Micro-Air, Inc.
Page 25
EasyTouch 2.5 Operations Manual
Rev 1.0 8/27/14
NOTE:
When using the alternate air temperature sensor, the De-Ice Cycle behavior is
the same regardless of whether this parameter is set to
Enabled with 5°F/3°C
Sensor Differential
or
Enabled with 7°F/4°C Sensor Differential
.
The De-Ice Cycle algorithm initiates periodic compressor shutdowns every 10 minutes if the
inside temperature is at or below 69°F (20°C). The lower the temperature, the longer the
compressor shutdown will last. In addition, the De-Ice Cycle algorithm will perform brief
reverse cycle runs (with the fan purposely turned off) if the cooling cycle runs for 40 minutes
without any cooling progress or if the cooling cycle runs for more than 60 minutes regardless
of cooling progress.
Enabled with 5°F/3°C Sensor Differential
– When the built-in display temperature sensor is
in use, the De-Ice Cycle algorithm as described above operates with the minimum threshold
temperature at 74°F or 23°C. De-Ice Cycle operation with the alternate air sensor is the
same and is unchanged. Use this setting for typical conditions and a normal installation.
Enabled with 7°F/4°C Sensor Differential
– When the built-in display temperature sensor is
in use, the De-Ice Cycle algorithm as described above operates with the minimum threshold
temperature at 76°F or 24°C. De-Ice Cycle operation with the alternate air sensor is the
same and is unchanged. Use this setting for more extreme conditions and an installation
where ice is still forming on the evaporator when using the default setting.
11.2.5 Pump Sentry (OFF / 100-150°F or 40-65°C, OFF)
EasyTouch can be equipped with an optional Service sensor that is used to monitor the
temperature of the condenser coil. See section 6.3 for more information on how to install the
Service sensor. This Pump Sentry parameter setting is the maximum Service temperature
allowed during normal compressor operation. If at any time during a cooling (or heating)
cycle the Service temperature exceeds this parameter setting, the system will be shut down
and the EasyTouch will declare a PUMP (Sentry) fault. The Pump Sentry fault will persist
until the Service sensor temperature drops below this parameter setting or for a minimum of 2
minutes, whichever occurs first. Thereafter, the compressor will be restarted. See section
9.5 for more information on the Pump Sentry fault.
11.2.6 Pump Operate Mode (CYCLED / CONTINUOUS;
CYCLED
)
This parameter setting controls the behavior of the pump output. The pump output can either
be set to cycle with the compressor or run continuously. Cycled operation is recommended
in order to maximize the life of the pump itself and air conditioner condenser coil.
11.2.7 Low Pressure Detection (Set by Jumper / Disabled;
Set by Jumper
)
This parameter setting control the detection of the Low Pressure switch input on the main
FX1 or FX2 circuit board. When the parameters is set to
“Set by Jumper", the Low Pressure
switch input is enabled if the "LP" jumper on the main board is cut or removed. If the jumper
is not cut, the Low Pressure switch input remains disabled. If at any time the Low Pressure
switch input needs to be disabled regardless of the state of the jumper, setting this parameter
to “Disabled” will cause the input to always be ignored. Micro-Air does not recommend
disabling the Low Pressure switch input on systems specifically designed to use Low
Pressure switches as this can endanger the equipment under certain conditions. See section
9.3 for more information on the Low Pressure Fault.
11.3 CW Operational Settings
To access the CW Operational Settings, go to the Main Menu, select Control Parameters, and then
select CW Operational Settings. The CW Operational Settings Menu consists of 2 items on 1 page
(screen) as shown in Figure 15.
