Thermo Products Thermo Pride Furnace MHA1-75N User's Manual | Page 17

Thermo Products Furnace User's Manual - Thermo Pride Furnace MHA1-75N.
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All installations and services must be performed by qualified service personnel. 
 

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restriction, leakage, corrosion or other deficiencies which could cause 
an unsafe condition. 

 

3.  Insofar as is practical, close all building doors and windows and all 

doors between the space in which the appliances remaining connected 
to the common venting system are located and other spaces of the 
building. 

 

4. Turn on clothes dryers and any appliance not connected to the 

common venting system. Turn on any exhaust fans, such as range 
hoods and bathroom exhausts, so they will operate at maximum 
speed. Do not operate a summer exhaust fan. 

 

5.  Close fireplace dampers. 

 

6.  Follow the lighting instructions. Place the appliance being inspected in 

operation. Adjust thermostat so appliance will operate continuously. 

 

7.  Test draft hood equipped appliances for spillage of flue gases at the 

draft hood relief opening after 5 minutes of main burner operation. Use 
the flame of a match or use a draft gauge. 

 

8.  If the improper venting is observed on any of the appliances during the 

above testing, the common vent system must be corrected. Follow the 
steps outlined in the National Fuel Gas Code, NFPA 54/ANSI Z223.1 - 
2002 or the latest edition thereof, to resize the vent system to 
approach the minimum size using the appropriate tables in the 
appendix of the Code.  

 

9. Return doors, windows, exhaust fans, fireplace dampers and the 

remaining appliances to their previous conditions of use after 
determining that each appliance remaining connected to the common 
venting system is venting properly when tested as outlined above and 
the vent system is properly sized. 

 

NOTICE:  Common vent sizing of two Category I appliances may be done as 
referenced in the National Fuel Gas Code, NFPA 54/ANSI Z223.1 - 2002 or the 
latest edition thereof. 
 

 

 

 

3. Condensing in the Chimney 

 

Due to the improved designs, resulting in increasing thermal efficiencies of our 
furnaces, more heat is being placed into the home instead of up the chimney. 
This means the stack temperature will be lowered, which may result in 

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