1.
2.
3.
NOTE:
During compressor shut down, a short reverse rotation sound is generated. The duration of this sound depends on
the pressure dierence at shut down and should be less than 3 seconds. This phenomenon has no impact on
compressor reliability.
Gas pulsation
The compressor has been designed and tested to ensure that gas pulsation is optimized for the most commonly
encountered air conditioning pressure ratio. Manifolded compressors are equivalents to lagged sources of gas
pulsation. Therefore, pulse level can vary during time.
Mitigations methods: If an unacceptable level is identied, a discharge muer with the appropriate resonant
volume and mass can be installed.
Mitigation Methods
To ensure minimum vibrations transmission to the structure, strictly follow Danfoss mounting requirements
(mounting feet, rails etc..). For further information on mounting requirements, please refer to section Design
compressor mounting.
Ensure that there is no direct contact (without insulation) between vibrating components and structure.
To avoid resonance phenomenon, pipings and frame must have natural frequencies as far as possible from
running frequencies(50 or 60 Hz). Solutions to change natural frequencies are to work on structure stiness and
mass (brackets, metal sheet thickness or shape…)
Manage Operating envelope
The Operating envelope for DSH scroll compressors guarantees reliable operations of the compressor for steady-
state operation.
Steady-state operation envelope is valid for a suction superheat within 5K to 30K range at nominal Voltage.
High and low pressure protection
Low-pressure (LP) and high-pressure (HP) safety switches must never be bypassed nor delayed and must stop all
the compressors.
LP switch auto restart must be limited to 5 times within 12 hours.
HP safety switch must be reset manually.
Depending on application operating envelope, you must dene HP and LP limits within operating envelope and
pressure setting table above.
Discharge temperature protection
DSH240 to DSH600 include an integrated discharge temperature protection. Excessive discharge temperature will
result in tripping of electronic module ouput relay.
This protection, eective for suction superheat above 5K (9°), should be considered as a compressor safety device
and its purpose is not to ensure operation map control.
In case of basic map control by pressure switches that can not ensure totally that the compressor will remain in its
operating envelope, an additionnal external discharge protection is required. (see below Figure 51: Discharge
temperature protection examples)
Scroll compressors, DSH090 to DSH600 | Application
© Danfoss | Climate Solutions | 2022.10 AB288965961751en-001402 | 46
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