R = Parameters For The Temperature Regulation - Carel IR32M Manual

r = parameters for the temperature regulation

REGULATION PARAMETERS
rd Regulation delta (differential)
r1 Set minimum allowed
r2 Set maximum allowed
r3 Direct/reverse operation (Dir r3=0, rev r3=1;IR32S only)
Note: for the set times to become operative, the instrument must be switched off and on again.
rd: Regulation delta
Sets the value of the differential, or hysteresis, used in regulating the temperature. A narrow differential, i.e.
one with a low number, ensures a temperature which differs little from the setpoint (or optimal operating
temperature), but which requires frequent switching on and off of the main operating components (normally
the compressor). It is possible to prolong the life of the compressor by appropriately setting the parameters
to define the number of start-ups per hour and the minimum switch-off period (see the Compressor
parameters).
In all Infrared refrigeration equipment the differential is placed to the right of the setpoint as indicated below
(DIRECT operation):
Default: rd=2. Available on IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC. Parameter with direct
access from remote commander.
r1: SET minimum allowed
This parameter sets the minimum value that can be given to the setpoint. Using this parameter prevents the
user from fixing a setpoint lower than the value
IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.
r2: SET maximum allowed
This parameter sets the maximum value accepted as a setpoint. Use of this parameter prevents the user
from fixing a setpoint greater than the value assigned to r2. Default: +90. Available on IR32S, IRDRSE/S0,
IR32Y, IR32P, IR32C and IRDRC.
r3: DIRECT/REVERSE
Model IR32S is also designed to operate as a thermostat (parameter H1=0, see below). In "thermostat"
operation it is possible to select the function "cooling" (or DIRECT, as typically used in refrigeration) or the
function "heating" (or REVERSE, as used typically in heating). It should be remembered that in the
REVERSE mode the differential is to the left of the setpoint as indicated in the diagram below. Model IR32S
has a further parameter in the "r" category for selecting the mode of operation, parameter r3.
When r3=0 you have the DIRECT operation (refrigeration). When r3=1 you have the REVERSE operation
(heating). See also the description of parameter A4. Default: r3=0 (DIRECT) with H1=0 on model IR32S,
IRDRSE/S0. This parameter is not available on other models. Available on IR32S, IRDRSE/S0.
For the r3, r4, r5, rt, rH, rL parameters:
description of this parameter functionalities, effective for the instrument with serial number greater than 100,000)
assigned to r1.
see the following chapter "Notes for the new release" to a more detailed
18
Type Min. Max.
F 0.1 +19.9
C -40 r2
C r1 +199
C 0 1
Default: -40. Available on IR32S,
Cod. +030220151 - Rel. 2.1 - 04/09/98
U.m. Def.
°C/°F 2
°C/°F -40
°C/°F 90
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