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MiniMax NT LN Series
Pool & Spa Heaters
OPERATION & INSTALLATION MANUAL
U.S. Patent Numbers
6,295,980
5,318,007 - 5,228,618
5,201,307 - 4,595,825
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. Installation and service must be
performed by a qualified installer, service agency or the gas supplier.
•
Do not store or use gasoline or other flammable vapors and liquids in the vicinity
of this heater or other appliances.
WHAT TO DO IF YOU SMELL GAS
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use any phone in your building.
•
Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire department.
For additional free copies of this manual; call (800) 831-7133.
WARNING
Pentair Water Pool and Spa, Inc.
1620 Hawkins Ave., Sanford, NC 27330
10951 W. Los Angeles Ave., Moorpark, CA 93021
(919) 566-8000
•
(805) 523-2400
•
1 1
1
To
Consumer
Retain For
Future
Reference
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Table of Contents
Troubleshooting
Related Manuals for Pentair MiniMax NT LN
Summary of Contents for Pentair MiniMax NT LN
- Page 1 If you cannot reach your gas supplier, call the fire department. For additional free copies of this manual; call (800) 831-7133. 1620 Hawkins Ave., Sanford, NC 27330 10951 W. Los Angeles Ave., Moorpark, CA 93021 WARNING Pentair Water Pool and Spa, Inc. (919) 566-8000 • (805) 523-2400 •...
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Page 2: Customer Service
Customer Service Customer Service Technical Support for Pentair Water Pool and Spa, Inc. Sanford, North Carolina Moorpark, California Web site www.pentairpool.com © 2005 Pentair Water Pool and Spa, Inc. All rights reserved. Information in this document is subject to change without notice. -
Page 3: Table Of Contents
Table of Contents Section I. Heater Identification Information ... Section II. Introduction ... Important Notices ... Warranty Information ... Code Requirements ... Consumer Information and Safety ... Section III. Installation ... Specifications ... Plumbing Connections ... Valves ... Manual By-Pass ... Below Pool Installation ... -
Page 4: Section I. Heater Identification Information
ASME: ASME Certified (Bronze Headers) ASHI: ASME Certified Bronze Header and High Altitude Rating HALT: High Altitude Rating HEATER IDENTIFICATION INFORMATION — (HIN) ID DESIGNATOR FOR PENTAIR POOL & SPA HEATERS H. I. N. HEATER IDENTIFICATION NUMBER A S H I... -
Page 5: Section Ii. Introduction
The MiniMax NT LN 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 LN also comes equipped with the Pentair multifunction temperature controller which shows, at a glance, the proper functioning of the heater. -
Page 6: Code Requirements
Section II. Introduction 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;... -
Page 7: Section Iii. Installation
Section III. Installation 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. -
Page 8: Plumbing Connections
VALVE Figure 2. PLUMBING CONNECTIONS The MiniMax NT LN heater has the unique capability of direct schedule 40 PVC plumbing connections. A set of bulkhead fittings is included with the MiniMax NT LN to insure conformity with Pentair’s recommended PVC plumbing procedure. -
Page 9: Water Connections
Section III. Installation WATER CONNECTIONS Reversing Headers — Reversible Inlet/Outlet Connection The MiniMax NT LN Series heater is factory assembled with right side inlet/outlet water connections. The inlet/outlet header can be reversed for left side water connections without removing the heat exchanger. - Page 10 Section III. Installation Reversible Inlet/Outlet Connection, On the MiniMax NT LN Series heater there is insulation installed by the factory on the return head side of the heaters. This insulation is there so that if the heads are reversed in the field, during initial installation of the heater, the high limits will be insulated from the heat radiating from the flue collector.
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Page 11: Gas Connections
Section III. Installation 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 impor- tant 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. -
Page 12: Gas Pipe Sizing
24 inches, they will install a second regulator, which is the second stage. This second stage regulator would be set at the minimum operating pressure for the heater. For “Natural Gas Pentair Pool Heaters” the minimum is 7 inches W.C. -
Page 13: Testing Gas Pressure/Gas Pressure Requirements
Regulator Adjustment Cap 1/8" NPT Plug (Inlet Press) 1/8" NPT Plug (Manifold Press) Figure 4. CAUTION recommended as they cause excessive high gas pressure drops. GAS PRESSURE REQUIREMENTS Inlet Manifold MiniMax NT LN Illustration above is for Natural Gas, see Table 5. -
Page 14: Indoor Venting-General Requirements
INDOOR VENTING — General Requirements The vent pipe must be the same size or larger. The MiniMax NT LN 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. -
Page 15: Indoor (Usa) / Outdoor (Canada) Installations
Section III. Installation INDOOR INSTALLATION OUTDOOR SHELTER INSTALLATION (CANADA) page 16 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 pipe extension of the same size must be connected to the vent adaptor and extended at least 2 feet higher than highest point of the roof within a 10 foot horizontal radius, and at... -
Page 16: Combustion Air Supply
12 inches of the ceiling, the other within 12 inches of the floor. These openings shall directly, or through duct, connect to outdoor air. Pentair Water Pool and Spa, Inc. does not recommend indoor installations that do not provide combustion air from outside the building. -
Page 17: Indoor Installations -Venting Guidelines
Section III. Installation... -
Page 18: Outdoor Installations -Venting Guidelines
Section III. Installation 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. -
Page 19: Electrical Connections
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. • The MiniMax NT LN heater is prewired for 240-volt AC connection using the “RED” connector and the “BEIGE” common connector;... -
Page 20: Wiring Diagram-Nt Ln With Ddtc
Section III. Installation WIRING DIAGRAM–NT LN/W DDTC THERMISTER 24VAC POOL... -
Page 21: Section Iv. Operation
Start pump, make sure the pump is running and is primed, to close the water pressure switch and supply power to heater. Be sure the pool and/or spa is properly filled with water. Follow the Lighting/Operating instructions below. MINIMAX NT LN HSI ELECTRONIC IGNITION LIGHTING/OPERATION FOR YOUR SAFETY: READ BEFORE LIGHTING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. -
Page 22: Safety Controls
LOW GAS PRESSURE SWITCH The MiniMax NT LN model heater uses a low gas supply pressure switch, (see Figure 23), ahead of the gas valve, to... -
Page 23: Safety Controls
Section IV. Operation SAFETY CONTROLS, (cont’d.) HIGH LIMITS A “High Limit”, is a safety device that opens the electrical circuit and shuts off the heater based on a water temperature set point within the “High Limit Device”. The MiniMax NT LN series of heaters contains two (2) high limit devices which are located on the main inlet / outlet header, one sensing the inlet water temperature and one sensing the outlet water... -
Page 24: Digital Display Temperature Controller (Ddtc)
Section IV. Operation DIGITAL DISPLAY TEMPERATURE CONTROLLER (DDTC) POWER PRESSURE SW SYSTEM THERMOSTAT INDICATOR LIGHTS HEATING SERVICE Figure 26. The DDTC board, shown in Figure or both to a minimum temperature of 65° F. (below 65° F. display reads "Off") and a maximum of 104° F. The DDTC board also functions as a system status indicator, using LED lights and programmed error codes. - Page 25 Section IV. Operation Figure 27.
- Page 26 SET UP The MiniMax NT LN Heater comes from the factory preset with a pool temperature setting of 78° F. and a preset spa temperature of 100° F., and in the off mode setting. Once the power is turned on, the DDTC board will do a self diagnostic internal check, during this time the display will first read “888”, then the...
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Page 27: Remote Control
Section IV. Operation • HEATING The heating light is on any time the thermostat has signaled a call for heat which initializes the ignition safety circuit — the light comes on indicating successful firing of the main burners and stays on until the pool/spa reach the water temperature setting. -
Page 28: Section V. Troubleshooting
NOTE: If Code ERR is shown on the LED display at any time, turn the heater off, (from power switch), then turn on the heater again. If the error code is still displayed, call a certified Pentair Service Technician for repair. -
Page 29: Troubleshooting (General)
Section V. Troubleshooting TROUBLESHOOTING (GENERAL) Possible Cause Heater will not come on Automatic ignition system fails Pump not running Pump air locked Filter dirty Pump strainer clogged Defective wiring or connection Defective pressure switch Defective gas controls On-Off switch in "OFF" position Heater Short Cycling (Rapid On and Off Operation) Insufficient water flow Defective wiring... -
Page 30: Section Vi. Maintenance
THE HOLE TO INSTALL A PRV, OTHERWISE, YOU WILL DRILL INTO THE VALVE ASSEMBLY. PRESSURE RELIEF VALVE In some installations, a pressure relief valve (PRV) is required on the MiniMax NT LN Series. To install a PRV, remove the access doors, remove Flow Valve... -
Page 31: Spring, Fall And Winter Operation
The MiniMax NT LN should not be operated outdoors at temperatures below 0° F. for propane and -20° F. for natural gas. Where freezing is possible, it is necessary to drain the water from the heater. -
Page 32: Chemical Balance
Section VI. Maintenance CHEMICAL BALANCE POOL AND SPA WATER Your Pentair Pool Products pool heater was designed specifically for your spa or pool and will give you many years of trouble-free service, provided you keep your water chemistry in proper condition. -
Page 33: Replacement Parts - Nt Lnw/Ddtc
REPLACEMENT PARTS — NT LN w/DDTC... - Page 34 Replacement Parts—NT LN Item Description Quantity Note: Parts for ASME and high altitude (above 2000') are not listed above, please contact our Customer Service Department for details.
- Page 35 NOTES...
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Page 36: Nt /Guide D'installation Et De Fonctionnement
36 40 SAVE THESE INSTRUCTIONS Pentair Water Pool and Spa, Inc. 1620 Hawkins Ave., Sanford, NC 27330 (919) 566-8000 • 10951 W. Los Angeles Ave., Moorpark, CA 93021 (805) 523-2400 •...