Operator's Manual: Models CB-1750, CB-2500 & CB-3250
4-15
2.
Install the suction oil line (from the the tank to the canister filter):
a. Refer to Figures 4H and 4J.
b. Prepare a piece of 1/2" O.D. copper tubing (user-supplied) which will function as the pick-
up line from the tank to the canister filter. This copper tubing must have the following
specifications:
• The tube must be one continuous piece of 1/2" O.D. copper tubing with no kinks or fittings.
• The tube is to slant up from the tank to the pump with no loops or high points to trap air.
c. Locate the 2" MPT x 1/2" FPT x 1/2" FPT duplex, slip-thru hex bushing (which will eventually
be installed into one of the 2" openings on the tank).
Note that the fitting is marked "S" for
suction and "R" for return.
d. Install the 1/2" MPT x 1/2" slip fitting into the "S" side of the 2" duplex slip-thru hex bushing.
e. Install the 1/4" MPT x 1/4" compression fitting into the 1/2" x 1/4" brass bushing.
f. Install the 1/2" x 1/4" brass bushing into the "R" side of the 2" duplex slip-thru hex bushing.
g. Measure the height of the oil tank (from the bottom of the tank, NOT the floor) to the 2" opening
that you are going to use for the supply oil line. Deduct 12" (305mm) from this measurement
and transfer this new measurement onto the 1/2" O.D. copper tubing.
h. Remove the locking nut and ferrel sleeve connector from the 1/2" slip fitting, and slide them over
the copper tubing.
i. Slide the 1/2" O.D. copper tubing through the 1/2" slip fitting, which is installed in the "S" side
of the 2" hex bushing.
j. Install the screen into one side of the 3/4" check valve (making sure the arrow is pointing away
from the screen assembly).
k. Install the 3/4" x 1/2" brass bushing into the 3/4" check valve.
l. Install the 1/2" MPT x 1/2" flare adapter into the 3/4" x 1/2" brass bushing.
m. Slide the 1/2" flare nut over the end of the 1/2" copper tubing, and flare the end of the tubing.
NOTE:
Use a high-quality flaring tool (such as a Ridgid Flaring Tool) to ensure that all flares
are made properly (i.e. so they will be 100% airtight).
n. Install the flared oil line and nut onto the assembled check valve/screen and tighten.
o. Pick up the assembled oil line, and carefully guide the end of the tubing with the check valve
through the 2" tank opening.
p. Apply Permatex #2 non-hardening gasket sealer (or equivalent) to the threads of the 2" duplex
slip-thru tank bushing, and tighten this fitting into the tank.
q. Pull the 1/2" copper tubing back up through the slip fitting until you see the mark that you put
on the tubing earlier. Holding the tubing with one hand, push the ferrel sleeve connector and
locking nut down the tubing, then tighten onto the 1/2" slip fitting. The oil line is now installed
in the correct position off of the bottom of the tank.
r. Carefully bend the oil line up to the canister filter; use a spring bender over the oil line while
bending the tubing to prevent kinks in the oil line. Allowing for the flare nut, cut off the excess
tubing.
s. Install the 1/2" flare nut onto the tubing, and flare the end of the tubing.
t. Install the end of the tubing with the flare nut onto the 1/2" flare adapter (on the ball valve
assembly at the canister filter).
u. Install a vent from the tank to the outside of the building according to code. The tank must be
properly vented to allow air to enter the tank as oil is pumped out and to safely vent fumes to the
outside. See Figure 4J.
v. Install plugs in all other tank openings as required by code.
w. Inspect the installation. For proper suction oil line operation, make sure all components are
installed and positioned as specified in this manual.
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