List Of The Working Parameters To Be Checked Before Starting The Unit - Carel IR32M Manual

Models IR32S, IRDRS, IRDRSE and IR32Y
Configuration of the 'type' of instrument
The INFRARED series comprises two models - IR32S and IR32Y - with different operating modes. Both
models feature the H1 parameter (see below) allowing you to select one of the two operating modes. IR32S,
IRDRS and IRDRSE can operate either as a simple thermostat (H1=0, default value) or as a thermostat and
defrost controller for static units operaring at normal temperatures (the defrost cycle starts when the
compressor stops, H1=1). For the second type of operating logic, it is necessary to configure the instrument
and give H1 the value '1' (H1=1, see below 'How to modify the working parameters').
IR32Y controls and regulates both temperature and defrost for static units working at low temperature
ranges. The defrost cycle can use the timed ('X' functioning mode) or temperature end (evaporator
temperature, 'Y' functioning mode). In the second case the instrument requires another sensor - called the
defrost end sensor - to be placed on the evaporator (when in the 'X' functioning mode, the input for the
'defrost end sensor' remains free). The 'H1' parameter allows you to select either the 'X' or 'Y' functioning
logic. When H1=0 (default value), the instrument works in the 'X' logic (end of defrost based on time). If you
want the end of defrost based on temperature, select the 'Y' logic, that is H1=1 (see below 'How to modify the
working parameters').
Defrost parameters
When using the Infrared unit to control defrost, check the following parameters before starting the unit:
Models IR32S, IRDRS and IRDRSE (with H1=1), IR32Y, IR32C, IRDRC and IR32P:
dI: Time-interval between defrost cycles:
intervals (hours) set through the 'dl' parameter. When the time-interval is 0 (dl=0), the defrosting cycle is
never carried out unless it is forced via keypad (manual defrost) or via the digital input (see A4 parameter).
Temperature alarms are inhibited during each defrost. Def.: 8 (hours)
dP: Maximum defrost time:
(minutes). In the models without evaporator fan (IR32S with H1=1 and IR32Y with H1=0) this parameter
indicates the actual duration of the defrost. Def.: 30 minutes
Models IR32Y, IR32C, IRDRC and IR32P
d0: Type of defrost:
in the models equipped with defrost relay (IR32Y, IR32C and IR32P) 'dO' determines the
type of defrost, that is: 0 = electrical defrosting, 1 = hot gas defrosting. Def.: d0=0, electrical defrosting
dt: Defrosting end SET-POINT:
IR32C, IRDRC and IR32P) 'dt' allows you to set the defrost end temperature. Remember, however, that the
maximum duration of the defrost cycle corresponds to the value (in minutes) given to the dP parameter.
When the temperature measured by the defrost end sensor is higher than the defrost end set point set by the
User, the defrost cycle will be omitted. Def.: 4 ºC
LIST OF THE WORKING PARAMETERS TO BE CHECKED
Code Parameter
PARAMETERS OF THE REGULATOR
rd Control differential
DEFROST PARAMETERS
d0 Type of defrost (0=electrical, 1=hot gas)
dI Time-intervals between def. cycles
dt Defrost end set-point
ALARM PARAMETERS
Ad Temperature alarm delay
OTHERS FUNCTIONS
H1 Model [IR32Y: 0=type X; 1=type Y]
[IR32S, IRDRSE/S0: 0=type T; 1=type S]
defrost cycles occur periodically, depending on the time-
the dP parameter determines the maximum duration of the defrosting cycle
in the models equipped with defrost end sensor (IR32Y with H1=1,
BEFORE STARTING THE UNIT
Type
F
C
F
F
F
C
9
Min Max M.u.
0.1 +19.9 °C/°F
0 1 flag
0 199 hours
-40 +199 °C/°F
0 +199 min
0 1 flag
Cod. +030220151 - Rel. 2.1 - 04/09/98
Def
2
0
8
4
120
0