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1 1 1
®
MiniMax NT Pool & Spa Heaters
OPERATION & INSTALLATION MANUAL
To
Consumer
Retain For
Future
Reference
U.S. Patent Numbers
6,295,980
5,318,007 - 5,228,618
5,201,307 - 4,595,825
WARNING
FOR YOUR SAFETY - READ BEFORE OPERATING
• If you do not follow these instructions exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
• Improper installation, adjustment, alteration, service or maintenance can cause
property damage, personal injury or death.
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2 Table of Contents Section I. Heater Identification Information ........................................................... 3 Section II. Introduction ............................................................................................ 4 Important Notices ......................................................................................................................................................................... 4 Warranty Information ........................................
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Section I.Heater Identification Information 3 Heater Identification Information To identify the heater, see rating plate on the inner front panel of the heater. There are two designators for each heater, one is the Model Number and the other is the Heater Identification Number (HIN). a. Heater Identification Number (HIN) The following example simplifies the identification system: 1) HTR : Heater 2) (200, 250, 300 or 400) : Input rating (Btu/hr) X 1000 3) NT : MiniMax NT Series 4) STD or TSI :
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Section II. Introduction 4 Introduction ® MiniMax NT Pool and Spa Heaters Congratulations on your purchase of a MiniMax NT high performance heating system. Proper installation and service of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment. The MiniMax NT is a compact, lightweight, efficient, induced-draft, gas fired high performance pool and spa heater that can be directly connected to schedule 40 PVC pipe. The MiniMax NT also comes equipped w
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Section II. Introduction 5 CODE REQUIREMENTS 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. 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. CONSUMER IN
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Section III. Installation 6 Installation Instructions SPECIFICATIONS These installation instructions are designed for use by qualified personnel only, trained especially for installation of this type of heating equipment and related components. Some states require installation and repair by licensed personnel. If this applies in your state, be sure your contractor bears the appropriate license. See Figure 1 for Outdoor and Indoor Installations. DIMENSIONS IN INCHES 24.05 Heater Depth 3.50 MODEL
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Section III. Installation 7 MANUAL BY-PASS Where the flow rate exceeds the maximum 120 GPM, a manual bypass should be installed and adjusted. After adjustments are made, the valve handle should be TO PUMP removed to avoid tampering. See Figure 2. POOL POOL FILTER MANUAL HEATER BY-PASS GATE CHECK VALVE VALVE M) odelM* in. (GPM Max. (GPM) CHECK VALVE 20 00 20 12 Figure 2. FROM POOL 20 50 30 12 PLUMBING CONNECTIONS 30 00 30 12 The MiniMax NT heater has the unique capability of direct 40 00 40 12
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Section III. Installation 8 WATER CONNECTIONS Reversing Headers — Reversible Inlet/Outlet Connection The MiniMax NT Series heater is factory assembled NOTE with right side inlet/outlet water connections. The Do NOT remove the high-limit and pressure inlet/outlet header can be reversed for left side water switches or the thermistor from the front header connections without removing the heat exchanger. during the reversing procedure, as they will be in the proper location when installed on the lef
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Section III. Installation 9 Reversible Inlet/Outlet Connection, cont’d. 9. Install the temperature sensing probe by passing On the MiniMax NT Series heater there is insulation the wires through the hole provided on the left installed by the factory on the return head side of the side of the brace panel. Route wires through the heaters. This insulation is there so that if the heads support bracket. are reversed in the field, during initial installation of the heater, the high limits will be insu
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Section III. Installation 10 GAS CONNECTIONS GAS LINE INSTALLATIONS Before installing the gas line, be sure to check which gas the heater has been designed to burn. This is important because different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is designed to burn. The tables, shown on page 11, show which size pipe is required for the distance from the gas meter to the heater. The table is for natural gas at a specific gravity
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Section III. Installation 11 GAS PIPE SIZING Table 2. PIPE SIZING FOR GAS LINE CONNECTIONS MAXIMUM EQUIVALENT PIPE LENGTH (Ft.) Natural Gas at 1000 B.T.U. per Cubic Foot Propane Gas at 2500 B.T.U. per Cubic Foot 1” /2” 3” /4 1”1” -1/41” -1/2 2” 2-1/2 NO ATPT RNO APT RNO APT RNO APT RNO APT RNO APT RNO A PR MODEL 2- 00 2’ 0’3’ 08’ 01’ 252’ 504’ 50600 ------ 2- 50 1’ 0’2’ 0 5’ 07’ 01’ 502’ 505’ 00600 ----- 3- 00 - 1’ 0’3’ 05’ 01’ 002’ 003’ 504’ 00600 ---- 400 --- 1’ 0’2’ 06’ 01’ 001’ 502’ 004’ 504
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Section III. Installation 12 TESTING GAS PRESSURE Inlet Manifold Inlet Manifold 1. Push the power switch to “OFF”. 2. Turn the gas valve knob to “OFF”. 3. Remove 1/8 in. NPT plug on the outlet side of the valve and screw in the fitting from the Manometer kit. 4. Connect the Manometer hose to the fitting. 5. Turn the gas valve knob to “ON”. 6. Turn on the heater and read the Manometer. 7. The Manometer must read per the values of the Gas Pressure Requirement Table, on manifold side of the gas val
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Section III. Installation 13 INDOOR VENTING — General Requirements The vent pipe must be the same size or larger. The MiniMax NT heaters are capable of a 360-degree discharge rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400° F. The total length of the horizontal run must not exceed the length that is listed below in the tables. NOTE The allowable vent runs for each stack pipe diameter are different and can not be exceeded. Each 90-degree elb
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DOOR Section III. Installation 14 INDOOR INSTALLATION (USA ONLY) Chimney or Gas Vent Vent Cap and Riser Furnished by Installer OUTDOOR SHELTER INSTALLATION (CANADA) See page 15 for Vent Adaptors All products of combustion and vent gases must be completely removed to the outside atmosphere through a vent pipe which is connected to the stack adaptor. A vent Outlet Air Opening pipe extension of the same size must be connected to the vent adaptor and extended at least 2 feet higher than highest poi
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Section III. Installation 15 Air Supply Requirements Guide COMBUSTION AIR SUPPLY for MiniMax NT Heaters For indoor installation, the heater location must Net Free open Area for provide sufficient air supply for proper combustion Each Opening * (Square Inches) and ventilation of the surrounding area. Heater Ducted from Direct from Size Outside Outside The requirements for the air supply specify that the room in which a heater is installed should be provided 20 00 10 0 5 with two permanent air sup
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16 Section III. Installation P/N • Réf. 472090 Rev. G • Rév. G 5-27-04 INDOOR INSTALLATIONS MINIMAX NT VENTING GUIDELINES vent terminated at least 24" above any object within 10 ft. More Than10 ft. H Vent Cap Ridge 2 ft. min. 3 ft. min. J 1' min. F K Detail H 1' min. Vent Hood Roof Air Supply E L Jack F Ventilation 4' Chimney G Vent Hood 3' C B Vent for roof penetration installations: D 4' Air Supply 1' min. must extend at least 3 ft. higher than the J Combustion A abov
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17 Section III. Installation OUTDOOR INSTALLATION (Outdoor Shelter Installation in Canada, see page 14) 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
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N L Section III. Installation 18 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 heater is prewired for 240 volt AC connection using the “RED/BROWN” female connector and the “WHITE” common male connector; see below, Figure 16. If you require the heater to be connected to 120 volts AC, remove the “RED/BROWN” fema
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Section III. Installation 19 WIRING SCHEMATIC FOR ALL DUAL VOLTAGE BLOWERS 120 VOLTS AC 240 VOLTS AC WHITE LINE # 1 WHITE LINE # 1 YELLOW YELLOW CAP OFF JOINED ORANGE ORANGE JOINED BLACK BLACK LINE # 2 LINE # 2 PURPLE PURPLE BROWN BROWN CAPACITOR CAPACITOR = = BROWN BROWN NOTE FOR TEST OF THE BLOWER: 1. In reference to the above terms, "CAP OFF" means to no connection. 2. The term "JOINED" means the two wires are connected together and no external connection. Fig
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20 Section III. Installation WIRING DIAGRAM–NT STD & TSI WITH DDTC THERMISTER FAN 24VAC SPA COM { POOL P/N • Réf. 472090 Rev. G • Rév. G 5-27-04 CON-FEM(BL) MiniMax NT TSI/DDTC Wiring Diagram FOR 120 VAC R CON-MAL(W) R/W TERM A Y BK TERM B BLOCK BLOCK BK/W BK G BK G BL W 120 VAC O W HIGH LIMITS 1 W W W W PR N OR THERMAL FUSE 115˚F R W W W BK 240 VAC BK BK BK 2 L GAS VALVE O BK R R BK 3 G W MV G W 150˚F BL BK/W W W MV 4 W CON-FEM(BR) FOR 240 VAC BOND LOG BK (ON THE SIDE J
