Step 8 - Accessories; Step 9 - Sequence Of Operation - Carrier FB4CNP Installation Instructions Manual

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. 17 − Condensate Trap and Unit
CAUTION
!
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Shallow running traps are inadequate and DO NOT allow
proper condensate drainage. (See Fig. 18.)
DO NOT USE SHALLOW RUNNING TRAPS!
Fig. 18 − Insufficient Condensate Trap
NOTE: When connecting condensate drain lines, avoid blocking
filter access panel, thus preventing filter removal. After connection,
prime both primary and secondary condensate traps.
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. 17.) 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
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP)
A03003
A03013
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.
Step 8 — Accessories
Humidifier
Connect humidifier and humidistat to fan coil unit as shown in Fig.
19 and Fig. 20. The cooling lockout relay is optional.
Step 9 — Sequence of Operation
A. Continuous 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−sec delay before relay opens.
B. 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−sec delay
before fan relay opens.
C. 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−sec delay before fan relay opens.
D. Electric Heat or Emergency Heat Mode
Thermostat closes R to W. W energizes electric heat relay(s) which
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.
THERMOSTAT
RED
R
GRY
G
BRN
C
WHT
W
2
WHT
BLU
E
VIO
L
O
Y
FAN HUMIDIFIER
115V M
Fig. 19 − Wiring Layout of Humidifier to Heat Pump
8
FAN COIL
HEAT PUMP
(CONTROL)
(CONTROL)
R
R
G
C
C
W
2
W
3
E
W
2
O
Y
RELAY
HUMIDISTAT
A95294