15
MANUAL
SHUT-OFF
VALVE
UNION
F10639-4
Figure 14. Manual Shut-O Valve Installation
Gas Pressure Adjustment Locations
Gas Pressure Adjustment
Figure 15. Honeywell VR8340)
Pipe Sizing for Gas Connection
The capacities shown below are based on using SCH
40 black iron pipe. For capacities using other materials,
consult local codes.
Maximum Equivalent Pipe Length (ft) (m)
Natural Gas 1000 BTU/FT
3
0.60 Specic Gravity @ 0.5
in. WC Pressure Drop
Model 3/4" 1" 1-1/4" 1-1/2"
207A 25 (7.6) 90 (27.4) 360 (109.7) n/a
267A 15 (4.6) 50 (15.2) 210 (64.0) 445 (135.6)
337A 10 (3.0) 30 (9.1) 140 (42.7) 290 (88.4)
407A * 20 (6.1) 95 (29.0) 215 (65.5)
* 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.
Table I. Gas Pipe Sizing
Flow Rates
Model Pipe Size Min. GPM (lpm) Max. GPM (lpm)
207A 1-1/4"–1-1/2"–2" 20 (75) 125 (473)
267A 1-1/4"–1-1/2"–2" 25 (95) 125 (473)
337A 1-1/4"–1-1/2"–2" 35 (132) 125 (473)
407A 1-1/4"–1-1/2"–2" 40 (151) 125 (473)
* When ow rates exceed maximum GPM an external auxiliary bypass valve is
required. See external bypass valve section for details.
Table J. Min/Max Flow Rates
Figure 16. Polymer Headers Water Flow
F10637-1
Figure 17. Brass Headers (ASME) Water Flow
6000.592_PoolSpa_LoNOx.indd 15 10/21/2019 2:23:48 PM
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