replacement
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
NOTE: Mark all wires for reference before disconnecting them.
2. Disconnect the harness and the battery cables at
the terminals under the sleeper floor. See Fig. 1.
f545124
10/02/2007
Fig. 1, Harness and Battery Cables
3. Raise and secure the lower bunk.
4. Disconnect the air duct from the outlet opening
on the left side of the unit.
5. Disconnect the wires that go to the control panel.
6. Remove the nuts at the corners of the unit.
NOTE: The unit weighs approximately 70 lb (32
kg), and it is awkward to handle in the tight confines of the sleeper. Be careful when lifting it, to
avoid personal injury or damaging the cab interior parts.
7. Lift the unit out of the under-bunk area.
8. Position the unit on the mounting studs in the
under bunk area, and install the mounting nuts.
9. Connect the wires to the control panel.
10. Attach the air duct to the outlet opening in the
left side of the unit.
11. Connect the harness and the battery cables to
the terminals under the sleeper floor.
12. Connect the batteries.
13. Lower the bunk.
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83.07
Parked Air Conditioner
Blower Replacement
Replacement
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2. Raise and secure the lower bunk.
3. Remove the top panel. See Fig. 1.
08/09/2007
f831748
Fig. 2, Inside Blower Fasteners
10/05/2007
f831746
Remove the indicated fasteners only.
Fig. 1, Top Access Panel
4. Remove the two fasteners on the inside panel of
the unit. See Fig. 2.
5. Remove the two fasteners on the outside of the
unit, below the outlet duct.
6. Disconnect the wire connector at the blower.
7. Lift the blower assembly out of the unit housing.
8. Position the blower assembly in the unit housing.
9. Connect the wire connector at the blower.
10. Install the blower mounting fasteners; two inside,
and two outside.
11. Connect the batteries.
12. Install the top panel.
13. Lower the bunk.
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Parked Air Conditioner
Condenser Fan Replacement
Replacement
1
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2. Raise and secure the lower bunk.
3. Remove the top panel. See Fig. 1.
1
2
1
08/10/2007
f831750
1. Fasteners (4)
2. Condenser Fan
Fig. 2, Condenser Fan Installation
10/05/2007
f831746
Remove the indicated fasteners only.
Fig. 1, Top Access Panels
4. Remove the fasteners from the condenser fan
assembly. See Fig. 2.
5. Cut any wire ties as needed, and disconnect the
wire connector from the condenser fan.
6. Remove the condenser fan assembly from the
unit housing.
7. Position the condenser fan assembly in the unit
housing, and install the fasteners.
8. Connect the wire connector and install wire ties
as needed.
9. Connect the batteries.
10. Install the top panel.
11. Lower the bunk.
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83.07
Parked Air Conditioner
Compressor Control Module Replacement
Replacement
CAUTION
When removing or installing the control module
housing, be very careful not to damage the exposed control board. Even a small chip or crack
in the control board can ruin it.
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2. Raise and secure the lower bunk.
3. Remove the top panel. See Fig. 1.
1
08/13/2007
f831751
1. Compressor Control Module
Fig. 2, Control-Module-Housing Fasteners
10/05/2007
f831746
Remove only the indicated fasteners.
Fig. 1, Top Access Panels
4. Remove the four control module housing fasteners on the side panel. See Fig. 2.
5. Remove the nut from the compressor cap, and
remove the compressor cap. See Fig. 3.
6. Mark the wires as needed, then disconnect the
wires from the compressor. See Fig. 4.
7. Disconnect the power supply wires.
8. Disconnect the connector from the harness to
the control board.
9. Carefully remove the compressor control module.
Century Class Trucks Workshop Manual, Supplement 28, December 2007
08/14/2007
f831752
Fig. 3, Compressor-Cap Nut
10. Connect the wire connectors to the compressor.
11. Install the compressor cap and nut.
12. Position the compressor control module in the
unit housing.
13. Connect the wire connectors to the power supply
and the control board.
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Parked Air Conditioner
Compressor Control Module Replacement
08/14/2007
f831753
Fig. 4, Compressor Wires
14. Install the compressor control module fasteners.
15. Connect the batteries.
16. Install the top panel.
17. Lower the bunk.
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Century Class Trucks Workshop Manual, Supplement 28, December 2007
83.07
Parked Air Conditioner
Freeze Switch Replacement
Replacement
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2
2. Raise and secure the lower bunk.
3. Remove the top panel. See Fig. 1.
1
08/30/2007
f831754
1. Wire Connector
2. Fastener
Fig. 2, Freeze Switch
10/05/2007
f831746
Remove only the indicated fasteners.
Fig. 1, Top Access Panels
4. Unplug the freeze switch.
2
5. Remove the fastener. See Fig. 2.
6. Remove the freeze switch probe from the evaporator coil, and pull the probe, wire, and rubber
grommet out the hole on the panel. See Fig. 3.
09/07/2007
7. Remove the freeze switch.
1. Probe
8. Insert the probe into the evaporator core in the
same location as the original. Install the grommet
in the hole in the panel.
1
f831755
2. Grommet
Fig. 3, Freeze Switch Probe
9. Position the new freeze switch and install the
fastener.
10. Connect the wire into the switch.
11. Connect the batteries.
12. Install the top panel.
13. Lower the bunk.
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Parked Air Conditioner
Unit Control Module Replacement
Replacement
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
2. Raise and secure the lower bunk.
3. Remove the top panel. See Fig. 1.
09/05/2007
f831756
Fig. 2, Control Module Wiring
10/05/2007
f831746
Remove only the indicated fasteners.
Fig. 1, Top Access Panel
3
4. Disconnect the three wire connectors from the
unit control module. See Fig. 2.
3
2
5. Remove the electrical box cover. See Fig. 3.
6. Disconnect the wires from the bottom of the
separator, under the sleeper. See Fig. 4.
NOTE: There may be a vapor barrier affixed to
the bottom of the unit, including electrical box. If
so, carefully cut it loose in order to be able to tilt
the electrical box out from the unit without damaging the vapor barrier.
7. Remove the four sheetmetal screws that hold the
electrical box to the front of the unit, and tilt the
electrical box away from the unit. See Fig. 5.
8. Remove the fasteners for the control module
mounting plate from the outside of the unit. See
Century Class Trucks Workshop Manual, Supplement 28, December 2007
1
10/02/2007
f831745
1. Electrical Box
2. Electrical Box Cover
3. Cover Fasteners
Fig. 3, Electrical Box Installation
Fig. 6. Slide the mounting plate out of the unit
with the control module attached.
9. Remove the control module fasteners, and remove the control module from the mounting
plate. See Fig. 7.
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83.07
Parked Air Conditioner
Unit Control Module Replacement
f545124
10/02/2007
Fig. 4, Under Cab Wires
08/13/2007
f831757
Fig. 6, Control Module Mounting-Plate Fasteners
3 4
2
3
4
10/05/2007
3
10/05/2007
1.
2.
3.
4.
3
1
f831763
Separator
Fuse Panel
Sheetmetal Screws, Electrical Box (4)
Fuse Panel Nuts
f831749
Fig. 7, Control Module Fastener
14. Connect the three wiring connectors to the control module.
15. Connect the batteries.
16. Install the top panel and electrical box cover.
17. Lower the bunk.
Fig. 5, Fuse Panel and Separator
10. Position the control module on the mounting
panel, and install the fasteners.
11. Position the mounting panel in the unit housing,
and install the fasteners from the outside.
12. Position the electrical box, and install the screws.
13. Connect the wires to the bottom of the separator,
under the sleeper.
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Century Class Trucks Workshop Manual, Supplement 28, December 2007
83.07
Parked Air Conditioner
Separator Replacement
Removal
1. Park the vehicle on a level surface, shut down
the engine, set the parking brakes, and chock
the tires. Disconnect the vehicle batteries.
5
2. Raise and secure the lower bunk.
4
3. Remove the electrical box cover. See Fig. 1.
3
6 3
3
2
1
2
09/13/2007
6
3
f545123
1. Separator
2. Separator Mounting
Nut
3. Terminal
4. Washer
5. Terminal Nut
6. Copper Buss Bars
Fig. 2, Separator Installation
3
3
2
1
10/02/2007
f831745
1. Electrical Box
2. Electrical Box Cover
3. Cover Fasteners
Fig. 1, Electrical Box Cover
4. Remove the nuts and washers from the terminals, and remove the two copper buss bars. See
Fig. 2.
5. Remove the separator mounting nuts, and remove the separator.
6. Position the new separator, and install the
mounting nuts.
7. Position the buss bars and install the mounting
nuts and washers.
8. Connect the batteries.
9. Install the electrical box cover.
10. Lower the bunk.
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Parked Air Conditioner
Troubleshooting
Operational Checks
Table 1 explains how to check the main components
of the system for proper operation.
Operational Checks
Component
Evaporator
Blower
Function
Operational Check
Draws cab air through the evaporator coils and
blows it through the ducting back to the cab.
The system is 100% recirculation.
Switch the NITE control to position 1; you must feel
air coming out of the duct louvers. Then switch the
NITE control to position 2; you must feel an increase
of the airflow coming out of the duct louvers. NOTE:
Make sure nothing blocks the air intake opening
(recirculation) on the NITE unit or the bunk.
There are two air intakes; one on the unit, and
one on the front lower panel of the bunk.
Condenser Fan
Compressor
Takes ambient outside air from under the
sleeper floor and blows it through the
condenser coil to cool it, then exhausts it
through the floor outside the vehicle.
With the unit running, go under the sleeper and
check that air is flowing into the unit at the intake,
and out of the condenser air outlet.
Compresses the refrigerant and moves it
through the system.
With the compressor running at LOW speed, listen or
feel the compressor speed by its sound and vibration.
Wait 1 minute. Then set the control to HIGH speed:
you must notice a change in the sound and/or
vibration of the unit when the compressor speed
changes.
Table 1, Operational Checks
Unit Electrical Power Checking
1. Check the NITE unit voltage.
1.1
Locate the power supply cables (red and
black cables) close to the unit.
1.2
Check the voltage.
When the NITE batteries are fully
charged, and when the control position is
on HIGH, you must read between 12 and
12.5 volts.
2. Check the NITE unit current.
2.1
Switch the NITE unit control to the HIGH
position.
2.2
Using a clamp-on inductive ammeter,
measure the current on the NITE unit
power supply (red) cable. You must read
between 27 and 35 Amps.
when the outside temperature is between 90 and
95°F (195 and 205°C), measure the temperature directly at one of the duct louvers. You must read between 55 and 62°F (13 and 17°C).
Condenser Outlet Temperature
As described earlier in this document the NITE unit
pulls air from outside, under the sleeper floor, to cool
down the condenser coil, then the air is rejected to
the outside from the sleeper floor too. When the
NITE unit is running in HIGH position, go under the
sleeper and locate the condenser air outlet (rectangle
opening with a screen). The temperature at the condenser outlet must be 10 to 20°F (6 to 12°C) higher
than the outside temperature.
Temperature/Amperage Testing
1. Set mode to A/C only.
2. Set the temperature setting to max cold.
Air Temperature at the Louvers
Check the louvers temperature: when the NITE unit
control is on HIGH position, when the sleeper temperature is between 75 and 80°F (24 and 27°C), and
Century Class Trucks Workshop Manual, Supplement 28, December 2007
3. Place your hand on the sensor so it detects high
temperature.
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Parked Air Conditioner
Troubleshooting
4. Open the vehicle doors and allow the ambient
temperature to stabilize on the condenser and
unit.
the separator, use the ground terminal on the
separator. Both voltage readings should be the
same (approximately 12 volts).
5. Let the unit run about 10 minutes before measuring the temperature and current.
Table 2 shows temperature and amperage parameters for testing the system.
Separator Electrical Checking,
Engine OFF
Separator Electrical Checking,
Engine Running
The separator controls the charging of the batteries
as follows.
• When the engine is running, the alternator
charges the vehicle batteries only, until the vehicle battery voltage reaches 13.2 volts. During
this period, the separator is open and the NITE
batteries are not being charged.
1. Check for loose electrical connections.
2. Check that the installation is wired according to
the electrical diagram. See Specifications, 400
for wiring diagrams.
3. Check that the 16 gauge ground wire is connected to the bottom blade terminal of the separator on one end, and to a good ground on the
other end.
4. Check that the batteries are properly connected.
5. Make sure the battery ground cable is connected
to a good ground.
6. Make sure the NITE unit power cables are connected to the correct terminals of the NITE batteries. The red cable goes to the positive terminal; the black cable goes to the ground.
7. Check that the voltage on the vehicle batteries is
the same as the voltage at the separator (main
batteries side). When checking the voltage on
the separator, use the ground terminal on the
separator. Both voltage readings should be the
same.
8. Check that the voltage on the NITE batteries is
the same as the voltage on the separator ("AUX"
batteries side). When you check the voltage at
• When the vehicle batteries reach 13.2 volts,
the separator closes, allowing the NITE batteries to charge.
1. With the engine running, check the voltage of the
vehicle batteries. It should be higher than the
voltage when the engine is OFF, more than 13
volts.
2. Check that the separator is operating properly.
When the vehicle battery voltage reaches 13.2
volts, the separator closes, and the system starts
charging the NITE batteries. There is an audible
“click” when the separator closes.
3. With the engine running, check the voltage of the
NITE batteries. It should be higher than the voltage when the engine is OFF, and approximately
the same as the vehicle batteries.
4. Verify that the separator is allowing the NITE batteries to charge. Using a clamp-on-type inductive
ammeter, on the cable that connects the separator to the NITE batteries positive terminal, measure the amps going to the NITE batteries. It
should read more than 0 amps.
Temperature and Amperage Parameters
Ambient Temperature: °F (°C)
Louver Temperature: °F (°C)
Amps
65 (18)
47–53 (8–12)
21–27
66 (19)
48–54 (9–12)
21–27
67 (19)
49–55 (9–13)
22–28
68 (20)
50–56 (10–13)
22–28
69 (21)
51–57 (11–14)
23–29
70 (21)
52–58 (11–14)
23–29
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Century Class Trucks Workshop Manual, Supplement 28, December 2007
83.07
Parked Air Conditioner
Troubleshooting
Temperature and Amperage Parameters
Ambient Temperature: °F (°C)
Louver Temperature: °F (°C)
Amps
71 (22)
54–60 (12–16)
24–30
72 (22)
55–61 (13–16)
24–30
73 (23)
56–62 (13–17)
25–31
74 (23)
57–63 (14–17)
25–31
75 (24)
58–64 (14–18)
26–32
76 (24)
59–65 (15–18)
26–32
77 (25)
60–66 (16–19)
27–33
78 (26)
60–66 (16–19)
27–33
79 (26)
61–67 (16–19)
27–33
80 (27)
62–68 (17–20)
28–34
81 (27)
63–69 (17–21)
28–34
82 (28)
64–70 (18–21)
29–35
83 (28)
65–71 (18–22)
29–35
84 (29)
66–72 (19–22)
30–36
85 (29)
67–73 (19–23)
30–36
86 (30)
68–74 (20–23)
30–36
87 (31)
69–75 (21–24)
31–37
88 (31)
69–75 (21–24)
31–37
89 (32)
70–76 (21–24)
32–38
90 (32)
71–77 (22–25)
32–38
91 (33)
72–78 (22–26)
32–38
92 (33)
73–79 (23–26)
33–39
93 (34)
73–79 (23–26)
33–39
94 (34)
74–80 (23–27)
33–39
95 (35)
75–81 (24–27)
34–40
96 (36)
76–82 (24–28)
34–40
97 (36)
77–83 (25–28)
35–41
98 (37)
77–83 (25–28)
35–41
99 (37)
78–84 (26–29)
35–41
100 (38)
79–85 (26–29)
36–42
101 (38)
80–86 (27–30)
36–42
102 (39)
80–86 (27–30)
36–42
103 (39)
81–87 (27–31)
37–43
104 (40)
82–88 (28–31)
37–43
105 (41)
82–88 (28–31)
37–43
Table 2, Temperature and Amperage Parameters
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Parked Air Conditioner
Specifications
Table 1 details technical specifications of the NITE
system as installed on Century Class Trucks. Table 2
shows temperature and amperage parameters for
testing the system.
Figure 1, Fig. 2, and Fig. 3 show the wiring diagram
for the Parked HVAC system.
System Specifications
A/C
Power
Cooling Capacity
3600 BTU/Hour
Voltage
12 Volts DC
System Power
400–405 Watts
Dimensions
22 x 16 x 11 Inch (560 x 406 x 280 mm)
Capacity
440 amp hours
Battery Life
2+ years
Operation time
10–12 hours
Recharge time
4–6 hours
Battery count
4
Table 1, System Specifications
Temperature and Amperage Parameters
Ambient Temperature: °F (°C)
Louver Temperature: °F (°C)
Amps
65 (18)
47–53 (8–12)
21–27
66 (19)
48–54 (9–12)
21–27
67 (19)
49–55 (9–13)
22–28
68 (20)
50–56 (10–13)
22–28
69 (21)
51–57 (11–14)
23–29
70 (21)
52–58 (11–14)
23–29
71 (22)
54–60 (12–16)
24–30
72 (22)
55–61 (13–16)
24–30
73 (23)
56–62 (13–17)
25–31
74 (23)
57–63 (14–17)
25–31
75 (24)
58–64 (14–18)
26–32
76 (24)
59–65 (15–18)
26–32
77 (25)
60–66 (16–19)
27–33
78 (26)
60–66 (16–19)
27–33
79 (26)
61–67 (16–19)
27–33
80 (27)
62–68 (17–20)
28–34
81 (27)
63–69 (17–21)
28–34
82 (28)
64–70 (18–21)
29–35
83 (28)
65–71 (18–22)
29–35
84 (29)
66–72 (19–22)
30–36
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Parked Air Conditioner
Specifications
Temperature and Amperage Parameters
Ambient Temperature: °F (°C)
Louver Temperature: °F (°C)
Amps
85 (29)
67–73 (19–23)
30–36
86 (30)
68–74 (20–23)
30–36
87 (31)
69–75 (21–24)
31–37
88 (31)
69–75 (21–24)
31–37
89 (32)
70–76 (21–24)
32–38
90 (32)
71–77 (22–25)
32–38
91 (33)
72–78 (22–26)
32–38
92 (33)
73–79 (23–26)
33–39
93 (34)
73–79 (23–26)
33–39
94 (34)
74–80 (23–27)
33–39
95 (35)
75–81 (24–27)
34–40
96 (36)
76–82 (24–28)
34–40
97 (36)
77–83 (25–28)
35–41
98 (37)
77–83 (25–28)
35–41
99 (37)
78–84 (26–29)
35–41
100 (38)
79–85 (26–29)
36–42
101 (38)
80–86 (27–30)
36–42
102 (39)
80–86 (27–30)
36–42
103 (39)
81–87 (27–31)
37–43
104 (40)
82–88 (28–31)
37–43
105 (41)
82–88 (28–31)
37–43
Table 2, Temperature and Amperage Parameters
400/2
Century Class Trucks Workshop Manual, Supplement 28, December 2007
83.07
Parked Air Conditioner
Specifications
Fig. 2
1
+
1
1
B
L
M
H
C
1
2
1
2
6.35MM BLADE
−
B
L
M
H
C
HI PRESS
J23
1
AMP
1−480698−0
AMP
1−480699−0
1
SW ROTARY 2P−3W
MUENSTER 754C
−
CON1
+
1
2
FREEZE SWITCH
EVAP. FAN
2
1
2
1
A
NEED REMOTE
SENSE WIRED
CONDENSER FAN
A
SW1
+
1
J2
2
J1
ALTERNATOR
Fig. 3
A/C UNIT
CONTROL PANEL
A
B
A
B
PACKARD
12034344
PACKARD
12034343
A
BACKLIGHT
1
2
3
1
2
3
4
−
2
POT
1
2
3
4
AMP
174921−1
CONTROL PCB ASSEMBLY
MINIFIT JR.
12V
COND_FAN
GROUND
TO STARTING BATTERIES
1
2
3
4
5
6
EVAP_FAN
EVAP_PWR
ESPAR
AIRTRONIC 2
FUEL
OPERATED
HEATER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AMP
350433−1
GROUND
HEAT_LEVEL
12V_HEATER
HEAT_ENABLE
FUEL_PUMP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
12V_SW
12V
GND
MODE_SW1
MODE_SW2
MODE_SW3
SET_TEMP
5V_BUFFERED
A
B
C
D
E
F
G
H
PKD 12047886
PKD 12045688
1
5V_BUFFERED
NOTE:
WEBASTO HEATER USES DIFFERENT
HEATER INTERFACE HARNESS
MOLEX
39−01−2120
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
PKD 12066195
PKD 12064998
MAIN BATT JUNCTION
J14
1
2
3
4
5
6
7
8
9
10
11
12
SET_TEMP
HI_PRESS
MODE_SW1
MODE_SW2
MODE_SW3
FREEZE_SW
A
B
C
D
E
F
G
H
1
2
ELECTRICAL CENTER
2
PWR_SWITCH
HEAT_ENABLE
COMP_ENABLE
SLPR_TEMP
HEAT_LEVEL
RX
TX
COMP_SPD
1
2
3
4
5
6
7
8
MOLEX
39−01−2080
LS3
A
B
C
D
PARK BRAKE ENABLE SWITCH
87A
TEST CONNECTOR
30
PARK_SW
87
85
86
RELAY
AHR1
FUEL PUMP
1
2
LS2
PACKARD
15300027
BATTERY SEPARATOR
SP 3104
1 START
AUX 2
A
B
C
D
E
F
G
H
J
K
87A
30
87
85
86
F1
BMD
LOCK
ALRM
RCM
DMD
LED
ISW
GND
ABAT
SBAT
RELAY
LS1
30
50A MAXI
87
85
86
F2
70A ISO RELAY
15A MINI
F3
Compressor Control
12V_COMPRESSOR
GND_COMPRESSOR
PARK BATT JUNCTION
A
B
PACKARD
12129939
1
2
20A MINI
GROUND JUNCTION
2
1
GROUND
COND_FAN
J10
COMP_SPD
PARKED HVAC
SYSTEM BATTERIES
BT1
BATTERY
J9
SLPR TEMP
BT2
t
1
2
1
2
SLPR_TEMP
GND
Compressor
A
B
PACKARD
12129938
1
2
3
4
5
6
MOLEX
50−57−9406
PKD 12047662
BATTERY
10/08/2007
f545158
Fig. 1, Parked HVAC Wiring
Century Class Trucks Workshop Manual, Supplement 28, December 2007
400/3
83.07
Parked Air Conditioner
Specifications
CONTROL PANEL
J1
1
+
ALTERNATOR
B
L
M
H
C
SW ROTARY 2P−3W
A
MUENSTER 754C
1
2
1
2
1
2
3
4
1
2
3
4
2
−
NEED REMOTE
SENSE WIRED
J2
B
L
M
H
C
BACKLIGHT
POT
MINIFIT JR.
TO STARTING BATTERIES
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ESPAR
AIRTRONIC 2
FUEL
OPERATED
HEATER
GROUND
HEAT_LEVEL
12V_HEATER
HEAT_ENABLE
FUEL_PUMP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
12V_SW
12V
GND
MODE_SW1
MODE_SW2
MODE_SW3
SET_TEMP
5V_BUFFERED
1
A
B
C
D
E
F
G
H
PKD 12047886
PKD 12045688
Fig. 3
NOTE:
WEBASTO HEATER USES DIFFERENT
HEATER INTERFACE HARNESS
MAIN BATT JUNCTION
J14
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
PKD 12066195
PKD 12064998
ELECTRICAL CENTER
2
LS3
A
B
C
D
PARK BRAKE ENABLE SWITCH
87A
30
PARK_SW
87
85
86
RELAY
AHR1
FUEL PUMP
1
2
LS2
PACKARD
15300027
BATTERY SEPARATOR
SP 3104
1
START
2
AUX
A
B
C
D
E
F
G
H
J
K
87A
30
87
85
86
F1
BMD
LOCK
ALRM
RCM
DMD
LED
ISW
GND
ABAT
SBAT
RELAY
LS1
30
50A MAXI
87
85
86
F2
70A ISO RELAY
15A MINI
F3
1
2
20A MINI
2
GROUND JUNCTION
1
PARK BATT JUNCTION
J10
PARKED HVAC
SYSTEM BATTERIES
BT1
BATTERY
SLPR TEMP
BT2
t
1
2
J9
1
2
SLPR_TEMP
GND
PKD 12047662
BATTERY
10/08/2007
f545159
Fig. 2, Parked HVAC Wiring (expanded, part 1)
400/4
Century Class Trucks Workshop Manual, Supplement 28, December 2007
83.07
Parked Air Conditioner
Specifications
1
A/C UNIT
+
1
1
CONDENSER FAN
A
SW1
1
2
1
2
6.35MM BLADE
−
HI PRESS
2
J23
1
AMP
1−480698−0
AMP
1−480699−0
1
1
CON1
+
FREEZE SWITCH
EVAP. FAN
A
B
A
B
PACKARD
12034344
PACKARD
12034343
A
1
2
3
2
−
AMP
174921−1
CONTROL PCB ASSEMBLY
12V
COND_FAN
GROUND
1
2
3
4
5
6
EVAP_FAN
EVAP_PWR
AMP
350433−1
SET_TEMP
HI_PRESS
MODE_SW1
MODE_SW2
MODE_SW3
FREEZE_SW
Fig. 2
5V_BUFFERED
1
2
3
4
5
6
7
8
9
10
11
12
MOLEX
39−01−2120
PWR_SWITCH
HEAT_ENABLE
COMP_ENABLE
SLPR_TEMP
HEAT_LEVEL
RX
TX
COMP_SPD
1
2
1
2
3
4
5
6
7
8
MOLEX
39−01−2080
TEST CONNECTOR
Compressor Control
12V_COMPRESSOR
GND_COMPRESSOR
A
B
PACKARD
12129939
PACKARD
12129938
GROUND
COND_FAN
COMP_SPD
Compressor
A
B
1
2
3
4
5
6
MOLEX
50−57−9406
10/08/2007
f545160
Fig. 3, Parked HVAC Wiring (expanded, part 2)
Century Class Trucks Workshop Manual, Supplement 28, December 2007
400/5
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