Carel IR32M Manual page 24

d9: Defrost priority over compressor protection
This parameter cancels the compressor protection times (c1: minimum time between two successive start-
ups, c2: minimum shut-down time and c3: minimum operating time) at the start of defrosting.
0= protection times are observed;
1= protection times are not observed; defrosting has greater priority and takes no account of the compressor
timings.
As an example, it is useful for avoiding delay in hot gas defrosting when the compressor has only just shut
off and has been restarted with a minimum time between two insertions. It must be remembered however
that in this event the maximum number of compressor start-ups per hour may not be observed.
Default: d9=0 (defrosting is subject to the compressor's timings - it should be remembered that in the default
state these are set at zero). For equipment with serial number less than 5,000 d9=1 in default state.
Available on IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.
d/: Reading defrost sensor
By choosing this parameter it is possible to display the value being read by the defrost sensor, in equipment
where that is fitted. When the parameter d/ has been selected, pressing will not allow the value to be
changed, but the value registered by the defrost sensor can be read.
Available on IR32Y, IR32P, IR32C and IRDRC.
Parameter with direct access from remote control.
dC: Time bases
Consent to alter the units of measurement used in counting times for parameters dI (interval between
defrosting) and dP (duration of defrosting).
0 = dI is expressed in hours and dP in minutes;
1 = dI is expressed in minutes and dP in seconds.
The parameter dC=1 can be useful for speedily testing the operation of defrosting with reduced times.
It is however considered that if defrosting requires insertion of the compressor (hot gas defrosting)
and the parameter d9=1 there can be a risk of damaging the compressor by too many start-ups at
short intervals.
On the other hand, the parameter dC=1 can be very useful when it is wished to use the IR32Y version for
controlling air dehumidifiers. The defrosting cycle then becomes the condensate discharge cycle, which
needs to be initiated at short intervals (minutes) and for very brief periods (seconds). Contact your Carel
agent for further information.
Default: dC=0, that is, the defrost interval dI is expressed in hours, and dP, the maximum duration of
defrosting, in minutes.
Available on IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.
23 Cod. +030220151 - Rel. 2.1 - 04/09/98