Installing The Suction Oil Line Components - Saturn 125 Operator's Manual

Installing the Suction Oil Line Components

ATTENTION: It is critical that you adhere to the following specifications for suction oil line
installation (oil line from the tank to the pump). If these specifications are not met, the metering pump will
not function correctly and the burner will shut down on reset. The majority of service problems with the
metering pump are caused by leaks at fittings in the suction oil line; these problems are eliminated by ensuring a
100% airtight suction oil line which slants up to the pump.
• All suction oil line components must be installed as shown in Figures 4H and 4J. Suction line size
is 1/2" diameter. Proper installation allows the suction oil line to be filled with used oil during initial
priming.
• The suction oil line may NOT exceed 6 feet TOTAL vertical lift and 4 feet total horizontal lift
(which equals 6.0" hg maximum operating vacuum). To determine if your suction oil line will meet
this specification for maximum operating vacuum, base the calculation for your installation on the
following equivalents:
(1) vertical foot
(4) horizontal feet
NOTE: ALSO ADD 0.75" hg to the final sum to account for every oil filter, shut-off valve, and
check valve on the suction side of the pump assembly.
Sample calculation: (6) vertical feet x 0.75" = 4.50" hg AND (4) horizontal feet = 0.75" hg
4.50" hg + 0.75" hg + 0.75" hg = 6.00 " hg vacuum
• The metering pump must be installed with a 3/4" check valve at the end of the suction oil line, or
the pump will not maintain its prime.
• Use Permatex #2 non-hardening gasket sealer on every threaded fitting. DO NOT use
teflon tape or teflon pipe dope compounds; the teflon can flake off and cause damage to the
pump head.
• The suction oil line must be 100% airtight for proper system functioning. Use only
high-quality flare fittings for the copper tubing. DO NOT use compression fittings.
DO NOT use any steel pipe unions. DO NOT use sweat copper pipe. These types of fittings
cause air leaks in the suction oil line and will require re-installation.
• The suction oil line must slant up to the pump; any high spots will trap air and will not
allow the pump to prime.
1. Assemble the suction oil line fittings (from the metering pump to the canister filter):
a. Refer to Figure 4H for a detailed look at the metering pump components and fittings.
b. Remove the plug from the 1/4" inlet port of the pump.
c. Install the 1/4" x 3" brass nipple into the 1/4" inlet port on the pump.
d. Install the 1/4" brass street elbow onto the 3" brass nipple; turn the fitting onto the nipple until it is
tight and faces away from the pump mounting plate.
e. Prepare the canister filter for installation:
• Install the 3/4" x 1/4" brass hex bushing into the outlet port of the canister filter.
Check the direction of the arrow for the proper flow.
• Install the 3/4" x 1/2" brass bushing into the inlet port of the canister filter.
Operator's Manual: Models Saturn™ 140 & Saturn™ 230
= 0.75" hg (vacuum)
= 0.75" hg (vacuum)
4-13