Section 5. Water Connections; Check Valve Installation; Automatic Flow Control Valve; Reversible Water Connections - Jandy LJ Installation And Operation Manual

Model LJ Pool and Spa Heater
from LP gas cylinders and filling equipment. Consult
the National Fuel Gas Code (NFPA 54 / ANSI
Z223.1, latest edition), the Natural Gas Installation
Code in Canada (CAN/CSA-B149.1, latest edition),
and any other local codes and fire protection authori-
ties about specific installation restrictions in your area.
SECTION 5.
Water Connections
5.1 Water Piping
Figure 7 illustrates typical piping for pool equip-
ment in pool/spa combination pools.
For normal installations, do not install a shutoff
valve or any kind of variable restriction in the water
piping between the heater outlet and the pool/spa. In
special installations where a shut-off valve, diverter
valve or other variable restriction is required in the
plumbing between the heater outlet and the pool, Jandy
Pool Products, Inc. recommends the installation of a
pressure relief valve on the heater (see Section 5.6).
Arrangement of pool system components other
than as illustrated in these diagrams can affect the
operation of the heater's water pressure switch.
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
accommodate this effect if the heater water connec-
tions 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
7.6) 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 either occurrence.
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.
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) (475 liters per minute
[LPM]). If the filter system flow rate is higher than
approximately 125 GPM (475 LPM), install a manual
bypass valve (see Figure 7), then perform a tempera-
ture rise test (see Section 7.7) 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
Figure 8. Heat exchanger reversal
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