MICRO-AIR EasyTouch - Set Point & Humidity Settings

Micro-Air, Inc. Page 19 EasyTouch Operations Manual
Rev 3.0 4/3/17
10.1 Air Sensor Fault (DX & CW, immediate lockout)
Main Screen Display: “FAULT SENSOR”
Status Screen Display: “FAULT INSIDE SENSOR”
Fault History Display: “SENSOR IN”
The EasyTouch can utilize one of 3 different temperature sensors for its Inside Temperature display
and use for control purposes:
 Built-in Display Temperature Sensor
 Alternate Air Temperature sensor plugged into the main FX1/FX2 control board
 Cabin Combination Temperature/Humidity sensor plugged into the “INTAKE” jack on the FX2
Humidity Option Daughterboard (rev G1 and older, if equipped)
 Cabin Combination Temperature/Humidity sensor plugged into the ALT. AIR / RH” jack on the
FX2 (rev J and newer) “.
Normally, the inside temperature sensor selection is determined automatically. (See section 12.1.16
for details on how to select the Inside Temperature sensor.) If a specific sensor is selected and it
malfunctions, or all of the potential inside temperature sensors have malfunctioned, the Air Sensor
Fault will be declared. Depending on which temperature sensor is required, replacing the failed
external temperature sensors or replacing the display itself may be necessary to remedy the problem.
10.2 FAMU Sensor Faults (FAMU only, immediate lockout)
FAMU Screen Display: “FAULT INTAKE SENSOR” or “FAULT EXHAUST SENSOR”
Status Screen Display: “FAULT INTAKE SENSR” or “FAULT EXHST SENSR”
Fault History Display: “SENSOR IN” or “SENSOR EX”
When FAMU is selected as the System Type (see section 9), both an intake and exhaust combination
temperature/humidity sensor need to be installed into the “OUTSIDE / RH” and “ALT. AIR / RH” jacks,
respectively, at all times. If either of these sensors fails to provide temperature and relative humidity
information, one of these faults will be declared. Check and replace the sensors as necessary, with
only approved types.
10.3 High Pressure Fault (DX & FAMU DX only, contributes to lockout count)
Main Screen Display: “FAULT HIGH PS”
FAMU Screen Display: “FAULT HIGH PRESSURE”
Status Screen Display: “FAULT HIGH PRES”
Fault History Display: “HIGH PRES”
The High Pressure Fault occurs whenever the system’s high pressure switch opens during
compressor operation or whenever it is open just before compressor start-up.
1. If the high pressure switch is open while the compressor is off, the most likely cause is an open
connection in the pressure switch itself.
2. If the high pressure switch opens while the compressor is operating in COOL mode, the most
likely cause is poor seawater flow or a fouled condenser.
3. If the high pressure switch opens while the compressor is operating in HEAT mode, the most
likely cause is poor air flow through the evaporator, possibly due to a clogged air filter.
10.4 Low Pressure Fault (DX & FAMU DX only, contributes to lockout count)
Main Screen Display: “FAULT LOW PS”
FAMU Screen Display: “FAULT LOW PRESSURE”
Status Screen Display: “FAULT LOW PRES”
Fault History Display: “LOW PRES”
The Low Pressure Fault occurs whenever the system’s low pressure switch opens during compressor
operation and remains open for at least 10 minutes, or whenever it is open just before compressor
start-up.