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

 

 
NOTE: 

If this furnace replaces an appliance with a vent that was originally installed in a common vent system serving other 

appliances, the vent system is likely now too large to properly vent the remaining appliances only and must be modified 
accordingly. Refer to Natural Fuel Gas Code Appendix G Category I vent tables for common venting a PG Series furnace 
and another fan assisted or natural draft unit. 
 
In order too common vent a PG Series furnace with a natural draft gas fired hot water heater; follow the recommendation of 
the NFGC Category I venting tables. 
If the NFGC venting tables do not apply to a specific common venting system then refer to the section on replacing an 
existing furnace from a common vent in Section G of this manual. 
 

NOTICE:  

Thermo Pride power gas units may be sidewall vented with a power sidewall venting system that is appropriate 

for the application and certified by a nationally recognized testing agency for use with gas fired warm air central furnaces. 
 
 

NOTICE:

  An agency approved gas barometric control or draft diverter 

must

 be installed. The draft control device must 

also meet the approval of the local authorities. See the draft control manufacturers instructions for installation.

 
 
E. VENT DAMPERS 
 

If a vent damper is installed, it must be certified by a nationally recognized testing agency. It must be an electro-
mechanical type that opens completely before gas flows to the main burner and closes only after the gas valve has 
shut off gas flow to the main burner. 

 
WARNING:

 The PG Series furnaces must not be installed with a manual or thermally actuated vent damper. 

 
 
F. CONDENSING IN THE CHIMNEY: 
 

Due to the increasing efficiencies of our furnaces, more heat is being placed into the home instead of up the chimney. 
This means that the stack temperature will be lowered which may result in condensing within the chimney under 
certain conditions. The following is an explanation on why and what to do if condensing occurs.  
 
Moisture occurs in flue gases when hydrogen is mixed with oxygen from the chemical reaction produced by 
combustion. This mixture of hydrogen and oxygen produces water molecules. 
 
The flue gas vapor may do one of two things as it escapes up the chimney: 
 
1. Remain in a vapor state if the internal chimney wall temperature is above the dew point, or 
 
2. Condense on the chimney walls if they are chilled below the dew point. 
 
Condensing will always occur on chimney walls whose temperatures are below the dew point, but will evaporate 
once the walls are warmer than the dew point. If the chimney walls do not reach the dew point during the cycle of the 
furnace, the moisture may accumulate in large enough quantities to cause problems such as corrosion of the chimney 
or corrosion of the heat exchanger. 
 
This condensation most likely will not occur at the bottom of the chimney, because the flue gas is heating the 
chimney walls as it rises and the bottom will be heated first. This heating of the walls will cause the flue gas 
temperature to drop, which in turn may reduce the wall temperature below the dew point causing condensation to 
appear on the upper part of the chimney first. This condensation may drip back as far as the flue pipe and heat 
exchanger, where corrosion may occur if not treated. 
 
To prevent condensation, it is necessary that the internal chimney wall temperature always be kept above the dew 
point. The chimney may have to be lined with a flue liner if the temperature loss is too great for the furnace. A liner 
will act as an insulator and reduce the flue gas temperature loss. Insulation may be added around the liner for further 

Summary of Contents for PGL20-180

Page 1: ...DO NOT TRY TO LIGHT ANY APPLIANCE DO NOT TOUCH ANY ELECTRICAL SWITCH DO NOT USE ANY PHONE IN YOUR BUILDING LEAVE THE BUILDING IMMEDIATELY IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR S PHONE FO...

Page 2: ...OMMON VENT 8 H GENERAL GAS PIPING 8 I INSTALLATION OF NATURAL GAS PIPING 9 J INSTALLATION OF LP GAS PIPING 10 K BURNER INSTALLATION 11 L REQUIREMENTS AND SIZING OF DUCTWORK 15 M FILTERS 18 a PGT HORIZ...

Page 3: ...ust be performed by qualified service personnel 1 This page contains reproductions of the various warning and instruction labels placed on the Thermo Pride Power Gas Furnaces Please read and comply wi...

Page 4: ...llest appliances must be vented into the top opening WARNING A Category 1 appliance must never be connected to a chimney that is servicing a solid fuel appliance If a fireplace chimney lined with a me...

Page 5: ...ace 1 All local codes and or regulations take precedence over the instructions in this manual and should be followed accordingly In the absence of local codes installation must conform to these instru...

Page 6: ...he floor Also the furnace must be located or protected to avoid physical damage by vehicles The furnace must be located on a dry surface If the surface becomes wet or damp at times the furnace should...

Page 7: ...ries make up air control This control installs quickly and easily on any warm air heating system and delivers controlled fresh air automatically during the winter and summer This type control helps so...

Page 8: ...for the design and weight of the material used to maintain clearances and to prevent physical damage 9 Vent connectors used in connecting the furnace to the vent cannot be channeled through floors ce...

Page 9: ...fficiencies of our furnaces more heat is being placed into the home instead of up the chimney This means that the stack temperature will be lowered which may result in condensing within the chimney un...

Page 10: ...ilding 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 Turn on clothes dryers an...

Page 11: ...meter Failure to install a drip leg may void the limited warranty on the furnace NOTE All gas piping must be leak tested using a soap and water solution if the gas is turned on following the procedur...

Page 12: ...lings only Avoid the use of reducing bushings Remove all burrs and inspect the pipe for dirt or other foreign material prior to connecting Maximum supply pressure for natural gas is 14 wc and minimum...

Page 13: ...and fittings except tin lined shall not be used if the gas contains more than a trace 0 3 grains per 100 cubic ft of hydrogen sulfide gas Maximum supply pressure for liquified petroleum LP gas is 14...

Page 14: ...NOT PACK THE INSULATION DOWN The loose fill insulation should be placed in such a fashion that the surface of the insulation is sloped from the top of the combustion chamber to the top of the lower m...

Page 15: ...he bottom burner mounting stud must be removed before mounting the burner Also the fan limit and its mounting bracket must be properly positioned once the unit is in place See section N on fan limit p...

Page 16: ...O2 or O2 combustion analyzer is required when setting combustion A carbon monoxide detector capable of measuring flue gas down to 50 PPM of CO is also required After the unit has operated a minimum of...

Page 17: ...n air duct system must equal the supply air duct system in its CFM capabilities Use a supplier s catalog for proper sizing of outlet and return air registers and grills to ensure that they meet the CF...

Page 18: ...necessary air handling capacity of a duct system each of the system components trunk lines take offs runs and register and grill free areas must be properly sized and matched together A 12 x8 duct wit...

Page 19: ...style is available for the horizontal air flow application on the PGT5 11 16 furnaces See Fig below To obtain proper CFM with air conditioning installed on a belt drive unit the motor and or blower pu...

Page 20: ...oning coil is installed the speed of the blower motor may have to be changed This depends on the static resistance of an individual duct system and the size of the air conditioner M FILTERS To clean a...

Page 21: ...in the vestibule Should the installer prefer to mount the fan and limit control in the supply plenum the installer must supply additional wire comparable to the original wire size and type which must...

Page 22: ...to change blower speed wiring WARNING The power gas burner has its own transformer and no other electrical equipment should be operated from this transformer If an electric vent damper is used a sepa...

Page 23: ...e installed in strict accordance with local ordinances and codes In the absence of local ordinances and codes all electrical wiring must be in accordance with the National Electrical Code ANSI NFPA 70...

Page 24: ...All installations and services must be performed by qualified service personnel 22...

Page 25: ...All installations and services must be performed by qualified service personnel 23...

Page 26: ...All installations and services must be performed by qualified service personnel 24...

Page 27: ...All installations and services must be performed by qualified service personnel 25...

Page 28: ...installed in strict accordance with local ordinances and codes In the absence of local ordinances and codes all electrical wiring must be in accordance with the National Electrical Code ANSI NFPA 70...

Page 29: ...mains running at conditions 1 2 for 30 minutes or until the odor has dissipated B BURNER COMBUSTION Obtain the following recommended values when setting the burner combustion CO2 NATURAL GAS MIN 8 5 M...

Page 30: ...14 WC pressure on natural gas and 11 0 to 14 0 WC on LP gases The pressure to the furnace must be checked while the furnace burner and any other gas appliances on the same supply system are operating...

Page 31: ...checked With furnace in normal heating operation check to make certain blower will start and stop automatically under control of fan switch a Check safety limit control as follows 1 Shut off incoming...

Page 32: ...urn off all power to the unit Next remove the access panel see below and following page immediately above the burner on the horizontal furnace it will be located to the side of the burner to gain entr...

Page 33: ...trol as close to the chimney as possible Also face the draft control towards the open area of the room 4 Alter manifold pressure of the burner but stay within normal operating pressures as specified b...

Page 34: ...All installations and services must be performed by qualified service personnel 32 VII REPLACEMENT PARTS...

Page 35: ...All installations and services must be performed by qualified service personnel 33...

Page 36: ...All installations and services must be performed by qualified service personnel 34...

Page 37: ...All installations and services must be performed by qualified service personnel 35...

Page 38: ...All installations and services must be performed by qualified service personnel 36...

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