3.Boiler installation site experiences gusting or high winds. A power venter can help prevent the boiler from short cycling due to gusting or high winds by providing vent exhaust pressures greater than the boiler's induced draft blower alone.
4.When installer or homeowner prefers a negative pressure vent system instead of a positive pressure vent system.
5.May be more cost effective than stainless steel venting, particularly at longer vent lengths.
The Fields Controls power vent kit includes either a
Confirm that installing a power venter is an option allowed by local codes. For installation information, follow specific Installation Instructions provided with power venter kit.
NOTE: Although the power venter is equipped with its own fan, the fan on the boiler MUST remain in place and unaltered when a power venter is used.
When sidewall venting, flue gases must be vented to a point in relation to the prevailing wind so they may freely disperse without being blown back at the building causing discoloration, or into the building through doors or windows causing odors. Also, under certain conditions flue gases will condense, forming moisture. In such cases, steps should be taken to prevent building materials at the vent terminal from being damaged by the exhausted flue gas.
When installing single wall galvanized vent pipe for power venting, follow specific power venter Installation Instructions for layout, location of barometric draft control, and termination connections. When joining and sealing single wall galvanized or
GAS SUPPLY PIPING
PROCEDURE 1ÐCHECKING GAS SUPPLY
The gas pipe to boiler must be the correct size for length of run and for total Btuh input of all gas utilization equipment connected to it. See Table 5 for proper size. Be sure gas line complies with local codes and gas company requirements.
The boiler and its individual shutoff valve must be disconnected from gas supply piping system during any pressure testing of gas supply piping system at test pressures in excess of 0.5 psig (3.5 kPa).
The boiler must be isolated from gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 0.5 psig (3.5 kPa).
PROCEDURE 2ÐCONNECTING GAS PIPING
Refer to Fig. 6 for general layout at boiler. It shows the basic fittings needed. The gas line enters boiler from right side.
The following rules apply:
1.Use only those piping materials and joining methods listed as acceptable by the authority having jurisdiction or in the absence of such requirements, by the NFGC. In Canada, follow the
2.All pipe compound must be resistant to propane gas.
3.Install ground joint union in gas supply line between shutoff valve and boiler controls.
Table 5ÐGas Pipe Sizes
NATURAL GAS
Length |
|
| Pipe CapacityÐBtuh Input |
| |||
of Pipe |
|
| Includes Fittings |
| |||
(Ft) | 1/2 in. |
| 3/4 in. |
| 1 in. | ||
20 | 92,000 |
| 190,000 |
| 350,000 | 625,000 | |
40 | 63,000 |
| 130,000 |
| 245,000 | 445,000 | |
60 | 50,000 |
| 105,000 |
| 195,000 | 365,000 | |
|
| PROPANE GAS |
|
| |||
Length |
|
| Pipe CapacityÐBtuh Input |
| |||
|
| Includes Fittings |
| ||||
of Pipe |
|
|
| ||||
Copper Tubing* | Iron Pipe | ||||||
| |||||||
(Ft) | 5/8 in. |
| 3/4 in. |
| 1/2 in. | 3/4 in. | |
20 | 131,000 |
| 216,000 |
| 189,000 | 393,000 | |
40 | 90,000 |
| 145,000 |
| 129,000 | 267,000 | |
60 | 72,000 |
| 121,000 |
| 103,000 | 217,000 | |
* Outside diameter.
NOTE: The length of pipe or tubing shown should be measured from gas meter or propane
MANUAL
SHUTOFF
VALVE
GROUND JOINT
UNION
AUTOMATIC
GAS VALVE
MANIFOLD
SEDIMENT TRAP 
FLOOR LINE
A95148
Fig. 6ÐGas Piping at Boiler
Ð10Ð
