Installation 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
Revision 2.7 Page 48 of 83
Mercury Plant Controller Installation Guide
P406/456
Day Reduction
Reduces the inverter output by this amount when the timer is
not in its night zone.
P407/457
Day Pressure Limit
Pressure set-point to disable the day reduction feature. Day
reduction is disabled above this level and enabled below it.
P408/458
Transducer fail Level
Sets the output level of the inverter if the transducer fails
P409/459
Control Type
Selects between Fixed, Floating or Drop Leg control for
Condenser control only.
Fixed uses the set-point parameter as its target (P-20/40)
with the corresponding pressure transducer.
Floating uses the temperature of a selected probe converted
to a pressure as the set-point along with the corresponding
pressure transducer.
Drop leg uses the temperature of probe mounted on the drop
leg to calculate control pressure and uses the set-point
parameter as its target (P-20/40).
P410/460
Float Select
Selects the probe that measures the “floating” temperature
(Note : This would be fitted to the Air On of the Condenser)
See Note Floating Head Pressure
P411/412
Sect 1 / 2 drop Select
Selects which probe is used to measure Drop Leg
temperature. See Note Drop Leg
P414/461
Pressure at 0
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P415/462
Pressure at 10
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P415/463
Pressure at 20
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P417/464
Pressure at 30
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P418/465
Pressure at 40
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P419/466
Pressure at 50
O
C
Used to program the temperature to pressure conversion for
floating pressure use.
P420/467
Low Limit
Stops the floating pressure target from going below this level
P421/468
High Limit
Stops the floating pressure target from going above this level
P422/469
Condenser offset
Used to set a condenser differential, which is added to the
incoming temperature to produce a “floating” set-point
P438/439
Sect 1 / 2 Split
Set to “On” to enable Condenser Split feature.
P430/431
Sect 1 / 2 Split Temp
If outside ambient air temperature falls to this value then the
condenser split relay will come on. Note the Condenser Float
temperature probe is used as the air temperature reference.
P432/433
Sect 1 / 2 Split Temp Diff
Diff above for the split temp feature (P-430/431). If outside
ambient air temperature rises above Sect 1/2 Split Temp
parameter plus Sect 1/2 Split Temp Diff parameter then the
Condenser split relay will go off
P434/435
Sect 1 / 2 Split Pressure
If the discharge pressure rises above this setting then the
condenser split relay will be forced off regardless of
temperature.
P436/437
Sect 1 / 2 Split Pressure Diff
Diff below parameter for Split Pressure feature (P-434/435).
If the pressure for Section1/2 falls below Sect 1/2 Split
Pressure setpoint plus Sect 1/2 Split Pressure Diff parameter
then the condenser split relay will return to normal operation
(status depends on P-430/431).
P440/441
Sect 1 / 2 Heat Reclaim
Enable for Heat Reclaim. See : Relay Outputs
0 = Off (Not Used)