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14
Check system wiring to be sure the User Interface is powered and
connections are made A to A, B to B, etc. and wiring is not
shorted. Mis- wiring or shorting of the ABCD communications
wiring will not allow successful communications. Correcting
wiring faults will clear the code and reestablish communications.
Shorting or mis- wiring the low voltage system wiring will not
cause damage to fan coil control or to User Interface but may cause
the low voltage fuse to open.
STATUS CODE 46, BROWNOUT CONDITION:
If the secondary voltage of the transformer falls below 15VAC for
a period exceeding 4 seconds, Status Code 46 will be displayed on
STATUS LED. If system includes a non- communicating outdoor
air conditioner or heat pump, the User Interface will command the
fan coil to turn off Y output controlling compressor .
When secondary voltage rises above 17VAC for more than 4
seconds, the brownout condition is cleared and normal system
operation will resume subject to any minimum compressor off
delay function which may be in effect. Brownout does not affect
blower or electric heater operation.
STATUS CODE 5 3, OUTDOOR AIR TEMPERATURE
SENSOR FAULT:
If an OAT sensor is found at power- up, input is constantly checked
to be within a valid temperature range. If sensor is found to be
open or shorted at any time after initial validation, Status Code 53
will be displayed at amber STATUS LED.
Check for faults in wiring connecting sensor to OAT terminals.
Using an Ohmmeter, check resistance of thermistor for a short or
open condition. If thermistor is shorted or open, replace it to return
the system to normal operation. If fault is in the wiring
connections, correcting the fault will clear the code and return the
system to normal operation.
NOTE: If fault condition is an open thermistor or a wiring
problem that appears to be an open thermistor and the power to the
fan coil control is cycled off, the fault code will be cleared on the
next power- up but the fault will remain and system operation will
not be as expected. This is because on power- up, the fan coil
control cannot discern the difference between an open sensor or if a
sensor is not installed.
F. Emergency Heating and Cooling Modes
Fan coil control can provide emergency heating or cooling using a
common heat/cool thermostat in the event that there are no system
communications, fault is in User Interface and no replacement is
immediately available.
To activate these modes, the thermostat and outdoor unit must be
wired as a common heating/cooling system to fan coil control
RGWYOC terminals.
NOTE: These emergency modes do not provide the level of
comfort and efficiency expected by the consumer and should only
be activated when User Interface cannot be replaced immediately .
Procedure 10 — FE4A, FE5A Fan Coil Sequence of
Operation
The FE4A, FE5A Fan Coil is designed for installation with a
communicating User Interface. This fan coil will not respond to
commands provided by a common thermostat except under certain
emergency situations described in Procedure 9 - Start Up and
Troubleshooting.
The User Interface uses temperature; humidity and other data
supplied from indoor and outdoor system components to control
heating or cooling system for optimum comfort. The fan coil will
be commanded by User Interface to supply airflow and, in the case
of a non- communicating outdoor unit, Air Conditioner or Heat
Pump control. The fan coil will operate blower at requested airflow
for most modes.
The nominal requested airflow will be 350 cfm per ton of nominal
cooling capacity as defined by outdoor unit size. Actual airflow
request will be adjusted from nominal using indoor and outdoor
temperature and indoor humidity data to optimize the system
operation for occupant comfort and system efficiency . Refer to
User Interface literature for further system control details.
Airflow during electric heater operation must be greater than a
minimum level for safe operation. If User Interface instructs fan
coil to turn on electric heat and the requested airflow is less than
the minimum value required for safe operation of installed heater,
the fan coil control will override requested value with the value
shown in Table 2, FE4A, FE5A Fan Coil Airflow Delivery Chart
- - Electric Heating Modes.
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Disconnect all power to unit before servicing field wires or
removing control package. The disconnect (when used) on
access panel does not disconnect power to the line side of
disconnect, but does allow safe service to all other parts of
unit. If unit does not have a disconnect, disregard the
foregoing. Instead, make sure that a disconnecting means is
within sight from, and is readily accessible from, the unit.
Disconnect all electrical power to unit before performing any
maintenance or service on it.
!
WARNING
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace air filter each month or as re-
quired.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean as necessary. An in-
spection port is provided on all A- coil delta plates. Remove
plastic plug to inspect.
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.
Consult Fan Coil Service Manual available from equipment
distributor for maintenance procedures.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
Using the Owner’s/User Manual furnished in outdoor unit, the
installing technician should explain system operation to the
consumer with particular emphasis on indoor fan coil operation
sounds and filter maintenance.
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