User guide

Revision 2.2 Page 17 of 17
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
ML Twin Controller Installation Guide
www.resourcedm.com
Relays
IMPORTANT: Some early versions of Relay modules had relays fitted in position 1 that had a lower N/O contact rating (0.5 HP) Look at
the label on the enclosure lid for the correct Relay rating.
Relay 1 Compressor Relay
Note 1
N/O contact 250 Vac / 16A Resistive Load
N/O contact 250 Vac / 2HP Motor Load
N/C contact 250 Vac / 16A Resistive Load
N/C contact 250 Vac / 1.5HP Motor Load
Relay 2 Selectable N/C contact 240 Vac / 10A Resistive Load
N/C contact 240 Vac / 3A Inductive Load CosФ =0.4
N/O contact 240 Vac / 10A Resistive Load
N/O contact 240 Vac / 3A Inductive Load CosФ =0.4
Relay 3 Defrost N/C contact 240 Vac / 10A Resistive Load
N/C contact 240 Vac / 3A Inductive Load CosФ =0.4
N/O contact 240 Vac / 10A Resistive Load
N/O contact 240 Vac / 3A Inductive Load CosФ =0.4
Relay 4 Selectable N/C contact 240 Vac / 10A Resistive Load
N/C contact 240 Vac / 3A Inductive Load CosФ =0.4
N/O contact 240 Vac / 10A Resistive Load
N/O contact 240 Vac / 3A Inductive Load CosФ =0.4
Relay 5 Selectable N/C contact 240 Vac / 10A Resistive Load
N/C contact 240 Vac / 3A Inductive Load CosФ =0.4
N/O contact 240 Vac / 10A Resistive Load
N/O contact 240 Vac / 3A Inductive Load CosФ =0.4
Note 1 Normally relay 1 operation is from the lower HP NC contact, if the higher HP NO contact is required for normal operation, the
relay 1 option in the menu must be set from its default value (0) to 1.
Damage to relays through out of specification usage will invalidate the warranty.
Part Numbers
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals: PR0123-TWI
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals (100 Units): PR0123-TWI-100
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals (20 Units): PR0123-TWI-20
Each of the above units are supplied with a Controller Display, Display Cable, Relay Board and two PR0240 Probes (NTC2K probe type
with a 7 Meter cable)
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals: PR0127
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals (100 Units): PR0127-100
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals (20 Units): PR0127-20
Revision History
Revision
Date
Changes
V2.2
20/06/2011
New layout and diagrams