Staged Air Volume (Sav™) With Variable Frequency; Drive - Carrier WeatherExpert 50LC 07 Series Service And Maintenance Instructions

If one or more alarms are present and there has been no keypad ac-
tivity for at least 5 minutes, the Alarms menu displays and cycles
through the active alarms.
You can also navigate to the Alarms menu at any time.
Clearing Alarms
Once the alarm has been identified and the cause has been re-
moved (e.g. replaced faulty sensor) the alarm can be cleared from
the display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the (Enter) button. ERASE? displays.
3. Press the (Enter) button. ALARM ERASED displays.
4. Press the (Menu up/Exit) button to complete the action
and return to the previous menu.
NOTE: If the alarm still exists after clearing it, it is redisplayed
within 5 seconds.
Staged Air Volume (SAV™) with Variable Fre-
quency Drive
The Staged Air Volume (SAV) system utilizes a Variable Fre-
quency Drive (VFD) to automatically adjust the indoor fan mo-
tor speed in sequence with the unit's ventilation, cooling and
heating operation. Per ASHRAE 90.1 2010 standard section
6.4.3.10.b, during the first stage of cooling operation the SAV
system will adjust the fan motor to provide 66% of the design
airflow rate for the unit. When the call for the second stage of
cooling is required, the SAV system will allow the design air-
flow rate for the unit established (100%). During the heating
mode, the SAV system will allow total design airflow rate
(100%) operation. During ventilation mode, the SAV system
will operate the fan motor at
VFD and Fig. 49 for the VFD location.
speed. See Fig. 48 for the
66%
Fig. 48 — Variable Frequency Drive (VFD)
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