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P/N 472089 Rev. E 4-19-05
30
ENERGY SAVING TIPS
1. If possible, keep pool or spa covered when not in
use. This will not only cut heating costs, but also
keep dirt and debris from settling in the pool and
conserve chemicals.
2. Reduce the pool thermostat setting to 78° F. or
lower. This is accepted as being the most healthy
temperature for swimming by the American Red
Cross.
3. Use an accurate thermometer.
4. When the proper maximum thermostat settings
have been determined, tighten the thermostat knob
stopper.
5. Set time clock to start circulation system no earlier
than daybreak. The swimming pool loses less heat
at this time.
6. For pools that are only used on the weekends, it is
not necessary to leave the thermostat set at 78° F.
Lower the temperature to a range that can be
achieved easily in one day. Generally, this would
be 10° F. to 15° F., if pool heater is sized properly.
7. During the winter or while on vacation, turn the
heater off.
8. Set up a regular program of preventative
maintenance for the heater each new swimming
season. Check heat exchanger, controls, burners,
operation, etc.
PRESSURE RELIEF VALVE
In some installations, a pressure relief valve (PRV)
is required on the MiniMax NT LN Series. To install a
PRV, remove the
access doors,
remove Flow Valve
assembly, then
carefully drill a
3/8 in. hole in
center of 3/4 in.
NPT port (on main
header) being
careful to drill only
through wall at
bottom of 3/4 in.
NPT port and no
deeper—now thread in
the 3/4 in. NPT PRV.
NOTE: (A.S.M.E.
version varies slightly.
It is of bronze
construction, and is
supplied with the
A.S.M.E. Section IV,
pressure relief valve
pre-installed at
factory.)
Test the relief valve
at least once a year
by lifting up lever.
FOR PRV
INSTALLATION
DRILL THRU
THE NPT PORT
RELIEF
VALVE
REMOVE FLOW VALVE
BEFORE DRILLING
THE NPT PORT
RELIEF VALVE
TO WINTERIZE,
OPEN DRAIN VALVE
A.S.M.E. VERSION
CAUTION
REMOVE THE FLOW VALVE ASSEMBLY WHEN DRILLING
THE HOLE TO INSTALL A PRV, OTHERWISE, YOU WILL
DRILL INTO THE VALVE ASSEMBLY.
Section VI. Maintenance
Maintenance Instruction
Figure 29.
It is recommended that you check the following items at
least every six months and at the beginning of every
swimming season.
1. Examine the venting system. Make sure there are no
obstructions in the flow of combustion and
ventilation air.
2. Visually inspect the main burner and the hot surface
ignitor. The normal color of the flame is blue. When
flame appears yellow, burners should be inspected
and cleaned. Check ignitor for damage.
3. Inspect the heat exchanger for soot. Clean as
necessary.
4. Remove burner tray and clean burners and main
burner orifices.
5. Keep the heater area clean and free from
combustibles and flammable liquids.
6. Check wire ends and wire connections. They should
be clean and tight.
7. Check the gas pressure (supply and manifold) as
described in this manual.
A.S.M.E. VERSION
LOW-NOx
LN
Figure 28.