CSR-20 & CSR-40, September 1999
Structural/Accessory Maintenance
Humidity System
7-7
Humidity System (Option)
The Humidify Mode increases the humidity level in the con-
tainer by injecting atomized water directly into the evaporator
supply air stream. The use of the Humidify Mode should be
established by the shipper. The Humidify Mode option is
turned on from the Program menu of the controller. See
“Humidify Mode” on page 4-39 to set the Humidify system to
ON.
If the Humidify Mode is set to ON, the controller display
will show “HUM” in the left display and the container humidi-
ty level (e.g. “74.5”) in the right display for 1 second every 10
seconds. When the humidify function is operating (air com-
pressor energized), the supply air LED will flash ON and OFF.
The controller energizes (operates) the air compressor
when the humidity level in the container is more than 2%
below the humidity setpoint. The air compressor atomizes and
injects water into the evaporator supply air stream to add mois-
ture to the container air.
The evaporator drain hoses are routed to the water tank
to replenish the water level during unit operation. However,
water usage will vary depending upon the load and ambient
conditions. An overflow hose on the water tank removes
excess water when particularly wet loads are transported or
when the humidify system is not operating.
NOTE: Only demineralized or distilled water should
be used to prevent plugging of the atomizing nozzle.
Pretrip Inspection
The following items should be inspected before loading the
container:
•
Check the water level in the water tank to maintain an
adequate water supply.
•
Check humidify system operation by starting the unit, set-
ting the Humidify mode to ON and adjusting the humidify
setpoint (HUMSP) more than 2% above the current
humidity level in the container. Verify that the air com-
pressor operates and that water is drawn into the atomiz-
ing nozzle and injected into the return air stream.
Inspection and Cleaning
The following items should be periodically serviced:
•
Clean and inspect the filter in the water supply hose on the
water tank every 1,000 operating hours. Clean the filter
screen with fresh water and a soft brush.
•
Inspect the water tank, water supply line and atomizing
nozzle every 1,000 hours and clean if necessary. Use
fresh water, a soft brush and compressed air to clean and
blow clear components.
•
Inspect the air compressor for signs of overheating once a
year.
Humidify System (Option)
1. Water Supply Hose and Atomizing Nozzle: Inspect
every 1,000 hours and clean if necessary.
2. Filter: Inspect every 1,000 hours and clean if neces-
sary.
3. Air Compressor: Inspect once a year.
4. Water Tank:
• Pretrip Inspection: Check the water level.
• Every 1,000 Hours: Inspect the water tank and
clean if necessary.
5. Water Tank Heater: Check for correct operation in
ambient temperatures below 4 C (40 F).
6. Drain Cock
