Refrigerant Line Connections; Orifice Removal & Installation; Connecting The Linesets - Maytag B6BM series Installation Instructions Manual

Refrigerant Line connections

wARNING:
the coil in the air handler is factory shipped with
a nitrogen charge. Avoid direct face exposure
or contact with valve when gas is escaping.
Always ensure adequate ventilation is present
during the depressurization process. Address
any uncertainties before proceeding. Failure
to comply with this warning could result in
equipment damage, personal injury, or death.
• The installer should make every effort to ensure the field
installed refrigerant containing components of the system
have been installed in accordance with these instructions
and sound installation practices for reliable system
operation and longevity.
• The air handler coil does not contain a refrigerant charge.
Refer to the installation instructions supplied with the
outdoor unit for refrigerant charge information.
• Always refer to the installation instructions supplied with
the outdoor unit for piping requirements. The suction and
liquid lines must be sized in accordance with the condensing
unit specifications. See
and suction line locations.
• When connecting refrigerant linesets together, it is
recommended that dry nitrogen be flowing through the
joints during brazing. This will prevent internal oxidation
and scaling from occurring.
• Refrigerant tubing should be routed in a manner that
minimizes the length of tubing and the number of bends in
the tubing. It should be supported in a manner that prevents
it from vibrating or abrading during system operation. Tubing
should be kept clean of foreign debris during installation.
• If precise forming of refrigerant lines is required, a copper
tubing bender is recommended. Avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
• Refrigerant lines should be wrapped with pressure sensitive
neoprene or other suitable material where they pass against
sharp sheet metal edges.
• B6 Series air handlers are charged (with nitrogen) through
service valves on the end of the liquid tube for each circuit.
These must be removed before brazing the line sets.
Orifice Removal & Installation
The orifice installed in the air handler has been sized for use
with the most popularly matched outdoor units. The orifice
size as shipped from the factory is listed on the air handler
rating plate. Perform steps 1 - 9 to confirm that the orifice
size meets the requirements outlined in the outdoor unit
installation manual.
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.
8
NITROGEN
1
HEALTH
0
FLAMMABILITY
0
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
Figure 12 (page 15) for liquid
• 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 5. 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 6 (page
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
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

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.
9).
7.