Specifications
Legacy™ Model LRZM Pool/Spa Heater
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Installation and Operation Manual
Conrm 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 inlet
pressures to the heater, when it is operating, are listed
in Table 2.
Burner gas pressure for the Legacy Model LRZ
natural gas heaters should be set to the values
listed in Table 2.
The burner pressure may be checked by connect-
ing a manometer to the pressure port on the burner.
Refer to Figure 5. The pressure will be zero when the
heater is not running. When the heater is operating the
burner gas pressure should be the values listed in
Table 2.
If the burner 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 burner 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 increas-
es the burner pressure when turned clockwise and
decreases the burner pressure when turned counter-
clockwise. After measurements, and adjustments if
necessary, have been made, make sure to replace the
test point plugs on the inlet and burner pressure ports,
and the cap on the burner 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 2. Also check the pressure with the heater off.
LPG 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 recom-
mended.
Consult any local code and re protection author-
ities about specic installation restrictions in your area.
Figure 6 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,
Zodiac recommends the installation of a pressure relief
valve on the heater (see Section 5.7).
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 accom-
modate this effect if the heater water connections
are no more than 1.8 m below the pool water surface
and no more than 4.5 m above it. See instructions for
pressure switch adjustment (Section 5.7) 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 ooding. Zodiac cannot be responsible for such
water loss or ooding 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 consult your local Zodiac dealer.
To verify that the minimum ows required
for the heater are met, a hydraulic head loss curve
is shown in Figure 7. This should be checked when
installing this heater into a new or existing piping
system. This should also be consulted when installing
a new pump.
A check valve can interfere with the proper
operation of certain Suction Vacuum Release
System (SVRS) products. To avoid possible en-
trapment hazard, serious injury, or death, make
sure to review the operation/owners manual of
your particular SVRS product before installing
the check valve.
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 lter pump inlet.