Cooling Mode - Carrier FX4D Series Installation Instructions Manual

FX4D: Installation Instructions
NOTE: When connecting condensate drain lines, avoid blocking filter
access panel, thus preventing filter removal. After connection, prime
both primary and secondary condensate traps.
WARNING
!
PRODUCT 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. 17 – Recommended Condensate Trap
DO NOT USE SHALLOW RUNNING TRAPS!
Fig. 18 – Insufficient Condensate Trap
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)
Fig. 19 – Condensate Drain
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)
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED 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. 19.) 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.
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. 17).
Shallow running traps are inadequate and DO NOT allow proper
condensate drainage (refer to Fig. 18).
HUMIDIFIER
A03002
Connect humidifier and humidistat to fan coil unit as shown in Fig. 20
and Fig. 21. The cooling lockout relay is optional.
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.
NOTE: Speed taps 1, 2 and 3 have a 90 second blower off delay. Speed
taps 4 and 5 have 0 second blower off delay.

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
A03013
motor. When G is de-energized, there is a 90 second delay before fan
relay opens.
NOTE: Speed taps 1, 2 and 3 have a 90 second blower off delay. Speed
taps 4 and 5 have 0 second blower off delay.
HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
Thermostat energizes R to G, R to Y, and R to W. G energizes fan relay
on PCB which completes circuit to indoor blower motor. W energizes
electric heat relay(s) which completes circuit to heater element(s). When
W is de-energized, electric heat relay(s) open, turning off heater
elements. When G is de-energized there is a 90 second delay before fan
relay opens.
NOTE: Speed taps 1, 2 and 3 have a 90 second blower off delay. Speed
taps 4 and 5 have 0 second blower off delay.
ELECTRIC HEAT OR EMERGENCY HEAT MODE
Thermostat closes R to W. W energizes electric heat relay(s) which
A03003 completes circuit to heater element(s). Blower motor is energized
through normally closed contacts on fan relay. When W is de-energized,
electric heat relay(s) opens.
8
CAUTION
!
ACCESSORIES