Reznor B6BM Unit Installation Manual - Manual (Page 9)

9
Connecting the Linesets
IMPORTANT NOTES FOR HORIZONTAL OR
DOWNFLOW INSTALLATIONS WITH TXV VALVE:
• The sensing bulb must be located flush against the
suction line for optimum heat transfer.
• Avoid attaching the sensing bulb to the lowest part of
the suction line where condensate may accumulate.
• Do not locate the sensing bulb on vertical sections
of the lineset.
• For horizontal lines, the bulb should not be located
at 12 or 6 o’clock position of the suction line. The
best location is at 4 or 8 o’clock.
• For additional information on proper sensing bulb
locations, please refer to the valve manufacturer’s
instructions.
IMPORTANT: The steps in the Orifice Removal &
Installation section (
page 8 ) must be performed before
the linesets are connected.
1. Remove grommets from line set holes.
CAUTION:
It is recommended that a wet rag be wrapped
around the suction line in front of the close off
plate or the sensing bulb (if TXV is installed)
before applying heat. Failure to keep components
cool during brazing may result in structural
damage, premature equipment failure, or possible
personal injury.
2. Unbraze and remove the cap on the suction line.
3. Route and cut both lineset tubes to proper length in
accordance with the outdoor unit specifications. Verify
the ends are round, clean, and free of any burrs.
4. Position grommet on line set with sufficient distance away
from brazing area. Brazing processes can permanently
damage grommets.
5. Connect the suction and liquid lineset tubes.
CAUTION:
It is recommended that a wet rag be wrapped
around the suction line in front of the close off
plate or the sensing bulb (if TXV is installed)
before applying heat. Failure to keep components
cool during brazing may result in structural
damage, premature equipment failure, or possible
personal injury.
6. Braze the individual connections with dry nitrogen
flowing through the joints. NOTE: This will prevent
internal oxidation and scaling from occurring.
7. Wrap the refrigerant lines with pressure sensitive
neoprene or other suitable material especially where
the lines enter the opening in the sheet metal.
Figure 6. Restrictor Insertion into Distributor Body
Figure 7. Removal of Orifice
7. Check the actual size of the new orifice. NOTE: The
size is stamped on its side. Do not use pin gauges to
measure the orifice diameter.
8. Insert the new orifice into the distributor body, rounded
end down. See Figure 7 .
CAUTION:
To prevent damage to the unit or internal
components, it is recommended that two
wrenches be used when loosening or tightening
nuts. Do not over tighten!
9. Realign the assembly nut on the distributor body and
hand tighten both components. Mark a line on both
bodies and then tighten an additional 1/4 turn using two
wrenches. The movement of the two lines will show how
much the nut is tightened. If a torque wrench is used,
tighten to 10-12 ft. lbs. or 14-16 Nm.