9.2.1 Firmware variants
Currently there are four variants of firmware used:
l
GDC Firmware - optimised for coolers with doors fitted (Glass Door Coolers). Use the aux input for a door
switch.
l
OFC Firmware - optimised for Open Front Coolers. Use the aux input for the evaporator fan sensor.
l
SZ Firmware- optimised for sub zero coolers. Use the aux input for the evaporator sensor, an additional input
is available for the door switch.
l
CO2 Firmware - optimised for CO2 (R744) ready coolers with the addition of CO2 parameters.
9.2.2 ems25 series and GDCfirmware defrost parameter exceptions
ems25 series controllers and ems55 series controllers with GDC firmware do not have the dtF
(Defrost Termination Method) parameter. This means it is not possible to select a defrost on demand
function.Defrost cycles will end either at the end of a defrost interval, or when the defrost termination
temperature (dtd) is reached.
9.2.3 New or revised parameters
New parameters have been added to the GDCfirmware:
l
Sensor enable (Sn)
l
Marketing mode (Ar)
Note:
l The above applies to ems55advanced controllers manufactured after July 2012
Revisions have been made to the Ar parameter for selected controllers during 2014. The following
controllers have the enhanced functionality:
l ems25Plus
l ems25Plus CO2
l ems25
+
CO2 CQC
Please refer to controller user manual for further details.
In order to determine which parameters are used, refer to the XML file. The XMLfile lists parameters
by cooler manufacturer, model and region, as well as the controller model.
9.3 Temperature setting rules
For correct operation, the parameters that define the temperatures must not create conflicting con-
ditions.
For example, as the EMS controller aims to keep the ready mode temperature between the set point
(SP) temperature and the set point (SP) plus differential (dIF) temperature, the freeze-up protection
(dtt) temperature must be lower than the set point (SP) temperature.
Otherwise, the EMS controller would activate freeze-up protection under normal operating con-
ditions.
Rules for the temperature settings:
66 of 86
27 February 2014
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