Laarsen Associates LG, LD 3D. Seasonal Care, 3D-1. Spring and Fall Operation, 3D-2. Winterizing

Model LG & LD Pool and Spa Heater Page 19

3D. Seasonal Care

Caution

Do not operate this heater outdoors at

temperatures below 20 degrees Fahrenheit

(°F) (-7 degrees Celsius [°C]).

3D-1. Spring and Fall Operation

During periods when the pool is only going to be used occasionally, turn the temperature control down to the MIN setting. This prevents the pool from water from becoming chilled, and minimizes the time re- quired to raise the pool water back up to the desired temperature.

In areas subject to only short freeze periods, turn off the heater and run the pump continuously for the length of the freeze period.

If the heater is not going to be used for a long period of time, shut it down completely. Follow the instructions found on the inside of the heater, or pages 17(LD) or 18(LG) of this manual.

3D-2. Winterizing

In areas where freezing temperatures occur in winter, and the pool or spa will not be used, have your service technician perform the following steps:

1.Turn off the main gas supply valve to the heater, outside the heater jacket.

2.Remove heater door.

3.Shut down the heater following the shutdown instructions found on the inside of the heater.

4.Remove the drain plug from the return header (see Figure 21), loosen the drain plug from the inlet/outlet header, and completely drain the heater before the first frost.

5.After all water has drained from the heater, remove the drain plug from the inlet/outlet side. Check for mineral buildup in the openings.

6.Use compressed air to blow out any standing water remaining in the heat exchanger.

7.Grease the threads on the drain plugs and rein- stall plugs, but do not tighten.

8.Disconnect the pressure switch from the siphon loop (copper tubing) (see Figure 22).

3D-3. Spring Start-up

To restart the heater in the Spring, have a profes- sional service technician reassemble the heater as follows:

1.Fill the siphon loop with approximately 5cc of SAE 50, non-detergent oil. Attach the copper tubing to the pressure switch (see Figure 22).

2.Tighten the drain plugs.

3.Turn on the filter pump and circulate water through the heater for 5 minutes. Check for leaks while circulating.

4.Turn on the main gas supply valve to the heater, outside the heater jacket.

5.Turn on the heater following the lighting instruc- tions found on the inside of the heater, or pages 17(LD) or 18(LG) of this manual.

Figure 22. Pressure switch copper tubing.

Figure 21. Heater drain locations.