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enGlisH
Installation and Operation Manual
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Legacy™ Model LRZM Pool/Spa Heater
LRZ Pressure Drop vs Flow
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0
100
200
300
400
500
Water Flow (LPM)
P
re
ss
ur
e
Dr
op
(m
H
2O
)
LRZ125
LRZ250
LRZ175
LRZ325
LRZ400
5.5
reversible Water Connections
The Legacy Model LRZ millivolt heater is
shipped with water connections on the right side,
but can be modified in the field 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.
5.4
automatic Flow Control Valve
The inlet/outlet header of the Legacy Model LRZ
millivolt 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 475 lpm. If the filter system flow
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
flow 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
Figure 6. typical piping installation
Figure 7. Hydraulic Head loss Curve
Содержание Legacy LRZ
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