Carel IR32M Manual page 28

A4=5: DOOR SWITCH
By setting A4 = 5 it is possible to control the switch at the store-room door. When the switch is opened the
compressor is switched off. If the IR32C or IR32P versions with S90OEM4PWR are being used, the control
automatically also cuts off the evaporator fan (often positioned above the door), and, if the parameter H1=0
referring to the room light automatically goes on via output AUX. When the door is closed (and also the
Multifunction contact), the equipment resumes the previous operation, delaying any temperature alarm by a
number of hours equivalent to the value of d8. On re-starting the compressor however, any protective time
constraints selected will be respected (see c parameters). Note: even if the fan is controlled by the fan
controller (see category F), the fans will be shut down.
The table below summarises the functions served by the digital input according to the values assigned to A4
and to the equipment version being used.
Parameter value
0 Input not active
1 Immediate external alarm
Contact open = alarm active
closed = inactive
2 External alarm with delay
Contact open = alarm active
closed = inactive
3 Sensor selection
Contact open = first sensor
closed = second
Direct/Reverse
Contact open = direct
closed = reverse
Ready to defrost
Contact open = defrost
possible
closed = impossible
4 Start of defrost
5 Door switch
Contact open = door open
closed = door closed
Default values
Note: (*) T refers to the IR32S version when used in thermostatic operation, i.e. with parameter H1=0.
(**) X refers to the IR32Y version with time defrost as well as temperature, i.e. with parameter H1=0.
A5: This parameter is not controlled on the versions being considered and must be lept at 0.
Default: A5=0 Refers to models IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.
Note: see the following chapter "Notes for the new release" to a more detailed description of this parameter
functionalities, effective for the instrument with serial number greater than 100,000)
A6: Cut-out of compressor by external alarm
The function of this parameter is similar to that of parameter c4 (duty setting). As well as acting on the
sensor alarm, it acts on the external alarm via the multi-function input (A4=1 or A4=2). When an external
alarm occurs (whether immediate or delayed), the compressor works for a period equivalent to the value
given to parameter A6 (in minutes), while remaining off for a fixed period of 15 minutes. When given two
particular values A6 serves the following functions: A6=0: the compressor always remains off; A6=100: the
compressor always remains on. The fans continue to be controlled by according to the selected parameters
(see category F). If the duty setting for the sensor alarm (parameter c4) is also active, controil uses
the value of c4.
Default: A6=0 (compressor cuts out if there is an external alarm). Available on IR32S, IRDRSE/S0, IR32Y,
IR32P, IR32C and IRDRC.
A7: Delay in registration of external alarm (multi-function input)
Sets the delay (in minutes) in registering the external alarm when A4=2.
Default: A7=0 Available on IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.
Function
27
M T (*) S X (**)
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3 0 0
Y C
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0 0 0
Cod. +030220151 - Rel. 2.1 - 04/09/98
P
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0