Cooling Mode - Carrier FB4CNF Installation Instructions Manual

FB4CNF, FB4CNP, FX4D: Installation Instructions
CAUTION
!
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this warning 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-coil units. The
vertical drains have an overflow hole between the primary and
secondary drain holes. This hole is plugged for all applications except
downflow, and must be used for downflow. During conversion process,
remove plastic cap covering vertical drains only and discard. Remove
plug from overflow hole and discard. At completion of downflow
installation, caulk around vertical pan fitting to door joint to retain low
air leak performance of the unit.
UNIT
Fig. 16 – Recommended Condensate Trap
DO NOT USE SHALLOW RUNNING TRAPS!
Fig. 17 – Insufficient Condensate Trap
NOTE: If unit is located in or above a living space where damage may
result from condensate overflow, a field-supplied, external condensate
pan should be installed underneath the entire unit, and a secondary
condensate line (with appropriate trap) should be run from the unit into
the pan. Any condensate in this external condensate pan should be
drained to a noticeable place. As an alternative to using an external
condensate pan, some localities may allow the use of a separate 3/4-in
(19 mm) condensate line (with appropriate trap) to a place where the
condensate will be noticeable. The owner of the structure must be
informed that when condensate flows from the secondary drain or
external condensate pan, the unit requires servicing or water damage will
occur.
Install traps in the condensate lines as close to the coil as possible. (See
Fig. 18.) Make sure that the outlet of each trap is below its connection to
the condensate pan to prevent condensate from overflowing the drain
pan. Prime all traps, test for leaks, and insulate traps if located above a
living area. Condensate drain lines should be pitched downward at a
minimum slope of 1-in (25 mm) for every 10-ft (3 m) of length. Consult
local codes for additional restrictions or precautions.
ACCESSORIES
HUMIDIFIER
Connect humidifier and humidistat to fan coil unit as shown in Fig. 19
and Fig. 20. The cooling lockout relay is optional.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2" MIN
(51 mm)
2" MIN
(51 mm)
PRIMARY TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP OF
SUFFICIENT DEPTH.
STANDARD P-TRAPS ARE
NOT SUFFICIENT. SEE
FIGURE OF RECOMMENDED
CONDENSATE TRAP)
SEQUENCE OF OPERATION
CONTINOUS FAN
Thermostat closes R to G. G energizes fan relay on PCB which
completes circuit to indoor blower motor. When G is de-energized, there
is a 90 second delay before relay opens.
THERMOSTAT
A03002
115V
A03013
Fig. 19 – Wiring Layout of Humidifier to Heat Pump
THERMOSTAT
FAN HUMIDIFIER
115V
Fig. 20 – Wiring Layout of Humidifier to Fan Coil

COOLING MODE

Thermostat energizes R to G, R to Y, and R to O (heat pump only). G
energizes fan relay on PCB which completes circuit to indoor blower
motor. When G is de-energized, there is a 90 second delay before fan
relay opens.
8
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP)
Fig. 18 – Condensate Drain
FAN COIL
HEAT PUMP
(CONTROL)
(CONTROL)
RED
R R
R
GRY
G G
BRN
C C
C
WHT
W W
2 2
WHT
BLU
W
3
E
VIO
E
L
W
2
O O
Y Y
FAN HUMIDIFIER RELAY
M
HUMIDISTAT
FAN COIL
(CONTROL)
RED
R R
GRY
G G
WHT
W W
2
WHT
BLU
W
3
VIO
E
BRN
AIR COND.
C
C
Y Y
HUMIDISTAT
M
with Electric Heat
A03003
A95294
A95295