Carrier FB4CNF - Refrigerant Flow-Control Device; Condensate Drains

7
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
A brazing shield MUST be used when tubing sets are being
brazed to the unit connections to prevent damage to the unit
surface and condensate pan fitting caps.
CAUTION
!
Units have sweat suction and liquid tube connections. Make
suction tube connection first.
1. Cut tubing to correct length.
2. Insert tube into sweat connection on unit until it bottoms.
3. Braze connection using silver bearing or non−silver bearing
brazing materials. Do not use solder (materials which melt
below 800F / 427C). Consult local code requirements.
4. Evacuate coil and tubing system to 500 microns using deep
vacuum method.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Wrap a wet cloth around rear of fitting to prevent damage to
piston assembly or TXV and factory−made joints.
CAUTION
!
Step 6 — Refrigerant Flow−Control Device
FB4CNF units contain a factory installed piston with Teflon ring
for sizes 018 thru 048 only. The FB4CNP and FX4D(018−061)
size units come equipped with a R−410A refrigerant TXV. If a
piston replacement is required, check piston size shown on indoor
unit rating plate to see if it matches required outdoor piston size.
The outdoor piston size will be found on the outdoor unit rating
plate, product data or installation instructions depending on the
model. If the fan coil piston does not match, replace indoor piston
with correct outdoor piston. With some outdoor units a piston is
shipped with outdoor unit; if no piston is shipped with the outdoor
unit one can be ordered from Replacement Components. When
changing piston, use a back−up wrench. (See Fig. 15). Hand
tighten hex nut, then tighten with wrench 1/2 turn. Do not exceed
30 ft−lbs.
TEFLON SEAL
BRASS
HEX NUT
STRAINER
PISTON
RETAINER
BRASS
HEX BODY
DISTRIBUTOR
PISTON
FLOW IN
COOLING
TEFLON RING
A09677
Fig. 15 − Refrigerant Flow − Control Device
NOTE: The indoor piston contains a Teflon ring (or seal) which is
used to seat against the inside of distributor body, and must be
installed properly to ensure proper seating in the direction for
cooling operation.
Always use outdoor units designed to match indoor fan coil
applications.
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper product
operation.
If using a TXV in conjunction with a single−phase
reciprocating compressor, a compressor start capacitor and
relay are required. Consult outdoor unit pre−sale literature for
start assist kit part number.
CAUTION
!
Step 7 — Condensate Drains
To connect drains, the cap openings must be removed. Use a knife
to start the opening near the tab and using pliers, pull the tab to
remove the disk. Clean the edge of the opening if necessary and
install the condensate line. Finally caulk around the lines where
they exit the fitting to retain the low leak rating of the unit.
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
The conversion of the fan coil to downflow requires special
procedures for the condensate drains on both A−coil and
slope units. The vertical drains have an overflow hole
between the primary and secondary drain holes. This hole is
plugged for all applications except downflow, but must be
used for downflow. During the conversion process, remove
the plastic cap covering the vertical drains only and discard.
Remove the plug from the overflow hole and discard. At
completion of the downflow installation, caulk around the
vertical pan fitting to door joint to retain the low air leak
performance of the unit.
CAUTION
!
Units are equipped with primary and secondary 3/4−in. FPT drain
connections. For proper condensate line installations see Fig. 1, 2,
3, 5 and 6. To prevent property damage and achieve optimum
drainage performance, BOTH primary and secondary drain lines
should be installed and include properly−sized condensate traps.
(See Fig. 16 and 17.) Factory−approved condensate traps are
available. It is recommended that PVC fittings be used on the
plastic condensate pan. Finger−tighten plus 1−1/2 turns. Do not
over−tighten. Use pipe dope.
2” MIN
(51 mm)
UNIT
2” MIN
(51 mm)
A03002
Fig. 16 − Recommended Condensate Trap