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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

Mercury 3 M & E Installation Guide

www.resourcedm.com

Relay State and functional operation

Relay and screen states during defrost

State:

Pump

Down

Defrost Min

Defrost Max

Drain Down

Fan Delay

Recovery

Screen:

DEF

REC

Def LED:

Off

RLY 1 LLV

Closed

Open

RLY 4 Suction Line

RLY 4 Trim on in defrost

RLY 4 Trim off in defrost

Off

RLY 5 Defrost Relay

Off

RLY 3 Lights relay

RLY 2 Fans (On in DF)

Off

RLY 2 Fans (Off in DF)

Off

Defrost Type (P-91)

If P-91 is set to gas, compressor 1 is switched on for the duration of the defrost cycle.

Defrost Termination

Defrost termination will be when the temperature parameter “def terminate” has been reached on the “defrost termination” probe. 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. If the “air off” probe is faulty termination will occur when the time-out

period has elapsed.

Fan Delay after Defrost

The fans will come back on when: -

The fan delay time has elapsed if the “fan delay mode” is set to time

Or If the fan delay mode is set to “temp”, the fans will come on when the defrost termination probe reaches the fan delay set point,

or on the time parameter, whichever occurs first.

If the “defrost termination” probe is not fitted, the fans will come on when: -

The “coil in” probe reaches the control set point (If fans are selected as “off during defrost”)

Or The “air off” probe reaches the control set point (If fans are selected as “on during defrost”)

Relay 1-3 State

Function State

Wired

contact

Relay 4-5 State

Function State

Wired

contact

Relay 1 off

Valve / Comp. A on

N/C

Relay 4 off

Suction or Trims off

N/O

Relay 1 on

Valve / Comp. A off

N/C

Relay 4 on

Suction or Trims on

N/O

Relay 2 off

Fans on

N/C

Relay 4 off

Alarm Relay = Alarm

N/C

Relay 2 on

Fans off

N/C

Relay 4 on

Alarm Relay = OK

N/C

Relay 3 off

Lights on

N/C

Relay 4 off

Compressor B off

N/O

Relay 3 on

Lights off

N/C

Relay 4 on

Compressor B on

N/O

Relay 3 off

Alarm Relay = Alarm

N/C

Relay 5 off

Defrost control off

N/O

Relay 3 on

Alarm Relay = OK

N/C

Relay 5 on

Defrost control on

N/O

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