Check Valve Installation; Automatic Flow Control Valve; Reversible Water Connections - Jandy Lite2 Installation And Operation Manual

Model LD Pool and Spa Heater
Location of the heater above or below the pool water
surface can also affect operation of the switch. In
general, the pressure switch can be adjusted to accom-
modate this effect if the heater water connections are
no more than six feet below the pool water surface
and no more than 15 feet above it. See instructions for
pressure switch adjustment (Section 7.5) in the heater
start-up section of this manual for more information
about this.
Note that when pool equipment is located below
the pool surface a leak can result in large scale water
loss or flooding. Jandy Pool Products, Inc. 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-siphon-
ing 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.
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 6), 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

Jandy Pool Products, Inc. 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
7).
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.
5. Remove the screws securing the two flue
collector hold down clamps and remove the
clamps (see Figure 8). Remove flue collector.
Figure 7. Heat exchanger reversal.
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