Trane Gas Unit Heaters カタログ

10

 UH-PRC002-EN

distribution over a large floor area. (Five-way nozzles are not available on propeller fan unit 
heaters.)

Gas fired indoor units require venting to remove the products of combustion. To help assure safe, 
trouble-free operation, follow the guidelines listed below:

  

Units with a factory installed flue vent fan.

1.

All units must be vented. Power vented units are designed to use single wallvent pipe. A 
Breidert Type L, Field Starkap, or equivalent unit vent cap must be furnished by the customer.

2. The venting system for these appliances shall terminate at least 4 feet below, 4 feet horizontally 

from, or 1 foot above any door, window or gravity air inlet into any building.

3. Through-the-wall vents for these appliances shall not terminate over public walkways or over 

an area where condensate or vapor could create a nuisance or hazard or could be detrimental 
to the operation of regulators, relief valves, or other equipment.

4. The vent pipe diameter must be as shown under “Recommended Flue Size” in the specification 

charts. An adaptor must be field supplied if required.

5. Each furnace must have an individual vent pipe and vent terminal. Vent pipe equivalent 

length must not exceed 50 feet. Equivalent length is the total length of straight sections, plus 
15 feet for each 90° elbow and 8 feet for each 45° elbow.

6. Maintain 6 inch clearance between vent pipe and combustible materials. Vent terminal must be 

installed with a minimum clearance of 4 feet from electric meters, gas meters, regulators, and 
relief equipment.

7.

Seal vent pipe joints to prevent leakage. Use General Electric RTV-108 or Dow Corning RTV-732 
Silicone Sealant or 3M #425 aluminum foil tape.

8. Pitch horizontal pipes downward 1/4-inch per foot toward outlet for condensate drainage. 

Horizontal portions of the venting system shall be supported at maximum intervals of 4 feet to 
prevent sagging.

9. Vertical vent pipes should be equipped with condensate drains.

10. Insulate single wall vent pipe exposed to cold air or running through unheated areas.

IRI, which stands for Industrial Risk Insurers, and FM, which stands for Factory Mutual, are both 
basically insurance companies which insure commercial/industrial firms against a variety of 
losses. Both publish requirements which must be met by certain equipment operating in the 
facilities they are preparing to insure.

Listed below is our interpretation of the requirements of both insurers pertaining to heating units 
only to the extent of features/controls required by IRI and/or FM. There are a number of additional 
requirements which pertain to electrical service, details of installation, etc., and we urge you to 
obtain copies of the publications pertaining to these details if you are involved in a job where IRI 
or FM adherence has been indicated. The requirements detailed herein are our interpretations of 
the latest publications in our possession and we must disclaim any responsibility for errors due to 
our interpretation and/or lack of any updated revision of these standards. Our intent is to provide 
you with an understanding of the application of these standards and how we believe our indirect-
fired gas heating equipment applies.

1.

All input sizes require 100 percent shutoff. This requires that any natural gas unit, equipped with 
intermittent pilot ignition, must employ a “lock out” type ignition system which will shut off 
pilot gas if the pilot fails to light at any time. This system is required by AGA on LP gas units