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When prompted “For more options hit ENTER”, press ENTER. Use the 
left  and  right  arrow  keys  and  the  ENTER  key  to  access  the  following 
parameters and change their values to those shown below.  
Press ENTER to save the new values. 
Press  CANCEL and  when  Quick Setup  is displayed  scroll across  to  the 
Relays menu. Press ENTER and press ENTER again when * Relay 1 is 
shown on the screen. Scroll across to P*216 and set the following. This will 
set up the differential control relay. 
After pressing ENTER to save the parameter, press CANCEL until Relays 
is displayed on the screen.  
On the wallmount model, to display the Differential on the main display line 
of the upper LCD, Point 1 Level on the auxiliary display of the upper LCD 
and  Point  2  Level  on  the  main  display  on  the  lower  LCD,  change  the 
following parameters. Press the   hotkey to switch back to point 1. The 
upper  LCD  should  now  show  Relays.  Press  the  Right  arrow  key  until 
Display  is  shown on  the screen. Press  ENTER  and  press  ENTER again 
when P1 Options is displayed on the screen. Use the left and right arrow 
keys and ENTER key to change the following parameter and press ENTER 
to save the new value. 
After pressing ENTER to save the parameter, press CANCEL to display P1 
Options  on  the  screen.  Press  the  Right  arrow  key  until  P1  Auxiliary  is 
displayed and press ENTER. 
Use the left and right arrow keys and ENTER key to change the following 
parameter and press ENTER to save the new value. 
 
Programming is now complete and the unit can be returned to the run mode, 
press CANCEL until Run Mode? Is displayed on the LCD press ENTER, 
and the Ultra Twin will return to the Run Mode.