Jandy LG125 Installation And Operation Manual

Jandy LG125 Installation And Operation Manual Manual pdf 25 page image

Model LG Pool and Spa Heater Page 23Minimum Minimum MaximumSize GPM (LPM) °F (°C) °F (°C)125 20 (76) 27 (15) 36 (20)175 20 (76) 33 (19) 42 (24)250 25 (95) 33 (19) 42 (24)325 30 (114) 28 (16) 38 (21)400 30 (114) 30 (17) 39 (22)Table 6. Temperature Rise and Minimum Flow Rates5. Insert a pocket thermometer (see Figure 14)through the Pete's plug into the header.6. Turn the filter pump ON and wait 3 minutes. Theheater remains OFF. This allows water from thepool to reach the heater.7. Record the temperature indicated by the ther-mometer (cold water).8. Turn the heater ON following the lightinginstructions found on the inside of the heater.9. Allow the heater to run for about 3 minutes.Record the new temperature reading (heatedwater).10. Subtract the first temperature reading (coldwater) from the second temperature reading(heated water). The difference between the tworeadings is the temperature rise. The tempera-ture rise should be within the range shown inTable 6.11. If the temperature rise is below the minimumrange indicated, two possibilities arise:a. The supply gas volume is too low.b. The system's water flow exceeds 125 GPM(475 LPM), and requires a manual bypass valvefor proper operation (see Figure 7).12. If the temperature rise is above the maximum,there is not enough water flowing through theheater. Check for clogging in the water filter orrestriction in the water pipes.CAUTIONOperating the heater with the temperature riseabove maximum or below the minimum candamage the heater and may void the warranty.13. If the temperature rise is within the correct range,complete the procedure as follows:a. Turn heater OFF.b. Wait 3 minutes, turn filter pump OFF.c. Remove thermometer and Pete's plug.d. Replace the drain plug.7.7 Adjusting the Manual Bypass ValveIf a manual bypass valve is installed, use thefollowing procedures to adjust the bypass valve:1. Clean pool filter.2. Remove drain plug located on the inlet/outletheader of the heater and replace it with a Pete'splug.3. Insert a pocket thermometer (see Figure 15)through the Pete's plug into the header.4. Close manual bypass valve.5. Turn on the temperature control to the OFFposition.6. Repeat steps 6 through 10 of the temperaturerise test (see Section 7.6).7. If the temperature rise is below the minimumstated in Table 6, open the manual bypass valveuntil temp rise climbs between the min. and max.range for your size heater. If the minimumtemperature rise stated in Table 6 cannot bereached with the manual bypass fully open, thenthe gas supply volume is too low.8. If the temperature rise is above the maximum,there is not enough water flowing through theheater. Check for clogging in the water filter orrestriction in the water pipes.9. Once the temperature rise is within the correctrange, safety wire the handle of the manualbypass valve in place and tag the valve toprevent change in the water flow.SECTION 8.Maintenance8.1 Water ChemistryThe mineral content of swimming pool waterincreases daily due to natural evaporation and theaddition of sanitizing chemicals. If the mineral concen-tration in the pool gets too high, the excess mineralswill deposit on the walls of the pool, in the filtersystem, and in the heater tubes.