Refrigerant Flow-Control Device; Condensate Drains - Carrier FB4CNF Installation Instructions Manual

FB4CNF, FB4CNP, FX4D: Installation Instructions
To change motor speeds disconnect the BLUE fan lead from motor
connector terminal #2 (factory default position) and move to desired
speed-tap; 1, 2, 3, or 5.
Speed-taps 1, 2, and 3 have a 90 second blower off time delay
pre-programmed into the motor. Speed-tap 4 is used for electric heat
only (with 0 second blower time delay) and the WHITE wire should
remain on tap 4. Speed-tap 5 is used for high static applications, but has
a 0 second blower time delay pre-programmed into the motor. See
Airflow Performance tables for actual CFM. Also, see Fig. 14 for motor
speed selection location.
NOTE: In low static applications, lower motor speed tap should be used
to reduce possibility of water being blown off coil.
REFRIGERANT TUBING CONNECTION AND
EVACUATION
Use accessory tubing package or field-supplied tubing of refrigerant
grade. Suction tube must be insulated. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow-control
device. ALWAYS evacuate the coil and field-supplied tubing to 500
microns before opening outdoor unit service valves.
CAUTION
!
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.
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 a deep
vacuum method.
CAUTION
!
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 TXV and
factory-made joints.

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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
BRASS
HEX NUT
TEFLON SEAL
STRAINER
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.

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.
Units are equipped with primary and secondary 3/4-in. FPT drain
connections. For proper condensate line installations see Fig. 1, 2, 3, 4
and 5. 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
18.) 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.
NOTE: When connecting condensate drain lines, avoid blocking filter
access panel, thus preventing filter removal. After connection, prime
both primary and secondary condensate traps.
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or property damage.
Use only full size P-traps in the condensate line (refer to Fig. 16).
Shallow running traps are inadequate and DO NOT allow proper
condensate drainage (refer to Fig. 17).
7
DISTRIBUTOR
TEFLON RING
PISTON
FLOW IN
COOLING
BRASS
PISTON
HEX BODY
RETAINER
CAUTION
CAUTION
A09677