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6. Maintenance
6.1. Introduction
A comprehensive maintenance program will help to ensure that the unit
continues to operate reliably. Such a maintenance program will also help
to control operating costs, increase the unit's working life, and improve
performance.
IMPORTANT TO READ AND FOLLOW
Regular maintenance includes a quick overview of the unit
from a Safety perspective. Service Technician must pay par-
ticular attention, but not exclusively to: nuts and bolts tight-
ening (replacing if missing), electrical wires, harnesses, fuel
lines routing (repairing or replacing if needed), doors, skins
grills, panels conditions (repairing or replacing if needed).
Confirmation of such operations can be detailed on request.
All maintenance services must be done by a technician trained
on Carrier products respecting all safety and quality standards of
Carrier.
6.2. Maintenance Schedule
Hours
Displayed
Real
10
100
100
1000
200
2000
300
3000
400
4000
500
5000
600
6000
700
7000
7. Product Loading
This unit is not designed to carry special loads which emit
corrosive gas.
These kinds of products can impact unit performance, and
seriously reduce component lifetime.
Please contact us if such products need to be carried.
• Proper air circulation in the compartment, air that can move
around and through the load, is a critical element in maintaining
product quality during transport. If air cannot circulate completely
around the load, hot spots or top freeze can occur.
• The use of pallets is highly recommended. When pallets are
loaded so air can flow freely through them to return to the
evaporator, the product is protected from heat passing through
the floor of the trailer. When using pallets, it is important to
refrain from stacking extra boxes on the floor at the rear of the
compartment as this will cut off the airflow.
• Product stacking is another important factor in protecting the
product. Products that generate heat, such as fruits and
vegetables, should be stacked so the air can flow through the
product to remove the heat. This is called "air stacking" the
product. Products that do not create heat, such as meats and
frozen products, should be stacked tightly in the center of the
compartment.
• All products should be kept away from the sidewalls of the
body, allowing air to flow between the body and the load. This
prevents heat filtering through the walls from affecting the
product.
• It is important to check the temperature of the product being
loaded to ensure that it is at the correct temperature for
transport.
Service Type
Initial
Service A
Service B
service
X
X
X
X
X
X
X
X
The refrigeration unit is designed to maintain the temperature of
the product at the temperature at which it was loaded; it is not
designed to cool a warm product.
7.1. Before Loading
• Pre-cool the compartment by lowering the temperature for
about 15 minutes.
• Evacuate the humidity existing inside the compartment
by carrying out a manual defrost. This can only take place
when enabled by the defrost thermostat (box temperature
lower than 37.4°F during pull down and 46.4°F during heating).
• Evaporator fans are protected by safety grilles. In the event of
heavy duty use of the unit, ice can accumulate on the grilles. It
is therefore recommended to clean them regularly by means of a
small brush. The operation MUST be done when the unit has
been SHUTDOWN.
7.2. During Loading
• Stop the unit (place START/RUN/OFF switch in the OFF
position.
• Check product temperature during loading.
• Ensure that the air returns and supply openings remain
unobstructed
X
X
• Do not forget to close the doors.
X
• Before closing the doors, check your load once more and see
that nobody is shut inside the compartment.
For stationary utilization, we recommend placing the
compartment in the shade.
Never leave your unit more than a month without running.
Open the cooling compartment doors in case of extended stop.
7
• Leave approximately 4 to 5 inches between
load and compartment front wall for air
return to the unit.
• Leave at least 10 to 12 inches between the
top of the load and the ceiling to ensure
there is nothing to prevent air flow.
• Load product on pallets to provide free air
return to unit and improvement product
protection.
62-12263
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