Hired-Hand Farm Hand Series: Data Shuttle Launch Pad - Manual (Page 19)

Part No. 4801-0165 Rev 7-02 Data Shuttle Launch Pad 17
The small red arrows show the
Pressure Differential used to
calculate the High and Low
Pressure Limits.
Tunnel Target Pressure - In tunnel mode, this is the target pressure that will be
maintained if and only if SWX 4 of the Tunnel Switches is ON. See the Vent Master
Owners manual for instructions on setting this switch.
13.4 RAMPING Window
This window applies to: Î The Vent Master
Ramping allows you to set a band of pressure to be
maintained, taking into account the OUTSIDE
temperature. If the outside temperature is warm, it
will allow taking in a large volume of slow moving
warm air (low static pressure), but when outside air is
cold, the Vent Master will adjust to allow a low
volume of fast moving cold air (high static
pressure). This window is used to set the
High and Low Outside Temperature
Limits and adjust the Target Pressure for
each Low and High Outside temperature
limit when ramping. The Target Pressure
is the static pressure the system tries to
maintain within the limits of the Pressure
Differential. The Pressure Differential is the
same as set in the General window. See
Section 10.1 of this manual.
The High Pressure Limit is the Target
Pressure plus half of the Pressure
differential. The Low Pressure Limit is the
Target Pressure minus half of the Pressure
Differential
Use Ramped Values - A check box is provided to either enable or disable the use of
Ramped Values.
13.5 ALARMS Window
This window applies to: Î The Vent Master
The Alarms Window sets the Static Pressure
for the Cycle Alarm and the limits for the High
an Low pressure alarms. The following
parameters can be set with this window:
Cycle Alarm Static Pressure - The cycle
alarm is a very important alarm in that it will
warn if the timer fans failed to operate. The
controller will look for a pressure surge which
would normally be caused when the timer fans
turn on. If this pressure surge is not sensed
within the timer period specified, the controller
will signal the alarm system, thus triggering an
alarm.
Disable Cycle Alarm – Checking this box