39
AUTOMATIC CO
2
CYLINDER CHANGEOVER
Gas auto changer (MCO-80GC) is available as an optional accessory. This system switches the gas
supply line when one CO
2
gas cylinder is empty.
Note:
The installation of MCO-80GC should be implemented by a qualified service personnel.
After attachment of MCO-80GC, do the following:
1.
Connect a CO
2
gas pipe to port A and B respectively. A connecting port for CO
2
gas pipe is located
on the upper back of the unit. (See page 8).
2.
Connect a CO
2
gas cylinder provided with a gas regulator to each gas pipe. See page 15, for the
connection of the gas cylinder.
3.
Open the valve of each gas cylinder.
4.
Check that the CO
2
gas supply line indicator on the control panel is lit by pressing the CO
2
gas supply
line switching key.
5.
Select a CO
2
gas supply line (A or B).
6.
When one cylinder is empty, the indicator blinks, buzzer sounds, and “E01” and current chamber
temperature are displayed alternately on the digital temperature indicator while the gas supply line is
switched to other one. To silence the buzzer, press the alarm buzzer stop key (BUZZER).
7.
Replace the empty CO
2
gas cylinder.
Note:
Exercise caution when handling empty CO
2
gas cylinders as some gas can be still be left in the
cylinder.
This system MCO-80GC detects that no more CO
2
gas exists in a cylinder when the CO
2
density in the
chamber is not increased for a while after opening of CO
2
gas valve in the unit and switches the gas
supply line. The switching of supply line can be caused by some other reasons; blocking or restricting of
gas tube, reduction of CO
2
gas pressure, or improper opening of CO
2
gas cylinder, in spite of gas quantity
in the cylinder. Therefore, always check the gas quantity in the cylinder prior to disconnection.
