Lanair HI140i - Manual (Page 15)

SECTION 7 CONTINUED
7.12 Install a 1/2” inside diameter (.493) steel pipe, or 1/2” outside diameter
copper from the fuel by-pass regulator (port marked “O”) to the fuel supply
pump. Do not allow this line to protrude into the tank more that 1” The use
of smaller line, or rubber, plastic or hydraulic line is unsafe and will void
your warranty.
7.13 Do not allow the fuel level in the tank to cover the return line.
7.14 Install the fuel supply line from the fuel by-pass regulator (port B) to the
inlet port on the left side of the burner using 1/2” inside diameter (.493)
steel pipe, or 1/2” outside diameter copper tubing. The maximum distance
of this line is 25 feet. The fuel supply line must be run below the burner at
all times. If the fuel supply line runs above the burner it will create head
pressure. This head pressure will overfire the burner voiding the warranty.
7.15 Install a union in the supply line close to the burner for service.
7.16 Install a shut-off valve in the fuel supply line at the fuel by-pass regulator for
service.
7.17 Use 37º flare fittings on all copper tubing connections. Do not use
compression fittings.
7.18 Keep the fuel supply lines 1” off any outside walls.
7.19 The fuel supply line must gradually rise to the burner. It should not be
higher than the burner.
7.20 Clean all lines, fittings, and parts internally before assembly. A small burr
or piece of rust could plug the nozzle. See Section 3.10 for an illustration of
a typical pump and piping installation.
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