Flow Rates - Rheem Raypak 207A Installation And Operation Manual

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
WC Pressure Drop
Model 3/4"
207A 25 (7.6) 90 (27.4) 360 (109.7)
266L/267A 15 (4.6) 50 (15.2)
337A 10 (3.0) 30 (9.1)
399L/407A * 20 (6.1)
* 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
207A
1-1/4"–1-1/2"–2"
266L/267A 1-1/4"–1-1/2"–2"
337A 1-1/4"–1-1/2"–2"
399L/407A 1-1/4"–1-1/2"–2"
* When flow rates exceed maximum GPM an external auxiliary bypass valve is
required. See external bypass valve section for details.
Table J. Min/Max Flow Rates
14
3
0.60 Specific Gravity @ 0.5 in.
1" 1-1/4" 1-1/2"
210 (64.0) 445 (135.6)
140 (42.7) 290 (88.4)
95 (29.0) 215 (65.5)
Min. GPM (lpm) Max. GPM (lpm)
20 (75) 100 (378)
25 (95) 100 (378)
35 (132) 100 (378)
40 (151) 100 (378)
INLET
OUTLET
Figure 16. Polymer Headers Water Flow
INLET
OUTLET
Figure 17. Bronze Headers (ASME) Water Flow
Flow GPM
Ft. of Head (m of Head)
(lpm)
207A
20 (75) 4.0 (1.2)
25 (95) 4.0 (1.2)
30 (113) 4.0 (1.2)
35(132) 4.0 (1.2)
40 (151) 4.6 (1.4)
50 (189) 4.6 (1.4)
60 (227) 4.6 (1.4)
70 (265) 4.6 (1.4)
80 (303) 4.6 (1.4)
90 (340) 6.9 (2.1)
100 (378) 8.1 (2.5)
Table K. Polymer Heat Exchanger Pressure Drop -
Residential Models (UG Fully Open)
Pressure Drop
266L/267A 337A 399L/407A
4.6 (1.4)
5.2 (1.6)
5.8 (1.8) 5.2 (1.6)
5.8 (1.8) 5.2 (1.6) 5.2 (1.6)
6.3 (1.9) 6.9 (2.1) 6.9 (2.1)
6.9 (2.1) 6.9 (2.1) 6.9 (2.1)
8.1 (2.5) 9.2 (2.8) 9.2 (2.8)
9.2 (2.8) 9.8 (3.0) 9.8 (3.0)
10.4 (3.2) 10.4 (3.2) 10.4 (3.2)
11.0 (3.4) 12.1 (3.7) 12.1 (3.7)
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