Installation and Service Manual
The combination gas valves have an integral vent limiting device and does not require venting to atmosphere outside the building. The unit will not operate properly if the reference hose is removed or a vent to atmosphere is installed.
Optional gas controls may require routing of bleeds and vents to the atmosphere outside the building when required by local codes.
COMBINATION VALVE |
DOWNSTREAM |
TEST VALVE |
Connecting Gas Piping to Unit
All gas connections must be made with pipe joint compound resistant to the action of liquefied petroleum (L.P.) and natural gases. All piping must comply with local codes and ordinances. Piping installations must comply with approved standards and practices.
1.Make sure gas line is a separate line direct from the meter unless the existing gas line is of sufficient capacity. Verify pipe size with your gas supplier.
2.Use new, properly threaded black iron pipe free from chips. If you use tubing, make sure the ends are square, deburred and clean. Make all tubing bends smooth and without deformation. Avoid flexible gas connections. Internal diameter of flexible lines may not provide unit with proper volume of gas.
3.Install a manual main gas shutoff valve at the unit's gas inlet, outside of the unit.
4.Run pipe or tubing to the unit's gas inlet. If you use tubing, obtain a tube to pipe coupling to connect the tubing to the unit's gas inlet.
5.Install a sediment trap in the supply line to the unit's gas inlet (see Figure 17).
6.Apply a moderate amount of good quality pipe compound (do not use Teflon tape) to pipe only, leaving two end threads bare.
7.Remove seal over gas inlet to unit.
8.Connect gas pipe to inlet of unit. Use wrench to support gas manifold on the unit.
9.For L.P. gas, consult your L.P. gas supplier for expert installation.
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| TO BURNERS | ADDITIONAL VALVES BASED | |||
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| ON UNIT INPUTS | |
Figure 19 - Gas Train Drawing |
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Suggested Gas Pipe Size for Single Unit Installations | ||||||||
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Btu/hr |
| Distance From Meter (in feet) | ||||||
Input | ||||||||
495,000 |
| 1 1/4" |
| 1 1/2" |
| 2" |
| 2" |
1 1/4" |
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645,000 | 1 1/4" | 1 1/2" |
| 2" |
| 2" |
| 2 1/2" |
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745,000 | 1 1/2" | 2" |
| 2" |
| 2 1/2" | 2 1/2" | |
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985,000 | 2" | 2" |
| 2 1/2" |
| 2 1/2" |
| 3" |
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1,255,000 | 2" | 2 1/2" |
| 2 1/2" |
| 3" |
| 3" |
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1,435,000 | 2 1/2" | 2 1/2" |
| 3" |
| 3" |
| 3 1/2" |
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1,795,000 | 2 1/2" | 3" |
| 3" |
| 3 1/2" |
| 3 1/2" |
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2,065,000 | 2 1/2" | 3" |
| 3" |
| 3 1/2" |
| 4" |
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For each elbow or tee, add equivalent straight pipe to total length from table below.
Gas Train and Controls
Note: The gas train and controls assembly provided on this unit have been tested under the applicable American National Standard to meet minimum safety and performance criteria such as safe lighting, combustion and safety shutdown operation.
Figure 19 shows a typical gas train.
10.Ensure that all air is properly bled from the gas line before starting the ignition sequence. Start up without properly bleeding air from the gas line may require multiple reset functions of the ignition control module to achieve proper ignition.
WARNING: Do not have any open flame in proximity to the gas line when bleeding air from the gas line. Gas may be present.
Fittings to Equivalent Straight Pipe
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| Diameter Pipe (inches) |
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3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 3 | 4 | 5 |
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| Equivalent Length of Straight Pipe (feet) |
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2 | 2 | 3 | 4 | 5 | 10 | 14 | 20 |
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17
