Hayward H150FDN All models English - Page 6

SECTION 2. HEATER SIZING Selecting the correct size heater: Factors influencing heater sizing include pool/ spa size, average wind velocity, ambient temperature and desired increase in temperature over ambient. A pool/spa in a warm area with little or no wind will not require as large a heater as one in a cool, windy location. Detailed sizing information is provided below. For a swimming pool: 1. Determine pool's surface area in square feet. For indoor pool installations divide the pool's surface area by 3. Pool Surface Area: Figure 1 5. Locate in Figure 2 the surface area equal to or just greater than the pool's surface area and the temperature degree rise and select the appropriate heater model. Figure 2 is based on 3 1/2 MPH wind velocity and elevation of up to 2,000 feet above sea level. When not in use, keep pool covered to reduce heat loss, chemical usage and dirt load on the filtering system. For a spa or hot tub: Determine spa capacity in gallons (surface area x average depth x 7 1/2). The reference table lists the time required in minutes to raise the temperature of the spa/hot tub by 30°F. Locate in the table below the spa/hot tub size in gallons equal to or just greater than the spa/hot tub size in gallons. Select the desired time to raise the spa/hot tub temperature 30°F, read to the left and select the appropriate heater model. This guide can be adjusted for other temperatures rises. For example, if a 15°F increase in temperature is desired, simply divide the time for 30°F rise by the ratio of 30/15 = 2. 2. Determine desired pool water temperature (usually 78 -82°F). ! NOTE: Heat losses and/or heat absorbed by spa walls (such as concrete) or other objects will add to the heat-up time. 3. Determine average air temperature of coldest month of use. Spa sizing is based on an insulated and covered spa. Always 4. The temperature rise is the difference between cover spa or hot tub when not in use to minimize heat loss and 2 & 3. New Figure 2 for Manual 1302704001 rev F, page 4evaporation. VEW 2/7/2013 Figure 2 - Recommended Heater Model Temp. Rise °F 10° 15° 20° 25° 30° Model Pool Surface Area in Square Feet H150 1,385 924 693 554 462 H200 1,848 1,232 924 739 616 H210 1,988 1,326 994 795 663 H250 2,309 1,540 1,155 924 770 H300 2,771 1,848 1,386 1,109 924 H350 3,233 2,156 1,617 1,293 1,078 New FHig4u0re0 3 for Manu3a,l61935027040021,4re6v3F, page 41,848 VEW 2/7/2013 1,478 1,232 35° 396 528 568 660 792 924 1,056 Model 200 H400 9 H350 11 H300 12 H250 15 H210 17 H200 19 H150 25 Figure 3 - Recommended Heater Model Spa/Hot Tub Size in Gallons 300 400 500 600 700 800 900 Time in Minutes to Raise Spa/Tub Temperature 30°F 14 19 23 28 33 37 42 16 21 27 32 37 43 48 19 25 31 37 44 50 56 22 30 37 45 52 60 67 26 35 44 52 61 70 78 28 37 47 56 66 75 84 37 50 62 75 87 100 112 1,000 47 54 62 75 87 94 125 4