MiniMax® NT Series - Pentair

Installation (Gas Line)
8
Pipe Sized For Length Of Run In Equivalent Feet
MODEL
NAT
PIPE SIZING FOR GAS LINE CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH
Natural gas at 1000 B.T.U. per Cubic Foot
Propane Gas at 2500 B.T.U. per Cubic Foot
Table 1.
1 /2” 3 /4”
1 ” 1 -1/4”
1 -1/2”
2 ” 2-1/2”
PRO
NAT
PRO
NAT
PRO
NAT
PRO
NAT
PRO
NAT
PRO
200
- 20’
30’
80’
125’
250’
450’
600’
- - - - - -
250
- 10’
20’
50’
70’
150’
250’
500’
600’
- - - - -
300
- - 10’
30’
50’
100’
200’
350’
400’
600’
- - - -
400
- - - 10’
20’
60’
100’
150’
200’
450’
400’
- - -
NAT
PRO
“RESIDENTIAL” PROPANE 2 STAGE REGULATION
In many Propane gas line installations, the gas supplier and/or installer will utilize a two stage regulation process
where by at the supply tank they will install the first stage gas regulator, which would be at a higher pressure, usually
10 psi. This higher pressure allows for a much longer distance and in a much smaller pipe size. Then within a short
distance of the pool heater, usually around 24 inches, they will install a second regulator, which is the second stage,
and this would be set at the required inlet pressure of the heater.
See “Gas Pressure Requirement Charts”
Stage One "High Pressure" Gas Pipe Sizing
10 PSI @ 2500 B.T.U. Per CU. FT.
MAXIMUM EQUIVALENT PIPE LENGTH
M odel 0 to 50 Ft.
50
to 100 Ft.
100 to 150 Ft.
75
through 400 1 /2 in.
1 /2 in.
1/2 in.
Stage Two "Low Pressure" Gas Pipe Sizing
Stage 2 set at 14 in. W.C.
MAXIMUM EQUIVALENT PIPE LENGTH
M odel 0 to 10 Ft.
10 to 20 Ft.
75
through 400 3 /4 in.
3/4 in.
Table 2. Table 3.
“RESIDENTIAL” NATURAL GAS 2 STAGE REGULATION
In many Natural gas line installations, the gas supplier and/or installer may utilize a two stage regulation process
where by at the streets main gas supply they will install the first stage gas regulator, which would be at a higher
pressure. This higher pressure is usually set at 2 psi or 5 psi and can be for long distances and in a much smaller pipe
size. Then within a short distance of the pool heater, generally around 24 inches, they will install a second regulator,
which is the second stage. This second stage regulator would be set at the minimum operating pressure for the heater.
For “Natural Gas Pentair Pool Heaters” the minimum is 7 inches W.C.
See “Gas Pressure Requirement Charts”
Stage One "High Pressure" Gas Pipe Sizing
2 PSI @ 1000 B.T.U. Per CU. FT.
MAXIMUM EQUIVALENT PIPE LENGTH
M odel 0 to 50 Ft.
50
to 100 Ft.
100 to 150 Ft.
75
through 300 1 /2 in.
1 /2 in.
1/2 in.
350
& 400 3 /4 in.
3 /4 in.
3/4 in.
5 PSI @ 1000 B.T.U. Per CU. FT.
75
through 400 1 /2 in.
1 /2 in.
1/2 in.
Stage Two "Low Pressure" Gas Pipe Sizing
Stage 2 set at 7 in. W.C.
MAXIMUM EQUIVALENT PIPE LENGTH
M odel 0 to 10 Ft.
10 to 20 Ft.
75
through 300 3 /4 in.
3/4 in.
350
& 400 3 /4 in.
1 in.
Stage 2 set at 7 in. W.C.
75
through 400 3 /4 in.
1 in.
Table 4. Table 5.
P/N NTSM03 Rev. B 2-11-04