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higher than the A point at which it passes through the roof, or as permitted by local code. must use a double-wall vent pipe through the roof penetration. must terminate with an approved (listed) roof jack, storm collar, and vent/weather cap. must be not less than 7 ft. above public walkways. must be at least 3 ft. above any outside air intake located within a 10 ft. radius. must NOT be within 3 ft. of an inside corner of the structure. must be at least 1 ft. above grade. must be located the following distances away from any door, window, or gravity air inlet: 4 ft. below 4 ft. horizontally 1 ft. above Air Supply See Air Supply Requirements Table. B A D E F J K L C G Vent termination for side wall installations: must be the same diameter as the vent connector. must be suitable for use with category III appliances which have flue gas temperatures of less than 400 deg. F. may use a single wall vent pipe with permanently sealed seams and joints. Vent pipe extension: Vent for roof penetration installations: L J K Recommended sources for side wall Vent Hood; see page 15, Section Venting. (Table 2 on page 17.) Figure 16. Installation (Indoor) Rev. C 11-1-01 P/N 471593 19 VENTILATION OUTDOOR INSTALLATION ONLY (Outdoor Shelter Installation in Canada, see page 16) For outdoor installation with built in vent, the heater must be placed in a suitable area on a level, noncombustible surface. Do not install the heater under an overhang with clearances less than 3 feet from the top of the heater. The area under an overhang must be open on three sides. Maintain minimum clearances as indicated below. Install a minimum of 4 feet below, and 4 feet horizontally from any opening to a building, see Figure 17. IMPORTANT! When locating the heater, consider that high winds can roll over or deflect off adjacent buildings and walls. Normally, placing the heater at least three feet from any wall will minimize downdraft. NOTE This unit shall not be operated outdoors at temperatures below -20o F. for natural gas. Installation (Outdoor) MINIMAX NT VENTING GUIDELINES OUTDOOR INSTALLATION B C D Must be not less than 7 ft. above public walkways. Must be at least 3 ft. above any forced air inlet located within a 10 ft. radius. A B C D E Vent Termination: Check local building codes for setback requirements. Property Line 4' 1' 4' 4' Walkway 3' A Must be located the following distances away from any door, window, or gravity air inlet: 4 ft. below, or 4 ft. horizontally, or 1 ft. above E Figure 17. 20 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 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 Basic Operation 21 SAFETY CONTROLS AIR PRESSURE (FAN) SWITCH The air pressure switch is a safety device used to insure that the blower (fan) is operating and has b...

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