Economiser And Additional Cooling; Use Of Flammable Refrigerants Of The A2L Safety Group (E.g. R1234Yf) - Bitzer CSH6553-35Y Operating Instructions Manual

WARNING
Risk of bursting due to counterfeit refrigerants!
Serious injuries are possible!
Purchase refrigerants only from reputable man-
ufacturers and reliable distributors!
Risk of air penetration during operation in the
vacuum range
NOTICE
!
!
Potential chemical reactions as well as in-
creased condensing pressure and rise in dis-
charge gas temperature.
Avoid air penetration!
WARNING
A critical shift of the refrigerant ignition limit is
possible.
Avoid air penetration!

3.1 Economiser and additional cooling

Compressors of the series CSH65 to CSH95 are
provided with an ECO economiser connection that is
active in the entire capacity control range. They also
have connections for external oil cooling and LI liquid
injection.
The economiser of the compressor models CSW65 to
CSW105 and CSH76 to CSH96 is only active at full
load. These compressors have no connections for addi-
tional cooling.
For production reasons, the CSK61 and CSK71 com-
pressors are equipped with connections for ECO and
LI, which are not approved for use.
These connections will no longer be available in the
near future.
3.2 Use of flammable refrigerants of the A2L
safety group (e.g. R1234yf)
Information
The information in this chapter about the use of
refrigerants of the A2L safety group refer to
European regulations and directives. In regions
outside the EU, observe the local regulations.
Information
For refrigerants of the A3 safety group, e.g.
R290 propane or R1270 propylene, specific
compressor designs can be delivered upon re-
quest. In this case, also observe the additional
Operating Instructions.
SB-170-10
This chapter describes and gives explanations of addi-
tional residual risks originating from the compressor
when using refrigerants of the A2L safety group. This
information helps the manufacturer of the system carry
out a risk assessment. This information may in no way
replace the risk assessment for the system.
Design, maintenance and operation of refrigeration sys-
tems using refrigerants of the A2L safety group are
subject to particular safety regulations.
When installed in accordance with these operating in-
structions and under normal operating conditions
without malfunction, the compressors are free from ig-
nition sources that could ignite the flammable refriger-
ants of the A2L safety group. They are considered
technically tight. The compressors are not designed for
operation in an Ex zone. The compressors have not
been tested for use with flammable refrigerants in ap-
plications according to the UL standard or in units ac-
cording to EN/IEC60335 standards.
Information
When using a flammable refrigerant:
Affix the warning sign "Warning: flammable ma-
terials" (W021 according to ISO7010) well vis-
ibly to the compressor. An adhesive label show-
ing this warning sign is enclosed with the Oper-
ating Instructions.
The combustion of refrigerant in the compressor's ter-
minal box can only happen when several very rare er-
rors occur simultaneously. The probability of this event
occurring is extremely low. Combustion of fluorine-
based refrigerants can release lethal amounts of toxic
gases.
DANGER
Life-threatening exhaust gases and residues of
combustion!
Sufficiently ventilate the machinery room for at
least 2 hours.
Never inhale combustion products.
Use appropriate, acid-resistant gloves.
In case of suspected burnt refrigerant in the terminal
box of the compressor:
Do not enter the place of installation and ventilate it for
at least 2 hours. Do not enter the place of installation
until the combustion gases have completely escaped.
Never inhale combustion products. The potentially toxic
and corrosive exhaust air must be released into the at-
mosphere. It is necessary to use suitable, acid-resistant
gloves. Do not touch moist residues, but allow them to
dry, because they may contain dissolved toxic sub-
stances. Have trained staff clean the parts concerned
or, if the parts are corroded, dispose of them properly.
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