Parameters Description - Resource Data Management Mercury PR0018 User Manual

Mercury Switch User Guide

Parameters Description

Number Parameter
P-01 Refrigerant
P-02 Span
P-03 Offset
P-04 Glide
P-05 Pressure Type
P-11 Evap 1 offset
P-12 Evap 2 offset
P-13 Evap 3 offset
P-14 Evap 4 offset
P-15 Evap 5 offset
P-16 Evap 6 offset
P-17 Evap 7 offset
P-18 Evap 8 offset
P-19 Evap 9 offset
P-20 Evap 10 offset
P-31 Transducer Fault Delay
P-32 Alarm Delay
P-33 HP Alarm
P-40 MOP
P-41 MOP Diff
P-42 MOP Delay
P-43 Recovery Count
P-50 Humidity Low
P-51 Humidity High
P-52 Trim Low
P-53 Trim High
P-54 Trim Off Level
P-55 Trim Mode
P-56 Broadcast ID
P-57 Evaporator Type
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
Description
Select the gas type used within the refrigeration system.
Total range of transducer. See:
Value below zero*
Allows the calculated temperature to be offset by subtracting the value at P-04
Select between Absolute or Gauge pressure
Pressure difference between suction transducer and evaporator 1
Pressure difference between suction transducer and evaporator 2
Pressure difference between suction transducer and evaporator 3
Pressure difference between suction transducer and evaporator 4
Pressure difference between suction transducer and evaporator 5
Pressure difference between suction transducer and evaporator 6
Pressure difference between suction transducer and evaporator 7
Pressure difference between suction transducer and evaporator 8
Pressure difference between suction transducer and evaporator 9
Pressure difference between suction transducer and evaporator 10
Alarm generated, once transducer fault delay expires, if the transducer fails.
Delay before the HP alarm is generated.
If the pressure exceeds this value then a High Pressure alarm is generated once the alarm
delay expires.
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)
When the pressure reduces below this value valves on controllers connected to the Switch will
recover to their normal operational
Delay after the MOP value has been exceeded before the MOP actions and alarm occurs.
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.
Sets humidity low level.
Sets humidity high level.
Sets trim low level.
Sets trim high 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.
 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
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.
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
Revision 2.1D
To Disable Local Transducer
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