Check Valve Installation; Automatic Flow Control Valve; Reversible Water Connections - Jandy LG125 Installation And Operation Manual

Model LG Pool and Spa Heater
the pool surface a leak can result in large scale water
loss or flooding. Water Pik Technologies cannot be
responsible for such water loss or flooding or the
damage caused by it.
For special installations such as water connec-
tions below the water level of the pool, or for other
questions contact the Jandy Technical Service depart-
ment at (707)-776-8200 ext 260.

5.2 Check Valve Installation

The heater must be protected from back-
siphoning of water, which can result in dry starts. If
there is any chance of back-siphoning, provide a check
valve between the pool and the filter pump inlet.
Figure 8. Heat exchanger reversal.
When an automatic chemical feeder is installed
in the plumbing, it must be installed downstream of the
heater (see Section 5.7). A check valve must be
installed between the heater and the chemical feeder
to prevent back-siphoning of chemically saturated
water into the heater where it will damage the compo-
nents.

5.3 Automatic Flow Control Valve

The inlet/outlet header of the Lite2 comes
equipped with an automatic flow control valve. The
automatic flow control valve maintains the proper flow
through the heater at rates up to approximately 125
Gallons Per Minute (GPM) (474 liters per minute
[LPM]). If the filter system flow rate is higher than
approximately 125 GPM (474 LPM), install a manual
bypass valve (see Figure 7), then perform a tempera-
ture rise test (see Section 7.6) and adjust the flow
using the bypass valve until the proper temperature
rise is obtained.

5.4 Reversible Water Connections

Water Pik Technologies ships the Lite2 heater
with the water connections on the right side. The Lite2
heater can be installed with the water connections on
either side. It could be necessary, or helpful, to switch
the connections to the left side to improve access for
installation and service. Perform this modification
before installing the heater using the following proce-
dures:
1. Remove heater door.
2. Remove all 8 hex-head screws fastening the top
and lift the top assembly straight up (see Figure
8).
3. Remove rainshield assembly and set it aside.
4. Remove screws that fasten the gap closures to
the jacket and put them aside. Remove gap
closures.
Figure 9. Flue collector hold-down brackets.
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