RT-SVX063G-EN
79
If the discharge pressure limit is preventing loading, holding
or forcing unloading, an indication will be made to the user
interface.
Note:
Note: The discharge pressure limit function assumes
that all available condenser fans are running and
limiting compressor capacity is the only option left.
Compressor Discharge Saturated
Temperature Limit
Compressor Discharge Saturated Temperature Limit is a
control feature of Adaptive Control for variable speed
compressors only. This circuit-level feature applies when
the discharge saturated temperature approaches the
compressor operating threshold limit for high discharge
saturated temperature. Limit control action modifies the
normal capacity modulation to decrease capacity by
reducing compressor speed.
Compressor Discharge Saturated
Temperature Speed Limit
Compressor Discharge Saturated Temperature Speed
Limit is a control feature of Adaptive Control for Danfoss
VZH variable speed compressors only. This circuit-level
feature applies when the discharge saturated temperature
approaches the compressor operating threshold limit for
high discharge saturated temperature. Limit control action
modifies the allowable compressor speed range.
High Suction Saturated Temperature
Inhibit
High Suction Saturated Temperature Inhibit is a control
feature of Adaptive Control for variable speed
compressors. This circuit-level feature applies when the
suction saturated temperature exceeds the compressor
operating threshold limit for suction saturated temperature.
Inhibit control action de-energizes the variable speed
compressor when the suction saturated temperature
exceeds the operating threshold design limit.
When this function is Active, an indication will be made to
the operator.
Compressor Involute Pressure
Differential Protection
Compressor Involute Pressure Differential Protection is a
control feature of Adaptive Control for variable speed
compressors. Scroll compressors have a limitation on the
pressure difference between the opposite sides of the
involute tip near the center of the scroll (compression ratio).
High values of compressor involute pressure differential
may cause compressor fatigue. Its associated limit will
attempt to allow the unit to run safely at partial capacity
without tripping the circuit on a diagnostic. The compressor
must be restricted from running in this condition.
When this function is active, an indication will be made to
the user interface. Depending on severity, both instant and
delayed shutdowns are possible. Shutdowns may be
temporary or require a manual reset.
Loss of Charge Detection
This function detects excessive refrigerant leakage. Units
can operate in a low charge condition for an extended
period where the loss of charge is not enough to trigger the
normal loss of charge protection. If the charge continues to
fall slowly, a subsequent start could result in variable speed
compressor damage. Loss of Charge Detection works in
concert with Superheat High Limit Detection.
Superheat High Limit Detection
A unit may experience refrigerant leakage at any point in its
service life. Moderate refrigerant loss reduces capacity and
causes low suction saturated temperature but excessive
refrigerant loss may lead to compressor damage.
Excessive refrigerant loss is detected by a suction
superheat condition which exceeds a high limit threshold.
This function detects excessive refrigerant loss by
comparing suction superheat to a high limit threshold. The
detection method reduces the potential for nuisance trips
by providing a startup delay time that is a function of the
outdoor air temperature.
This approach helps to mitigate false detection trips
because low suction saturated temperature and high
superheat is normal following startup at low outdoor air
temperature conditions.
When this function is active, an indication will be made to
the user interface and the circuit will shutdown.
Variable Speed Compressor Modulating
Current Limit
This Adaptive Control action will first reduce variable speed
compressor RPM which, in turn, reduces discharge
pressure. This will reduce the variable speed compressor
motor current thus preventing an A49 Speed Limit VFD trip.
This function works in concert with Current Limit Staging
Command which can subtract, hold or allow adding
compressor capacity. When this function is active, an
indication will be made to the user interface.
Compressor Low Suction Saturated
Temperature Speed Limit
This is an Adaptive Control feature for variable speed
compressors. Low suction saturated temperature can
occur following startup at low outdoor air temperature
conditions. This circuit-level feature applies to variable
speed compressors and enforces a minimum and
maximum speed limit.
Coil Frost Protection
This is a circuit level protection and is active whenever one
or more compressors on a circuit are running. This feature
is always available with all compressor types.
Содержание IntelliPak with Symbio 800
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