Emerson Copeland OME-4MTL-12X Application Manuallines page 57

Name on
Code Description
Visograph
Minimum pressure
(temperature)
LAC1 LAC1 alarm for
compressors in
Circuit 1
Minimum pressure
(temperature)
LAF1 LAF1
alarm for fans
section in Circuit 1
Maximum
pressure
(temperature)
HAC1 HAC1
alarm for
compressors in
Circuit 1
Maximum
pressure
HAF1 HAF1 (temperature)
alarm for fans
section in Circuit 1
52
Alarms Circuit 1
Cause
▪ If AC1 = REL:
Suction pressure or
temperature ≤ SETC1 - AL3
▪ If AC1 = ABS:
Suction pressure or
temperature ≤ AL3
▪ If AC2 = REL:
Gas cooler pressure or
temperature ≤ SETF1 - AL24
for time AL26
▪ If AC2 = ABS: Gas cooler
pressure or temperature ≤
AL24 for time AL26
▪ If AC1 = REL:
Suction pressure or
temperature ≥ SETC1 + AL4
▪ If AC1 = ABS:
Suction pressure or
temperature ≥ AL4
▪ If AC2 = REL:
Gas cooler pressure or
temperature ≥ SETF1 + AL25
for AL26 delay
▪ If AC2 = ABS:
Suction pressure or
temperature ≥ AL25 for AL26
delay
Action Reset
Automatically as soon as the pressure
or temperature reaches:
▪ If AC1 = REL:
Only signalling
▪ If AC1 = ABS:
Automatically as soon as the pressure
or temperature reaches:
▪ If AC2 = REL:
Only signalling
▪ If AC2 = ABS:
Automatically when the pressure or
temperature ≤
▪ If AC1 = REL:
Only signalling
▪ If AC1 = ABS:
Automatically when the pressure or
If AL27 = yes
temperature ≤
▪ Compressors in Circuit 1
switch off with a delay from ▪ If AC2 = REL:
2 different steps AL28.
▪ All fans in Circuit 1 are
turned on. Inverter fan / ▪ If AC2 = ABS:
linear inverter for fan at
maximum speed.
SETC1 - AL3 + differential value
(differential = 0.3 bar or 1 °C)
AL3 + differential value
(differential = 0.3 bar or 1 °C)
SETF1 - AL24 + differential value
(differential = 0.3 bar or 1 °C)
AL24 + differential value
(differential = 0.3 bar or 1 °C)
SETC1 + AL4 - differential value
(differential = 0.3 bar or 1 °C)
AL4 - differential value
(differential = 0.3 bar or 1 °C)
SETF1 + AL25 – differential value
(differential = 0.3 bar or 1 °C)
AL25 - differential value
(differential = 0.3 bar or 1 °C)
AGL_Unit_OME_4MTL_EN_Rev01