FMA4X, FMA4P: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
3. Use UL listed conduit and conduit connector for connecting
line-voltage leads to unit and obtaining proper ground. If conduit
connection uses reducing washers, a separate ground wire must be
used. Grounding can also be accomplished by using the ground lug
provided in the control box. Power wiring may be connected to
either the right or left sides or top of unit. Knockouts of 7/8"
(22 mm) dia. are provided for connection of power wiring to unit.
Some heater sizes may require a conduit larger than the 7/8"
opening; in this situation the high-voltage connection opening
should be enlarged to fit the conduit.
When removing the knockouts for electrical connections, an
opening in the insulation should be cut to fit the opening. The cut
edge of the insulation should be reinforced with foil tape to prevent
fraying. The foil facing and insulation shall not be removed beyond
the knockout opening size.
4. Install plastic grommet packed with unit in hole for low-voltage
wires.
5. Connect low-voltage leads to thermostat and outdoor unit. See
and
as well as the outdoor unit wiring label.
Select Proper Blower Speed
Before operating unit, be sure that the proper blower speed has been
selected. Fan speeds are selected manually.
To change the fan speed on model FMA4P:
• Factory default fan speed is medium; fan-motor red wire connected to
fan relay No. 4.
• For high speed, connect fan-motor black wire to fan relay No. 4.
• For low speed, connect fan-motor blue wire to fan relay No. 4 and
fan-motor red wire to fan relay No. 6.
• Always connect the unused fan-motor wire to the dummy terminal
block.
• When selecting the proper airflow, refer to
below to choose
proper blower speeds for cooling and heating.
To change the fan speed on model FMA4X:
• At the motor connection plug connect the green wire to the desired
motor tap number indicated on the motor plug (
).
• For the electric heat fan speed selection connect the white wire to the
desired motor tap number indicated on the motor plug. See
factory default settings.
TXV (FMA4X Only)
NOTE:
The TXVs are preset at the factory and do not need adjustment
for reliable operation.
START-UP
Refer to outdoor unit Installation Instructions for system start-up
instructions and refrigerant charging method details.
SEQUENCE OF OPERATION
NOTE:
The following sequence of operation is based on units installed
with PSC motor and Time Delay Board (TDB). For units with ECM
motor, the off-delay is programmed into the motor. Follow
ECM Motor Speed Taps & the corresponding blower off delays for each
speed tap.
CONTINUOUS FAN
Thermostat closes R to G. G energizes and completes circuit to indoor
blower motor. When G is de-energized, there is a 90’s blower off-delay.
COOLING MODE
Thermostat energizes R to G, R to Y, and R to O (heat pump only). G
energizes and completes indoor blower motor. Y energizes outdoor unit
(O is energized for heat pump). When cooling call is satisfied, G is
de-energized, there is a 90s blower off-delay.
HEAT PUMP HEATING MODE
Thermostat energizes R to G and R to Y. G energizes and completes
circuit to indoor blower motor. When heating call is satisfied, G is
de-energized, there is a 90s blower off-delay.
HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
Thermostat energizes R to G, R to Y, and R to W1. G energizes and
completes circuit to indoor blower motor. W1 energizes electric heat
relay(s) which completes circuit to heater element(s). When W1 is
de-energized, electric heat relay(s) open, turning off heater elements.
When G is de-energized there is a 90s blower off-delay.
ELECTRIC HEAT OR EMERGENCY HEAT MODE
Thermostat energizes R to W1. W1 energizes electric heat relay(s) which
completes circuit to heater element(s). Blower motor is energized
through normally closed contacts on fan relay. When W1 is
de-energized, electric heat relay(s) opens, there is no blower off-delay,
(units with ECM motor will have blower off-delay based on motor speed
tap selection).
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equipment
failure, it is essential that periodic maintenance be performed on this
equipment. The only required maintenance that may be performed by the
consumer is filter maintenance. See
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace air filter each month or as required.
2. Inspect cooling coil, drain pan, and condensate drain each cooling
season for cleanliness. Clean as necessary.
3. Inspect blower motor and wheel for cleanliness each heating and
cooling season. Clean as necessary.
4. Inspect electrical connections for tightness and controls for proper
operation each heating and cooling season. Service as necessary.
NOTE:
The installing technician should explain system operation to the
consumer with particular emphasis on indoor fan coil operation sounds
and filter maintenance.
Table 2 – FMA4X ECM Motor Speed Taps
Tap
Delay-off
Time (s)
19
25
31
37
Tap 1
30
-
-
-
-
Tap 2
90
Default
-
Default
-
Tap 3
30
-
-
-
-
Tap 4
90
-
Default
-
Default
Tap 5
30
-
-
-
-
Table 3 – Filter Sizes
Unit Size
Filter Size In. (mm)
18, 24
16x20x1 (406x508x25)0
30, 36
20x20x1 (508x508x25)
