Carrier PF4MNX User Manual

PF4MNX: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
Install traps in the condensate lines as close to the coil as possible.
(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" (25 mm) for every 10' (3 m) of length. Consult
local codes for additional restrictions or precautions.
Accessories
Humidifier
Connect the humidifier and humidistat to the fan coil unit as shown in
Fig. 19 and Fig. 20. The cooling lockout relay is optional.
A03003
Fig. 18 – Condensate Drain
Sequence of Operation
Continuous Fan
Thermostat closes the R to G connection. G energizes the fan relay on
the PCB which completes the circuit to the indoor blower motor. When
G is de-energized, there is a 90-second delay before the relay opens.
A95294
Fig. 19 – Wiring Layout of Humidifier to Heat Pump
A95295
Fig. 20 – Wiring Layout of Humidifier to Fan Coil
with Electric Heat
Cooling Mode
Thermostat energizes R to G, R to Y, and R to O (heat pump only). G
energizes the fan relay on the PCB which completes the circuit to the
indoor blower motor. When G is de-energized, there is a 90-second delay
before the fan relay opens.
Heat Pump Heating with Auxiliary Electric Heat
Thermostat energizes R to G, R to Y, and R to W connections. G
energizes the fan relay on the PCB which completes the circuit to the
indoor blower motor. W energizes the electric heat relay(s) which
completes the circuit to the heater element(s). When W is de-energized,
the electric heat relay(s) open, turning off the heater elements. When G
is de-energized there is a 90-second delay before the fan relay opens.
Electric Heat or Emergency Heat Mode
Thermostat closes R to W connection. W energizes the electric heat
relay(s) which completes the circuit to the heater element(s). Blower
motor is energized through the normally-closed contacts on the fan relay.
When W is de-energized, the electric heat relay(s) opens.
Start-up Procedures
Refer to outdoor unit Installation Instructions for system start-up
instructions and refrigerant charging method details.
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED 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)
R
G
C
E
L
O
Y
THERMOSTAT
R
R
C
O
Y
G
C
W
2
W
2
W
2
W
3
E
FAN COIL
(CONTROL)
HEAT PUMP
(CONTROL)
RED
GRY
BRN
WHT
WHT
BLU
VIO
HUMIDISTAT
RELAY
FAN HUMIDIFIER
115V
M
CAUTION
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in poor unit performance
and/or product damage.
Never operate unit without a filter. Factory authorized filter kits may be
used when locating the filter inside the unit. For those applications
where access to an internal filter is impractical, a field-supplied filter
must be installed in the return air duct system.
R
G
W
Y
THERMOSTAT
R
G
W
2
W
3
E
C
FAN COIL
(CONTROL)
C
Y
AIR COND.
HUMIDISTAT
FAN HUMIDIFIER
115V
RED
GRY
WHT
WHT
BLU
VIO
BRN
M

Carrier PF4MNX Specifications

General

Brand	Carrier
Model	PF4MNX
Category	Air Handlers
Language	English