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SIZING CONDENSER TO EVAPORATOR

HS-66EC Evaporator

MANY TIMES WE GET THE QUESTIONS, "HOW DO YOU SIZE THE CONDENSER WITH YOUR EVAPORATOR?".

HERE ARE SOME HELPFUL GUIDELINES WHEN SIZING.

 

  • SELECT CONDENSING UNIT WITH A LOWER CAPACITY THAN THE EVAPORATOR    ( 90% to 100% OF EVAPORATOR )
  • DESIGN POINT - 38° SST (USE 40°F FOR SIZING PURPOSES) IF RUNNING ROOM AT 55° 
  • GOLDILOCKS TYPE OF CONDITIONS
    • USE A GOOD AVERAGE TEMPERATURE  NOT WORST CASE SCENARIO   
    • ON HOT DAYS JUST LET THE SYSTEM RUN A LITTLE LONGER FOR THE OUT OF BOUNDS CONDITIONS
      • ROOMS ARE SIZED FOR 16 HOUR RUN DAY
    • LOAD ON EVAPORATOR IS CONSTANT- ITS THE CONDENSING UNIT THAT NEEDS TO RUN A LITTLE LONGER
    • SIZE TO A REASONABLE AMBIENT TEMPERATURE
      • IS IT INSIDE?
      • IS IT OUTSIDE?
      • EXAMPLES
        • SAN DIEGO- SIZE FOR 80° NOT 110°
        • PALM SPRINGS- SIZE FOR 100° OR SO AND LET IT RUN LONGER ON THE HOTTEST TIMES OF THE YEAR
    • PUT A FAN CYCLING SWITCH ON THE CU TO KEEP THE HEAD PRESSURE UP TO 80° OR BETTER AMBIENT CONDITIONS TO PROTECT DURING LOW AMBIENT TIMES.
    • CONDENSING UNIT SHOULD HAVE A SUCTION ACCUMULATOR

SO TO SUM IT ALL UP: SIZE AT A SLIGHTLY LOWER LOAD THAN WHAT THE ROOM IS, AT A PLUS 40° SST, AT A REASONABLE AMBIENT TEMPERATURE.