6
AGL_Ref_ST_ZO_E_Rev00
NOTE: Use only lubricants that are qualified for the product. The use of non-approved
lubricants can damage the product and will result in loss of warranty!
The recommended quality for carbon dioxide purity class is 4.0 [(≥ 99.99 %) H
2
O ≤ 10 ppm,
O
2
≤ 10 ppm, N
2
≤ 50 ppm] or higher.
The characterization of R744 (CO
2
) according to EN 378-1 is safety class A1, not flammable,
ODP = 0 and GWP = 1. High concentrations of CO
2
are dangerous. This refrigerant is odourless and
colourless. Therefore the use of CO
2
detectors is required.
CO
2
is heavier than air. As a result, local concentrations (especially at floor level or in deeper slots,
ie, CO
2
pockets) can be higher than average values in the machine room. The ventilation system
must take this into account.
2.6.2 Application limits
CAUTION
Inadequate lubrication! Compressor breakdown!
The superheat at the
compressor suction inlet must always be sufficient to ensure that no refrigerant
droplets enter the compressor. For a typical evaporator-expansion valve
configuration a minimum stable superheat of at least 20 K is required.
ZOV*AG compressors operating envelopes depend on the running speed. The envelope limitations
are mainly related to lubrication and drive power limitation. ZO*AG compressors are fixed speed and
therefore the application limits do not depend on the running speed.
For application envelopes and technical data, please refer to Copeland Select software available at
Figure 4: Envelope of the ZO*AG compressors
Figure 5: Envelope of the ZOV*AG compressors
NOTE: For matched pairs with smaller drives, please check the application envelopes in
Copeland Select software at
