Micro Air Corporation FX-1 User manual

Contents
FX-1 Operations Manual
Micro Air Corporation
124 Route 526
Allentown, NJ 08501
I NTRODUCTION ........................................................................................................................................................... 1
B ASIC O PERATION ...................................................................................................................................................... 2
S YSTEM O VERVIEW .................................................................................................................................................... 3
O PERATOR C ONTROLS AND D ISPLAY P ANEL ..........................................................................................................4 & 5
D
UAL B UTTON F UNCTIONS ......................................................................................................................................... 5
S
PECIAL B UTTON F UNCTIONS ...................................................................................................................................... 6
M
ODES OF O PERATION ........................................................................................................................................6 & 7
A WAY M ODE ............................................................................................................................................................ 7
F AN M ODES .............................................................................................................................................................. 7
E NTERING THE P ROGRAM M ODE ................................................................................................................................. 8
P
ROGRAMMING ........................................................................................................................................................... 9
D
EFAULT P ROGRAM T ABLE ....................................................................................................................................... 10
H
IGH AND L OW F AN S PEED L IMITS ........................................................................................................................... 11
R ESET M EMORIZED D EFAULTS .................................................................................................................................. 13
M EMORIZE N EW P ROGRAM D EFAULTS ....................................................................................................................... 13
F
AIL - SAFE AND F AULT H ANDLING C ODES ........................................................................................................ 13 & 14
F ACTORY S ELF -T EST ................................................................................................................................................ 15
S PECIFICATIONS ...............................................................................................................................................15 & 16
S ERVICE T OOLS ....................................................................................................................................................... 17
W IRING D IAGRAM .................................................................................................................................................... 18
I
NSTALLATION O VERVIEW ......................................................................................................................................... 19
Copyright © 1997 Micro Air Inc., All Rights Reserved
Nopartofthispublicationmaybereproduced,translated,storedinaretrievalsystem,ortransmittedonanyform
orbymeanselectronic,mechanical,photocopying,recordingorotherwisewithoutpriorwrittenconsentbyMicro
Air Inc.
Every precaution has been taken in the preparation of this manual to insure its accuracy. However, Micro Air
assumes no responsibility for errors and omissions. Neither is any liability assumed for damages resulting from
the use of this product and information contained herein.

FX-1 Operations Manual
Page 1Revision: 06 04 / 08 / 09
INTRODUCTION
The FX-1 Control is designed for use with all direct expansion, reverse cycle air conditioning
systems. FX-1 has a universal power supply that operates on 115, 230, 50 or 60 Hz AC power. FX-
1 includes the following standard and optional features:
Standard Features
User friendly 4 button display panel requires no manual for basic operation.
Five volt logic and micro controller located in the display.
3-digit 7-segment display panel indicates °Fahrenheit or °Celsius.
Room temperature sensor integral in the display panel.
Automatic fan speed reduction as set point is approached.
Six [6] programmable manual fan speeds.
17 programmable parameters for custom installations.
AC voltmeter to protect valuable electrical components.
High and low Freon pressure sensor inputs.
Away Mode for controlling relative humidity.
De-Icing cycle to prevent evaporator coil icing.
Programmable multiple compressor staging delays.
Universal AC power supply.
Nonvolatile memory retains settings without batteries.
Programmable display brightness control for night use.
Optional Features
The following optional items can be added by plugging
the device into the appropriate jack and making the nec-
essary programming changes.
Outside air temperature sensor… No programming necessary.
Alternate air temperature sensor… No programming necessary.
Custom paintable display panels.
Pump Guard water sensor… Program setting of P-9 required.
This manual is designed to provide all the information necessary to insure proper instalation and
operation of the FX-1. Poor installation and misunderstood operating parameters will result in
unsatisfactory performance and premature failure of the FX-1.
Read This Manual Completely Before Proceeding !
If you require assistance prior to or during the installation of the FX-1 call Micro Air at 609-259-
2636 or Fax your questions to Micro Air at 609-259-6601.
The FX-1 is covered under existing Micro Air Warranty Policy. Incorrect installation, neglect and
system abuse are not covered under Micro Air's warranty policy.

FX-1 Operations Manual
Page 2Revision: 06 04 / 08 / 09
BASIC OPERATION
POWERBUTTON Press the power button once to toggle the unit to the on mode. Press the power
button again to toggle the unit to the off mode.
UP BUTTON Momentarily press and the
set point will appear in the temperature
display. The set point increases one degree
each time the up button is pressed and
released.
DOWNBUTTON Momentarilypressand
release to display the set point. The set
pointisdecreased onedegreeeach timethe
down button is pressed and released.
SELECT BUTTON The select button is
used to select one of 4 Operating Modes.
Press and release to advance to the next
mode. Continue to press and release until
the desired Operating Mode is reached.
ThemodeselectedisindicatedbytheMode
LED.
THREE DIGIT DISPLAY The inside
[supply]temperature isdisplayedwhenever thecontrol isturnedon. Thedisplay providesareadout
of the inside air temperature.
HEAT MODE LED The heat mode LED is lit when Heating is selected.
COOL MODE LED The cool mode LED is lit when the Cooling is selected.
AUTO LED The auto LED is lit when the Automatic Heating or Cooling Mode is selected. The
control will automatically switch to heating or cooling when this mode is selected.
AWAY MODE LED The away LED is lit when the Away Mode [ Rh Control ] is selected.
AUTO FAN SPEEDS The fan speeds are automatically reduced as the set point is approached.
FAN SPEED BAR GRAPH There are six [6] individual fan speed LED's. Each LED represents
one[1]fanspeed.Lowfan[1]is indicatedbyilluminating thefirstLED. Highfanspeedisindicated
by illuminating all six [6] LED's.
MANUAL FAN SPEEDS Manual fan speed settings are available via system programming. See
the first programming item on page 9.
OPERATING LED The system operating status [ compressor on or off ] is indicated by the
operating LED.

FX-1 Operations Manual
Page 3Revision: 06 04 / 08 / 09
OVERVIEW
FX-1 is a user friendly, easy to operate, programmable temperature control.
PresstheON/OFF buttononce toengagethe system.The Displayindicatesroom temperaturewhen
the system is on and the Display is blank when the system is off.
Press and release the Select Button until the desired Mode LED is illuminated.
Set the desired room temperature by pressing the up or down button. The set point can be viewed
by momentarily pressing and releasing the Up or Down Button.
Fan speed operation is automatic allowing fan speed to decrease as room temperature is ap-
proached. The fan speed decreases as the set point is approached. The fan will operate at low speed
when set point is satisfied. Manual fan speeds can be selected by entering the program mode and
selecting the desired manual fan speed. The fan will operate at the speed selected and will not
change speeds with room temperature. See page 9 of this manual for programming instructions.
The fan can be programmed to cycle on and off with demand, allowing the fan to run only when
coolingorheatingisrequired.Normallytheautomaticfanspeedoperationisreversedintheheating
mode, however, the fan can be programmed to operate the same as in the cooling mode.
NORMAL HEATING OR COOLING CYCLE
SelectCoolonlyandcoolingonlywillbesupplied.Thecabintemperaturewillbemaintainedwithin
2°F of the setpoint. Select Heat onlyandonly heating willbesupplied. The cabintemperaturewill
be maintained within 2 ° F of the set point.
SelectAutomatic andboth heatingandcoolingwillbesuppliedasrequired.While inthe Automatic
Mode FX-1 will maintain a two degrees Fahrenheit (2 °F) temperature variation. A four degree
swing is required to cause the unit to shift to the opposite mode. Once in a given mode, heating or
cooling, FX-1 will maintain a two degree differential.
When the Heating or Cooling demand is satisfied, the compressor cycles off and the Automatic Fan
returns to low speed. The fan speed will remain constant if Manual Fan Speed has been pro-
grammed. REVERSING VALVE OPERATION
The reversing valve is toggled to the opposite mode when heating or cooling is required to reduce
the compressor starting surge. The valve will only toggle to the opposite mode when a cooling or
heatingcycle iscalled forandifthesystemhasbeen offfor lessthan seventy-five(75) seconds.The
valve will also toggle if a cycle is interrupted from the display panel by pressing the power button
ON/OFF,orchangingthesetpoint.Unnecessaryvalvetogglinghasbeenlimitedtoreducereversing
valve noise. Valve toggling can be totally eliminated by programming the minimum compressor
staging delay at seventy-five seconds (75) or greater.
Power on reset, which occurs when the system is powered up, will always initiate a valve toggle.
Memory: FX-1 has nonvolatile memory which requires no batteries or any form of backup power.
When power is lost the operating parameters are retained indefinitely. When power is restored, the
control resumes operating as last programmed. All operating and programming parameters are
entered into nonvolatile memory instantly and are retained indefinitely.

FX-1 Operations Manual
Page 4Revision: 06 04 / 08 / 09
OPERATOR CONTROLS AND DISPLAY PANEL
Refer to figure 1 for the buttons locations and display functions listed on the following pages.
1.POWERBUTTON The power button is used to toggle between the onand offmodes. Press the
power button once to toggle the unit to the on mode. Press the power button again to toggle the unit
to the off mode.
2.DOWNBUTTON Momentarilypressandreleasethedownbuttontodisplaythesetpoint.Press
and release the down button to decrease the set point. The set point is decreased one degree each
time the down button is pressed and released. The lowest set point allowed is 55 ° Fahrenheit. The
down button is used in conjunction with the up button to display the outside air temperature when
the control is on. The down button is also used to reduce program values in the program mode.
3. UP BUTTON Momentarily press the up button and the set point will appear in the temperature
display. Press and release the up button to increase the set point one degree. The set point is
increased by one degree each time the up button is pressed and released. The highest set point
allowed is 85 ° F. The up button is used in conjunction with the down button to display the outside
air temperature when the control is on. The up button is also used to increase program values in the
program mode.

FX-1 Operations Manual
Page 5Revision: 06 04 / 08 / 09
4. SELECT BUTTON The select button is used to select one of the four operating modes. Press
and release the select button and the FX-1 will advance to the next mode. Continue to press and
releasetheselect buttonuntil thedesiredoperating modeis reached.Themode selectedisindicated
by the Mode LED, i.e., Cool, Heat, Automatic or Away Mode.
5. COOL MODE LED The cool mode LED will be lit when the Cooling
Mode has been selected.
HEAT MODE LED The heat mode LED will be lit when the Heat Mode
hasbeenselected.The heatmodeLED isalsolit whentheoptionalelectric
heat is installed and the heat mode is selected. Electric heater status, on or
off, is indicated by the Operating LED.
6. AWAY MODE LED The Away Mode LED will be lit when the Away
Mode has been selected. This mode is used to control moisture during
periods when the vessel is unoccupied.
7. READY LED The Ready LED is on whenever AC power is supplied to the control. The Ready
LED remains on when the control is in both the ON and OFF Modes.
8. THREE DIGIT SEVEN SEGMENT DISPLAY The inside air temperature is displayed in the
window whenever the control is turned on. The three digit 7 segment display provides a readout of
the inside air temperature which is located in the face plate. An optional alternate air sensor is
available for installations that cannot use the face plate sensor.
The display also indicates program information, fault codes and outside air temperature when the
optional outside air sensor is installed.
The display will momentarily indicate the set point when either the up or down button is pressed
and released.
When the control resumes operation after a power interruption all the display LEDs will turn on for
one second. This is a normal operating condition and is referred to as "Power On Reset".
9. FAN SPEED BAR GRAPH There are six [6] individual fan speed LED's in the Fan Speed Bar
Graph. Each LED represents one [1] fan speed. Low fan speed [1] is indicated by illuminating the
firstLED.Highfanspeedisindicated byilluminatingallsix[6] LED's.Anyofthesix [6]fanspeeds
available are displayed by illuminating the appropriate LED's.
10. OPERATING STATUS LED The Operating LED is on when the compressor is on and off
when the compressor is off. The Operating LED also indicates when the optional electric heater is
turned on. DUAL BUTTON FUNCTIONS
Up & Down Buttons… Press the up and down button together and the outside air temperature will
be displayed, providing the OPTIONAL OUTSIDE AIR TEMPERATURE SENSOR has been installed. No
programming is required. Press the UP & Down Buttons simultaneously, while in the program
mode, to set new custom programming defaults.
Power & Down Buttons… Simultaneously press the power and down buttons while viewing the
Service Fault History Log clears the fault History Log.

FX-1 Operations Manual
Page 6Revision: 06 04 / 08 / 09
SPECIAL BUTTON FUNCTIONS
Special button functions are implemented by pressing and holding a particular button while the
controls' AC power is turned on.
1. Service History Log… View the service history log by pressing and holding the select button
while turning on the AC power. Exit the service history log by pressing the power button once.
Clear the service history log by simultaneously pressing the power and down buttons.
2. Self Test Mode… Press and hold the power button while AC power is applied to enter the self
test mode. The self test is used to diagnose problems and test the air conditioning system. For
complete details see page 15 of this manual.
3. View Hour Meter… To view the compressor hour meter, press and hold the down button while
applying AC power. Maximum recorded time is 10,000 hours. The hour meter stops at maximum
(10,000hrs)andcanonlyberesetbyMicroAirCorporation.Thehourmeterfunctionsaredescribed
fully on page 17 of this manual.
MODES OF OPERATION
Off Mode
When the FX-1 is in the off mode, all control outputs are turned off. Program parameters and user
settings are saved in nonvolatile memory. The program mode can only be accessed from the off
mode. The power LED remains lit in the off mode.
On Mode
When the control is in the on mode, power will be supplied to the appropriate control outputs and
the display will indicate the current state of operation. The operating and program parameters
resume based on those stored the last time the unit was operating.
Cool Only Mode
When Cool LED is on, only the cooling systems are selected and operated as required. When the
temperature drops below the set point, the system will not automatically switch to the heating
mode. Cooling only is available for customers that do not want automatic cooling and heating
operation. Systems without reverse cycle heating can have an optional electric heater installed
should heating be required.
Heating Mode Only
When the Heat LED is on, only the heating systems are selected and operated as required. Should
the temperature rise above the set point, the system will not automatically switch to the cooling
mode. Heating only is supplied for customers that require the system to not automatically switch
from the heating to the cooling mode.

FX-1 Operations Manual
Page 7Revision: 06 04 / 08 / 09
MODES OF OPERATION
Automatic Mode
When the Automatic LED is on, both heating and cooling are supplied as
required. The heat and cool LEDs will be lit according to the mode
required. When the system requires compressor operation for heating or
cooling the Operating LED will turn on when the compressor is on.
Temperatureinagivenmodewillbemaintainedattwodegrees Fahrenheit
( 2 ° F ), however, a four degree difference is required to allow the control
to change modes. Once in a new mode, the temperature will remain within
two degrees Fahrenheit ( 2 ° F ) of the set point.
Away-Mode
While in the on mode, press the Select Button until the Away Mode LED
isilluminated.Thefirstcyclewillstartinoneminute.Everyfour(4)hours,
thefanis startedandair circulated forthirty (30) minutes.Duringthis time
theair temperatureissampled andentered intomemory. Thecoolingcycle
is started and continues until the temperature is lowered 2 ° F. The
compressor is allowed a maximum of one hour running time to reach the
desiredtemperature.Four (4) hours afterthe temperature is satisfiedorthe
compressor times out, the cycle is repeated. During the humidity cycle the
Operating LED is lit while the compressor is running.
FAN MODES
Automatic Fan Mode
FX-1 has six automatic fan speeds available. Speed six is high, three is
medium and one is low or the slowest speed. Automatic fan mode allows
the FX-1 to determine the required fan speed based on room temperature.
The closer the room temperature is to the set point, the slower the fan will
run.This permitsabalance betweenthe mostefficienttemperature control
and slower, quieter fan speeds. Automatic fan operation is the factory
default, however, manual fan speed control is available.
Manual Fan Mode
Program parameter one [1] is used to select one of the six (6) manual fan
speeds available. Six (6) is the fastest and one (1) represents the slowest
fan speed. Manual fan mode allows the user to select and maintain the
desired fan speed manually. When a manual fan speed has been selected,
the fan speed bar graph will indicate the speed selected by the number of
LED's lit. Select speed 3, for example, and the first 3 LEDs in the fan bar
graph will turn on. Manual Fan Mode is sometimes preferred when room
temperature is constantly changing due to varying heat loads.

FX-1 Operations Manual
Page 8Revision: 06 04 / 08 / 09
PROGRAM MODE
Program Mode Overview
The program mode is used to adjust the systems operating
parameters to suit the particular needs of individual users.
The program mode is also used to tailor the air-condition-
ing system for the most efficient operation within an
installation. Installation variables such as, ducting, sensor
location and system layout effect the perceived operation
of the overall system. The program mode allows the sys-
tem to operate as efficiently as possible under all condi-
tions. FX-1 is shipped with factory default settings which
are stored in permanent memory and can be recalled at any
time.
Warning
Severe electrical disturbances can sometimes upset the FX-1 operating
sequences. Operator confusion related to program parameters can also
cause, what seem to be, operational problems. Whenever there is any doubt
as to the proper operation of the controller, Factory Default Parameters
should be Re-initialized.
ENTERING PROGRAM MODE
The program mode can only be entered from the off mode. From the off mode and in
the following order, press the Select, Up, Down and the Select buttons. These buttons
havetobepressedandreleasedintheordergiven.Theletter"P"appearsinthedisplay.
The buttons have to be pressed in the sequence described. Remember "SUDS"… It's
the key to enter and unlock the program mode. The characters "P" then "P 1" followed
bytheparametersetting,appearinthedisplay.TheFX-1controlisnowintheprogram
mode. Exit the program mode, to the off mode, by pressing and releasing the power
button.
NOTE: The control will exit the program mode and return to the off mode if no
programming is attempted for one (1) minute.
Restore Memorized Default Settings
IMPORTANT ! The memorized default settings can be restored by entering the
programmodeandsettingP-17torSt.Exittheprogrammodeandthesoftwareversion
number appears in the display. The memorized default settings are restored and the
FX-1controlreturnstotheoffmode.Thesoftwareversionnumberisalwaysdisplayed
when you exit the program mode.

FX-1 Operations Manual
Page 9Revision: 06 04 / 08 / 09
USING THE PROGRAM MODE
Increment from one program parameter to the next by pressing the select button while in the
programmode. Press and release the select button to advance to the desired parameter. Use the up
anddownbuttonstochangetheprogramparametervalues.Theprogrammableparametersrange
from P-1 through P-17.
Up and Down Buttons
Theup anddownbuttonsareusedtoselectthedataorset thedesired limitsfor theparameter being
programmed.This methodisfollowed throughoutthe programmode, however,specialinstructions
are included for individual functions as require them.
Exiting the Program Mode
There are two methods to exit the program mode. Press the power button and the FX-1 control will
return to the off mode. Not pressing any buttons or attempting any program changes for sixty (60)
secondswillallowthecontroltoexittheprogrammodetotheoffmode.Anyprogrammingchanges
that were made while in the program mode will be memorized and put into operation when the
program mode is exited and the control is returned to the on mode.
Software Identification
The software version of the control is identified for one (1) second prior to the exit
from the program mode. The software identification number, i.e. ("A10") will appear
in the display for one second, then the control will return to the off mode.
Should there be any reason to contact Micro Air Corporation about the system or programming
the FX-1 be sure to have the software identification number and serial number of the system
available.
PROGRAMMING
P-1: Fan Speed Automatic or Manual
TheprogramvaluesallowedareA,followedbyone(1)throughsix(6).Select
"A"(factory defaultsetting)forautomaticfan speedsand thefanwilloperate
in conjunction with room temperature. The further the room temperature is
from set point, the faster the fan will run in the cooling mode. The fan speed
will gradually decrease as the set point is approached and the fan will run at
low speed (1) when the set point is satisfied. Select any one of six (6) manual
fan speeds available, for example, select three (3) and the fan will operate at
medium speed under all temperature conditions. When a manual fan speed
is selected the fan will always operate at the speed selected and will not vary
with room temperature.

FX-1 Operations Manual
Page 10Revision: 06 04 / 08 / 09
Programmable Parameters
There are seventeen (17) programmable parameters with their Factory Default Settings
listed in this section. The table below indicates what these parameters are, along with the permitted
values and the original Factory Default Settings.
Should any programming problems or confusion occur, reset the Memorized Default Settings by
entering the program mode and setting P-17 to rSt.
Program
Number
Description Default Range
P-1 Fan Speed Operation… Auto or Manual A = Automatic A = Auto
1 thru 6 Manual Fan Speeds
P-2 High Fan Speed Limit (arbitrary units) 85 65 - 95
P-3 Low Fan Speed Limit (arbitrary units) 55 30 - 64
P-4 Compressor Staging Time Delay 15 5 - 135 seconds
P-5 Temperature Sensor Calibration 0 Ambient ±
10° F
P-6
Failsafe Modes and Mnemonic
High Freon Pressure - - - HPF
Low Freon Pressurer - - LPF
Low AC Line Voltage - - LAC
3 = 4 Failures With
90 Second Restart
Delay. Manual Reset
is Required.
Off
1 = Continuous No Display
2 = Continuous W / Display
3 = 4 Failures Reset Required
P-7 Low AC Voltage Cut-Off 85 VAC (115vac)
185VAC (220vac) Off - 75 to 120 (115 vac units) Off - 175 to 220 (220 vac units)
P-8 De-Icing Cycle O O = Off
1 to 3 Minutes
P-9 Pump Sentry… Protects Pump and
Compressor FromLoss ofSea Water. OFF OFF
On = Select 100°F to150°F
P-10 Display Brightness Control
13 = Maximum 4 = Low
13 = Max imum
P-11 Display ° Fahrenheit or ° Celsius °F °F = Fahrenheit Displayed
°C = Cels ius Disp la ye d
P-12 Cycle Pump With Compressor or
Continuous Pump OFF = Cycle With Compressor OFF = Cycle with Compressor On = Continuous Pump
P-13 Reverse Fan Speeds During Heating Mode rEF = Reversed nor = Normal Fan Operation
rEF = Reversed Fan In Heating
P-14 Continous Fan or Cycle Fan with
Compressor con = Continuous Fan Operation CYC = Cycle Fan With Comp. con = Continuous Fan Operation
P-15 Reverse Cycle Heating or Electric Heat nor = Reverse Cycle
Heating nor = Reverse Cycle Heating ELE = Electric Heater Installed
P-16 Fan motor type selection… Shaded pole
or split capacitor. SP = Shaded Pole SP = Shaded Pole Fan Motor
SC = Split Cap. Fan Motor
P-17 Reset
Memorized Programming Defaults nor = Normal rSt = Reset Defaults

FX-1 Operations Manual
Page 11Revision: 06 04 / 08 / 09
P-2: High Fan Limit
The upper fan speed limit can be tailored to suit various motors and operating conditions. The high
fan limit is adjusted with the system installed and operational. The range of values are 56 through
85and representarbitrary units.Setting ahighernumber,resultsinahigherfanspeed,settinglower
numbers, lowers the high fan speed limit. Use the up and down buttons to select the desired high
fan speed limit. The factory default setting is eighty-five (85).
P-3: Low Fan Limit
The low fan limit determines the lowest output allowed for the low fan speed. The range of values
for the low fan speeds are 30 through 55, in arbitrary units. Use the up and down buttons to select
the desired low fan speed limit. Setting a higher number, results in a higher fan speed, setting lower
numbers, lowers the low fan speed limit. The factory default setting is 45.
IMPORTANT ! Once the high and low fan speed limits are set, the unit will automatically readjust
the remaining fan speeds to produce six (6) equally spaced in both the automatic and manual fan
speeds modes.
P-4: Compressor Staging Time Delay
The compressor staging delay is provided for installations where more than one system is being
operated from the same power source. Setting the staging delays at different intervals allows only
one compressor to start at a time. The units should be staged at least five (5) seconds apart. The
minimum delay is five (5) seconds and the maximum is one hundred thirty-five (135) seconds. The
factory default setting is 15 seconds.
P-5: Temperature Calibration
Use this feature to calibrate the air sensor within a range of ± ten (10) °F. Enter the program mode
and the ambient temperature appears in the display. Use the up and down keys to select the desired
offset.Thetemperatureinthe displaywillincreaseordecrease accordingtotheoffsetprogrammed.
The factory default setting is zero.
P-6: Fail-safe Level
The system can be configured for one of four fail-safe levels. Selecting OFF turns off all fail-safe
protection and mnemonic display codes. Level one (1) shuts down the system, allows the system to
restart after a 90 second delay and displays no failure code. Level two (2) shuts down the system
allows continual restarts after the 90 second delay and displays the appropriate mnemonic failure
code. Level three (3) operates the same as level two with the addition of a system shutdown after
four (4) consecutive failures… Manual reset is required to restart the system.
P-7: Low AC Voltage Cut-Off
FX-1 can be programmed to protect the system against sustained low AC line voltage conditions.
The compressor will be shut down and "LAC" flashed in the display if the line voltage goes below
the programmed value for more than ten (10) minutes. Programmable values are 75 VAC to 120
VAC for 120 volt units and 175 VAC to 220 VAC for 220 volt systems. The factory default is 85
VAC for 120 volt units and 185 VAC for 220 volt systems. NOTE: Low Voltage Protection can be
turned off by programming Off instead of selecting a voltage value.

FX-1 Operations Manual
Page 12Revision: 06 04 / 08 / 09
P-8: De-Icing Cycle
FX-1 is equipped with a De-Icing Cycle to prevent ice build up on the evaporator coil during
extended periods of cooling operation. Installation variables such as grille sizes, length of ducting,
insulation R factors and ambient temperatures determine the cooling run time required to achieve
set point. Customer usage may substantially increase run times by operating the system with the
hatchesand doorsopen. Programmingunrealisticsetpoint[55°F] andleaving thesalon dooropen
will usually cause the evaporator to ice up on warm muggy days.
De-Icing is accomplished by switching the reversing valve into the Heat Mode while the system is
cooling. The valve will remain energized for the programmed cycle time. The cycle is program-
mable from OFF through a period of 3 minutes. The factory default setting is zero [ Off ].
P-9: Optional Pump Sentry
FX-1canbeequippedwith anoptionaltemperaturesensorthat isusedtomonitorthe condensercoil
temperature. The sensor is plugged into the outside air sensor jack and parameter P-9 programmed
fora temperaturebetween 100and150°F dependingon seawater temperatureand thesystem type.
When the coil temperature rises above the programmed value the pump and compressor are shut
down and "PPP" is flashed in the display. The factory default is Off, no pump sentry installed.
P-10: Display Brightness Control
The display brightness can be adjusted to suit ambient cabin lighting conditions. The allowed
settings are four (4) to thirteen (13), with four (4) being the dimmest and thirteen (13) the brightest.
Typicallyadark cabinwill require asetting offouror five.Avery brightcabin willrequirea setting
of twelve or thirteen. The factory default setting is thirteen (13).
P-11: Fahrenheit or Celsius Selection
The unit can be programmed to display either Fahrenheit or Celsius. Programming °F selects
degreesFahrenheitandprogramming°C displaysdegreesCelsius. Thefactorydefaultsettingis °F,
Fahrenheit. When degrees Celsius (°C) is selected the readings are displayed in tenths, i.e. 22.2 °.
P-12: Cycle Pump With Compressor
Toincreasepumplifeandconserveelectricitythepumpcanbeprogrammedtocycleonandoffwith
the compressor. The pump can also be programmed to operate continuously whenever the system
ison.ToprogramthepumpforcontinuousoperationturnP-12On.Thefactory defaultisOff,which
cycles the pump with the compressor.
P-13: Reverse Automatic Fan Speeds During Heating
The automatic fan speeds can be reversed during the heating mode to improve heat output in cooler
climates. The fan speed is decreased as the temperature spread increases. The fan will speed up as
the set point is approached. Lowering the fan speed when the cabin is cold increases head pressure
and raises the supply air temperature. Increasing the fan speed as the set point is approached also
reduces unnecessary high pressure faults. The fan switches to low speed when the set point is
satisfied and the compressor cycles off. The fan can be programmed to operate the same as in
cooling by programming P-13 nor which represents normal fan operation during reverse cycle
heating. The factory default is rEF, which reverses the automatic fan speeds during heating.

FX-1 Operations Manual
Page 13Revision: 06 04 / 08 / 09
P-14: Cycle Fan with Compressor
The fan can be programmed to run continuously when the system is on or can be allowed to cycle
with the compressor. When cycled with the compressor, the fan will operate only when heating or
cooling is called for. To cycle the fan with the compressor select CYC which stands for cycle the
fan with the compressor. To operate the fan continuously select con which represents continuous
fan operation. The factory default is [con] continuous fan operation when the system is on.
P-15: Reverse Cycle or Electric Heat
Units not equipped with reverse cycle heat may have electric heater added. Electric heat requires
thecompressorbeturnedoffwhenheatingiscalledfor.Thereversingvalveoutputisusedtocontrol
the optional electric heating element contactor. The valve output relay can only carry 6 amps,
therefore, a heavy duty contactor must be installed to carry the heater current. Program parameter
ELE for the electric heat option. The factory default is nor which is normal reverse cycle heating.
P-16: Fan Motor Selection
There are two basic fan motor types, shaded pole and split capacitor. Each motor reacts differently
to speed control and each motor requires different timing for optimum fan speed control. The
default setting is "SP" which selects shaded pole motor type, however, "SC" should be selected
if a split capacitor type of fan motor is used in the system. Most direct expansion systems are
supplied with shaded pole type fan motors. The factory default is "SP" shaded pole motor type.
P-17: Reset Memorized Defaults
The default programming parameters can be reset by entering the program mode and selecting rSt.
Thiswillrestore the programmableparameters to thevaluesselected when thesystemwas shipped.
The program parameters listed on page 10 may be altered by Micro Air, the installing dealer or the
end user. Once New defaults are entered ( see page 5, dual button functions) and memorized the
NEW defaults will be reset. The original factory programmable parameters as listed on page 10 will
have to be restored manually.
Why Memorize New Defaults?
Once the desired programming changes have been made and the system tests satisfactorily, your
work can be saved as the new factory defaults. Your new defaults are initiated by simultaneously
pressing and releasing the up and down buttons prior to exiting the program mode. New defaults
can be initialized at any time by entering the program mode and following the above instructions.
Once new defaults have been initialized the control will revert back to the new defaults whenever
factory defaults are restored as described on pages 8 of this manual.
FAIL-SAFE AND FAULT HANDLING CODES
When a fault is detected FX-1 will display one of the following Mnemonic fault codes:
HPF… indicates high Freon pressure. 15 Second Delay… Ignored in Heat Mode.
LPF… Indicates low Freon pressure. There is a ten minute charge time delay.

FX-1 Operations Manual
Page 14Revision: 06 04 / 08 / 09
FAIL-SAFE AND FAULT HANDLING CODES
LAC… Indicates low AC line power
AAA…Indicates failed air sensor.Unit will not run until repaired.
PPP… Indicates the sea water pump has failed.
Fail-Safe
Therearefourlevelsof fail-safeprotectionincludingthefail-safeoffmode.Levelonemonitorsthe
sensors, takes appropriate action and allows continuous restarts after a 90 second delay… Doesnot
display the fault code. Level two works the same as level one, however, the appropriate fault code
mnemonic is displayed during the time-out between restarts. Level three is identical to level two
with the inclusion of a four successive failures lockout routine. After four consecutive failures the
system is shut down and a manual reset is required.
Lockout
Lockout occurs if P-6 is programmed for level 3 and four consecutive faults are detected within
a heating or cooling cycle. Lockout causes the system to shut down and flash the mnemonic fault
code. Lockout can only be cleared by turning the unit off, then on using the power button.
Fault Display
When a fault occurs the appropriate mnemonic code is flashed in the display. The flashing
mnemoniccanbe removedfrom the displayby pressingandreleasing the powerbutton to resetthe
control. Resetting the control does not solve the problem that caused the fault!
Failsafe
Level
Action Description of Action Taken
OFF All Protection
Turned Off
FAILSAFE PROTECTION LEVELS TURNED OFF:
Air Sensor Fault: Heating/Cooling Immediately Suspended; Normal
Operation Not Resumed Until Fault is Cleared. Air Sensor Fault Code
"FlashingDisplay" NO OTHER FAILSAFE PROTECTION
PROVIDED.
1
No Mnemonic Fault
Code Displayed
Continuous 90 Sec.
Re-Starts Allowed !
MINIMUM PROTECTION LEVEL:
All Actions Taken in Failsafe Protection Level "0" Plus: In Addition,
Continous 90 Second Compressor Restarts Allowed.
FAULT Mnemonic CODE NOT DISPLAYED
NO OTHER FAILSAFE PROTECTION PROVIDED.
2
Display Fault & Shut
Down Compressor
With Continuous 90
Second Delay
Between Restarts.
INTERMEDIATE PROTECTION LEVEL:
All Actions Taken in Failsafe Protection Level "0" & Level "1" Plus: In
Addition, The FAULT MNEMONIC CODE Message Will Be
Displayed With Continous 90 Second Compressor Restarts Allowed.
NO OTHER FAILSAFE PROTECTION PROVIDED.
3 Display fault & require manual reset
after 4 failures.
MAXIMUM PROTECTION LEVEL:
FAULT CODE MESSAGES ARE DISPLAYED and The Appropriate
Action is Taken According to The Problem Encountered.After 4
Consecutive Failures Manual Reset is Required.

FX-1 Operations Manual
Page 15Revision: 06 04 / 08 / 09
AUTOMATED FACTORY-SELF TEST PROGRAM
Self-Test Mode
The FX-1 software contains a self-test program to facilitate factory testing of the entire air-
conditioning system. Once the self-test mode is activated, the test cycle will continue until the AC
power is interrupted or the on/off button is pressed once which returns the system to the off mode.
Activate the self-test by pressing and holding the on/off button while turning on the AC power. Be
sure to continue to hold the button until the power on reset is completed… FX-1 is now in the self-
test mode.
Once activated the self-test software will continuously execute the following procedure:
1 - Turn on in the heat mode and supply heating for ten (10) minutes.
2 - Stop heating and run the fan only for five (5) minutes.
3 - Switch to cooling and continue cooling for ten (10) minutes.
4 - Stop cooling and run the fan only for five (5) minutes.
5 - Return to step one (1) and continue until interrupted.
The test mode will continue until the power is interrupted or the test is halted by pressing the on/
off button once. SPECIFICATIONS
SET POINT OPERATING RANGE........................................................................................... 55 ° F TO 85 ° F
AMBIENT TEMPERATURE OPERATING RANGE DISPLAYED ..................................................... 55 ° F TO 85 ° F
SENSOR ACCURACY ........................................................................................................... ± 2 °F AT 77 ° F
LOW VOLTAGE LIMIT 115 VOLT UNITS ...........................................................................................75 VAC
LOW VOLTAGE LIMIT 220 VOLT UNITS .........................................................................................175 VAC
LOW VOLTAGE PROCESSOR RESET .................................................................................................60 VAC
LINE VOLTAGE .....................................................................................................115 THROUGH 250 VAC
FREQUENCY ............................................................................................................................ 50 OR 60 HZ
FAN OUTPUT .............................................................................................................6 AMPS @ 115 VAC
FAN OUTPUT .............................................................................................................6 AMPS @ 230 VAC
VALVE OR HEATER OUTPUT...................................................................................... 1/4 AMP @ 115 VAC
VALVE OR HEATER OUTPUT...................................................................................... 1/4 AMP @ 230 VAC
PUMP OUTPUT ........................................................................................................... 1/4 HP @ 115 VAC
PUMP OUTPUT ........................................................................................................... 1/2 HP @ 230 VAC
COMPRESSOR OUTPUT ................................................................................................... 1 HP @ 115 VAC
COMPRESSOR OUTPUT ................................................................................................... 2 HP @ 230 VAC
MINIMUM OPERATING TEMPERATURE ...................................................................................................0 ° F
MAXIMUM AMBIENT OPERATING TEMPERATURE ................................................................................180 ° F
MAXIMUM RHCONDITIONS ..................................................................................... 99% NON CONDENSING
POWER CONSUMPTION ................................................................................................. LESS THAN 5 WATTS

FX-1 Operations Manual
Page 16Revision: 06 04 / 08 / 09
DIMENSIONS
DISPLAY PANEL ................................................................................................................ 3.75" X 3.75"
PANEL CUT OUT ............................................................................................................ 3.150" X 3.150"
CABLE LENGTHS
SELF CONTAINED DISPLAY CABLE.......................................................................................... 15' STANDARD
CENTRAL SYSTEM DISPLAY CABLE ........................................................................................30' STANDARD
ALTERNATE AIR SENSOR ........................................................................................................7' STANDARD
OUTSIDE AIR SENSOR ...........................................................................................................15' STANDARD
SYSTEM INPUTS
1 ..................................................................................... AMBIENT FACE PLATE AIR TEMPERATURE SENSOR
1 .............................................................................................................................HIGH FREON PRESSURE
1 ............................................................................................................................. LOW FREON PRESSURE
1 ................................................................................................ OPTIONAL ALTERNATE INSIDE AIR SENSOR
1 ........................................................................................ OPTIONAL OUTSIDE AIR TEMPERATURE SENSOR
1 .................................................................................. OPTIONAL PUMP SENTRY CONDENSER COIL SENSOR
NOTES: Custom cable lengths available on special request in 5 foot increments. Maximum length
of display cable is fifty ( 50 ) feet. Sensor cable lengths should be limited to 50 feet. The outside
air sensor,alternateairsensorandcondensercoilsensorare optionalitems andarenotincluded
with the standard control package.
Wheninstallingthe optional PumpSensor[ Pump Sentry] and theAlternateAir Sensor NoOutside
Air Sensor is available.
In order to continually improve and advance the FX-1 Control, Micro Air, Inc. reserves the right to
change this product's basic operation, specifications and design criteria without prior notice.

FX-1 Operations Manual
Page 17Revision: 06 04 / 08 / 09
SERVICE TOOLS
Hour Meter
Total compressor cycle time is saved in EEPROM every 6 minutes of continuous compressor
running time. Cycles less than 6 minutes will be discarded to conserve memory and allow the
most flexible hour-meter possible.
ToviewthehourmeterturnoffthepowerattheACbreakerandholdthedownbuttondepressed.
While depressing the down button, restore AC power. After the Power-On reset routine is
complete, the following will appear in the display:
1. The hour meter mnemonic [Hr] is displayed for
one [1] second.
2. The display blanks out for one second and then
displaystheThousandsunitsfor three[3]seconds.
3. The display blanks out for one [1] second and then displays the Hundreds units for three [3]
seconds.
4. The unit returns to the last operating state before power was removed.
The example shown is displaying eleven-hundred twenty-two [1,122] hours.
Maximum recorded time is 10,000 hours. The hour meter stops at maximum (10,000 hrs) and
can only be reset by Micro Air Corporation.
Service History
FX-1willrecordandrememberthelasteight(8)serviceproblemsorservicefaultsdetected.Each
timea faultis detected,a onehour timerisstarted.Duringthathourthesame recurringfaultwill
not be recorded. Should a different fault be detected during that hour, it will be entered into the
service history log.
The following events are entered into the service history log:
1. High Freon Pressure
2. Low Freon Pressure
3. Air Sensor Fault
4. Low AC Voltage
5. Pump or Loss of Sea Water Fault
To view the service log turn off the AC power and depress the select button. With the select
button depressed turn on the AC power. Once Power-On reset is completed, the display will
flash the most recent mnemonic for the fault detected, followed by the event number. To view
the other events detected press either the up or down buttons.
To exit the service history log press the power or the select button or wait 30 seconds without
pressing any buttons.
Theservicelogcanbeclearedbysimultaneouslypressingthepoweranddownbuttonswhileyou
are viewing the service log mode.

FX-1 Operations Manual
Page 18Revision: 06 04 / 08 / 09
FX-1WIRING DIAGRAM