LX and LT Low NOx Pool/Spa Heater Page 13
4.3 Special Precautions for LP Gas
LP Gas is heavier than air and can therefore
more readily collect or “pool” in enclosed areas if
provision for proper ventilation is not made. Installation
of pool heaters in enclosed areas such as pits is not
recommended. However, if such an installation is
required be sure to pay special attention to proper
ventilation for LP gas. Locate heaters a safe distance
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 10 illustrates typical piping for pool
equipment in pool/spa combination pools. With its
electronic control, the LX and LT Low NOx heaters
are particularly suited for this type of pool 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.
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
Figure 10. Typical Piping Installation
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
7.5) 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. Waterpik Technologies cannot be
responsible for such water loss or flooding or the
damage caused by either occurrence.
5.2 Check Valve Installation
Install a check valve in the plumbing between
the pool inlet and the heater if there is any chance of
back-siphoning.
Do not install any valve in the piping between the
heater outlet and the pool, unless it is being used as a
diverter valve. For special installations such as water
connections below the water level of the pool, or for
other questions contact the Technical Service depart-
ment at (707) 776-8200 ext. 260.
5.3 Automatic Flow Control Valve
The inlet/outlet header of the LX and LT Low
NOx heater 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 9),
then perform a temperature rise test (see Section 7.6)
and adjust the flow using the bypass valve until the
proper temperature rise is obtained.
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