Waterpik Technologies LG - Manual (Page 14)

Page 12
the "Natural Gas and Propane Installation Code"
(CAN/CSA-B149.1), and any local codes and fire
protection authorities about specific installation restric-
tions 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,
Water Pik Technologies 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
7.5) in the heater start-up section of this manual for
more information about this.
Note that when pool equipment is located below
NPT protective plug form the port and install the
appropriate 1/8" NPT fitting to connect your manom-
eter. The pressure will be zero when the heater is not
running. When the heater is operating the manifold gas
pressure should be 4.0" WC for natural gas heaters
and 9.0" WC for LP gas heaters.
To adjust the manifold gas pressure, first remove
the slotted cap on the top of the gas valve to the right
of the control knob. Under the slotted cap is a slotted
plastic screw which increases the manifold pressure
when turned clockwise and decreases the manifold
pressure when turned counterclockwise.
After measurements, and adjustments if neces-
sary, have been made, make sure to replace the 1/8"
NPT plug on the manifold pressure ports, and the cap
on the manifold pressure adjustment screw. It is
extremely important to replace these parts before
leaving the installation. Failure to do so can result in
damage to property or injury or death.
With the heater firing, the pressure must be
within the range shown in Table 5. Also check the
pressure with the heater off.
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. In the
United States, consult the "National Fuel Gas Code"
(NFPA 54 / ANSI Z223.1, latest edition) or in Canada,
Note: When using metal pipe as heat sink, join metal and PVC/CPVC, using metal male and PVC/CPVC female connection.
Figure 7. Typical installation.