Raypak 1005 - Manual (Page 16)

Table G: Boiler Temperatures and Minimum Pipe Size at Varying Return Temperatures
System
Return Temp Supply Temp 1 Supply Temp 1 Supply Temp 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
80 138 2"NPT 2 1/2"NPT 147 2"NPT 2 1/2"NPT 154 2 1/2"NPT 3"NPT
100 138 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
140 165 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 size.
Model 1005
Minimum Pipe Size 2
Model 1505
Minimum Pipe Size 2
Model 2005
Minimum Pipe Size 2
2 -Minimum pipe size based on total equivalent feet of supply and return piping between the system loop and heater.
Fig. 14: Single Heater with Primary/Secondary Piping
Fig. 15: Dual Heaters (Reverse/Return)
with Primary/Secondary Piping
Fig. 16: Single Domestic Hot Water Heater and Storage
Tank
16
Domestic Hot Water
When designing the hot water piping system for
domestic hot water applications, water hardness
should be considered. See Table I on page 18 for the
required tubing sizes and expected supply tempera-
tures for different operating conditions. Water
hardness is expressed in grains per gallon.
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
Table H: Equivalent Lengths of Pipe for Typical Fittings
Note: Equivalent lengths are calculated based on typical operating
conditions with typical Schedule 40 pipe fittings and valves.
Equivalent lengths are approximate and may vary greatly.
*Maximum 4 times the pipe diameter or 12”, whichever is less.
*Maximum 4 times the pipe diameter or 12”, whichever is less.