Danfoss Optyma iCO2 User Manual page 28

User Guide | Optyma™ iCO2
(2) Prevention of reverse phase operation
Compressor of this equipment runs in one direction only. If it is run in reverse direction, the compressor may fail to operate properly.
To prevent the reverse phase operation, the unit is equipped with the reverse phase prevention relay which checks whether the phase of power supply
is positive or reverse and, if it is in the reverse phase, displays the error code "E32", inhibiting the compressor start.
In such occasion, check that the primary (power supply side) phase and secondary phase are the same phase.
Secondary
L1 L2 L3 N
Primary side
Source power
L1 L2 L3 N
Note:
Turn power off before replacing the connection for prevention of electric shock.
(3)Prevention of short cycle operation
Short cycle operations (frequent repetitions of start and stop) could cause a short supply of
lubrication oil as a result of excessive oil rise at the time of starting. In addition, if a large start current
flows repeatedly through the built-in motor, the motor may overheat, resulting in motor coil burnout.
To prevent the short cycle operation, it is necessary at the minimum to set such that the pattern as
shown at right will be achieved. Major causes of short cycle operation are as follows
• Unbalanced load and condensing unit capacity
• Clogged suction strainer
• Improper setting of the operating pressure value
In addition to the above, where a unit cooler is used, the temperature sensor of inside compartment
temperature regulator may be misplaced (the temperature sensor is blown directly by cold air from
the unit cooler). Adjust the inlet suction superheating degree of condensing unit at 5 – 40 deg.
(4) Standard operational data
The figures in the table below are reference values; with change in outside ambient temperatures and/or evaporation temperatures, the operating
conditions will be different from the table below.
Standard data - OP-UPAC015COP04E
Outside
temperature
(˚C)
Rated refrigeration
32
value
Rated freezing value 32
Outside
temperature
(˚C)
Refrigeration
42
overload
Freezing overload 42
Outside
temperature
(˚C)
Refrigeration low
3.2
outside temperature
Freezing low outside
-5.4
temperature
28 | BC408445719305en-000101
Evaporation Compressor
temperature Rotating rate
(˚C) (rps)
-10 103
-40 102
Evaporation Compressor
temperature Rotating rate
(˚C) (rps)
-10 102
-40 100
Evaporation Compressor
temperature Rotating rate
(˚C) (rps)
-10 102
-40 104
HP/MP/LP Td
(bar g) (˚C)
91.5/50.2/26.0 82.5
83.7/29.5/9.0 125
HP/MP/LP Td
(bar g) (˚C)
110/58.5/25.8 104.3
105/36.5/9.1 130.7
HP/MP/LP Td
(bar g) (˚C)
84.9/48.7/26.3 87.9
86.8/41.3/8.0 109
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
Operation Stop
3 min.
4 min.
or more
or more
7 min.
or more
EEVG EEVSC
(pulse) (pulse)
399 435
181 86
EEVG EEVSC
(pulse) (pulse)
399 395
180 80
EEVG EEVSC
(pulse) (pulse)
400 334
400 83
Time
EEVLB
(pulse)
0
313
EEVLB
(pulse)
0
311
EEVLB
(pulse)
0
0