Rivacold CO2NNEXT - Page 58

CO
2
NNEXT
rev.01
EN
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POSSIBLE CAUSE
SOLUTI
F
Compressor works continuously or for long periods
x System not sufficiently sized according to the
load.
x
Replace the system with a more powerful one.
x Excessive load to cool or insufficient insulation
x Reduce the load and improve insulation, if
possible.
x Evaporator covered with ice.
x Defrost.
x Limited thermal exchange on clogged gas-
x Check function of the gas-cooler
G
High pressure in main circuit supply
x Gas-cooler malfunction
x Clean and check the gas-cooler and the
relative fans
x Check the temperature probes for the STH2
and STA gas cooler output
x HPV high pressure valve not working properly.
x Check valve check alarms and reset.
x Check the correct
operation of the HPV valve.
x Check the minimum set-point.
x Clean entire mechanism and filter if provided
for the HPV valve.
x Replace the HPV valve.
H
High pressure liquid receiver
x VFL gas flash valve not working
properly.
x Check valve check alarms and reset.
x Check the correct
operation of the VFL valve.
x Clean the entire mechanism and filter if
required of the VFL valve.
x Replace the VFL valve.
x Parallel compressor (if present).
x Check set-point.
x Check correct compressor
operation, related alarms and reset
I
Frosted or wet drain pipes - low overheating
x Thermostatic valve functioning.
x
Possible liquid return to the compressor. Check
thermostatic valve
overheating and related parameters.
x Expansion valve blocked in opening.
x Clean the valve from foreign substances or
replace it if necessary.
x
Incorrect parameters for management of utilities
and/or related defrosts, utilities
management
and defrost management.
x Check the parameters and optimise them to
achieve overheating of at least 15K.