Flow Rates - Raypak AVIA 264A Installation And Operation Manual

MANUAL
SHUTOFF
VALVE
UNION
Figure 14. Manual Shutoff Valve Installation
Gas Pressure Adjustment Locations
CAP
ADJUSTMENT SCREW INSIDE
CLOCKWISE TO INCREASE
GAS VALVE
MANIFOLD
PRESSURE TAP
Figure 15. Gas Valve Adjustment
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
Natural Gas 1000 BTU/FT³ 0.60 Specific Gravity @ 0.5 in.
WC Pressure Drop
Propane Gas 2500 BTU/FT³ 1.53 Specific Gravity @ 0.5 in
WC Pressure Drop
Size 3/4" Size 1"
Model
No.
NAT PRO NAT PRO NAT
15 35 50
264
(4.6) (10.7) (12.2) (38.1)
15 20
404 *
(4.6) (8.8) (16.8)
* 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 L.
F10817
SUPPLY PRESSURE
TAP ON INLET SIDE
ft (m)
Size 1-1/4" Size 1-1/2"
PRO NAT
125 210 480 445
(64.0) (146.3) (135.6)
55 95 225 215
(29.0) (68.6) (65.5)
Gas Pipe Sizing

Flow Rates

Model
264/404
* When flow rates exceed maximum GPM an external auxiliary bypass
valve is required. See External Bypass Valve Section on page 21
for details.
Table M. Min/Max Flow Rates
Flow
GPM (lpm)
40 (151)
50 (189)
60 (227)
70 (265)
80 (303)
90 (341)
100 (379)
Table N.
NOTE: Table capacity is based on 2" Schedule 40 piping.
PRO
280
(85.3)
Pipe Size
Min. GPM (lpm) Max. GPM (lpm)
in. (mm)
2 (50.8) 40 (151)
Figure 16. Water Flow
Pressure Drop
Ft. of Head (m of Head)
264
7.2 (2.2)
10.0 (3.1)
12.6 (3.8)
17.0 (5.2)
24.0 (7.3)
30.3 (9.2)
36.0 (10.9)
Heat Exchanger Pressure Drops
100 (379)
F10818
404 (w/Coils)
13.4 (4.1)
16.5 (5.0)
19.5 (5.9)
23.7 (7.2)
28.3 (8.6)
33.2 (10.1)
37.0 (11.3)
19