Pressure Relief Valve; Pressure Switch Adjustment; Temperature Rise - Jandy Lite 2 LG Installation And Operation Manual

LITE 2 MODEL LG POOL AND SPA HEATER
Balancing
Valves
From From Main
Filter
Skimmer Drain
Pump
Check
Valve
Manual by-pass is used
only when filtration rate
normally exceeds
125 gallons per minute.
Figure 13. Typical installation.
If the chlorinator is equipped with its own pump,
install it so that it introduces the chlorine downstream
from the heater, and, if possible, below the level of the
heater outlet fitting.
2J. Pressure Relief Valve
A pressure relief valve is not furnished with
the Lite 2 heater. Local plumbing codes may
require it.
To install a pressure relief valve:
1. Remove the 19 mm brass plug on top of the
header and screw in the valve (see Figure 14).
2. The setting of the valve should be at or below
the lowest working pressure of any compo-
nent in the filter system.
2K. Pressure Switch Adjustment
The pressure switch is pre-set at the factory for
normal pool installations. Do not adjust the pressure
switch unless the installation involves special condi-
tions such as:
PRESSURE RELIEF
THERMOMETER
(-29°C TO 52°C)
Figure 14. Thermometer and pressure relief valve
location.
Heater
Heater
Balancing valves for
skimmer and drain.
To
Pool
VALVE
TEMP AND PRESSURE FITTING
(PETE'S PLUG)
Three-way
changeover
Main Pool
valves
Return
Filter
Pump
1. The top of the heater is installed 1 m or more
below the surface of the pool.
2. If any part of the filter system is 1 m or more
above the top of the heater jacket.
NOTE: Do not make the pressure switch
adjustment if the heater is installed more than 4.6 m
below or 1.9 m above the pool surface. Consult
Zodiac Pool Systems, Inc., for recommendations.
On some installations, the piping from the heater
to the pool is very short. The back pressure could be
too low to trigger the pressure switch. If this happens,
it may be necessary to install a directional fitting, or
elbows, where the return line enters the pool. This will
increase back pressure enough for the heater to
operate properly.
2L. Temperature Rise
When the installation is complete, the installer
should then take a temperature rise. Use the figures in
Table 7 to verify proper water flow through the heater.
Table 7. Temperature Rise And Minimum Flow Rates
Minimum
Size
125
175
250
325
400
An automatic, built-in bypass valve maintains
proper flow through the heater at flow rates less than
7.9 liters per second (l/s). If the system filter-flow
rate exceeds 7.9 l/s, a manual bypass valve is re-
quired. Figure 15 shows a manual bypass valve
installed between the heater inlet and outlet. To set
the bypass valve, follow this procedure:
Main Pool
Spa

Temperature Rise

Maximum
°C °C
15 20
18 24
18 24
16 21
17 22
Page 11
Skimmer
Main
Drain
Minimum
Flow Rate
l/s
1.5
1.5
1.9
2.3
2.3