User guide
Revision 7.1b Page 16 of 31
Mercury Coldroom Panel Installation Guide
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Warning
Please Note
The specifications of the product detailed on this
Set-Up Guide may change without notice. RDM
Ltd. shall not be liable for errors or for incidental
or consequential damages, directly and indirectly,
in connection with the furnishing, performance or
misuse of this product or document.
Ensure that all power is
switched off before
installing or maintaining
this product
When either P93 is reached or an OT alarm is present
P-93
Fans Off Temperature
Temperature for the above (P92) operation. Use the defrost probe.
P-83
Fan Control
This feature allows for coldroom fans to be stopped when the coldroom is down to
temperature thus saving energy. This feature is present in both the M and E software.
Run – fans operate as per the normal control strategy.
Pulse – When the LLV closes the fans will stop when the Fan Pulse On
parameter (P-78) time expires. The fans then remain off for the Fan Pulse Off
time (P-79). When the parameter Fan Pulse Off time expires the fans come back
on for the Fan Pulse on time. The cycle then repeats. The fans resume normal
operation if the LLV operates. The fans pulse on/off to ensure the circulation of
air within the coldroom.
Off – When the LLV closes the fans stay on for the Fan Pulse On (P-78) time
before going off until the LLV next operates.
Placement of the temperature control probes is important when using this feature
P-78
Fan Pulse On
The duration of the fans are pulsed on in Fan Control.
P-79
Fan Pulse Off
The duration of the fans are pulsed off in Fan Control.
P-77
Control Fail Valve
This value is used in the event of a control probe fail; In the EEV control algorithm the valve
will remain at this opening until the probe fault has been cleared. Please note the incorrect
setting of this value may result in flood back causing damage to the pack compressors. Do
not adjust this parameter if you are unsure of the consequences. In M software this is the
value to which the LLV/compressor relay will be pulsed open/closed. For example if set to
2 minutes then the LLV will be open for 2 minutes and then closed for two minutes. This
process will continue until the control probe fail has been rectified.
P-98
Control Fail On/Off
Set to ‘0’ to disable. If the valve control temperature fails, setting the value in minutes will
turn on and off the valve for the stated time period. The valve will cycle on/off until control
has been returned.
P-29
Probe 1 Operation
Plant - when a fixed resistor is switched in across the appropriate input a plant fault alarm
is generated.
External Defrost - when a fixed resistor is switched in across the appropriate input then it
places the controller into defrost. See also P-40 for setup. If the defrost signal is continually
present after completing the initial defrost then the controller will resume refrigeration. If the
defrost signal remains active then the controller will initiate a defrost and generate a
missed defrost alarm when the no defrost time parameter expires. Subsequent defrosts will
follow the no defrost time until the defrost input is removed.
P-18
Service Time
Time (in 1000 x hours) before the service icon (Spanner icon) comes on. The Run Hours
timer increments based on the number of hours the controller has been powered up and
running. Reset the spanner icon to off by changing this parameter to 0 and then back to the
desired service interval. This process also resets the Run Hours value to 0. To view the
current Run Time value refer to the I/O list.
P-95
Trap Stops LLV/Fans
When man trap input is activated the LLV closes and Fans are stopped. Normal operation
resumes when the mantrap input is deactivated.
P-99
Load Shedding
Off – Feature is not used
Mode 1 – Case goes to “CO2 Load Shedding Case Off Mode”
Mode 2 – Goes to Case Clean Mode
See: Load Shedding
P-35
Display Pin
Feature used for restricting access to settings menu via controller display. ‘0’ disables the
feature. A pin can be set between 1 and 999. The pin must be entered to access the
menus. On non-networked units, if the pin is lost, RDM technical can be contacted to assist
retrieval.
P-20
Alarm Delay
Delay for the over and under-temperature alarms
P-21
UT Alarm
Under temperature alarm set point. This alarm uses the control temperature)
P-22
OT Alarm
Over temperature alarm set point. This alarm uses the air-off temperature
P-23
Log Probe Type
0 = Off. (Logging with no alarms)
1 = Logging (Probe Fault alarm only)
2 = Logging/Alarm (Prb Flt and OT/UT)
P-24
Slug Log Probe
Applies a damping factor. This can be used to make a standard probe have the same
temperature response as a Product probe.
P-25
Log Alarm Delay
Delay for the Logging probe over and under-temperature alarms
P-26
Log UT Alarm
Logging probe under temperature alarm set point
P-27
Log OT Alarm
Logging probe over temperature alarm set point
P-28
Buzzer Mode
Allows the user to turn the local alarm buzzer off. Note. Man-trap alarms will sound the
buzzer irrespective of this parameter setting
P-40
Defrost Mode
Allows the user to set the defrost mode: -
Local (Uses the internal parameters P-41 and P-42)
Remote (Requires a defrost schedule in the front end)
External (Requires an external signal on the appropriate input)
If set to Local or Remote the external defrost input will be ignored.