Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 57
21.0 Defrost Sequence
EKE 1A 1B 1C
Applicable
Defrost Sequence
Defrost Sequence is not initiated by the EKE, but must be initiated by the master controller. In a
standalone conguration, the defrost mode is not possible It is however possible to enter a special.
To initiate defrost, the system mode is changed from Heat pump to A/C, hereby the outdoor unit will
act as a condenser and the hot discharge gas from the compressor will defrost the coil. In some
system electrical heaters are used instead of reversible system, but defrost sequence can still be used.
Parameter Function Default Value
D101 Defrost start low pressure limit 1bar g
D102 Defrost start time 1sec
D100 Defrost OD 0 %
D104 Defrost end closed time 0 sec
D103 Defrost end OD time 0 sec
D105 Defrost end OD 50 %
Note:
If a DI is setup to control
defrost, it’s not possible to
control defrost via Modbus.
Defrost sequence start/stop signals can be one of the following options.
1. Modbus register (nonvolatile memory) – default OFF at power-up
2. DI’s for use as defrost start/stop. Only one DI can be assigned for defrost start/stop. Start is dened
as a transition from o to on, a transition from on to o is a stop signal.
During defrost mode, User can dene the valve closing OD% by using valve preset OD (I078)
OD %
time
0
Defrost end
closed time
Defrost end
OD time
Defrost
end OD
Defrost OD
Injection
Defrost
Defrost end
Startup
Defrost end
signal received
Defrost start
signal received
Defrost start time
Danfoss
80G360.10