CIRCULATING AIR AND FILTERS
PROPANE GAS TANKS AND PIPING
WARNING
IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK.
•SINCE PROPANE GAS IS HEAVIER THAN AIR, ANY LEAKING GAS CAN SETTLE IN ANY LOW AREAS OR CONFINED SPACES.
•PROPANE GAS ODORANT MAY FADE, MAKING THE GAS UNDETECTABLE EXCEPT WITH A WARNING DEVICE.
A gas detecting warning system is the only reliable way to detect a propane gas leak. Rust can reduce the level of odorant in propane gas. Do not rely on your sense of smell. Contact a local propane gas supplier about installing a gas detecting warning system. If the presence of gas is suspected, follow the instructions on Page 3 of this manual.
All propane gas equipment must conform to the safety stan- dards of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 10 inch WC at the furnace manifold with all gas appliances in operation. Maintaining proper gas pressure depends on three main factors:
1.Vaporization rate, depending on temperature of the liquid, and “wetted surface” area of the container or containers.
2.Proper pressure regulation.
3.Pressure drop in lines between regulators, and between second stage regulator and the appliance. Pipe size will depend on length of pipe run and total load of all appliances.
Complete information regarding tank sizing for vaporization, rec- ommended regulator settings, and pipe sizing is available from most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most standard commercial compounds, special pipe dope must be used.
Refer to the following illustration for typical propane gas instal- lations and piping.
First Stage | 5 to 15 PSIG |
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(20 PSIG Max.) |
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Regulator | Continuous | |
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| 11" W.C. |
200 PSIG |
| Second Stage |
Maximum |
| Regulator |
Propane Gas Installation (Typ.)
PROPANE GAS PIPING CHARTS
Sizing Between First and Second Stage Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 BTU/hour.
| Pipe or |
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| Tubing Size, O.D. Type L |
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| Nominal Pipe Size | |||||||||||
| Tubing |
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| Schedule 40 | ||||||
| Length, |
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| 3/8" |
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| 1/2" |
| 5/8" |
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| 3/4" |
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| 7/8" | 1/2" |
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| 3/4" | |||||||
| Feet |
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| 10 |
| 730 |
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| 1,700 |
| 3,200 |
| 5,300 |
| 8,300 | 3,200 |
| 7,500 | ||||||||
| 20 |
| 500 |
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| 1,100 |
| 2,200 |
| 3,700 |
| 5,800 | 2,200 |
| 4,200 | ||||||||
| 30 |
| 400 |
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| 920 |
| 2,000 |
| 2,900 |
| 4,700 | 1,800 |
| 4,000 | ||||||||
| 40 |
| 370 |
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| 850 |
| 1,700 |
| 2,700 |
| 4,100 | 1,600 |
| 3,700 | ||||||||
| 50 |
| 330 |
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| 770 |
| 1,500 |
| 2,400 |
| 3,700 | 1,500 |
| 3,400 | ||||||||
| 60 |
| 300 |
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| 700 |
| 1,300 |
| 2,200 |
| 3,300 | 1,300 |
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| 310 | |||||||
| 80 |
| 260 |
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| 610 |
| 1,200 |
| 1,900 |
| 2,900 | 1,200 |
| 2,600 | ||||||||
| 100 |
| 220 |
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| 540 |
| 1,000 |
| 1,700 |
| 2,600 | 1,000 |
| 2,300 | ||||||||
| 125 |
| 200 |
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| 490 |
| 900 |
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| 1,400 |
| 2,300 | 900 |
| 2,100 | |||||||
| 150 |
| 190 |
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| 430 |
| 830 |
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| 1,300 |
| 2,100 | 830 |
| 1,900 | |||||||
| 175 |
| 170 |
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| 400 |
| 780 |
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| 1,200 |
| 1,900 | 770 |
| 1,700 | |||||||
| 200 |
| 160 |
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| 380 |
| 730 |
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| 1,100 |
| 1,800 | 720 |
| 1,500 | |||||||
| Sizing Between Second Stage and Appliance Regulator* |
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| Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. |
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| Capacities in 1,000 BTU/hour. |
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| Pipe or |
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| Tubing Size, O.D. Type L |
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| Nominal Pipe Size |
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| Tubing |
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| Schedule 40 |
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| Length, |
| 3/8" |
| 1/2" | 5/8" |
| 3/4" |
| 7/8" |
| 1/2" |
| 3/4" |
| 1" |
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| Feet |
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| 10 |
| 39 |
| 92 | 199 |
| 329 |
| 501 |
| 935 | 275 |
| 567 |
| 1,071 | 2,205 |
| 3,307 | |||
| 20 |
| 26 |
| 62 | 131 |
| 216 |
| 346 |
| 630 | 189 |
| 393 |
| 732 | 1,496 |
| 2,299 | |||
| 30 |
| 21 |
| 50 | 107 |
| 181 |
| 277 |
| 500 | 152 |
| 315 |
| 590 | 1,212 |
| 1,858 | |||
| 40 |
| 19 |
| 41 | 90 |
| 145 |
| 233 |
| 427 | 129 |
| 267 |
| 504 | 1,039 |
| 1,559 | |||
| 50 |
| 18 |
| 37 | 79 |
| 131 |
| 198 |
| 376 | 114 |
| 237 |
| 448 | 91 |
| 1,417 | |||
| 60 |
| 16 |
| 35 | 72 |
| 121 |
| 187 |
| 340 | 103 |
| 217 |
| 409 | 834 |
| 1,275 | |||
| 80 |
| 13 |
| 29 | 62 |
| 104 |
| 155 |
| 289 | 89 |
| 185 |
| 346 | 724 |
| 1,066 | |||
| 100 |
| 11 |
| 26 | 55 |
| 90 |
| 138 |
| 255 | 78 |
| 162 |
| 307 | 630 |
| 976 | |||
| 125 |
| 10 |
| 24 | 48 |
| 81 |
| 122 |
| 224 | 69 |
| 146 |
| 275 | 567 |
| 866 | |||
| 150 |
| 9 |
| 21 | 43 |
| 72 |
| 109 |
| 202 | 63 |
| 132 |
| 252 | 511 |
| 787 | |||
| 200 |
| 8 |
| 19 | 39 |
| 66 |
| 100 |
| 187 | 54 |
| 112 |
| 209 | 439 |
| 665 | |||
| 250 |
| 8 |
| 17 | 36 |
| 60 |
| 93 |
| 172 | 48 |
| 100 |
| 185 | 390 |
| 590 |
CIRCULATING AIR AND FILTERS
WARNING
NEVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON MONOXIDE, TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR SUPPLY.
Duct systems and register sizes must be properly designed for the CFM and external static pressure rating of the furnace. Ductwork should be designed in accordance with the recom- mended methods of “Air Conditioning Contractors of America” Manual D.
A duct system must be installed in accordance with Standards of the National Board of Fire Underwriters for the Installation of Air Conditioning, Warm Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B.
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