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YLCC-H YLCC
d1 (USER) Activation defrost (0 = no; 1 = yes) 1 1
d2 (USER) Defrost by time/temp. (0 = time; 1 = temp.) 1 1
d3 (USER) Temperature start defrost °C -1 -1
d4 (USER) Temperature end defrost °C 5 5
d5 (USER) Minimum time for defrost start sec. 60 60
d6 (USER) Minimum duration defrost sec. 0 0
d7 (USER) Maximum duration defrost min. 10 10
d8 (USER) Time between two defrost cycles min. 30 30
d9 (USER) Delay between defrost of both circuits min. 10 10
db (USER) Backup heater during defrost (0 = no; 1 = yes) 0 0
dc (USER) For compressor before defrost (between 1 and 3) (a) min. 0 0
dd (USER) For compressor after defrost (between 1 and 3) (b) min. 0 0
Parameter H5 Pump operating mode
0 Pump absent
(1) In permanent operation
2 In operation under call from the controller
(demand for cool or heat)
Factory value
UnitParameter Description
Defrost cycle
Timer reset
Start defrost End defrost
Temperature end
defrost (d4)
Temperature start
defrost (d3)
Minimum time
start defrost (d5) Duration defrost
(a) When defrost conditions are reached, and before starting
the cycle, the compressor turns off during the dc interval
(can be set to between 1 and 3 minutes). Once the com-
pressor is off, the 4-way valve inverts its position during
the dc/2 interval to allow pressure balancing. During this
process, the controller does not consider compressor pro-
grammed timings and, therefore, the compressor goes on
and off intermediately.
If dc = 0, this procedure is deactivated.
(b) When the defrost cycle is over, the compressor turns off
during the dd interval (can be set to between 1 and 3
minutes). Once the compressor is off, the 4-way valve
inverts its position during the dd/2 interval to allow pres-
sure balancing and elimination of drops of water in the
outdoor exchanger. During this process, the controller does
not consider compressor programmed timings and, there-
fore, the compressor goes on and off intermediately.
If dd = 0, this procedure is deactivated.
Pump operation
Three operating modes of the water pump can be selected in
accordance with the value give to the H5 parameter.