Manifold Pressure; Special Precautions For Lp Gas; Section 5. Water Connections; Water Piping - Jandy LRZ Electronic Installation And Operation Manual

Page 16
Legacy™ Model LRZE Pool/Spa Heater Installation and Operation Manual
4.2

Manifold Pressure

Con¿ rm that gas supply pressure is correct. If
the gas supply pressure is less than required, check
for undersized pipe between the meter and the heater,
a restrictive ¿ tting, or an undersized gas meter. Gas
supply pressures to the heater, when it is operating, are
listed in Table 5.
CAUTION
Manifold gas pressure for the Legacy Model
LRZ natural gas heaters should be set at 4" WC.
Propane heaters should be set to 9" WC.
ATTENTION
La pression du collecteur de pression pour les
systèmes de chauffage au gaz naturel devrait être
de 4'' WC. Pour les sytèmes de chauffage au gaz
propane devrait être de 9'' WC.
The manifold pressure may be checked by
connecting a manometer to the pressure port on the
outlet side of the valve. The pressure will be zero when
the heater is not running. When the heater is operating
the manifold gas pressure should be 4" WC for natural
gas heaters and 9.0" WC for LP gas heaters.
If the manifold pressure indicated above is not
correct, check the gas train for possible problems.
Check the meter, gas line, gas ¿ ttings, and gas shut
off for under sizing. Check the gas valve inlet for
excess pipe dope, if all is correct, then it may be
necessary to adjust the gas valve regulator. To adjust
the manifold gas pressure, ¿ rst remove the slotted cap
next to the inlet pressure port on the inlet side of the
gas valve. 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 necessary, have been made, make
sure to replace the 1/8" NPT gas valve plugs on the
inlet and 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 ¿ ring, 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 requirements for LP gas. Locate heaters
a safe distance from LP gas cylinders and ¿ lling
equipment. Consult the National Fuel Gas Code
(NFPA 54 / ANSI Z223.1, latest edition), the Natural
Gas and Propane Installation Code in Canada (CAN/
CSA B149.1, latest edition), and any other local
codes and ¿ re protection authorities about speci¿ c
installation restrictions in your area.

Section 5. Water Connections

5.1

Water Piping

Figure 7 illustrates typical piping for pool
equipment 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,
Zodiac Pool Systems, 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
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
7.7) 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 À ooding. Zodiac Pool Systems, Inc. cannot
be responsible for such water loss or À ooding or the
damage caused by either occurrence.
For special installations such as water
connections below the water level of the pool, or for
other questions contact the Zodiac Pool Systems, Inc.
Technical Service department at (800) 822-7933.
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 ¿ lter 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 components.
5.3

Automatic Flow Control Valve

The inlet/outlet header of the Legacy Model LRZ
electronic heater comes equipped with an automatic