Valeo CC 646 MS User manual

Rev.01/ November 2023
Code: 036-00366-001
Owner’s Manual
Warranty Certificate
CC 646 MS - CC 676 MS
AIR CONDITIONING ARTICULATED CITYBUS

INDEX CC 646 MS - CC 676 MS
OBSERVATION: to get the best air conditioner
performance we recommend that you read this manual
carefully before starting operation.
Keep this manual with your vehicle for reference.
INTRODUCTION_____________________________________________________________
3
WARRANTY TERMS
Warrant Terms__________________________________________
4
PREVENTIVE MAINTENANCE
Preventive Maintenance Frequency Check List_____________________________
5
Refrigerant Gas R134a_______________________________
6
Dry Filter________________________________________
6
Compressor Sealing Part_____________________________________
6
Heating system________________________________________
6
Oil_________________________________________________________
6
Ducts____________________________________________________
6
Pulley Belts___________________________________________________
6
EQUIPMENT IDENTIFICATION (ID)
- Identification Tag___________________________________________
7
OPERATING THE AIR CONDITIONER
1- Operating the Air Conditioner____________________
8
CONTROLADOR
2- SCB 400-410 Controllers _____________________________________________________
10
2.1- Control Panel Description_____________________________________________
10
2.2- Operation Instructions____________________________________________
11
2.3- Auto Mode_________________________________________
11
2.4- ON/OFF Air Conditioner Compressor______________________________________
12
2.5- Heating Mode_____________________________________
12
2.6- Desired temperature level SET POINT___________________________________________
12
2.7- Evaporator fan speed configuration_______________________
13
2.8- Enabling / Disabling the ventilation function___________________________________
13
2.9- Faults (errors)_____________________________________________________
14
2.10- SCB2000 Controller Operation_________________________________
15
EQUIPMENT DESCRIPTION
3- Technical Data Sheets________________________________
16
3.1- Condenser Components________________________________________
17
3.2- Evaporator Components______________________________________
18
3.3- Bock FKX Compressor Components_________________________
19
3.4- Electric Components____________________________________
20
SAFETY PRECAUTION
4- Safety Precaution______________________________________
21
SUSTAINABILITY
5- Product Discard______________________________________
22

CC 646 MS - CC 676 MSINTRODUCTION
VALEO Climatização do Brasil - Veículos Comerciais S/A offers a full line of
equipment for bus air conditioning systems for vans, micro and midi buses,
commuter, articulated, coaches and double-deckers.
Air conditioning system that is modern and high quality, the products of
VALEO Climatização do Brasil - Veículos Comerciais S/A have been
developed looking for comfort and tranquility to passengers that uses the
public transport.
However, you need to take care to assure a good use and operation of the
air conditioning system, and then you can obtain a better performance of its
technology resources.
It is mandatory to do the preventive and corrective maintenance
procedures, they must be accomplished by experts or dully technicians.
Looking for improving and updating the refrigeration technical teams, this
manual describes the fundamentals of our air conditioning system based on
the most important thermodynamic formulas.
You can find operation instructions of VALEO Climatização do Brasil - Veículos
Comerciais S/A air conditioning too, besides it advises you to follow
technical procedures of adequate preventive maintenance obeying
environmental and safety rules.
Frequent training for technical team make them able to get right diagnosis
from equipment (appliances) to accomplish the servicing.
correctly with quality and responsibility, assuring to the whole fleet a
perfect operation of VALEO Climatização do Brasil - Veículos Comerciais S/A
equipment.
3

7 - The Warrant Loses its Validity
a) If the installation or use of the product is not in accordance with the VALEO
Climatização do Brasil - Veículos Comerciais S/A technical recommendations.
b) If the product suffers any damage caused by improper use, neglect, accident,
failures caused by external agents and even lack of maintenance (see owner's
manual) or services performed by unqualified person.
WARRANTY TERMS
Warrant Terms
VALEO Climatização do Brasil - Veículos Comerciais S/A warrants its products for
two-years period in accordance with the terms listed below:
1 - The warranty will be valid for the period above specified, counting from the
date when the equipment is installed in keeping with the warrant certificate,
even after the property there of has ben transfered.
2 – Should the equipment be installed by a third part, VALEO Climatização do
Brasil - Veículos Comerciais S/A warrant only the product and not its instalations.
3 - During the stipulated period, the warranty completely covers the workman-
ship and spare parts used to repair defects duly identified as being:
premature failure of material and components defects used on its manufacture.
4 - Only a techinician from the VALEO Climatização do Brasil - Veículos Comerciais
S/A authorized network of services is qualified to repair the defects coverd
under the warranty.
5 - The warranty approval is subject to the technical analysis of the defects
shown in the components and operational conditions to which the equipment
has been subjected.
6 - No claims will be accepted if the vehicle is still in use after the defect is
found, even if there is lack of pieces, delay in transportation or any other such
incident.
c) If the warranty certificate and/or the serial number of the product are
adulterated, overwritten or damaged.
d) If defects or unsatisfactory performance are caused by the use of non original
spare parts and in disagreement with the technical specifications from VALEO
Climatização do Brasil - Veículos Comerciais S/A.
8 - The Warranty Does Not Cover
a) Displacement of the bus for repairing of the equipment. In case the customer
requests to be attended in the same place where products is operating, the
collection or not of the visitation charge will be the criterion of the authorized
service provider.
b) The attending to the consumer, free or paid, in cities that do not have
authorized services providers. So the expenses with displacement are the sole
responsibility of the owner.
c) Lack of proper preventive maintenance, as described in the preventive
maintenance item in this manual.
d) Replacement of bearings, belts, filters in general and lubricating oil, since
they are considered items of natural wear.
Bearings, belts and alternators have limited warranty as follows:
- Bearings in general: 60,000km or 2 years, whichever occurs sooner.
- Belts in general: 20,000km or 3 months, whichever occurs sooner.
- SEG Alternators: 1 year with no mileage limit.
- Prestolite Alternators: 2 years without mileage limit.
For the items listed above, the conditions established in these warranty terms
and the technical specifications of the respective manufacturer must be
respected.
e) Loss or loss of profits caused by the stoppage of the vehicle due to
non-operation of the equipment.
CC 646 MS - CC 676 MS
4

- Preventive Maintenance Frequency Check List
CC 646 MS - CC 676 MSPREVENTIVE MAINTENANCE
1 - Clean or change the return air filter.
2 - Check out the belt stretchiness condition and compressor with alternator alignment, observing the wear and tear of them.
3 - Check the water level of the radiator reservoir. See note (*)
1-Accomplishtheweeklychecklist.
2 - Clean the condenser capillary tube coil (Apply only water and neutral non-aggressive soup to cooper and aluminum). See note (**)
3 - Check if the evaporator hatches are closed to avoid air intake into the equipment.
4 - Check the refrigerant charge: wait 15 minutes, it has to flow through the liquid display without bulb formation.
5 - Check the compressor oil level: wait 15 minutes, it must be 3/4 up to 1/4 full at oil display.
6 - Test the equipment operation functions: cool / fan (high and low speed) / heat / dry (air renewing) modes.
7 - Lubricate the components of the compressor support. It includes articulation (elbows), axles, bushing and pulleys, if necessary.
8 - Operate the heating system (if any) for at least 30 minutes.
1-Accomplishthemonthlychecklist.
2 - Measure the exhaust suction pressure, temperature and suction line condition.
3 - Check the tightening of alternator potency cables fuses in general, electric board and start motor.
4 - Measure the condenser and evaporator fan flow consumption (check their air outflow).
5 - Measure the electromagnetic clutch coil.
6 - Measure the Voltage and Current from alternator.
1-Accomplishthetrimestralchecklist.
2 - Clean the evaporator capillary tube coil (Apply only water and neutral non-aggressive soup to cooper and aluminum). See note (**)
3 - Clean the evaporator drain.
4 - Check out the oil retainer felt of the compressor sealing part.
5 - Look carefully, if there is any leakage at coupling spots: oil leakage, refrigerant leakage.
Check if there are any loose, free, damaged, broken, worn parts, rusty, melting, cracked or bad fractioning to the bus body.
1-Accomplishthesemesterchecklist.
2 - Test the compressor efficiency at 1500 RPM.
3 - Make notes about the compressor oil pressure at 1000 RPM.
4 - Check the opening and closing pressures of high and low pressure switches.
5 - Check the screws or bolts that attach the compressor support and equipment, checking the right torque.
6 - Clean the air conditioning body getting rid of any dust/scrap at components: evaporator, condenser, clutch compressor, alternator, alternator,
relay and control board. See note (**)
IMPORTANT: If you do not accomplish the preventive maintenance check list as above, it implies to total or partial loss of warranty coverage.
(**): when cleaning using water, protect electrical and electronic components to prevent damage.
The actions of preventive maintenance written in this manual have been based on normal conditions. Just in case of environment contaminated and bad weather
conditions, then you must do the maintenance more frequent.
WEEKLY
MONTHLY
NOTES (*): if necessary, fill it in with water and additives, follow the recommendations of the OEM Body Builder.
YEARLY
SEMESTER
TRIMESTRAL
5

CC 646 MS - CC 676 MSPREVENTIVE MAINTENANCE
SAY NO TO RECONDITIONED PARTS
ATTENTION: under no circumstances, refrigerant cannot be spoiled at the
atmosphere.
IMPORTANT: check reservoir water level. If necessary, fill it in with water
and additives, follow the recommendations of the OEM Body Builder.
- Refrigerant Gas R134a
VALEO Climatização do Brasil - Veículos Comerciais S/A products apply for
R 134a. The se of different type of gas, low quality or from unknown brands will
cause low performance from the refrigeration and damage the equipment
components. - Ducts
The cleaning of the air ducts must be done every tree months, it can be earlier,
depending on: the frequency of operation of the air conditioning system,
quantity of passengers and resistivity of the environment where it is driven. This
cleaning is the responsibility of the vehicle owner´s only, he is in charge of this
cleaning in order to offer good air quality to his passengers.
NOTE: ducts are components of the bus body.
- Pulley Belts
In order to increase the lifetime of the belts, the strength/stretchiness must be
as low as possible, but working, not leaving them skidding without any friction.
Too low stretchiness on the pulley belts can cause overheat and too much
skidding, causing early break.
Too much stretched belts diminish their lifetime and from roll bearing and from
sleeves, this problem can cause engine interior and compressor damage.
After changing the belts, check their stretchiness back again after 48 working hours.
It is recommended not use different brands. Install assemblies with the same
diameter/length of the series and do not apply new belts beside old ones.
Putting the assembly into action without one or two belts for a long time can
cause a damage inside the “v” groove of the pulley. It will cause wear in that
“v” groove, so the new belt may not be stretched accordingly.
The application of reconditioned parts will diminish the air
conditioning efficiency, will overcharge the electric system causing
early brake of the compressor and set a fire!
- Oil
We recommend you that you shall preventively change the air system oil every
two years or 10.000 working hours, whatever becomes first.
- Dry Filter
We recommend that you shall preventively change the drier filter every 3 years.
Just in case, you need to refill in the equipment with gas, we recommend you
replace to a new filter to extinguish any dirt out of the system.
- Heating system
We recommend that you enable the heating system frequently (once a month)
to prevent the buildup of solid system particles that lodge in the hot air shutoff
valve seat.
- Compressor Sealing Part
In order to avoid leakage at the sealing part of the compressor due to lack of
lubrication, then the air conditioning must be working at cool mode for at least
15 minutes, once every 15 days.
The sealing part is lubricated by the compressor oil and in its normal operation
allows a small leakage of 0.05 ml per hour under operation.
Check frequently the reservoir and/or felt then remove the excess of it.
Dispose the old oil as your Country regulations and laws.
6

PREVENTIVE MAINTENANCE - IDENTIFICAÇÃO DO EQUIPAMENTO CC 646 MS - CC 676 MS
IMPORTANT: the vehicle owner must do preventive maintenance actions.
If you do not do the preventive maintenance as described in this chapter,
it implies you lose partially or full warranty coverage.
ATTENTION: Just in case a problem happens in the refrigeration system, then it
must be repaired in an authorized shop or qualified professional.
If a third party installs the equipment, VALEO Climatização do Brasil - Veículos
Comerciais S/A, guarantees only the product, not the installation of it.
The following items are in charge of the OEM Plant (Bus Body Builder).
• Tubes, hoses, drains and wiring harness:
Bad attachment. Leakage at connections and welding points. Damages due to
frictioning / chassis and components frictioning or bad installed.
• Alternator/Compressor Support:
Excess or lack of torque at attaching screws/bolts. Assembly is out of project
designs. Pulleys are not aligned, excess or lack of stretchiness at the belts and
pulleys.
• Gas Charge Process:
Leakage test procedure. Vacuum process and refrigerant gas charge.
Note: in case the installation is bad, VALEO Agent Authorized Service Net will
have to call the OEM Plant first, then get an authorization to do the service,
print and issue the Invoice of repairs.
Identification Tag
It is very important, when you need to ask for spare parts or after sales parts,
and similar ones, customer must identify the model of the air conditioning,
telling the series number, model and manufacturing date.
This information can be found in the Air Conditioning Warranty Certificate and ID
tag.
Application information regarding to: series and bus body model, series and
chassis model are very important to identify which parts the equipment carries.
In order to identify the bus body and chassis, you need to check the bus body
builder manual.
The refrigerant gas amount
can vary according to
application.
7

OPERATING THE AIR CONDITIONER
1- Operating the Air Conditioner
Note: Illustrative drawing.
16 14
2
8
1
7
7
6
6
11
5
54
3
12
17
17
9
9
10
15
13
13
11
CC 646 MS - CC 676 MS
8

Condenser Fan
Condenser
Dryer filter
Expansion Thermostatic Valve
Compressor
MECHANIC SYSTEM
Compressor Operation
Evaporator Blower
Temperature Sensor
Pressure Switches
ELECTRIC SYSTEM
Evaporators
Controller
Relay Board
Air filter
Air circulation
Drain
MECHANIC SYSTEM
ELECTRIC SYSTEM
1
6
12
13
14
15
16
7
8
9
10
11
2
3
4
5
CC 646 MS - CC 676 MS
Air refrechment
17
AIR CONDITIONING OPERATION
Refrigerant Fluid
It is inside the air conditioning equipment, inside the
system. It works absorbing the heat from the interior
/ room of the vehicle, at the evaporator, and then it
goes to the condenser where the heat is thrown to
the outside. VALEO Climatização do Brasil - Veículos
Comerciais S/A, products apply refrigerant R134a,
according to the Protection Environmental Law.
When it is working, the compressor sucks the refrigerant
fluid from evaporator at gaseous state and under low
pressure, compressing it, so temperature and pressure
increase, then the compressor puts it into the condenser.
Its main goal is dissipate the heat out, which was
absorbed by the refrigerant fluid along the
refrigeration system.
At the condenser, the overheat refrigerant fluid is
sent to outside losing its force, changing from
gaseous state to liquid state.
It has the purpose of retaining impurities and/or
moisture that can exist in the system, preventing
them from leaking into the expansion valve.
Valve hinders the refrigerant inlet that comes from
de condenser at high pressure and its goal is adjust
the refrigerant gas flow that passed by the
evaporator looking for making the pressure steady
and temperature at the capillary tubes output.
Now at evaporators, the refrigerant fluid, at low
pressure, turns from liquid to gaseous state,
absorbing the interior heat of the vehicle in this
process.
Now at evaporators, the refrigerant fluid, at low
pressure, turns from liquid to gaseous state,
absorbing the interior heat of the vehicle in this
process.
Air being cooled by the evaporator, then it follows
to the bus interior through fans.
It is a way to get the condensed moisture from
evaporator tubes from the condensed tray to putting
out.
It is installed in the instrument panel, it offers to the
driver to set-point of temperature, to see by display the
interior temperature, offering full climatic control inside
de bus.
Set-point: it is the temperature the driver wishes to set
inside the vehicle for passengers.
Relay board has the controller controls, condenser fan
control, evaporator control and compressor control.
Condenser fan and the compressor will only work at
“Cool Mode”.
Evaporator blower are working at cool and fan modes,
fans can be set in two speeds.
Sped control can be manual or automatic.
It is started up by the vehicle engine though a
pulley-and-belt system and put into action by an
electromagnetic clutch when air conditioning is
operating at “Cool Mode”.
The interior temperature is measured by the
temperature sensor placed at the air return spot.
Pressure switches are electric devices that monitor the air
conditioning equipment operation pressure. Every time a
strong change happens from the NORMAL temperature,
they turn off the compressor immediately to avoid break.
Observation: pressures are always monitored, even if the
air conditioning is turned off.
This permits the entry of the exernal in order to expel
unwanted odors and impurities from the vehicle.
9

CONTROLLERS
The SCB400 and SCB410 controllers are systems designed to control HVAC
components (heating, ventilation, cooling). In buses, for example, for ceiling air
conditioning systems, it is composed of control parts installed on the panel
(control device such as human-machine interface) and a relay board.
Controllers are available in basic (SCB400) and full (SCB410) versions. In the
basic version, the control element allows the user to control the air conditioning
system with cooling functions.
The full version has an optional heating function in addition to those standard
ones provided and can be cooling and ventilation. The controller for cooling
function can operate automatically. For this, the user simply has to set the
desired room temperature and turn on the air conditioner.
The operation described above applies to the following air conditioning systems:
SCB400:
• Air conditioning system (AC)
SCB410:
• air conditioning system (AC)
• with cooling and ventilation (VAC) function
• with cooling and heating (HAC) function
• with heating, ventilation and air conditioning (HVAC) function
The SCB400 and SCB410 AC controllers have basically the same components.
See below Functions and description.
2- SCB 400-410 Controllers 2.1- Control Panel Description
Item Description Function
1 Display Current room temperature and an error
warning.
2 Status light It shows an enabled function
(red status light on means it is enabled).
3 On/off button ON and OFF switch from control panel.
4 Auto button Evaporator Fan Automatic Start Up.
5 AC button Enable or Disable the cooling function.
6Evaporator fan speed button Evaporator Fan Manual Speed Control.
7Evaporator fan speed display It shows the current speed of evaporator fans.
8Temperature desired UP (set-point) button You can INCREASE the right temperature you
want to leave into the room.
9Temperature desired DOWN (set-point) button You can DECREASE the right temperature you
want to leave into the room.
10 Ventilation button On and OFF the recirculation function.
11 Free button Free.
SCB400 SCB410
1
3
9
8
5
4
2
6
7
2
2
3
5
4
2
2
2
1
9
8
6
7
10 11
CC 646 MS - CC 676 MS
10

in Standby
Attention: if the return (back) temperature is below the desired room
temperature, then the device enables the heating system automatically
(SBU410 only) and outputs to the floor convector solenoids.
Note: SBU410 is shown to show several versions in general. Note: when device is started up, auto starts ON (Its status light becomes ON).
Automatic ventilation is controlled by the Set Point along with P16 and P18
parameters, according to table below.
At Heating Mode, the evaporator speed is always LOW.
Note: when you enable Auto mode, then
system controls evaporator fans automati-
cally. Pressing the Auto button again, then
it shuts off the evaporator fans automati-
cally.
- Standby: if the alternator warning lamp
signal (KL.61) is disabled (this indicates
that the vehicle or air-conditioner
alternator is operating correctly and the
battery voltage at the terminal plug can be
measured), then system will be in standby
mode. ON / OFF button status LED lights up
in red.
Press button (2) when the status light is
OFF. Auto mode will start and the
corresponding status light will become on.
2.2- Operation Instructions
• Enabling/Disabling Standby Mode
• Enabled
2.3- Auto Mode
Display after enabling
- Disable: press button (1).
The Compressor and fans are immediately
disabled (the same will occur if the KL.61
signal is enabled). If the KL.61 signal is
disabled, the device goes into Standby and
the ON / OFF button status light illuminates
red.
- Enable: press button (1).
The status led for the ON/OFF button goes
out. The return (back) temperature will
appear when starting the controller for the
first time. The AUTO mode and AC button are
enabled, so it is controlling the speed of the
evaporator fans automatically.
Before and after Auto Mode Enabling.
Temperature
decreasing
Set-point
Temperature
increasing
High Speed
Low Speed
Set-point + P16
(Set-point + P16) - P18
CONTROLLER
2
22.0
22.0
1
22.0
1
CC 646 MS - CC 676 MS
11

Note: temperature can be adjusted between 17°C and 28°C through 0.5°C gaps.
Note: heating mode controls every floor convector and SBU400 ones too.
Note: the air conditioner compressor must be turned OFF, at least 1 minute
before it can be turned ON again.
If the AC button is pressed during this time, the device reschedules the air
conditioner compressor start up for one 1 minute again (the AC button flashes).
The air conditioner compressor runs for at least 1 minute before shutting down.
If it is disabled directly after enabling, it will continue to operate for 1 minute
(the AC button flashes).
Note: after product start up and at
Cooling Mode, the condenser fans
run for 10 seconds, so just then the
air conditioner compressor is
enabled.
2.5- Heating Mode2.4- ON/OFF Air Conditioner Compressor
2.6- Desired temperature level SET POINT
Air conditioner compressor
disabled.
- OFF: press button (3) if the status light is
on. If the compressor is ON, the status light
will flash for 1 minute, indicating the
compressor status change from ON to OFF.
The cooling function is disabled then.
Press button (4) to Increase
temperature + 0.5 °C.
Press button (5) to Increase
temperature - 0.5 °C.
Compressor Mode/Auto Enabled.
- ON: press button (3). Air conditioning
compressor is enabled and turns ON if
necessary, and if minimum waiting time is
kept (see following note). The cooling
function is switched ON again.
Temperature UP.
Temperature DOWN.
Temperature
decreasing
Set-point
Temperature
increasing
Compressor
ON
Compressor
OFF
Set-point - P22
Set-point + P21
Temperature
decreasing
Set-point
Temperature
increasing
Heating
enabled
Heating
disabled
Set-point - P23
Set-point + P24
Heating Mode is controlled by set-point and parameters P23 and P24, according
to table below:
CONTROLLER
22.0
3
22.0 22.5
2 1.5
22.5
2 1.5
4
5
CC 646 MS - CC 676 MS
12

SP + P49 -
SetPoint
SP - P50 -
P51 P51 P51 P51P52 P52 P52 P52
Note: if the evaporator fan speed is
changed manually, the automatic fan
control mode will turn OFF. The desired
room temperature (set point) value is kept
the same.
Note: if the Auto button is pressed, the
auto mode turns ON again. Then fans will
turn on again automatically.
2.7- Evaporator fan speed configuration
2.8- Enabling / Disabling the ventilation function
Fan speed, from low to
high speed, and vice-versa.
Active ventilation
function.
Press button (6).
Auto Mode is disabled.
When the ventilation function is disabled (7), this allows external air to get into
the vehicle. Function enabling may be automatic and will depend on internal
temperature and parameters P49 and P50.
If the return temperature is out of range (between SP + P49 and SP - P50) shown
in the table below, ventilation will remain enabled (no external air inlet).
In this condition, if the function is manually enabled by the key, ventilation will
remain disabled for the time set in parameter P20.
If the internal temperature is within the range, ventilation will remain cycling
between active and inactive, during the time gaps saved in P52 and P51,
respectively, as shown in the table below.
If the status light above the ventilation
button does not light, the function is
disabled and the ventilation valve is open,
allowing air to get in.
Press button (6).
• Press it once: fan speed increases one
step higher (from low to high speed).
• Press it again: fan speed turns from high
speed to low speed.
Open ventilation valve.
Temperature
Time
Enable recirculation
Disable recirculation
CONTROLLER
22.0
22.0
6
22.0
22.0 22.0
22.0
7
CC 646 MS - CC 676 MS
13

2.9- Faults (errors)
Display failure.
Note: if there is a fault, the display goes between Set point and the error codes. The desired
temperature will be displayed for 5 seconds and the error series (s) occurring will be
displayed for 2 seconds each. If an error has been eliminated, it will no longer be displayed.
• Display Failure
Error Component Cause Solution
F00
Low or High
Pressure Switch
Refrigerant gas level is wrong.
Press switch is faulty.
Expansion valve is faulty.
Condenser is blocked or faulty.
Change the press switch and/
or compressor.
Check the condenser fans.
Check the refrigerant gas level.
Look for any leaks.
Change the expansion valve.
F01 Feed source
(relay board)
Feed input is out of limit:
12V: <10V >16V
24V: <20V >32V
Check the wiring harness.
Change the relay board.
F02 Feed source
(control panel)
Feed input is out of limit:
12V: <10V >16V
24V: <20V >32V
Check the wiring harness.
Change the relay board.
F03 System type No recognition, no link. Change the controller.
F04
Return (back)
temperature
sensor
Ground short circuit trouble
between pins.
Check the wiring harness.
Change the sensor.
F05
Return (back)
temperature
sensor
Ground short circuit trouble
between pins.
Check the wiring harness.
Change the sensor.
F06 Duct temperature
sensor (SBU410) Power (+) short circuit or
trouble between sensor.
Check the wiring harness.
Change the sensor.
Error Components Cause Solution
F07
Duct temperature
sensor (SBU410)
Ground short circuit trouble
between pins.
Check the wiring harness.
Change the sensor.
F08 EEPROM No access from EEPROM. Change the controller.
F09
Motor water
measuring valve
(SBU410)
It can not be adjusted at the
right pressure. Check the wiring harness.
Change the motor.
F10
Compressor clutch
coupling
F00 has appeared for 3 times
or more. See F00.
CONTROLLER
F00
F00
F15 Signal D+ Absence of alternator D+ signal
(CL61)
Check the wiring harness.
Check alternator.
CC 646 MS - CC 676 MS
14

2.10- SCB2000 Controller Operation
SCB2000 Controller
2.11- Description of the Control Panel
1
2
7
8
3
4 5 6
This product aims to control the temperature of SD (Single Deck) vehicles. The
intelligence of the system and charge activation is done by Smart ECU in
conjunction with the relay board, while the panel is used for user interface only.
Below is a description of each of the keys with their respective functions.
1- ON/OFF Turns the product ON / OFF.
2- AC Indicates that the compressor is ready for
operation.
3- Increment of the set-point Defines the desired temperature in the room.
4- Decrease of the set-point Defines the desired temperature in the room.
5- Auto Activates the automatic fan speed and air
renewal mode.
6- VENT Manual speed control of the evaporator fans.
7- Re-Heat Turns on / off the passenger window defroster.
8- Air recirculation Turns on / off air recirculation on the bus.
AIR CONDITIONING OPERATION CC 646 MS - CC 676 MS
15

3- Technical Features
EQUIPMENT DESCRIPTION CC 646 MS - CC 676 MS
218.500 BTU/h (64kW) 230.000 BTU/h (67kW)
13.200 m
³
/h 13.200 m
³
/h
17.400 m
³
/h 17.400 m
³
/h
Condenser/Evaporator 152 Kg 152 Kg
Evaporator 91,5 Kg 91,5 Kg
R134a - 8,3 Kg R134a - 8,3 Kg
Bock FK40 / 755 cm
³
Bock FK50 / 775 cm
³
31 Kg 42 Kg
Condenser/Evaporator 3100 x 1698 x 225 3100 x 1698 x 225
Evaporator 1996 x 1698 x 225 1996 x 1698 x 225
(1) Weight of rooftop unit without integrated heating system.
(2) Gas load values vary according to application.
(3) Compressor weight without clutch.
CC676 MSHighlights
Maximum Capacity
Evaporator Air Flow
CC646 MS
AIR CONDITIONING
DIMENSIONS
Component
COMPRESSOR
Condenser Air Flow
Unit Weight Ceiling
(1)
Refrigerant Gas
(2)
Compressor
Weight (3)
Dimension L x W x H
(mm)
Digital Electronic Control:
• Smart commands;
• Automated control (keeps the A/C at the programmed temperature);
• Fresh air flap manually or automatically controlled;
• Alarms for fault diagnosis.
Relay Board:
• High reliability;
• Easy maintenance.
Compressor:
• High performance;
• Long durability.
Blower/Fan:
• Low noise;
• High performance;
• Long durability.
16

6
7
1
EQUIPMENT DESCRIPTION
3.1- Condenser Components
12
2
5
489
3
10
11
CC 646 MS - CC 676 MS
13
ITEM DESCRIPTION QTY.
1 Condenser Central Closing 1
2 Extruded Aluminum C Profile 1
3 Extruded Aluminum C Profile 1
4 Condenser Coil 1
5 Axial 24V 12" Electronic Condenser Fan 6
6 Discharge Pipe Set 1
7 Front Finish Cover 1
8 Condenser Liquid Line Set 1
9 Liquid Tank / Drier Filter 1
10 Tank Liquid Line Set 1
11 Finishing Rubber 2
12 Condenser / Evaporator Base w/ Renewall 1
13 Condenser Electric Wiring Harness 1
17

7
EQUIPMENT DESCRIPTION
3.1- Evaporators Components
12
12
1
2
2
2
3
Front Evaporator
Rear Evaporator
8
9
3
10
11
11
6
CC 646 MS - CC 676 MS
5
7
4
1
7
10
ÍTEM DESCRIPTION QTY.
1 Central Evaporator Closing 1
2 Front Finish Cover 1
Air Renewal Set With Filter 1
Air Renewal Filter Set 1
4 24V Air Renewal Eletric Engine 1
5 Evaporator Wire Harness 1
6 Electric Control Board 24V 1
7 TGEN 3,5 TR Expansion Valve 2
8 Right Evaporator Coil 1
9 Left Evaporator Coil 1
10 Evaporator Liquid Line Tube Set 1
11 Suction Tube Set 1
12 24V Radial Fan 6
3
18

EQUIPMENT DESCRIPTION
3.2- BOCK FKX 40/755K - FKX 50/775K Compressor Components
1
3
8
4 7
6
9
2
10
11
5
CC 646 MS - CC 676 MS
ÍTEM DESCRIPTION QTY.
1 BOCK FKX40/755K or BOCK FKX50/775KCompressor 1
2 Pulley 2A/2B 1
3 Compressor Valve Board Set 2
4 Compressor Oil Pump 1
5 Compressor Sealing Kit 1
6 FKX40 or FKX50 Piston Assembly 4
7 Compressor Roll Bearing 2
8 Compressor Oil 2
9 Compressor Clutch Assembly 1
10 Ball Roller Bearing 1
11 Magneto 1
19

EQUIPMENT DESCRIPTION
3.4- Electric Components
6
3
9
8
5
4
7
2
10
1
CC 646 MS - CC 676 MS
ÍTEM DESCRIPTION QTY.
1 SBU-400 Refrigeration Air Conditioning Controller 1
2 SBU-410 Air Conditioning Controller w/ Heating w/ Renewall 1
3 Electric Control Board 24V 1
4 Relay -
5 High or Low Pressure Switch 1
6 External Temperature Sensor 1
7 NTC Anti Freeze Thermostat 1
8 125A Fuse 1
9 Fuse Holder 1
10 2CP45-4 Temperature Sensor 1
20