33
To prevent this hazard:
- Ensure that storage and working areas are well ventilated.
- Do not discharge nitrogen into locations where it could build up to dangerous levels (sewers, basements, pits,
closed rooms).
In case of accident:
If asphyxiation occurs, the rescuer must use a self-contained breathing apparatus to access the
victim or must be able to quickly ventilate the room to a sufficient extent without entering it.
4)
CO
2
backup
General remarks
CO
2
pressure in the cylinders and hoses reaches 70 bar. It is therefore recommended to call on qualified
personnel for any servicing of this system.
Cylinders of liquid CO
2
must be used.
Connection
Principle: when internal freezer temperature above injection temperature, liquid CO
2
is injected into the
chamber. The CO
2
injection solenoid valve monitors the temperature, managing CO
2
injection.
Connect the hose to the solenoid valve located at the rear of the freezer, then to the distribution manifold
or the CO
2
cylinder, after checking that Teflon tape is applied to the thread.
Warning: if the ambient temperature is higher than +37°C, all of the CO
2
in the cylinder will be transformed
to a gas. The cylinder pressure may exceed 90 bars (temperature of +40°C).
CO
2
detector
When CO
2
or N
2
are injected, the oxygen content in the air gradually decreases. To avoid potential
asphyxiation of people in the room, CO
2
detector must be used and an audible alarm is sounded when
oxygen level too low. Froilabo can supply CO
2
detectors.
To order or install a CO
2
detector on an existing system, please contact our customer service department.
5)
N
2
backup
Principle: when internal freezer temperature rises above injection temperature, liquid Nitrogen is injected into the
chamber. The solenoid valve monitors the temperature, managing Liquid Nitrogen injection.
Connecting the N
2
option:
1. Connect the N
2
hose supplied with the freezer (1).
2. Check that all couplings are properly tightened.
3. Connect the liquid nitrogen supply.
Parts to be assembled:
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