Euroclima ZHK, Manual

Page: 106 / 142

Instruction Manual ZHK
V07-21.0 105/140
8.2 Refrigeration circuit
8.2.1
General notes
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Refrigeration equipment is subject to the EG Pressure Equipment Directive 2014/68/EU and
requires special handling and special care.
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Start the refrigeration circuit only if it was properly installed, evacuated and filled. Never start a
compressor under vacuum.
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It is essential that the flow of refrigerant blends as R407C is carefully considered when adjust-
ing superheat controls.
-
Air inlet and thus the entry of humidity into the refrigeration circuit must be avoided rigorously,
since the refrigerant oil is highly hygroscopic. The water, which is absorbed by the oil, cannot be
removed sufficiently.
8.2.2 Manually starting the compressor via EUROCLIMA control system
The compressor can be started via the display of the EUROCLIMA control system as follows:
1. Start page
→ All Settings → Password handling → Enter the password
Note:
Manually starting the compressor can only be performed at service level (Password level
4; key symbol: 2 keys). The 4-digit password for the service level is 6975.
2. Start page → All Settings → Inputs/Outputs → Digital outputs → Compressor 1 ( / Compressor
2 / Compressor 3) → Manual intervention → On
8.2.3 Refrigerant
Refrigerants used by EUROCLIMA are halogenated hydrocarbons, preferably R407C and R134a.
These are also known as safety refrigerants (safety group A1 according to EN378 part 1) in con-
trast to flammable refrigerants such as Propane or toxic refrigerants such as Ammonia.
They are actually non-flammable under normal operating conditions and do not create explosive
mixtures with air, but are odorless. Only higher concentrations in the air can be noted by the olfac-
tory sense.
DANGER!
Refrigerant vapors, which escape from leaking cylinders or refrigeration plants, will
mix undetected with air and therefore creates a significant risk of suffocation due
to a severe lack of essential oxygen. Humans are not able to detect oxygen defi-
ciency with their senses. As refrigerant vapor is heavier than air, it concentrates at
ground level and in lower-lying areas of the building. In order to avoid the occur-
rence of higher concentrations, workplaces must always be ventilated well.
WARNING!
Halogenated refrigerants can also have narcotic effect. In the event of high refrig-
erant concentration (e.g. tube leakage) in the technical room, the room must be
evacuated immediately. Enter only after adequate room ventilation occurs and it is
deemed safe to do so.
If the room must be entered during high refrigerant concentrations, then a breathing apparatus that
is independent from the ambient air must be used. Furthermore, such a breathing apparatus can
only be used by specially trained personnel, medics or other relevant professionals.