Zodiac Legacy LRZ Specifications download pdf (Page 15)

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Installation and Operation Manual

Legacy™ Model LRZM Pool/Spa Heater

LRZ Pressure Drop vs Flow

0.5

1.5

2.5

3.5

4.5

0 100 200 300 400 500

Water Flow (LPM)

Pressure Drop (m H2O)

LRZ125

LRZ250

LRZ175

LRZ325

LRZ400

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The Legacy Model LRZ millivolt heater is

shipped with water connections on the right side,

but can be modied in the eld to provide left-side

water connections. This procedure involves remov-

ing the heat exchanger headers and reinstalling them

on opposite ends of the tube assembly. Some of the

heater wiring must be disconnected and re-routed, so

this procedure must be done only by a trained service

technician. Heat exchanger reversals are generally

done before the installation of power and water to the

heater. If you need to reverse the heat exchanger on

a previously installed heater be sure that all electri-

cal power, the gas supply and water supply have been

turned off before starting the procedure. These instruc-

tions have been written to include the steps needed

when reversing the water connections on an existing

installation. If you are reversing the headers on a new

installation, some steps will be ignored.

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.

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The inlet/outlet header of the Legacy Model LRZ

millivolt heater comes equipped with an automatic

ow control valve. The automatic ow control valve

maintains the proper ow through the heater at rates

up to approximately 475 lpm. If the lter system ow

rate is higher than approximately 475 lpm, install a

manual bypass valve (see Figure 6), then perform a

temperature rise test (see Section 11.6) and adjust the

ow using the bypass valve until the proper tempera-

ture rise is obtained.

AQUAPURE

MANUAL BY-PASS DETAIL

MANUAL BY-PASS IS USED

WHEN FILTRATION RATE

EXCEEDS 125 GPM

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Zodiac Legacy LRZ Specifications Page 15

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