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.
Rev. E 4-19-05
A.S.M.E. VERSION
Test the relief valve at least once a year by lifting up lever.
TO WINTERIZE, OPEN DRAIN VALVE
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.)
RELIEF VALVE
Figure 29.
REMOVE FLOW VALVE BEFORE DRILLING THE NPT PORT
FOR PRV INSTALLATION DRILL THRU THE NPT PORT
RELIEF
VALVE
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.
30
CAUTION
REMOVE THE FLOW VALVE ASSEMBLY WHEN DRILLING THE HOLE TO INSTALL A PRV, OTHERWISE, YOU WILL DRILL INTO THE VALVE ASSEMBLY.
PRESSURE RELIEF VALVE
In some installations, a pressure relief valve (PRV)
Section VI. Maintenance
Maintenance Instruction
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.
Figure 28.
LN
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.
