Binder UF V - Page 82

UF V (E3) 03/2019 Page 82/116
WARNING
High concentration of CO
2
(> 4 vol.-%).
Risk of death by suffocation.
Danger of poisoning.
 Operate the CO
2
emergency cooling only in a well-ventilated room.
 Ensure technical ventilation measures. Install a suitable conduct at the CO
2
discharge
outlet of the emergency cooling system.
 Observe the relevant regulations for handling CO
2
.
We recommend connecting an exhaust hose to the CO
2
discharge outlet (14) and to conduct it to the out-
side or to an exhaust system. Since the CO
2
emergency cooling system is also effective in case of a pow-
er failure, an uninterruptible power supply is recommended for the exhaust system.
The RD4 controller measures and controls the temperature value inside the useable volume. Depending
on the increase or decrease of temperature, the controller controls the CO
2
emergency cooling in stand-
ard operation and during power failure. As soon as the preselected emergency cooling temperature is
reached inside the useable volume, the solenoid valve of the emergency cooling system opens, and liquid
CO
2
from the pressurized CO
2
cylinder is injected at intervals into the useable volume. The liquid CO
2
expands until ambient pressure and evaporated into the useable volume. This results in cooling-down the
useable volume to the pre-set emergency cooling temperature.
When opening the outer door, CO
2
injection is interrupted. This prevents potential cold burns / frostbite by
inflowing CO
2
gas at manipulation inside the freezer.
After turning on the freezer, the CO
2
emergency cooling is deactivated for 60 minutes.
When operating the CO
2
emergency cooling, the temperature distribution may deviate from the technical
data valid at -80 °C (chap. 27.4).
Activating the CO
2
emergency cooling
• Open the valve of the CO
2
gas cylinder
• Set the emergency cooling temperature at the controller (chap. 21.3.1)
• Activate the CO
2
emergency cooling at the controller (chap. 21.3.2)
• If desired, perform a. test run (chap. 21.3.3).
DOMINIQUE DUTSCHER SAS