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6.3.9.4.   Ventilator
When a ventilator is installed, the installer has the option of selecting the
time  interval for  cleaning  the  ventilator. After  the  selections  are  made,
touch SAVE.
• Clean Interval: Selectable from 60, 90, 120, 150 or 180 days. Default
= 90 days
NOTE:  This  option  may  NOT  be  available  with  the  ERVXXNVA
ventilator due to its simplified control design. 
6.3.10.   Utility Curtailment
NOTE: Utility Curtailment and Utility Saver functions are different than
the Utility Demand Response function described in the Owner’s Manual.
Utility Curtailment/Utility Saver uses  the  UTIL and Y2  (or  equivalent)
terminals  on  the  Infinity  System  compressor  section  control  board  to
receive  a  dry  contact  relay  signal  from  the  Utility,  typically  from  the
electric  meter  assembly,  to  signal  a  curtailment  period.  This  section
describes the actions taken in response to that signal. See the equipment
installation instructions for  more information on wiring the compressor
section control board to the Utility connections.
Utility Saver is used to force the equipment to a lower stage (low or off)
when activated by the utility company, typically during peak load times.
This  setup  is  available  only  if  the  equipment  has  a  utility  saver  input
(refer to outdoor equipment installation instructions). This setup controls
the  response  of  the  equipment  when  the  utility  saver  input  is  active.
DISABLED  means  that  the  curtailment  function  is  not  active.  TURN
OFF  means  the  outdoor  unit  is  to  be  turned  off  when  the  curtailment
function is active. LOW STAGE means the outdoor unit will run in lows
stage  when  the  curtailment  function  is  active. After  the  selections  are
made, touch SAVE.