Alarms; Alarm Log; Alarm Conditions - Airstream EXPERT PN110 User Manual

EXPERT PN110

11. ALARMS

When an alarm occurs, the controller lights
up the alarm pilot light and posts the alarm
condition into the alarm log menu. The fol-
lowing table gives a list of all possible alarm
conditions.
Another alarm situation occurs when power to
the controller fails. In this case, the alarm relay
is activated. When the alarm relay is activated,
the normally open contact (
Display Meaning
Low Temp Alarm Low temperature alarm
High Temp Alarm High temperature alarm
Low Pressure Low static pressure alarm
Alarm
High Pressure High static pressure alarm
Alarm
Probe #1-6 A temperature probe is
Defect defective
Outside Probe Outside probe is defective
Defect
Pot. Inlet Defect The inlet is defective
Water Spill Water consumption too high
Lo/Hi Water The water consumption of
Usage the last 24h is too low or to
high compared to the water
consumption of the 24h
that precede.
SP Probe Defect The static pressure sensor is
defective
RH Probe Defect The humidity probe is
defective

11.1. Alarm Log

1. Select:
» ALARMS
2. The alarm log is displayed on scren. Use
the down-arrow key to make it scroll down.

11.2. Alarm Conditions

Temperature Alarms
The diagram below shows how temperature
alarms are detected.
When the average room temperature ex-
ceeds the high temperature alarm setting,
a high temperature alarm is set off. When
the average room temperature decreases
34
EXPERT PN110 rev.23
below the low temperature alarm setting, a
low temperature alarm is set off. Although
these settings are entered by the user as ab-
solute values, they are defi ned based on the
room set point. They are thus automatically
adjusted if the set point changes.
The situation is slightly different when the
outside temperature is greater than the room
set point. In this case, the outside tempera-
ture becomes the reference point (instead of
using the set point as a the reference). This
means an alarm is set off when the room
) closes.
temperature reaches Outside Temperature + High
Alarm Off set (the offset being the difference
between the high alarm temperature setting
and the set point). A third parameter, called
the Critical Temperature, is defi ned to continue
monitoring the indoor temperature for high
temperatures. When the indoor temperature
reaches the critical high temperature (defi ned
as an absolute value), an alarm is set off.
Alarm
Limits
Hi T°
limit
Set
Point
Lo T°
limit
Temperature Alarms in Clean Mode
The controller can monitor low temperature
alarms when it is in clean mode. If this alarm
condition is used, the controller sounds an
alarm when the temperature falls below low
alarm limit that is associated to the clean
mode.
The low alarm limit used in clean mode is re-
lated to the clean mode set point; this means
the alarm limit is automatically adjusted when
the clean mode set point changes.
Static Pressure Alarms
The controller can sound an alarm when the
static pressure (SP) level exceeds high or low
pressure limits for a certain period of time.
Detection of
Temperature Alarms
Hi T°
alarm
Room T°
Water Spill Alarm
A water spill alarm is triggered when the
water consumption exceeds a user-defi ned
amount of water within a 15-minute delay.
This alarm limit ranges from 0 to 10,000 gal-
lons (or liters) per 15 minutes.
The alarm will stay ON for 15 to 30 min-
utes after a water spill situation is re-
solved. This is the time it takes for the
controller to gather the new consumption
values required to restart monitoring
water spill alarms properly.
Water Consumption Alarms:
the percent difference in water consumption
between the last 24-hour period and the pre-
vious 24-hour period is greater than a given
maximum value, an alarm is set off.
Water Consumption
Previous 24h Last 24h
The high and low water consumption alarm
limits are defi ned as follows:
• Case #1: If more water was consumed in
the last 24 hours than in the 24 hours that
precede, the controller will determine how
much more water was consumed and will
convert this value in percent. If the surplus
(in %) is higher than the "High Alarm" limit,
the controller will set off an alarm.
Last 24h - Previous 24h x 100 ≥ Hi Alarm
Previous 24h
• Case #2: If less water was consumed in
the last 24 hours than in the 24 hours that
precede, the controller will determine how
much less water was consumed and will
convert this value in percent. If the defi cit (in
%) is higher than the "Low Alarm" limit, the
controller will set off an alarm.
Previous 24h - Last 24h x 100 ≥ Lo Alarm
Previous 24h
Before it can start monitoring the water
consumption alarms, the controller needs
to gather consumption data for 48 hours
in a row (no consumption alarm can be
detected within this 48-hour delay):
When
Time
Now