SIZING CONDENSER TO 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.