Refrigerant Tubing Connection And Evacuation; Refrigerant Flow-Control Device; Ground Connections; Minimum Cfm And Motor Speed Selection - Carrier fb4cnf024 Installation Instructions Manual

D.Ground C onnections
ELECTRICALSHOCK HAZARD
Failure
to follow this warning could result in personal iniury
or death.
According to NEC, ANSI/NFPA 70, and local codes, the
cabinet must have an uninterrupted or unbroken ground to
minimize personal iniury if an electrical fault should occur.
The ground may consist of electrical wire or metal conduit
when installed in accordance with existing electrical codes. If
conduit connection uses reducing washers, a separate ground
wire must be used.
NOTE: Use UL-listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs
provided in control box.
E. Minimum CFM and Motor Speed Selection
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed selected is
not lower than the minimum fan speed indicated.
FY5B fan speed selection is done at the fan relay printed-circuit
board. To change motor speeds, disconnect fan lead used on relay
terminal (SPT) and replace with motor speed tap desired. (See Fig.
17.) Save insulating cap and place on motor lead removed from
relay.
NOTE: In low static applications, lower motor speed tap should
be used to reduce possibility of water being blown off coil.
FY5B have 2 motor speed taps. Low speed (red) and high speed
(black). The 060 size only will have a Medium speed (blue).
See Table 2 - FY5B Airflow Performance (CFM), for each setting.
INSULATING CAP (2)
MOTOR 8
A97529
Fig. 17 - Fan Coil Relay and Speed Tap Terminal
for FY5B Models
The fan speed selection on the FB4C models is done at the motor.
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed selected is
not lower than the minimum fan speed indicated. To change motor
speeds disconnect the BLUE fan lead from 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 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
must 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 Table 1 - FB4C Airflow
Performance (CFM), for each tap setting. Also, see Fig. 18 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.
F
Fig. 18 - Motor Speed Selection
A09390
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.
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 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
FB4C units come equipped with a factory installed Piston with
Teflon ring metering device (sizes 018 thru 060). If a piston
replacement if required, check piston size shown on indoor unit