FHP AHP 641-224, Руководство пользователя, Страница: 15 / 42

Freeze Protection:
The unit shall shut down and generate an alarm upon receiving a freezestat status.
Fan:
Constant Volume
In the occupied mode, the fan shall run continuously or cycle with the compressor(s) depending
on fan mode settings. In the unoccupied mode, fan cycles as required for unoccupied heating
and cooling setpoints while in night setback.
Variable Frequency Drive
On units equipped with a factory or field installed Variable Frequency Drive (VFD) the controller
will command the VFD signal to maintain a particular ( User Definable) value of Static pressure,
this is typical on VAV applications with discharge air control requirements.
Zone Humidity:
If specified the controller has the capability to monitor and control the zone humidity via the hot
gas re-heat option.
There are two hardware options for humidity control:
Hot Gas Re-Heat Valve On/Off:
This valve is controlled based on a 60% relative humidity
setpoint (User Definable) and will only be energized once the temperature set points are
satisfied, this valve is a two position valve and therefore is an on/off operation.
Alarms will be provided as follows:

High Zone Humidity: If the zone humidity is greater than 75% (adj.).

Low Zone Humidity: If the zone humidity is less than 35% (adj.).
The controller prioritizes the sensible load and therefore if temperature rises or decreases
during the re-heat operation the controller will switch to heating or cooling operation.
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