Danfoss VRJ, Инструкции по применению

Страница: 11 / 24

Application Guidelines
11
AB141686422149en-US0401
Operating conditions
Refrigerant and lubricants
Motor supply
Compressor ambient
temperature
General information
High ambient temperature
PVE
Low ambient temperature
Residual moisture
When choosing a refrigerant, different aspects
must be taken into consideration:
•
Legislation (now and in the future)
• Safety
• Application envelope in relation to expected
running conditions
• Compressor capacity and efficiency
• Compressor manufacturer
recommendations & guidelines
Additional points could influence the final choice:
•
Environmental considerations
• Standardisation of refrigerants and
lubricants
• Refrigerant cost
• Refrigerant availability
In case of enclosed fitting and high ambient
temperature, it is recommend to check the temperature of power wires and conformity to
their insulation specification.
Polyvinyl ether (PVE) is an innovative refrigeration
lubricant for HFC refrigerant systems. PVE is as
hygroscopic as existing polyolester lubricants
(POE), but PVE does not chemically react with
water; no acids are formed and compressor
evacuation is easier. The compressor technology applied in Danfoss
VRJ scroll compressors in combination with PVE
lubricant provides the best possible result in
terms of reliability and compressor lifetime.
Although the compressor itself can withstand
low ambient temperature, the system may
require specific design features to ensure safe and reliable operation. See below sections for
recommendations.
Prior to shipment from the factory, every
compressor is dehydrated, evacuated, and
charged with dry nitrogen. Maximum residual moisture levels are 0.0082 oz. for model VRJ028,
and 0.0120 oz. for VRJ035 and VRJ044.
VRJ scroll compressors can be operated only
connected to the dedicated variable speed
drive, at nominal voltages as indicated in “supply voltage” section. Under-voltage and over-voltage
operation is allowed within the indicated voltage
range.
VRJ scroll compressors can be applied from
-13°F to 125°F ambient temperature. The
compressors are designed as 100 % suction gas cooled without need for additional fan cooling.
Ambient temperature has very little effect on the
compressor performance
VRJ scroll compressor application range is
influenced by several parameters which need to
be monitored for a safe and reliable operation.
These parameters and the main
recommendations for good practice and safety
devices are explained hereunder:
Refrigerant and lubricants
Motor supply
Compressor ambient temperature
Application envelope
(evaporating
temperature, condensing temperature, return gas
temperature)