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WATERPIK TECHNOLOGIES INC.
2G-7. Automatic Flow Control Valve
The automatic flow control valve maintains the
proper flow through the heater at rates up to approxi-
mately 125 Gallons Per Minute (GPM) (474 liters per
minute [LPM]). If the system filter-flow rate is higher
than approximately 125 GPM (474 LPM), install a
manual bypass valve (see Figure 20), then perform a
temperature rise test (see Section 2G-8) and adjust the
flow using the bypass valve until the proper tempera-
ture rise is obtained.
2G-8. Temperature Rise
A temperature rise test confirms proper water
flow through the heater. The temperature rise is the
difference between the temperature of the pool or spa
water before and after heating, as measured in the
header. Perform the following temperature rise test
when the installation is complete:
1. Make sure the pool filter is clean.
2. Set the rotary switch (LD) or rocker switch (LG)
on the temperature control panel (see Figure 18)
to OFF.
3. Turn the filter pump off.
4. Remove the drain plug located on the inlet/outlet
header of the heater and replace it with a Pete's
plug (see Figure 17).
5. Insert a pocket thermometer (see Figure 17)
through the Pete's plug into the header.
Figure 18. Temperature controls.
Figure 19. Pressure switch adjustment.
6. Turn the filter pump on and wait 3 minutes. The
heater remains off. This allows water from the
pool to reach the heater.
7. Record the temperature indicated by the ther-
mometer (cold water).
8. Turn the heater ON following the lighting in-
structions found on the inside of the heater.
9. Allow the heater to run for about 3 minutes.
Record the new temperature reading (heated
water).
10. Subtract the first temperature reading (cold
water) from the second temperature reading
(heated water). The difference between the two
readings is the temperature rise. The temperature
rise should be within the range shown in Table 6.
a) Model LD Temperature Control
b) Model LG Temperature Control
NOTE: Heater should not be allowed to fire on
low speed.
4. Turn rotary switch (LD) or rocker switch (LG) to
ON. Heater should start.
5. Pry out the top rubber dust plug on the top of the
pressure switch.
6. Use a 7/32 inch (5.55 mm) Allen wrench to turn
the adjustment screw very slowly clockwise until
the heater goes off (see Figure 19).
7. Slowly turn the pressure switch adjustment screw
counterclockwise one-quarter turn. The heater
should come back on.
8. Check the adjustment by turning the filter pump
OFF. The heater should shut off immediately. If
it does not, restart the filter pump and repeat
Steps 6 and 7. Check the adjustment again.
9. Return the pool temperature control to the desired
temperature.
Minimum Minimum Maximum
Size 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 Rates