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Maximum Equivalent Pipe Length ft (m)
0.60 Specific Gravity @ 0.5 in. WC Pressure Drop
1.53 Specific Gravity @ 0.5 in. WC Pressure Drop
Size 3/4"
Model No.
NAT
15
264
(4.6)
404
*
*A 3/4" gas line can be used for up to 5' (1.5 m) maximum length from the gas valve in addition to the sediment trap.
EFFECTS OF LOW GAS PRESSURE
•
Pulsating burner flame/Flame lost
•
Delayed Ignition/Hard light off
•
Exposure to condensation
•
Emissions not at compliance levels
Natural Gas 1000 BTU/FT
Propane Gas 2500 BTU/FT
Size 1"
Size 1-1/4"
PRO
NAT
PRO
NAT
35
50
125
210
(10.7)
(12.2)
(38.1)
(64.0)
15
20
55
95
(4.6)
(8.8)
(16.8)
(29.0)
•
Damage burner
•
Sooting
•
Ignition failure
Gas Line Sizing
3
3
Size 1-1/2"
PRO
NAT
PRO
480
445
(146.3)
(135.6)
225
215
280
(68.6)
(65.5)
(85.3)
7
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