Parameter Descriptions - Resource Data Management PR0712-EPR Installation & User Manual

Mercury 2 & Intuitive Mercury EPR Stepper Installation Guide
22 = R502. 23 = R503. 24 = R507. 25 = R717. 26 = R290 (Propane). 27 = R744. 28 = R407F. 29 = R410A

Parameter Descriptions

Number Parameter
P-01 Cut-in Temp
P-02 Diff
P-03 Control Weight
P-04 Display Weight
P-09 Response on
P-10 Response off
P-51 EEV Minimum Opening
P-56 EEV Start Opening
P-55 Average Valve Opening Normally the valve during recovery will open to the last average position. This setting allows for that value
P-57 EEV Divide value
P-12 Relay 3 Mode
P-85 Key-switch Mode
P-87 Control Probe type
P-90 Resistor Case Off
P-92 Fans temperature
mode
P-93 Fans Off Temperature
P-83 Fan Control
P-78 Fan Pulse On
P-79 Fan Pulse Off
P-15 Probe 5 Select
P-16 Relay 3 mode
P-17 Evap. Select
P-97 Control Fail Valve
Value
P-29 Probe 1 Resistor
Function
P-18 Service Interval Time
(Run Hours)
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
Please Note
Description
The target Temperature at which the valve will start opening.
Differential temperature below the cut-in temperature where the valve will stay in a steady state value.
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
As above only applied to the display temperature
Allows the user to speed up the valve opening speed, with 30 providing the quickest response and 1
providing the slowest response.
Allows the user to speed up the valve closing speed, with 30 providing the quickest response and 1
providing the slowest response.
Sets the minimum valve opening level, during normal operation the valve will not go below this level.
Sets the valve opening % which is used after a defrost or when the controller is first powered on.
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%.
This parameter is not used in this controller and has no effect.
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.
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.
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
Turns on/off the switched resistor case off function
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
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.
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
The duration of the fans are pulsed on in Fan Control.
The duration of the fans are pulsed off in Fan Control.
This input can be used as a defrost termination probe (default) or as a monitor probe with an OT alarm
level (P-28)
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.
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.
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.
Selects whether the switched resistor invokes either a Plant fault or an External Defrost.
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
Revision 1.2a Page 12 of 25
www.resourcedm.com