Adjusting The Manual Bypass Valve - Jandy LJ Installation And Operation Manual

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13. 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 tempera-
ture rise should be within the range shown in
Table 7.
Table 7. Temperature Rise and Minimum Flow Rates
Minimum
Size GPM (LPM)
125 20 (76)
175 20 (76)
250 25 (95)
325 30 (114)
400 30 (114)
14. 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
(475 LPM), and requires a manual bypass
valve for proper operation. Install a manual
bypass (see Figure 7) and proceed
to Section 7.8.
15. 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
Operating the heater with the temperature rise
above maximum or below the minimum can
damage the heater and may void the warranty.
ATTENTION
Opérer le chauffe-piscine au-dessus du niveau
de température maximale ou sous le niveau de
température minimale recommandée, peut
endommager le chauffe-piscine et ainsi annuler
la garantie.
16. If the temperature rise is within the correct
range, complete the procedure as follows:
a. Set the controller to 'OFF' by repeatedly
depressing the SELECT key until the
display shows that the heater is 'OFF'.
b. Turn the filter pump off by pressing the
PUMP key and allow up to five minutes for
the pump to shut down.
Minimum Maximum
°F (°C) °F (°C)
27 (15) 36 (20)
33 (19) 42 (24)
33 (19) 42 (24)
28 (16) 38 (21)
30 (17) 39 (22)
c. Turn off the power to the filter pump at the
circuit breaker.
d. Remove thermometer and Pete's plug.
e. Replace the drain plug.
f. Turn on the power to the filter pump at the
circuit breaker.
g. Return the pool temperature control to the
desired temperature. Repeatedly depress the
MODE key until the indicator at the top of
the display shows 'POOL SET'. Press the
ENTER key. Then use the UP and DOWN
keys to set the heater to the desired
temperature. Press the ENTER key again.

7.8 Adjusting the Manual Bypass Valve

After the manual bypass valve is installed, use
the following procedures to adjust the bypass valve:
1. Make sure the pool filter is clean.
2. If the filter pump is on, turn it off by pressing the
PUMP key and allow up to five minutes for the
pump to shut down.
3. Turn off the power supply to the heater at the
circuit breaker panel.
4. Remove the drain plug located on the inlet/outlet
header of the heater and replace it with a Pete's
plug (see Figure 15).
5. Insert a pocket thermometer (see Figure 15)
through the Pete's plug into the header.
6. Turn the circuit breaker on to supply the heater
with power.
7. Close manual bypass valve.
8. Set the controller to 'OFF' by repeatedly depress-
ing the SELECT key until the display shows that
the heater is 'OFF'.
9. Repeat steps 8 through 13 of the temperature
rise test (see Section 7.7).
10. If the temperature rise is below the minimum
stated in Table 7, open the manual bypass valve
until temperature rise climbs between the min.
and max. range for your size heater. If the
minimum temperature rise stated in Table 7
cannot be reached with the manual bypass fully
open, then the gas supply volume is too low.