Revision 2.1D
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Mercury Switch User Guide
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
Parameters Description
Number
Parameter
Description
P-01
Refrigerant
Select the gas type used within the refrigeration system.
P-02
Span
Total range of transducer. See:
To Disable Local Transducer
P-03
Offset
Value below zero*
P-04
Glide
Allows the calculated temperature to be offset by subtracting the value at P-04
P-05
Pressure Type
Select between Absolute or Gauge pressure
P-11
Evap 1 offset
Pressure difference between suction transducer and evaporator 1
P-12
Evap 2 offset
Pressure difference between suction transducer and evaporator 2
P-13
Evap 3 offset
Pressure difference between suction transducer and evaporator 3
P-14
Evap 4 offset
Pressure difference between suction transducer and evaporator 4
P-15
Evap 5 offset
Pressure difference between suction transducer and evaporator 5
P-16
Evap 6 offset
Pressure difference between suction transducer and evaporator 6
P-17
Evap 7 offset
Pressure difference between suction transducer and evaporator 7
P-18
Evap 8 offset
Pressure difference between suction transducer and evaporator 8
P-19
Evap 9 offset
Pressure difference between suction transducer and evaporator 9
P-20
Evap 10 offset
Pressure difference between suction transducer and evaporator 10
P-31
Transducer Fault Delay
Alarm generated, once transducer fault delay expires, if the transducer fails.
P-32
Alarm Delay
Delay before the HP alarm is generated.
P-33
HP Alarm
If the pressure exceeds this value then a High Pressure alarm is generated once the alarm
delay expires.
P-40
MOP
If the pressure exceeds this value the valves on controllers connected to the Mercury Switch
will closed or be reduced to a predetermined percentage. A MOP alarm is also created. (See
MOP
)
P-41
MOP Diff
When the pressure reduces below this value valves on controllers connected to the Switch will
recover to their normal operational
P-42
MOP Delay
Delay after the MOP value has been exceeded before the MOP actions and alarm occurs.
P-43
Recovery Count
When the Switch comes out of MOP, the valves will come on at 1 minute intervals and turn
“this” number of valves on per minute.
P-50
Humidity Low
Sets humidity low level.
P-51
Humidity High
Sets humidity high level.
P-52
Trim Low
Sets trim low level.
P-53
Trim High
Sets trim high level.
P-54
Trim Off Level
When the timer is in the off period the trims will be pulsed at this value. Note if the humidity
sensor fails the trim relays will be pulsed at this level.
P-55
Trim Mode
Off
– Pulses the controller trim relays at the Trim Off Level.
On
– trim control feature will continuously pulse the controller trim relays dependant
on the measured humidity.
Remote
– Uses Data Manager GP Timer channel to determine when to control. See
GP Timer Setup
P-56
Broadcast ID
ID of Plant Controller being used to broadcast Suction Pressure
The Broadcast ID is derived from the Rotary Switch positions set on the Plant controller which
is providing the remote suction pressure.
Note:
no two Plant controllers on a local area network can have the same rotary switches
positions set. This will have adverse affects on control.
P-57
Evaporator Type
Select one of the following to determine the source of the pressure value used to calculate the
remote evaporator temperature.
Local
– Uses Mercury Switch on board 4-20mA Input
Remote 1
– Uses the Remote Plant controllers Transducer Input 1
Remote 2
– Uses the Remote Plant controllers Transducer Input 2
Remote 3
– Uses the Remote Plant controllers Transducer Input 3
Note:
Mercury Switch pressure units must match that of the Plant Pack controller it is mapped
to e.g. both devices have to be set to Bar or PSI
See Note :
EEV Control
