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Mercury Coldroom Panel Installation Guide

www.resourcedm.com

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.

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