Rheem Raypak XTherm 1005A - Page 15

15
Air-Separation/Expansion Tank
All heaters should be equipped with a properly sized
expansion tank and air separator fitting as shown in
Fig. 12 .
Fig. 12: Air-Separation/Expansion Tank
System
R
eturn Temp Su
pp
l
y
Temp
1
S
u
p
p
l
y
Tem
p
1
Su
pp
l
y
Tem
p
1
(
°F) (°F) <80' equiv. 80-200' equiv. (°F) <80' equiv. 80-200' equiv. (°F) <80' equiv. 80-200' equiv.
60 138 2"NPT 2 1/2"NPT 147 2"NPT 2 1/2"NPT 154 2"NPT 2 1/2"NPT
8
0 138 2"NPT 2 1/2"NPT 147 2"NPT 2 1/2"NPT 154 2 1/2"NPT 3"NPT
1
00 138 2 1/2"NPT 3"NPT 147 2 1/2"NPT 3"NPT 154 2 1/2"NPT 3"NPT
120 145 2 1/2"NPT 3"NPT 158 2 1/2"NPT 3"NPT 170 2 1/2"NPT 3"NPT
1
40 165 2 1/2"NPT 3"NPT 178 2 1/2"NPT 3"NPT 190 2 1/2"NPT 3"NPT
160 185 2 1/2"NPT 3"NPT 198 2 1/2"NPT 3"NPT 210 2 1/2"NPT 3"NPT
1
-
Approximate high fire heater outlet temperature based on the standard heater pump and the recommended connecting pipe
s
ize.
M
odel 1005
M
inimum Pi
p
e Size
2
M
odel 1505
M
inimum Pi
p
e
Size
2
M
odel 2005
M
inimum Pi
p
e Size
2
2
-Minimum
p
i
p
e size based on total e
q
uivalent feet of su
pp
l
y
and return
p
i
p
in
g
between the s
y
s
tem loo
p
and heater.
T
able F: Boiler Temperatures and Minimum Pipe Size at Varying Return Temperatures
Fitting Type
Equivalent Length (ft)
2-1/2” NPT 3” NPT
90° Elbow (Std.) 8.5 9.4
90° Elbow (Long rad.) 3.5 3.6
45° Elbow 3.0 3.4
Gate Valve (Full open) 1.6 1.6
Swing Check Valve 22 25