Thermo Products MDA1-100N, MDA1-50N, MHA1-75N Horizontal Size and Lengths for Horizontal Vents

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All installations and services must be performed by qualified service personnel.

Installation, setup, and operation must be in accordance with the instruction provided by the manufacture of the power venter. Thermo Products has provided in the following section maximum and minimum vent lengths guidelines that must also be followed.

Contact Field Controls for instructions for installing the SWGII vent system

IMPORTANT: No warranty will be made on behalf of the appliance manufacturer with respect to the sidewall venting system installation or replacement. The appliance manufacturer shall not be liable for any special, incidental, indirect, or consequential damages. (Some jurisdictions do not allow exclusion or limitation of incidental or consequential damages. The above limitations or exclusions may not apply to you).

IMPORTANT: It is the installer’s responsibility to inform and demonstrate to the user the correct operation and maintenance of the appliances explained in this manual, the user’s information manual, and the sidewall vent manufacturer’s manual.

1. Horizontal Size and Lengths for Horizontal Vents

The minimum sidewall vent length is two (2) feet of straight vent pipe with one (1) elbow and one (1) adapter or transition to inducer. The maximum vent length and permitted number of elbows are shown in the following table.

Table 3: Horizontal Size and Length for Sidewall Venting

MODEL NUMBER

SIZE

Max. Length of Vent

EQUIVALENT

OF

Pipe (in Feet) With

LENGTH

OF FURNACE

VENT

1

2

3

OF VENT*

 

(In.)

ELBOW

ELBOWS

ELBOWS

(Ft)

MHA1/MDA1-50

3

45

40

35

50

 

 

 

 

 

 

MHA1/MDA1-75

 

 

 

 

 

MHA1/MDA1-100

4

45

40

35

50

MHA1/MDA1-125

 

 

 

 

 

* Each elbow used is considered to be equivalent to 5 feet of straight vent pipe.

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Contents Induced Draft Highboy COUNTERFLOW/HORIZONTAL GAS Furnace Section Safety II. Installation Guidelines Page Shipping Damage PackagingSafety Codes II. Installation GuidelinesCloset and Alcove Installation Installation LocationPlenum Flue or Vent All Models Covered by This Manual Standard ClearancesRefer to Figure Non-combustible MaterialAir for Combustion and Ventilation MDA1 Horizontal Installation MDA1 Installed Horizontal Duct Work and Air Conditioning Filters/ Filter InstallationOptional Thermo Pride Filter Rack Use of Non-Thermo Pride Filter Retention MeansFormula FPMVenting Carbon Monoxide Poisoning Hazard Replacing An Existing Furnace From a Common VentCondensing in the Chimney Page Page Vent Connection to Inducer Inducer Mounting Automated Literature FAX Sidewall VentingHorizontal Size and Length for Sidewall Venting Horizontal Size and Lengths for Horizontal VentsGeneral GAS Piping Fire or Explosion Hazard GAS PipingPage Typical Gas Piping Installation of Natural GAS PipingSteel Pipe Size for Natural Gas IPS Installation of Propane GAS PipingPage Electrical Field Wiring and Replacing WiringRoom Thermostat Electronic Air Cleaner and Humidifier ConnectionsBlower and Control Panel Initial Startup To delay fan Set SwitchWhat to do if YOU Smell GAS To Turn Off Gas To Appliance Adjustment Of Heat Input Rate Page Burner Adjustment Typical Observation of Main Burner Flames Setting Supply Air Temperature RiseImportant Remove flue blockage when done Checkout ProcedureLED will also flash once at power-up Diagnostic FeaturesGeneral Inspection Shut off gas and disconnect power before continuingHouse Air Blower Return Air Filter Filter Maintenance ProcedureFilter Replacement VI. Installers Instructions to User Appendix a Sources for Reference Standards Sequence of Operations for Heating System Appendix B Sequence of OperationsMode of Operation Control System Action Heating System Appendix C Troubleshooting FlowchartsYes Is ignitor positioned Correctly? Does system run until thermostat is satisfied? Description Part Number QTY MDA1/MHA1-50S00S4426Appendix E Replacement Parts List MHA1 Page Replacement Parts List MDA1 Page Appendix F Wiring Diagram Page MID-EFFICIENCY Highboy GAS Furnace SPECIFICATIONS5 Appendix G MID-EFFICENCY Furnace SpecificationsNominal temp. rise Heating fan speed