6
Figure 7. Downflow Furnace with Coil
Cabinet
SMALL
PLATE
LARGE
PLATE
TABS
MOUNTING
HOLE
OFFSET
Figure 8. Close-Off Plates (Supplied with
appropriate blower conversion package)
5. REFRIGERANT lINE
CONNECTIONS
WARNING:
This coil is pressurized with Nitrogen.
Avoid direct face exposure or contact
with valve when gas is escaping. Al-
ways ensure adequate ventilation is
present during the depressurization
process. Any uncertainties should be
addressed before proceeding.
Note:
For coils with factory installed TXV valve
proceed to step #8.
Note
: Before proceeding with the connection of
the refrigerant lines, confirm that the orifice size
meets the requirements outlined in the outdoor
unit installation manual. Factory installed orifice
sizes are listed in the Specifications section. If
the restrictor orifice must be replaced, follow
the steps below:
1. Remove the valve cap from the end of the
liquid line. Relieve all pressure from the coil
by depressing the valve. Remove the valve
core. Properly dispose of all removed parts.
2. Loosen the orifice body halves by applying
two wrenches and squeezing them together
as shown in
Figure 9
, to turn the assembly
nut counter-clockwise.
3. Continue to unscrew the assembly nut to
separate it from the distributor body.
4. Insert a light-gauge wire hook between the
distributor body and the restrictor orifice to lift
the orifice out of the body.
(See Figure 10)
Carefully remove the restrictor orifice being
careful not to scratch either part.
5. Check the actual size of the new orifice. The
size is stamped on its side. Do not use pin
gauges to measure the orifice diameter.
6. Insert the new orifice in the distributor body,
rounded end down.
(See Figure 11)
7. After installing the orifice in the distributor
body, realign the assembly nut to the
distributor body. Mark a line along both
bodies after hand tightening and then
tighten an additional 1/4 turn. Caution: Do
not overtighten! The misalignment 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.
8. Remove the valve cap from the end of the
liquid line. Relieve all pressure from the coil
by depressing the valve. Remove the valve
core.
Note:
On models which use a TXV, it is
recommended to wrap a wet rag around the
suction line between the sensing bulb and
the line set braze joint before applying any
heat.
9. Unbraze and remove the cap on the suction
line. Unbraze and remove the valve core
holder on the liquid line.
10. Properly dispose of all removed parts.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard
1 Slight Hazard
1
0
0
