PROPANE GAS TANKS AND PIPING
WARNING
IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR A 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 AS CAN SETTLE IN ANY LOW AREAS OR CONFINED SPACES.
•PROPANE GAS ODORANT MAY FADE, MAKING THE GAS
UNDETECTABLE EXCEPT FOR 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 4 of this manual.
All propane gas equipment must conform to the safety standards of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 11 inch w.c. 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, recom- mended regulator settings, and pipe sizing is available from most regu- lator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most stan- dard commercial compounds, special pipe dope must be used.
Refer to the following illustration for typical propane gas installa- tions.
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 |
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| Second Stage |
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Maximum |
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| Regulator |
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Propane Gas Installation (Typ.)
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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| Nominal Pipe Size | |
Tubing |
| Tubing Size, O.D. Type L |
| Schedule 40 | |||
Length, | 3/8" | 1/2" | 5/8" | 3/4" | 7/8" | 1/2" | 3/4" |
Feet |
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10 | 730 | 1,700 | 3,200 | 5,300 | 8,300 | 3,200 | 7,500 |
20 | 500 | 1,100 | 2,200 | 3,700 | 5,800 | 2,200 | 4,200 |
30 | 400 | 920 | 2,000 | 2,900 | 4,700 | 1,800 | 4,000 |
40 | 370 | 850 | 1,700 | 2,700 | 4,100 | 1,600 | 3,700 |
50 | 330 | 770 | 1,500 | 2,400 | 3,700 | 1,500 | 3,400 |
60 | 300 | 700 | 1,300 | 2,200 | 3,300 | 1,300 | 3,100 |
80 | 260 | 610 | 1,200 | 1,900 | 2,900 | 1,200 | 2,600 |
100 | 220 | 540 | 1,000 | 1,700 | 2,600 | 1,000 | 2,300 |
125 | 200 | 490 | 900 | 1,400 | 2,300 | 900 | 2,100 |
150 | 190 | 430 | 830 | 1,300 | 2,100 | 830 | 1,900 |
175 | 170 | 400 | 780 | 1,200 | 1,900 | 770 | 1,700 |
200 | 160 | 380 | 730 | 1,100 | 1,800 | 720 | 1,500 |
To convert to capacities at 15 psig settings - multiply by 1.130
To convert to capacities at 5 psig settings - multiply by 0.879
Propane Gas Piping Chart I
Sizing Between Single or Second Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on 1/2" W.C. pressure drop at 11" W.C. setting. Capacities in 1,000 BTU/hour.
Pipe or |
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| Nominal Pipe Size |
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Tubing |
| Tubing Size, O.D. Type L |
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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" | |||
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 | 913 | 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 |
*Data in accordance with NFPA pamphlet NO. 54
Propane Gas Piping Chart II
XIII. CIRCULATING AIR & FILTERS
DUCTWORK - AIR FLOW
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. Design the ductwork in accordance with the recommended methods of “Air Con- ditioning Contractors of America” Manual D.
Install the duct system 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.
A closed return duct system must be used, with the return duct con- nected to the furnace. NOTE: Ductwork must never be attached to the back of the furnace. Flexible joints may be used for supply and return connections to reduce noise transmission. To prevent the blower from interfering with combustion air or draft when a central return is used, a connecting duct must be installed between the unit and the utility room wall. Never us a room, closet, or alcove as a return air chamber.
When the furnace is used in connection with a cooling unit, the fur- nace should be installed in parallel with or on the upstream side of the cooling unit to avoid condensation in the heating element. With a par- allel flow arrangement, the dampers or other means used to control the flow of air must be adequate to prevent chilled air from entering the furnace and, if manually operated, must be equipped with means to prevent operation of either unit unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is recommended that a removable access panel be provided in the outlet air duct. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for visual light inspection or such that a sampling probe can be inserted into the air- stream. The access panel must be made to prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return air entering the furnace must be between 55°F and 100°F.
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