Pentair 300, 250 installation manual Indoor VENTING-General Requirements, Installation Indoor

Page 15

Installation (Indoor)

15

 

 

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 each 90-degree elbow reduces the maximum horizontal vent run by 8 feet and each 45-degree elbow in the vent run reduces the maximum vent run by 4 feet. See the tables below for the maximum vent lengths using a 90-degree and 45-degree elbows. The MiniMax NT Low NOx induced-draft pool and spa heater uses positive pressure to push flue gases through the vent pipe to the outside. This requires a completely sealed vent system—single wall vent pipe with sealed-seams and joints may be used. Flue gases under positive pressure may escape into the dwelling with any cracks or loose joints in the vent pipe, or improper vent installation. The vent pipe must be of a sealed-seam construction such as those listed for use with category III appliances. Alternately, single wall or double-wall type B duct which has had duct seams and joints permanently sealed using cements or other suitable means which are rated for use at the flue gas temperatures of 325° F. and are permanent are acceptable. The use of listed thimbles, roof jacks and/or side vent terminals are required; and the proper clearances to combustible materials must be maintained in accordance with type of vent pipe employed— in the absence of a clearance recommendation by the vent pipe manufacturer, the requirements of the Uniform Mechanical Code should be met. The ventilation air requirements for the MiniMax NT Low NOx heater and can be found on page 17. It is recommended that vent runs over 18 feet be insulated to reduce condensation related problems and/or the use of a condensate trap in the vent run close to the heater may be necessary in certain installations such as cold climates. The MiniMax NT Low NOx is suitable for through-the-wall venting.

Recommended sources for Side-wall vent hood terminals include: The Field Controls Co. (2308 Airport Road, Kingston, NC 28501, (800)742-8368) and Tjernlund Products Inc. (1601 Ninth Street, White Bear Lake, MN 55110, (800) 255-4208)—consult manufacturer for model information and availability.

CAUTION

Do NOT combine exhaust vent pipes to a common exhaust vent in multiple unit installations. Run separate vent pipes.

45 ft. Maximum Vent Run, 5 in. O.D. vent (Equiv. ft.)

 

Additional 90° elbows

Additional 45° elbows

 

after first elbow

after first elbow

 

 

 

 

Quantity

Reduced Max.

Quantity

Reduced Max.

 

 

 

 

1 (2 total)

37

(2 total)

41

 

 

 

 

 

2

(3 total)

29

(3 total)

37

 

 

 

 

 

3

(4 total)

21

(4 total)

33

 

 

 

 

 

22 ft. Maximum Vent Run, 4 in. O.D. vent (Equiv. ft.)

 

Additional 90° elbows

Additional 45° elbows

 

after first elbow

after first elbow

 

 

 

 

 

Quantity

Reduced Max.

Quantity

Reduced Max.

 

 

 

 

 

1 (2 total)

14 ft.

(2 total)

18

ft.

 

 

 

 

 

 

2

(3 total)

(3 total)

14

ft.

 

 

 

 

 

3

(4 total)

(4 total)

 

 

 

 

 

 

Rev. C 11-1-01

P/N 471593

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Contents For additional free copies of this manual call 800 MiniMax NT Low NOx SeriesTable of Contents Code Requirements MiniMax NT Low NOxWarranty Information Safety RulesOperation Operation Lighting For Your Safety Read Before LightingSpecifications Installation InstructionsELECTRICAL, ALL HSI Units Installation ElectricalTWO-WIRE or THREE-WIRE Remote HOOK-UP Wire RemoteInstallation Remotes Three-wire remote Wiring Installation Single VoltageVoltage Installation SingleMiniMax NTLow Code or Superceding Local Wiring CodesWater Connections PlumbingPlumbing Connections GAS Connections Indoor VENTING-General Requirements Installation IndoorSee page 17 for Indoor Vent Adaptors Indoor Vent Adaptors Fits ALL Models Indoor InstallationVentilation Installation OutdoorGeneral Description Basic System OperationBasic Operation Typical Water Pressure Switch Safety ControlsAIR Pressure FAN Switch Water Pressure SwitchOperation of Ignition Module Normal Operation no Remote Pentair Temperature Controller 7800 LayoutGeneral Basic Thermostat OperationTo Change the Factory Temperature Settings Time SettingTemperature & Time Setting Programming Time Setting Programming Time SETTING, cont’dSpring and Fall Operation Maintenance InstructionsMaintenance Energy Saving TipsIf pH becomes too high over alkaline, it has these effects Maintenance Water TreatmentChemical Balance Pool and SPA WaterNormal Operation Sequence Troubleshooting-Normal Operation Sequence of HeaterPower Service Current Temp SET TEMP/TIME Troubleshooting-Normal Operation of HeaterTroubleshooting & Service Service CHECKS-IGNITION Module Service ChecksFlame Sensor Current Check Heater Short Cycling Rapid On and Off Operation Troubleshooting GeneralMinimax NT LOW NOx Heater Single Voltage Description QTY Minimax NT LOW NOx Heater Dual Voltage MiniMax NT Low NOx Dual Voltage Replacement parts Rev. C Rev. C Rev. C MiniMax NT Low NOx Heaters Limited Warranty