Micro-Air, Inc.
Page 26
EasyTouch 2.5 Operations Manual
Rev 1.0 8/27/14
Figure 15
– CW Operational Settings Menu Screen
Refer to Table 4 for a quick reference to the DX Operational Settings. Refer to the sections that
follow for further details on each setting.
Table 4
– CW Operational Settings
No.
Page Description
Factory
Default
Parameter Range
1
1
Water Valve Force Open
Off
Off / On
2
Water Temp Differential
10°F/6°C
5-25°F or 3-14°C
11.3.1 Water Valve Force Open (OFF/ON;
OFF
)
This parameter opens the water valve to bleed air from the system. Setting this parameter to
ON forces the valve to open for 4 hours. If the control is turned on or if AC power is
interrupted during this 4-hour period, this valve override feature is canceled. The valve can be
returned to normal operation at any time by changing this parameter setting back to OFF
manually.
11.3.2 Water Temp Differential (5-25°F or 3-14°C;
10°F/6°C
)
This parameter sets the temperature differential between ambient air temperature and inlet
water loop temperature at the air handler. For example, the default setting of 10°F allows the
valve output to be energized, opening the water valve, when the water temperature is at least
10°F less than ambient temperature in cooling mode and at least 10°F greater than the
ambient temperature in the heating mode. Hysteresis is also applied so that the valve
remains open if the water temperature moves back toward the ambient temperature during a
cooling or heating cycle. This hysteresis equals ½ of the parameter setting (e.g. 5°F). Also,
this same hysteresis is applied to disable the use of the electric heater if the water
temperature is hot enough during a heating cycle. Careful selection of the temperature
differential can fully utilize the ship’s heating and cooling resources. See Figure 16 below for
a graphical explanation of this parameter and how it affects the operation of the valve and
electric heater outputs.
