Step 5 - Refrigerant Tubing Connection And Evacuation; Step 6 - Refrigerant Flow- -Control Device - Carrier FB4C Installation Instructions Manual

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
pre-programmed into the motor. See Airflow Performance tables
for actual CFM. Also, see Fig. 16 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.
1 2 3 4 5
Speed Taps may be located on motor,
or on plug close to motor.
1 2 3 4 5
Fig. 16 - - Motor Speed Selection for FB4C Only
Step 5 — 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.
0 second blower time
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.
delay
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.
Step 6 — Refrigerant Flow- -Control Device
FB4CNF units contain a factory installed piston with Teflon ring
for sizes 018 thru 048 only. The FB4CNP(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.
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. 17). Hand
tighten hex nut, then tighten with wrench 1/2 turn. Do not exceed
30 ft- -lbs.
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.
BRASS
HEX NUT
A11048
STRAINER
Fig. 17 - - Refrigerant Flow - - Control Device
7
CAUTION
With some outdoor units a piston is
DISTRIBUTOR
TEFLON SEAL
TEFLON RING
PISTON
FLOW IN
COOLING
PISTON
RETAINER
BRASS
HEX BODY
A09677