Menu Preventions - Hitecsa Advance EQS Serie Manual Del Usuario

Selection of the customised EEV Ratio value to be used upon start-up of
1
the circuit in defrosting
EEV Ratio value to be used upon start-up of the circuit in defrosting
2
In window Jg09 it is possible to set the threshold that causes a defrosting cycle to
start even if the start up count has not been performed. The minimum interval
between one defrosting cycle and the next is still valid. Note that the bypass times
are slightly shorter than those set for the low pressure alarm, so as to require
forced defrosting before any alarm.
Very low pressure threshold below which immediate defrosting is required
1
Bypass of circuit start-up request
2
Bypass of request during operation
3
III.1.8

Menu Preventions

In the Prevention menu it is possible to edit the parameters relating to functions
limiting the power supplied on circuits in order to prevent alarm situations.
The action of prevention is different depending on the type of compressor present:
in units with scroll compressors, prevention reduces the maximum number of
compressors that can be operated on the circuit by 1; in units with screw
compressors the maximum power supplied is limited; in units with inverter
compressors or linear screw or Turbocor the power is gradually limited.
High pressure prevention
High pressure threshold above which the circuit power is reduced
1
Differential with respect to the threshold below which prevention is
2
cancelled
Delay on exceeding the threshold, after which the circuit power is reduced
3
Maximum number of forced compressors switch-offs with minimum residual
4
on time in a 60-minute time window.
During action of function FNR2, the high pressure prevention settings of window
Jh02b are used
USM_CONTROL EQS_2335a21275_208549_210701_ES-EN-FR-DE-IT
1
2
1
2
3
1
2
3
4
(only with FNR)
92
Low pressure prevention
If enabled, the low pressure prevention behaves similarly to the high pressure
one, reducing the circuit power when low pressure drops below the set threshold.
Note: it is generally disabled, replaced in the functions by the low pressure / LOP
prevention action of the thermostatic valve.
Low pressure prevention/LOP
If enabled, the low pressure / LOP prevention action of the thermostatic valve
consists in modifying the value of the integral time applied to the regulation of the
thermostatic valve. The prevention action is carried out under a threshold
calculated by summing up an offset at the low pressure alarm threshold. On the
screens it is possible to set a different offset depending on the machine's
operating mode.
Anti-freeze prevention
If enabled, the anti-freeze prevention behaves similarly to the high pressure one,
reducing the power of all circuits when primary outlet temperature drops below the
set threshold. Note: it is generally disabled, replaced in functions by the action of
temperature control.
Low pressure ratio prevention
If enabled, the low pressure ratio prevention behaves similarly to the high
pressure one, reducing the power of all circuits when the ratio between the high
pressure value and low pressure drops below the set threshold.
High pressure prevention eco
If enabled, the economizer high pressure prevention disables the economizer
when the condensation or evaporation pressure exceeds the respective
thresholds.
Low overheating prevention
If enabled, the low superheating prevention action (LowSH) is extended for the
amount of time set on the screen, even once the low superheating conditions
have lapsed.
CONTROL EQS