Operating States Of The Units - Carel IRMPX00000 User Manual

12. Operating states of the units

As indicated above, the display LEDs can be in three states:
• off, when the function indicated or the actuator is not operative;
•
on, when the function indicated or the actuator is operative;
• flashing, when the function is held up by an alarm situation, by a delay, or by a particular status of the Multifunction input.
There are however various specific operating states not directly indicated by the displays. This can lead to erroneous interpretation of
the unit's operating state. For convenience, the status of the display in such situations is shown below:
SPECIFIC STATE
Between defrosts
Awaiting defrost
Defrost requested
Defrost in progress
Dripping
Post-dripping
Serious alarm
(1) Only if the defrost requested is inhibited by digital contact and if the request for defrost comes from the digital input; the defrost
is performed as soon as the enabling digital contact is closed.
♦
signifies that the LED may be on, off or flashing depending on the other parameters and ambient factors (temperature,
operating set, differential etc.). The general remarks made above on the status of the LEDs should be kept in mind.
12.1 Sequence of the main phases
For easy reference, below is a diagram showing the sequence of all the possible phases in the defrost process. It should be
remembered that some phases (e.g. dripping or post-dripping) can be activated or inhibited by an appropriate choice of parameters.
The type of activators being controlled and the type of control depend on the type and configuration of the units selected.
PHASE normal
operation
ACTIVITY unit's
temperature
controlled
Cod. +030220191 rel. 2.0 dated
COMP LED
defrost
evaporator the defrost
defrosted as relay is off,
required while the
controller
awaits the
other units to
end defrost
The sequence progresses from left to right.
25/06/01
FAN LED
♦ ♦
♦ ♦
♦ ♦
♦ ♦
off off
♦
flashing
♦ ♦
await dripping
dripping
compressor and
evaporator fans
are off in order
to help drainage
of water after
defrost
41
DEF LED C. CYCLE
off
off
flashing (1)
on
off
♦
♦
post dripping resumption
normal op.
fans are off to temperature
allow the control
evaporator to resumed
reach operating
temperature
LED
♦
♦
♦
♦
♦
♦
♦