Micro-Air, Inc.
Page 21
EasyTouch 2.5 Operations Manual
Rev 1.0 8/27/14
(4.4°C). This is necessary to protect the condenser coil from freezing. Systems
configured with electric heat will be allowed to run the MOISTURE Mode heat
cycle regardless of the inside temperature.
11.1.16 Auto Fan Speed Temp Differential (1-3°F or 0.5-1.5°C;
2°F/1°C
)
This parameter sets the incremental differential (with cumulative steps) between the inside
temperature and the set point temperature at which the automatic fan speed will increment to
the next speed. Note that there is 1°F (or 0.5°C) hysteresis in the auto fan speed differential
to prevent the speed from changing if the room temperature if fluctuating between two
adjacent values. Please note that the Set Point Differential (see section 11.1.14) also affects
the automatic fan speeds. See Table 2 below for an example of how the automatic fan
speeds will behave when the Set Point Differential is 2°F (default) and the Auto Fan Speed
Temp Differential is 2°F (default).
Table 2
– Automatic Fan Speed Temp Differential Example
Fan Speed
Inside
Temp
Increasing
Temp ↑
Decreasing
Temp ↓
SP+7
High
High
SP+6
High
High
SP+5
High
High
SP+4
Med
High
SP+3
Med
Med
SP+2
Low
Med
SP+1
Low/Off
Low
SP
Low/Off
Low/Off
11.1.17 Humidity Sensor Control Limit (FX2 CW only, 45-85% RH;
60% RH
)
This parameter selection is available whenever the EasyTouch is plugged into an FX2 circuit
board with the Humidity control or FAMU daughterboard option and a combo
temperature/humidity sensor is plugged into the daughterboard’s INTAKE jack. It will be
grayed out whenever EasyTouch is plugged into any other type of FX2 or FX1 circuit board or
if the combo sensor is not plugged in. Also, humidity control only applies for CW control
operation only.
When the appropriate hardware and mode of operation is detected, EasyTouch will
automatically enable humidity control in concert with temperature control whenever executing
a cooling cycle in either AUTO or COOL Modes. Cooling will continue once the set point
temperature is satisfied until the inside temperature drops to 1° below the set point. If the
optional Electric Heat option is enabled (see section 11.1.7), electric heat will be turned on in
concert with cooling in order to maintain the inside temperature (dry bulb) while the cooling
cycle continues to dehumidify the cabin. The cooling cycle will terminate once the inside
temperature set point and this Humidity Sensor Control Limit have been satisfied.
11.1.18 DX/CW Mode Selection (Set by Jumper / DX Override / CW Override;
Set by Jumper
)
This parameter determines how EasyTouch determines the type of air conditioning system to
which it is connected. When this parameter is set to its default, "Set by Jumper", EasyTouch
determines whether the system is DX or CW based upon the “Cut for Chill” jumper on the
FX1 or FX2 main circuit board. When the jumper is cut, CW operation is in effect, and when
the jumper is not cut, DX operation is in effect. If at any time the control mode needs to set
regardless of the state of the jumper, setting this parameter to
“DX Override” or “CW
Override” will force EasyTouch to use the corresponding control mode.
