SIZING A CONDENSER TO OUR UNITS
Found one of our units that will work perfectly with your application but you can’t seem to figure out what condenser to use?
Here is a quick few-step process on how to properly sizing a condenser to our units can help with your planning.
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 fo 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 condenser 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