User guide

Revision 7.1b Page 17 of 31
Mercury Coldroom Panel Installation Guide
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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
P-41
Defrost Start
When defrost mode is set to “Local”, this is the start time for the 1
st
defrost
P-42
Defrosts per Day
When defrost mode is set to “Local”, this is the number of defrosts per day equally spaced
from the start time.
P-43
No Defrost Time
If the controller misses a defrost command for any reason, a defrost will initiate after this
time has elapsed from the last defrost. Normally set to 1 hour over the normal defrost
period.
P-44
Def Terminate
The defrost will terminate (defrost control relay off) when the temperature of the defrost
termination probe reaches this value.
If the "defrost termination" probe is not fitted, defrost termination will occur when: -
The "coil in" probe reaches the set point (If fans are selected as "off during defrost")
Or
The "air off" probe reaches the set point (If fans are selected as "on during defrost")
If the "coil in" probe is not fitted, the "air off" probe will be used.
P-45
Def Min Time
Minimum time that a defrost will use (Defrost can’t terminate until this time has elapsed. If
termination temperature is reached during this period, the defrost control relay is turned off,
but the controller will not continue the defrost cycle until the end of the defrost min period)
P-46
Def Max Time
Time period after defrost minimum that defrosts are allowed to terminate
P-47
Drain Down
A period after defrost max to allow the draining of any surplus water
P-48
Recovery Time
The LLV is switched on at the start of this period to allow the temperature to recover to the
normal operating point. This period also inhibits the OT alarm.
Note that if the air-off temperature is still above the OT alarm setpoint when this period
expires, an immediate OT alarm occurs; there is not a further alarm delay.
P-89
Pump Down Time
Time period before the defrost min period to allow for a pump down
P-86
Fan Delay mode
This parameter allows the fans start after a drain-down period to be delayed, either by time
(P-49) or when the temperature point (P-88) is reached. This parameter uses the same
probe strategy as the defrost terminate.
P-49
Fan Delay
Time after a drain-down period before the fans start if P-86 is set to time
P-88
Fan Delay Temp
Temperature at which the fans start after a drain-down period when P-86 is set to
temperature.
P-50
Fans In Defrost
Allows the user to set the fans on or off in defrost.
Note: If the fans are set to on in defrost, they will go off for the drain-down period and then
follow the P-86 rules.
P-91
Defrost Type
Electric – Heater is turned Off when termination probe reaches termination temperature
Electric Cin – Heater cycles on and off in defrost min if termination probes reaches
termination temperature but then falls below it again
P-94
Defrost Hold
Turns the defrost hold feature on and off. When switched on, the controller can be held in
defrost until a remote command from the front end terminates the defrost and starts the
recovery process. Note: defrosts will also terminate when the defrost max time-out period
elapses. This command works in “Defrost Remote” only
P-96
Defrost Skip
Allows user to enable/disable defrost skip. This feature allows the controller to skip
defrosts. If the current defrost terminates on temperature then the controller will skip the
next scheduled defrost providing the previous defrost terminated before the defrost skip
time (P-96). Operates only when the controller is set to local defrost scheduling.
P-97
Defrost Skip Time
Time factor used in defrost skip. The previous defrost has to terminate before this value
expires to allow the controller to skip a defrost.
P-80
Door alarm delay
Delay after the door open input is activated before the alarm occurs. If P-81 and P-81 are
set to switch cooling and fans off when the door is open, this will be overridden.
P-81
Door Closes Valve
This parameter is used to close the LLV or EEV if the door opens.
P-82
Door Stops Fan
This parameter is used to stop the fans if the door opens.
P-60
Lights Mode
Allows the user to set the lights mode: -
 Use a local schedule P-61 to P-74)
 Use a remote schedule (Set up in the system front end)
P-61
Sun Lights On
When P-60 is set to Local, Sunday on time
P-62
Sun Lights Off
When P-60 is set to Local, Sunday off time
P-63
Mon Lights On
When P-60 is set to Local, Monday on time
P-64
Mon Lights Off
When P-60 is set to Local, Monday off time
P-65
Tue Lights On
When P-60 is set to Local, Tuesday on time
P-66
Tue Lights Off
When P-60 is set to Local, Tuesday off time
P-67
Wed Lights On
When P-60 is set to Local, Wednesday on time
P-68
Wed Lights Off
When P-60 is set to Local, Wednesday off time
P-69
Thu Lights On
When P-60 is set to Local, Thursday on time
P-70
Thu Lights Off
When P-60 is set to Local, Thursday off time
P-71
Fri Lights On
When P-60 is set to Local, Friday on time
P-72
Fri Lights Off
When P-60 is set to Local, Friday off time
P-73
Sat Lights On
When P-60 is set to Local, Saturday on time
P-74
Sat Lights Off
When P-60 is set to Local, Saturday off time