FMC5X, FMC5Z: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
The A2L Detection Sensor is attached to a wiring harness that connects
the sensor to the control board. Refer to Fig. 8 and Fig. 9 for low voltage
field connections between the control board and the thermostat. All
control wires are labeled with the wire function and landing point.
Leak Dissipation System Self-Test
Power on the unit and verify proper functioning of equipment. The green
LED on the control board should be steady (Fig. 3). If flash codes are
present, see Table 2.
A230606
Fig. 9 – Control Board LED
Ensure that the fan coil is able to meet the minimum required dissipation
mode airflows. These required minimum airflow rates during
Dissipation Mode are listed in Table 3. They are based on the total
system refrigerant charge quantity.
START-UP
Refer to outdoor unit Installation Instructions for system start-up
instructions and refrigerant charging method details.
SEQUENCE OF OPERATION
The following sequence of operation is based on units installed with
ECM\PSC motor and Time Delay Board (TDB). For units with ECM
motor, the off-delay is programmed into the motor. Follow Table 2,
ECM Motor Speed Taps & the corresponding blower off delays for each
speed tap. PSC models are factory wired with TDB active. Follow Fig. 6
to disable blower off time delay. When wired in this configuration no
blower off-delay will occur in any mode.
LEAK DETECTION SYSTEM is installed on indoor unit. Unit must
be powered except for service. Continuous air circulation required for
proper functioning. Unit must be powered except for service. This unit
is equipped with electrically powered safety measures. To be effective,
the unit must be electrically powered at all times after installation, other
than when servicing.
The refrigerant leakage sensor can only use the factory model or the
specified model indicated in the corresponding manual.
The R-454B refrigerant leakage sensor must be used to activate the
refrigerant shut-off device, the alarm device, incorporated circulation
airflow or other emergency controls, which shall give an electrical
signal at a predetermined alarm set point in response to leaked
refrigerant.
The location of leakage sensors shall be chosen in relation to the
different installation scenarios. Please refer to the indoor unit
installation manual for specific requirements.
The installation of the refrigerant leakage sensor shall allow access for
checking, repair or replacement by an authorized person.
The refrigerant leakage sensor shall be installed so its function can be
verified easily.
The refrigerant leakage sensor shall be protected to prevent tampering
or unauthorized resetting of the pre-set value.
To be effective, the refrigerant leakage sensor must be electrically
powered at all times after installation, other than when servicing.
If the refrigerant leakage sensor detects a refrigerant leak, the fan will
be turned on to the maximum, the compressor will stop running. You
should immediately leave the leak area and notify a professional for
handling.
The service life of the refrigerant sensor is 15 years, and it should be
replaced after the service life or if the sensor is determined to be faulty
during the service life.
Table 6 – Control Board Test Functions
LED Status Description
Steady ON Normal Operation
OFF Power Supply Failure
Steady Flashing Dissipation Mode Active
3 Flash / Cycle A2L Sensor Error
4 Flash / Cycle A2L Sensor Communication Error
8 Flash / Cycle A2L Sensor Over Service Life
Table 7 – Required Minimum Dissipation Mode Airflows,
based on Total System Refrigerant Charge Quantity
Total
System
Charge (lb)
Minimum Required
Dissipation Airflow
(CFM)
Total
System
Charge (lb)
Minimum Required
Dissipation Airflow
(CFM)
5 133 16 426
6 160 17 452
7 186 18 479
8 213 19 505
9 239 20 532
10 266 21 559
11 293 22 585
12 319 23 612
13 346 24 639
14 372 25 665
15 399
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