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2.6 Combustion Air Requirements 

1. If the duct furnace is installed in furnace rooms, confined areas or low-leakage 

construction buildings, provisions must be made for combustion air. The duct furnace 
shall be located such that a negative pressure will not be created, which will starve the 
burner of combustion air. The combustion air vent piping should not be less than 24 Ga. 
galvanized steel, and not more than 50 feet nor less than 10 feet in length. 

2.  NOTE:  Outdoor Combustion Air Kits should be used where there is a possibility of 

exposure to substances such as: 

Chlorinated laundry products 

 

Carbon tetrachloride 

Permanent wave solutions  

 

Halogen-type refrigerants 

Chlorinated waxes and cleaners   

Cleaning solvents (perchloroethylene) 

Chlorine based pool chemicals 

 

Printing inks, paint removers, etc. 

Water softening chemicals  

 

Cements and glues 

De-icing salts or chemicals  

 

Anti-static fabric softeners 

Masonry acid washing materials   

Hydrochloric acid 

3.  NOTE:  The above also applies to the circulating air intake. Use 100% external  air. 

4.  Combustion air shall be provided at a rate of at least 10 CFM, or 1 square inch of free 

opening, per hour of rated input. If a separate mechanical means provides this air, an 
interlock with the combustion blower shall be provided. 

5.  In some cases, local authorities require that combustion air be ducted directly to the 

burner.  Refer to the relevant standards in the current CAN1-B149.1, CAN1-B149.2, 
B139 and Z223.1 in USA. 

2.7 Exhaust Stack and Venting 

1. Installations must be in accordance with the requirements of authorities having 

jurisdiction.  Flue outlet pressure must not exceed rating on the name plate for 
maximum over fire pressure on positive fired chambers, or maintain the over fire draft 
pressure for the furnace on negative fired chambers with I.D. fans. 

2.  A vent connector shall be equivalent to a minimum of 24 Ga. galvanized steel.  It shall 

have a minimum clearance of at least 9" to combustible material.  All horizontal runs 
should have a minimum rise of 1/4" per foot of horizontal run in the direction of 
discharge. 

3.  Refer to the rating plate for the category of appliance to select the venting.  Consult the 

authorities having jurisdiction, and use a gastight, watertight venting system constructed 
of material resistant to corrosion by condensate.  

4.  The National Fuel Gas Code, ANSI Z223.1, specifies a 4 foot (1.22m) horizontal vent 

terminal clearance from gas and electric meters, regulators and relief equipment. The 
Canadian B149.1, Natural Gas Installation Code specifies a 6 foot (1.83m) horizontal 
vent terminal clearance to gas and electric meters and relief devices. 

5.  Do not install dampers or other restrictive devices in the flue vent pipe. 

6.  Stack terminations must be kept to approved distances from fresh air intakes, rooflines, 

etc.  Guy wires may be required to brace the stack above rooflines.  

Summary of Contents for IFD SERIES

Page 1: ...If you smell gas 1 Open windows 2 Do not touch electrical switches 3 Extinguish any open flame 4 Immediately call you gas supplier WARNING Improper installation adjustment alteration service or maintenance can cause injury or death Read the installation operating and maintenance instruction thoroughly before installing or servicing this equipment This duct furnace must only be serviced by qualifie...

Page 2: ... 2 7 Exhaust Stack and Venting 8 2 8 Gas Installation 9 2 9 Electrical Installation 10 3 0 OPERATING INSTRUCTIONS 11 3 1 Start Up Check List 11 3 2 Combustion Operation 12 3 3 High Altitude Operation 13 3 4 Shut Down Instructions 14 3 5 Suggested Tools 14 3 6 Troubleshooting Guide 15 3 7 Final Checks And Adjustments 17 4 0 MAINTENANCE 18 4 1 Recommended Maintenance 18 5 0 4 2 Recommended Spare Par...

Page 3: ...ove information from this instruction manual Leave this instruction in the electrical enclosure of the duct furnace 3 Field installed fuel conversion kits are not available If your fuel requirements change contact the factory about converting your furnace to from natural or LP gas 1 2 Caution 1 Regulations require that service mechanics that work on combustion equipment must be qualified 2 Contact...

Page 4: ...d 3 The duct furnace is allowed to operate during building construction period 4 The duct furnace is installed without proper clearance to combustible materials or located in a confined space without proper ventilation for combustion See section 2 0 Installation 5 The duct furnace is operated in atmospheres containing flammable vapors chlorinated or halogenated hydrocarbons 6 The temperature rise ...

Page 5: ...se are continuously in use 2 1 Receiving and Storing 1 INSPECT the duct furnace carefully upon arrival for any shipping damage If damaged sign the carrier s bill of lading with a notation Damaged During Shipment or Received Damaged 2 Check the packing slip against all items received If any items are missing sign the carrier s bill of lading with the notation Shipment Received Less Item 3 When unlo...

Page 6: ...removed before lifting the duct furnace into place 6 If a fork lift truck is used caution must be taken to ensure that the forks do not damage the duct furnace or its components The forks must extend beyond the opposite side of the duct furnace to prevent damage 7 Check that there are or will be no explosive flammable or toxic vapors or abnormally excessive dust in the area where the duct furnace ...

Page 7: ...hanger and other components 6 If installing a duct furnace model IFD the furnace is connected to a return air duct or any other inlet air restriction the duct furnace shall be installed on the positive pressure side of the air circulating blower 7 When the duct furnace is installed in an enclosed duct furnace room it is imperative that the duct furnace room itself is not used as an air plenum Duct...

Page 8: ...air be ducted directly to the burner Refer to the relevant standards in the current CAN1 B149 1 CAN1 B149 2 B139 and Z223 1 in USA 2 7 Exhaust Stack and Venting 1 Installations must be in accordance with the requirements of authorities having jurisdiction Flue outlet pressure must not exceed rating on the name plate for maximum over fire pressure on positive fired chambers or maintain the over fir...

Page 9: ...ping to duct furnace and labeled for quick identification Color coding of pipe may be required and is recommended Carefully check the duct furnace rating plate for the fuel type supply pressure and input rating 2 Gas supply pressure higher than 14 w c 3 5kPa requires an additional field installed gas regulator Install the high pressure gas regulator and relief valve if supplied in the gas line to ...

Page 10: ...sumed to be the maximum load 2 Reconnect all disconnected wiring on the duct furnaces that were split for shipment 3 When connecting a power supply to a three phase motor take care that the three phase wiring gives you the correct motor and blower rotation on all motors 4 Should any original wire supplied with the furnace have to be replaced it must be replaced with wiring material having a temper...

Page 11: ...connect switch to OFF position 2 Close all duct furnace manual valves and field piping valves 3 Check the duct furnace supply discharge and vent to make sure they are clear and free from any obstructions Check to make sure all applicable dampers are open or adjusted to their correct settings 4 Purge all the air from the gas lines per gas codes Check all connections for leaks and correctness Ensure...

Page 12: ...ting up the duct furnace for the first time or if the duct furnace has been shut down for an extended period of time the same start up procedures as outlined in sections 3 2 and 3 3 should be followed 1 Refer to burner manufacturer s Installation Operation and Maintenance Instructions for proper set up operation and settings Turn on the main and pilot if applicable manual shutoff valves upstream o...

Page 13: ...gas control valve Check the nameplate for the correct pressure and adjust the appliance regulator if necessary b Check the CO and O2 reading at maximum and minimum inputs shown on the rating label O2 readings typically range from 4 10 CO readings should not exceed 400 PPM at any time Adjust the air gas ratios with the control linkages making fine adjustments before measuring again c Ensure proper ...

Page 14: ... automatically running the blower until the air reaches a cool enough temperature 4 Turn the duct furnace control to the OFF position 5 Set the main power disconnect to the duct furnace to the OFF position 6 Close the Main Manual Shut Off Valve if the burner is shut down for an extended period of time to prevent gas leaking into the combustion chamber 7 If the duct furnace is to remain idle for an...

Page 15: ...rrect rotation and or adjustment of switch C Flame safeguard relay goes into safety shutdown Lockout 1 See technical data sheets on flame safeguard relay 1 Determine the cause of lockout Reset the flame safeguard relay D Pilot does not light after pre purge has timed out and voltage is present on flame safeguard output terminals 1 Manual pilot shut off valve closed if applicable 2 Inlet gas pressu...

Page 16: ... inlet pressure 3 No gas on outlet side of butterfly valve or actuator with proper inlet pressure 4 Burner does modulate 1 Turn heat off on switch to the off position Slowly open all manual gas shut off valves 2 Clear obstruction in vent orifice or line Check for correct size spring Replace if defective 3 Check wiring voltage and adjustment Correct wiring or replace if defective 4 Check wiring and...

Page 17: ... manual gas valve before burner Operate unit in heat mode After pilot flame has been established close manual pilot gas valve if applicable The flame safeguard must trip out within 15 seconds Gas Pressure Switches The low gas pressure switch will trip out and must be reset before resuming operation when the inlet gas shut off valve is turned off or inlet gas pressure is lower than the trip point T...

Page 18: ...ld pressure Check and clean the vent screen if necessary Refer to burner manufacturer s IOM for servicing the burner 3 Controls Clean and recalibrate all controls and check for proper operation Repair or replace any controls found faulty Check all damper controls and balancing points for fresh air requirements tighten any linkages 4 Motor Lubrication Refer to motor manufacturer for lubrication rec...

Page 19: ...ber for carbon deposits soot scale or rust Clean if necessary If there is evidence of flame impingement a complete burner adjustment must be made Follow section 3 0 for all details referring to burner operation and start up 6 General Check for any vibration or unusual noise If any are observed locate the cause and correct Check the condensation lines for any blockages or leaks Check all piping and...

Page 20: ...20 5 0 SPECIFICATIONS The attached literature pertains to the specific duct furnace details ...

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