HTP SSU-20PH - Manual (Page 8)

8
LP-21A Rev. 3.24.14
PART 5 – SIZING THE POOL HEATER
Table 2 – Water Heating Sizing - *Depending on Chart
NOTE: THE SSU-20PH CAN TRANSFER A MAXIMUM OF 200,000 BTU FROM THE BOILER. PLEASE MAKE SURE
TO CORRECTLY SIZE THE CIRCULATOR OFF THE BOILER (SEE TABLE 1).
NOTE: The following is presented as a guide to determine the heating time in hours for water heaters used to heat
swimming pools and baptisteries:
EXAMPLE FORMULA TO ESTABLISH RECOVERY OF POOL:
Boiler 84,000 (BTU/hour) divided by pool capacity (gallons) = factor
TO FIND POOL CAPACITY IN GALLONS
1. Find volume of pool (or baptistery tank) in cubic feet. Length x width x average depth = cubic feet of water.
2. Convert cubic feet of water to gallons = multiply by 7.5.
3. Use SSU-20PH, i.e. 84,000 BTU/h.
4. To determine how long it is going to take to heat up pool, divide 84,000 (BTU/h using SSU-20PH) into pool
capacity (in gallons). The answer should be matched with the figures in the above chart under the required
temperature rise column.
Example:
7500 gallon pool needs to be heater from 40
o
F to 70
o
F (30
o
F rise) = 84,000 BTU divided by 7500 gallons = 11.2*
(*see table above) under 30
o
F rise columns. In less than 48 hours, this temperature rise can be accomplished.
5. The boiler must supply enough BTUs for the gross output of the selected SuperStor. Once the pool is at
temperature (70oF in this example), the SuperStor will require very few BTU/h to maintain the pool at that
temperature.
PART 6 – MAINTENANCE
When heater is not used during winter months, turn off power to heater and drain water from the tank and piping to
prevent freezing.
For winterizing, disconnect tank and pump one gallon of non-toxic, food-grade propylene glycol, FDA rated as GRAS
(Generally Recognized As Safe) into the heat exchanger to prevent freezing.