Revision 1.2a
Page 12 of 25
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
Mercury 2 & Intuitive Mercury EPR Stepper Installation
Guide
www.resourcedm.com
22 = R502. 23 = R503. 24 = R507. 25 = R717. 26 = R290 (Propane). 27 = R744. 28 = R407F. 29 = R410A
Parameter Descriptions
Number
Parameter
Description
P-01
Cut-in Temp
The target Temperature at which the valve will start opening.
P-02
Diff
Differential temperature below the cut-in temperature where the valve will stay in a steady state value.
P-03
Control Weight
Percentage of the Air-On temperature that is used to calculate the control temp. The remaining
percentage will be used on the Air-Off temperature
Example, P-03 set to 30%
Control temp = 30% Air-on + 70% Air-off
P-04
Display Weight
As above only applied to the display temperature
P-09
Response on
Allows the user to speed up the valve opening speed, with 30 providing the quickest response and 1
providing the slowest response.
P-10
Response off
Allows the user to speed up the valve closing speed, with 30 providing the quickest response and 1
providing the slowest response.
P-51
EEV Minimum Opening Sets the minimum valve opening level, during normal operation the valve will not go below this level.
P-56
EEV Start Opening
Sets the valve opening % which is used after a defrost or when the controller is first powered on.
P-55
Average Valve Opening Normally the valve during recovery will open to the last average position. This setting allows for that value
to be reduced by said percentage. For example if the average valve opening is calculated as 80% and P-
55 is set to 50% then the valve will open at 40%.
P-57
EEV Divide value
This parameter is not used in this controller and has no effect.
P-12
Relay 3 Mode
Relay 3 can be set to control a Suction line valve or defrost valve (LLV)
Suction
– set for Suction Line Valve operation.
Defrost Valve
– Used to closed the LLV during defrost.
P-85
Key-switch Mode
Allows the keys switch to be: -
Single turn for case off (Case off mode)
Single turn for Fans only (Fans Mode)
Single turn for case off, double turn for fans only (Toggle mode)
Key off disables the keyswitch.
P-87
Control Probe type
Switches between using the air-on probe and the Logging probe. Note the control and display
temperature will still be a derivative of the weighted
Average of the control probe + Air-off probe
P-90
Resistor Case Off
Turns on/off the switched resistor case off function
P-92
Fans temperature
mode
Allows the user to set the fans to turn off when: -
A pre-determined temperature is reached (P93)
When an over-temperature alarm is present
When either P93 is reached or an OT alarm is present
P-93
Fans Off Temperature
Temperature for the above (P92) operation.
Note
the defrost termination probe is the source of the
temperature reading used in this feature. If the defrost termination probe isn’t fitted then a similar process
to P-44 is used.
P-83
Fan Control
This feature allows for coldroom fans to be stopped when the coldroom is down to temperature thus
saving energy.
Run
– fans operate as per the normal control strategy.
Pulse
– When the valve 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 valve operates. The fans pulse on/off to
ensure the circulation of air within the coldroom.
Off
– When the valve 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-15
Probe 5 Select
This input can be used as a defrost termination probe (default) or as a monitor probe with an OT alarm
level (P-28)
P-16
Relay 3 mode
This changes the function of relay 3 from Lights (default) to an alarm relay. The alarm relay is energised
for no alarm. Use the NC and Common for “Loop make” on alarm or use the NO and Common for “Loop
break” on alarm.
P-17
Evap. Select
This allows the controller to use a pressure transducer input which is then converted to temperature and
used in place of the evaporator in temperature to calculate the superheat value. In the event of no remote
value being received, the controller will revert to using the evaporator in probe value until the remote value
is restored. The calculated superheat is for information purposes only and does not have any control
functionality.
P-97
Control Fail Valve
Value
This value is used in the event of a control probe fail; In the EPR control algorithm the valve will remain at
this opening until the probe fault has been cleared.
P-29
Probe 1 Resistor
Function
Selects whether the switched resistor invokes either a Plant fault or an External Defrost.
P-18
Service Interval Time
(Run Hours)
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
