Laarsen Associates LG, LD 2G-9. Adjusting the Manual Bypass Valve, Typical installation

Model LG & LD Pool and Spa Heater Page 15

Note: When using metal pipe as heat sink, join metal and PVC/CPVC, using metal male and PVC/CPVC female connection.

Figure 20. Typical installation.

11.If the temperature rise is below the minimum range indicated, two possibilities arise:

a.The supply gas volume is too low.

b.The system's water flow exceeds 125 GPM (474 LPM), and requires a manual bypass valve for proper operation (see Figure 19).

12.If the temperature rise is above the maximum, there is not enough water flowing through the heater. Check for clogging in the water filter or restriction in the water pipes.

Caution

Operation with the temperature rise above maximum or below the minimum can damage 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.

2G-9. Adjusting the Manual Bypass Valve

After the manual bypass valve is installed, use the following procedures to adjust the bypass valve:

1.Clean pool filter.

2.Remove drain plug located on the inlet/outlet header of the heater and replace it with a Pete's plug.

3.Insert a pocket thermometer (see Figure 17) through the Pete's plug into the header.

4.Close manual bypass valve.

5.Turn rotary switch (LD) or the rocker switch (LG) on the temperature control to the OFF position.

6.Repeat steps 6 through 10 of the temperature rise test (see Section 2G-8).

7.If the temperature rise is below the minimum stated in Table 6, open the manual bypass valve until temp rise climbs between the min. and max. range for your size heater. If the minimum temperature rise stated in Table 6 cannot be reached with the manual bypass fully open, then the gas supply volume is too low.

8.If the temperature rise is above the maximum, there is not enough water flowing through the heater. Check for clogging in the water filter or restriction in the water pipes.