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®
MiniMax NT Low NOx Series
POOL & SPA HEATERS
OPERATION & INSTALLATION MANUAL
WARNING
FOR YOUR SAFETY - READ BEFORE OPERATING
Warning: If you do not follow these instructions exactly, a fire or explosion may
result, causing property damage, personal injury or loss of life.
For additional free copies of this manual; call (800) 831-7133.
To
Consumer
Retain For
Future
Reference
U.S. Patent Numbers
5,318,007 - 5,228,618
5,201,307 - 4,595,825
WARNING
Warning: Improper installation, adjustmen
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2 Table of Contents Introduction ............................................................................................................... 3 Important Notices ...................................................................................................................................................................... 3 Code Requirements ....................................................................................................................................................
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3 Introduction MiniMax NT Low NOx Pool and Spa Heaters Congratulations on your purchase of a MiniMax NT Low NOx 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 Low NOx 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 Low NOx, also comes equi
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Operation 4 This instruction manual provides operating WARRANTY INFORMATION instructions, installation and service information The MiniMax NT Low NOx pool heater is sold for the MiniMax NT Low NOx high performance with a limited factory warranty. Specific details are heater. The information in this manual applies to described on the back cover of this manual and a the MiniMax NT Low NOx 200, 250, 300, and copy of the warranty and warranty registration 400 natural gas models. card are included wi
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Operation (Lighting) 5 MINIMAX NT LOW NOx HSI ELECTRONIC IGNITION LIGHTING/OPERATION - NATURAL GAS FOR YOUR SAFETY: READ BEFORE LIGHTING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life and property damage. Do not attempt to light the heater if you suspect a natural gas leak. Lighting the heater can result in a fire or explosion which can cause personal injury, death, and property damage. C. Use only your hand to pus
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6 Installation Instructions SPECIFICATIONS IMPORTANT NOTICE: 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. OUTDOOR VENTILATION 15.50 7.35 2 in. SOCKET 24.05 30.63 3.50 LEG MODEL "A" DIM. 14.50 200 21.63 250 24.63 30
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N L Installation (Electrical) 7 ELECTRICAL, ALL HSI UNITS Electrical Rating 50/60 Hz 120 V.A.C. ONLY NOTE The transformer is pre-wired at the factory for 120 VAC operation ,connect line supply to the line terminal block inside junction box. Use caution in con- necting supply to proper Line (L), Neutral (N), and Ground (GND) terminals; see below, Figure 5. NOTE If any of the original wiring supplied with this heater must be replaced, installer must supply (No. 18 AWG 105° C. U.L. approved A
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Installation (Remotes) 8 TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP Before connecting the remote control system please read the following: 1. First turn the gas valve to the "OFF" position and power up the heater, now using the front buttons on the temperature controller, set the "SPA" and "POOL" temperature to the maximum setting, see Page 24. 2. Now turn the heater to the "OFF" mode by using the "OFF" button on the temperature controller, see Page 24 or by using the main power switch located on the
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Installation (Remotes) 9 TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP, (cont’d.) • Three-wire remote: a) Using 3/16" female quick disconnect connectors, connect the common wire to the "GND" tab of the temperature controller, then connect the two remaining wires to the temperature controller corresponding to the remote control device, pool wire to "POOL" tab, spa wire to "SPA" tab. b) Now return power to the heater. (Note: If you used the main power switch to turn off the heater, now turn the main power
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Installation (Single Voltage Wiring) 10 MiniMax NT Low NOx 400 HSI Electronic Ignition Wiring Diagram (SINGLE VOLTAGE) 1 2 3 4 1 2 3 1 2 3 4 5 6 1 2 P/N 471593 Rev. C 11-1-01 MiniMax NT 400 LOW NOx WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 105 C TEMPERATURE RATING. THERMAL FUSE WIRING MUST BE REPLACED WITH UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 125 C TEMPERATURE RATING.
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Installation (Single Voltage Wiring) 11 MiniMax NT Low NOx 250 HSI Electronic Ignition Wiring Diagram (SINGLE VOLTAGE) 1 2 3 4 1 2 3 1 2 3 4 5 6 1 2 Rev. C 11-1-01 P/N 471593 MiniMax NT 250 LOW NOx WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY EXTERNAL UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 105 C TEMPERATURE RATING. TERMINATE SUPPLY SAFETY GROUND WIRE (GREEN) HERE BOND LUG THERMAL FUSE WIRING MUST BE REPLACED WITH UL OR CSA (IF CANAD
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Installation (Dual Voltage Wiring) 12 MiniMax NT Low NOx (ALL MODELS) HSI Electronic Ignition Wiring Diagram (DUAL VOLTAGE) 1 2 3 4 1 2 3 1 2 3 4 5 6 1 2 PUMP RELAY P/N 471593 Rev. C 11-1-01 MiniMax NT LOW NOx ALL MODELS WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V, 105˚ C TEMPERATURE RATING. THERMAL FUSE WIRING MUST BE REPLACED WITH UL OR CSA (IF CANADA) APPROVED WIRE, 18 GAUGE, 600V,
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Installation (Plumbing) 13 WATER CONNECTIONS Reversible Inlet/Outlet Connection The MiniMax NT Low NOx heater is factory assembled with right side inlet/outlet water connections. The inlet/outlet header can be reversed TO PUMP for left side water connections without removing the POOL POOL FILTER MANUAL HEATER BY-PASS heat exchanger. GATE VALVE CHECK VALVE Reversing Water Connections Figure 9. CHECK VALVE Tools required: FROM POOL 1/4 in. Screw Driver 9/16 in. Socket and Wrench PLUMBING CONNECTIO
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Installation (Gas Line) 14 GAS CONNECTIONS Table 1. Pipe Sized For Length Of Run In Equivalent Feet 1. /2 in.3. /4 in1. in1. ¼ in1. ½ in 2 in GAS LINE INSTALLATIONS NP atLtNP aLtNP aLtNP aLtNP aLtNP a L Model Before installing the gas line, be sure to 200 -'2' 03' 08' 01' 252' 504' 50600 ---- check which gas the heater has been 250 -'1' 02' 05' 07' 01' 502' 505' 00600 --- designed to burn. This is important 300 -- 1' 0'3' 05' 01' 002' 003' 504' 006- 00 - because different types of gas require 40
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15 Installation (Indoor) INDOOR VENTING—General Requirements The vent pipe must be the same size or larger. The MiniMax NT Low NOx 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. Please note the allowable vent runs for each stack pipe diameter are different and can not be exceeded. Note that
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DOOR 16 Installation (Indoor) INDOOR INSTALLATION (USA ONLY) 10 ft. OUTDOOR SHELTER INSTALLATION (CANADA) Vent Cap See page 17 for (Indoor) Vent Adaptors Ridge 2 ft. min. 3 ft. min. All products of combustion and vent gases must be completely removed to the outside atmosphere through Roof a vent pipe which is connected to the stack adaptor. A Jack vent pipe extension of the same size must be connected to the indoor stack adaptor and extended at least 2 feet Chimney higher than highest po
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Installation (Indoor) 17 NOTE b) Construct a non-combustible base from masonry The heater requires two uninterrupted air supply blocks as illustrated, see Figure 14. openings; one for ventilation and one to supply oxygen for proper gas combustion. The air supply BASE FOR USE ON COMBUSTIBLE FLOORS openings should be sized according to Table 2. Air supply requirements below apply to all MiniMax NT Low NOx heaters*. REQUIRED AIR SUPPLY Air for Combustion Air Ventilation Model Sq. In. Sq. In. SHEET
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18 Installation (Indoor) P/N 471593 Rev. C 11-1-01 INDOOR INSTALLATIONS MINIMAX NT LOW NOx VENTING GUIDELINES vent terminated at least 24" above any object within 10 ft. H 10 ft. Vent Cap Ridge 2 ft. min. 3 ft. min. J K 1' min. F Detail H L 1' min. Vent Hood Air Supply E F Ventilation Chimney 4' 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 above grade Vent Hood 7' poin
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Installation (Outdoor) 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 h
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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 m
