Nortek B6BM Series, Installation Instructions Manual

8

1. Remove the cap from the end of the liquid line.

2. Verify pressurization by depressing the Schrader valve 

on the end of the liquid line. Listen for any escaping gas. 

If there is no pressure, test the coil for leakage.

•  If leakage is found, clearly mark the location of the leak 

and return the coil to the distributor for processing.

•  If no leaks are found, the coil may be installed.
3. Depress the valve to relieve all pressure from the coil.

4. Remove and discard the valve core.

 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!

5. Using two wrenches, loosen the nut and distributor body 

as shown in 

Figure 6

. Turn the assembly nut counter-clock-

wise until the orifice body halves are seperated.

6. Insert a light-gauge wire hook between the distributor body 

and the restrictor orifice while being careful not to scratch 

either part. Carefully remove the restrictor orifice from the 

distributor body. See 

Figure 7

.

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 8

.

 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.

Connecting the Linesets

the steps in the orifice Removal & Installation section 

must be performed before the linesets are connected.

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.

Figure 6. 

Loosening of Nut & Distributor Body

Figure 7. 

Restrictor Removal from Distributor Body

Figure 8. 

Installation of New orifice

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. Cut off the heat shrink and remove the plug from 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.