Troubleshooting - Sanyo MCO-18AIC Service Manual

TROUBLESHOOTING

If the unit malfunctions, check out the following before calling for service.
The unit does not operate at all
• The unit is not plugged correctly into a power outlet.
• The circuit breaker at the power source is active or a power failure has occurred.
The key operation is disabled
• The key lock function is set in ON mode.
If the alarm function operates
[At the beginning of operation]
• The chamber temperature is not equal to the set value.
• The chamber CO density is not equal to the set value.
2
a. The secondary pressure of the pressure regulator is not equal to the set value (0.03MPaG,
2
0.3kgf/cm G, 4.3psiG).
b. The tube is not connected securely between the pressure regulator and the unit.
[During operation]
• The upper limit alarm temperature is not set at least 1
• The set temperature value was changed, or the door was left open for a long period. Or a low
temperature load was placed inside the unit. In this case, if the unit is left as it is, the alarm will
eventually clear itself.
• The gas tube has slipped off or the gas leaks.
• The set value of the gas density was changed.
• The gas cylinder is empty. Check the primary pressure of the CO
primary pressure of less than 3.8MPaG (38kgf/cm
cylinder soon.
If the chamber temperature is not equal to the set temperature
• The ambient temperature must always be at least 5
• The outer door was closed while the inner door was left open.
If the gas density does not coincide with the set value
• The secondary pressure is not set to 0.03MPaG (0.3kgf/cm
• The gas tube is clogged or chinked.
If the chamber humidity does not rise
• The humidifying pan is not filled with sterile distilled water. (Always use sterile distilled water.)
If the CO consumption is too much
2
• The door is opened frequently.
• There is any gas leakage at the connection or pin hole on the tube. It is recommended to replace the
tube once a year.
• The gasket of the inner door is not completely sealed.
• The access port at the upper left corner is opened.
If normal cultivation cannot be done and chamber gas density is suspect
• The environment around the unit is not normal. The source of the contaminated gas is nearby.
• The unit is installed in an enclosed space.
If it takes much time to recover the gas density
• HEPA filter is provided in the gas piping. If it takes much time to recover the gas density even though
the gas pressure is normal, it may be that dust on the HEPA filter prevents the gas flow. Consult the
Sanyo dealer or agent.
o
C higher than the set chamber temperature.
cylinder once a week. (The
2
2
G) means a little gas in the cylinder.
o
C less than the set temperature.
2
G, 4.3psiG).
77
Replace the
31