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below 4 ft. horizontally 1 ft. above Air Supply Clearances indicated are for non-mechanical air supply inlet to the building. For mechanical air supply inlet, a minimum horizontal clearance of 10 feet should be maintained away from the vent termination. Vent termination for side wall installations: must be the same diameter as the vent connector. must be suitable for use with category III appliances with flue gas temperature ratings less than 400 deg. F. may use a single wall vent pipe with permanently sealed seams, joints and proper insulating materials. Vent pipe extension: Vent for roof penetration installations: Recommended sources for side wall Vent Hood; see "Section Venting". vent terminated at least 24" above any object within 10 ft. Ridge Vent Cap Chimney/Gas Vent 3 ft. min. 2 ft. min. Roof Jack Roof Thimble More Than10 ft. Figure 12. Section III. Installation P/N 472089 Rev. E 4-19-05 18 OUTDOOR INSTALLATION For outdoor installation with an exhaust grill, 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. IMPORTANT! • In an outdoor installation it is important to ensure water is diverted from overhanging eves with a proper gutter/drainage system. The heater must be set on a level foundation for proper drainage. • Under certain conditions, “heavy rains or unusually high winds”, it may be necessary to install an outdoors vent. In this situation, use Outdoor Vent Kit, P/N 460424, (see below). • This unit shall not be operated outdoors at temperatures below -20o F. CAUTION If installing the heater next to or near an air conditioning unit or a heat pump, allow a minimum of 36 in. between the air conditioning unit and the heater. (Outdoor Shelter Installation in Canada, see page 15) Section III. Installation VENTING GUIDELINES OUTDOOR INSTALLATION Must be at least 3 ft. above any forced air inlet located within a 10 ft. radius. Vent Termination: Must be located 4 feet away from the building wall openings, and at the following distances away from any door, window, or gravity air inlet: 4 ft. below, 4 ft. horizontally Check local building codes for setback requirements. Force Air Inlet Property Line 4' 4' 4' 3' SIDE VIEW Building Window Heater (side view) Exhaust Grill (Vent) 4 ft. 4 ft. Figure 13. GASKET SCREWS (6) METAL FLANGE SCREWS (6) GASKET EXHAUST GRILL Figure 14. Figure 15. OUTDOOR VENT KIT 1. Remove the six (6) retaining screws from the old exhaust grill and discard the screws, gasket, and exhaust grill as shown in Figure 14. 2. Install the Outdoor Vent Kit, (P/N 460424), as shown in Figure 15. Make sure the holes in the gasket, metal flange of the main vent assembly, and heater cover are aligned before securing into place using the six (6) screws provided in the Outdoor Vent Kit. Section III. Installation 19 ELECTRICAL CONNECTIONS Electrical Rating 60 Hz 120 / 240 Volts AC, single phase CAUTION This heater is designed to operate at 120 or 240 VAC. It is not recommended to be connected to OR operate on a 208 VAC. NOTE • The MiniMax NT LN heater is prewired for 240-volt AC connection using the “RED” connector and the “BEIGE” common connector; see below, Figure 16. For 120-volt AC supply, remove the “BEIGE” common connector and plug it into the “BLUE” common connector. • When connecting the power supply to the “Line Terminal Block” inside the junction box, follow the polarity as shown below. Connecting to 120 VAC, make sure that you connect the wire to the terminal (L), the neutral wire is connected to the neutral terminal (N) and the ground is connected to the ground terminal (GND); see below, Figure 17. • If any of the original wiring supplied with this heater must be replaced, installer must supply (No. 18 AWG, 600V, 105° C. U.L. approved AWM low energy stranded) copper wire or it’s equivalent. Thermal fuse wiring must be replaced with 18 AWG, 600V, 150° C. temp. rating. CAUTION The installation must conform with local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes. If an external electrical source is utilized, the heater, when installed, must be electrically grounded and bonded in accordance with local codes or, in the absence of local codes, in the USA, with the National Electrical Code, ANSI/NFPA 7; in Canada, with Canadian Electric Code, CSA C22.1. Always use crimp type connectors when connecting two wires. You need to open the right door then remove the control panel cover for servicing the Line Terminal Block as shown in Figures 16 & 17, (see item 40 in the exploded view on page 33). LINE TERMINAL BLOCK L N GREEN WIRE GROUND CONNECTION Figure 16. RED 240V CONNECTOR BEIGE COMMON CONNECTOR BLUE 120V CONNECTOR TRANSFORMER CONNECTOR TERMINAL BLOCK FOR AC INPUT 120 / 240 VOLT SINGLE PHASE "See Below"...