Basic Operation - General Description; Basic System Operation - Pentair Pool Products MiniMax NT Low NOx Series Operation & Installation Manual

Basic Operation
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 .
3. Set the thermostat rocker switch to the center "OFF" position.
4. Open the access doors.
5. Push in the gas control knob slightly and turn the knob clockwise to "OFF".
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.
7. Turn the knob on the gas control counter clockwise to the "ON" position.
8. Replace the doors.
9. Push the thermostat select switch to "POOL" or "SPA" to start the heater.
10. Set the thermostat to the desired temperature.
a. Fan motor starts, which closes draft proving switch.
b. Ignition module is energized and the prepurge cycle is started approximately 15 seconds.
c. Check for powering up the (glow coil) hot-surface ignitor by viewing through the opening holes
on the face plate.
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 472089
20
Rev. B 4-5-02