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Description of the start-up stages:
1 EC-30C is turned off.
2 EC-30C is turned on. The pre-cooling unit PCU is cooling down to the target
temperature +2 °C (+35.6 °F). Deep-cooling unit DCU 1 (green line) and
deep-cooling unit DCU2 (purple line) are cooled passively by the pre-cooling
unit. The temperatures of DCU 1 and DCU 2 are decreasing.
3 Pre-cooling unit PCU reaches the target temperature of +2 °C (+35.6 °F). The
DCU with the lower temperature (here DCU 1) is cooling down until it reaches
its target temperature of -30 °C (~-22 °F). Second deep-cooling unit (here: DCU
2) is still passively cooled.
4 DCU 1 reaches the target temperature of -30 °C (~-22 °F). DCU 2 heats and
starts defrosting to reach the target temperature of +20 °C (68 °F).
5 DCU 2 reaches target temperature of +20 °C (68 °F). DCU 2 keeps the target
temperature of +20 °C (68 °F) constant for 20 minutes in order to assure a
successful defrost process. DCU 1 keeps a constant target temperature of -30 °C
(~-22 °F).
6 DCU 2 will be turned off. DCU 1 still at target temperature -30 °C (~-22 °F).
Only after a restart of the unit this stage takes a shorter periode of time. This
way the unit can switch very quickly to the dewed DCU and avoid a freeze up.
During operations the length of this stage follows the requirements of the 6
hours‘ cycle time. Because in any case the cooling DCU has to keep the re-
quired target temperature constant for three hours. (see stage 11).
7 DCU 2 cools down to target temperature -30 °C (~-22 °F). DCU 1 keeps
constant the target temperature of -30 °C (~-22 °F).
8 DCU 2 reaches the target temperature of -30 °C (~-22 °F). EC-30C switches the
gas flow to DCU 2. DCU 1 switches off for 20 minutes.
9 DCU 1 heats to the target temperature of +20 °C (68 °F). DCU 2 stays at target
temperature of -30 °C (~-22 °F).
10 DCU 1 reaches target temperature of +20 °C (68 °F). DCU 1 keeps the target
temperature of +20 °C (68 °F) constant for 20 minutes in order to assure a
succesful defrost process. DCU 2 stays at target temperature of -30 °C (~-22 °F).
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