Pentair 250, 300 installation manual General Description, Basic System Operation, Basic Operation

Basic Operation 20

GENERAL DESCRIPTION

The MiniMax NT Low NOx Pool and Spa Heater is a fan-assisted induced draft appliance. The MiniMax NT Low NOx is available in 200,000, 250,000, 300,000 and 400,000 btu/hr. capacities and are certified for both indoor and outdoor installations. The MiniMax NT Low NOx version natural gas pool heater must be used for installations in the South Coast Air Quality Management District (SCAQMD)—these heaters are certified to comply with SCAQMD Rule 1146.2 and also meet Ventura Co. APCD Rule 74.11.1.

The MiniMax NT Low NOx is designed to operate both in stackless outdoor installations and in indoor stack vent installations—the indoor installation may be made using Kit 460506 or 460507; see pages 6 and 17, vertical vent pipe or with a horizontal vent pipe and a Listed side-wall vent.

BASIC SYSTEM OPERATION

TO OPERATE HEATER

1.Start pump, make sure the pump is running and is primed, to close water pressure switch and supply power to heater.

2.Set thermostat to lowest setting by using up/down arrow keys. See page 24.

3.Push the off key on the Pentair temperature controller 7800 (the amber “off “ led will illuminate). See page 24.

4.Open the access doors.

5.Push in the gas control knob slightly and turn the knob clockwise to “OFF”. See page 5 Natural Gas Instructions.

6.Wait (5) minutes to clear out any gas. If you then smell gas STOP. Follow the safety information (stated earlier in the lighting instructions section). If you don’t smell gas, go to the next step. See page 5 Natural Gas Instructions.

7.Turn the knob on the gas control counter clockwise to the “ON” position. See page 5 Natural Gas Instructions.

8.Replace the doors.

9.Push either the “Pool” or “Spa” key to start the heater. NOTE: “Pool” key is Factory set at 78° and “Spa” key is set at 104°.

10.Set the thermostat if needed by using the up/down arrows to set the desired temperature.

a.Fan motor starts, which closes draft proving switch.

b.Ignition module is energized after fan prepurge cycle is completed approximately 2 minutes.

c.Check for powering up the (glow coil) hot-surface ignitor by viewing through the sight glass.

11.The ignitor will warm up and then gas valve opens to ignite the main burners.

12.Heater will operate until desired temperature is reached.

P/N 471593 Rev. C 11-1-01