regulator must be installed to reduce the gas supply pressure to a maximum of 10.5 in. WC for natural gas and 13.0 in. WC for propane gas. The regulator should be placed a minimum distance of 10 times the pipe diameter
Gas Supply Connection
CAUTION: The heater must be disconnected from the gas supply during any pressure testing of the gas supply system at test pressures in excess of 1/2 psi (3.45 kPa).
The heater must be isolated from the gas supply pip- ing system by closing the manual
THIS PROCEDURE MAY DAMAGE THE GAS VALVES. Over pressurized gas valves are not cov- ered by warranty. The heater and its gas connections shall be
Fig. 14: Gas Supply Connection
CAUTION: Do not use Teflon tape on gas line pipe thread. A pipe compound rated for use with natural and propane gases is recommended. Apply sparingly only on male pipe ends, leaving the two end threads bare.
Model |
| 3/4” |
| 1” |
| 2” |
| 3” |
| 4” | |||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
No. | N |
| P | N |
| P | N | P | N | P | N |
| P | N | P | N |
| P | N |
| P |
|
|
|
|
|
| ||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
399B |
|
| 15 | 25 |
| 60 | 100 | 260 | 250 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
499B |
|
|
|
|
|
| 65 | 150 | 130 | 360 | 500 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
649B |
|
|
|
|
|
| 45 | 100 | 95 | 250 | 340 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
749B |
|
|
|
|
|
| 35 | 80 | 75 | 180 | 260 |
| 600 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
899B |
|
|
|
|
|
| 20 | 45 | 45 | 110 | 150 |
| 360 | 400 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
989B |
|
|
|
|
|
|
|
|
|
| 120 |
| 300 | 300 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1259B |
|
|
|
|
|
|
|
|
|
| 75 |
| 180 | 170 | 325 | 560 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1529B |
|
|
|
|
|
|
|
|
|
| 50 |
| 120 | 125 | 250 | 400 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1799B |
|
|
|
|
|
|
|
|
|
| 40 |
| 100 | 100 | 225 | 340 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1999B |
|
|
|
|
|
|
|
|
|
| 30 |
| 80 | 75 | 175 | 260 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2069B |
|
|
|
|
|
|
|
|
|
| 30 |
| 80 | 75 | 175 | 260 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2339B |
|
|
|
|
|
|
|
|
|
| 20 |
| 55 | 55 | 135 | 160 |
| 400 | 600 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Natural gas – 1,000 BTU per ft3, .60 specific gravity at 0.5 in. WC pressure drop
Propane gas – 2,500 BTU per ft3, 1.53 specific gravity at 0.6 in. WC pressure drop
Table I: Maximum Equivalent Pipe Length
19