9
Marvair MPC-10 PDS/Manual, 09/2020 New
time/date that the alarm occurred, and the current status of the alarm. To get rid of the alarm the user must
fix the problem and acknowledge the alarm using the acknowledge button in the bottom right. To hide this
screen the user can press the "X" in the top right-hand corner, to return to this screen press the alarm indicator
shown below in the Alarm Indicator section. The different Status are shown below:
1.
I - Incoming, the alarm is currently active
2.
O - Outgoing, the alarm occurred at the time specified but was later fixed
3.
A - Acknowledged, the alarm has been acknowledged by the user
4.
IA - Incoming & Acknowledged, the user has acknowledged the alarm however the alarm is still active
Alarm Indicator
The alarm indicator will appear in the header of the HMI when there is
an unacknowledged alarm. The number at the bottom of the indicator
represents the number of incoming unacknowledged alarms. If the alarm
indicator shows "0" then there is an outgoing alarm that has not been
acknowledged. In this scenario the user would need to acknowledge the
alarm to get rid of the alarm indicator. By pressing the alarm indicator,
you can open or close the alarm window.
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IMPORTANT
Be sure that the crankcase heater (if used) has been energized for at least 24 hours before
starting the unit(s). Double-check all electrical connections before applying power. Air
conditioners with scroll compressors running on 3Ø power must be checked for proper rotation
during the initial start-up. Please refer to the Installation & Operation manual for determining
if the 3Ø compressors are rotating correctly. Incorrect rotation can damage the compressor and
may not be covered by the warranty.
Checking the Cooling Cycle
Procedure:
1.
On the parameters page (F2) verify that the cooling stage differential is 1ºF and the anti-short cycle is 3
minutes (default values).
2.
Make note of the temperature in the room and then press the thermostat button.
3.
Increase the cooling setpoint above the room temperature and decrease the heating setpoint down to
35ºF.
4.
Change the thermostat mode to auto.
5.
Slowly decrease the cooling setpoint below the room temperature. When the setpoint temperature is 1
degree below the room temperature the first stage cooling will come on. The lead unit will display cooling
as the mode on the home screen. Continue decreasing the cooling setpoint until all stages are on (2
stages per dual circuit unit and 1 stage per single circuit unit).
6.
To stop cooling, slowly increase the cooling set point to a temperature higher than the room temperature.
Note: The fan purge allows the indoor fan to run for 90 seconds (by default) after the compressor is off. This
operation provides a small improvement in system rated efficiency.
Checking the Heating Cycle
Procedure: (Applies only to air conditioners with resistance elements)
1.
From the main screen, increase the heating set point to a setting higher than room temperature. The fan
will start immediately followed by the electric resistance heater 5 seconds later.
2.
To test additional units, continue to increase the heating set point until all units are on, in heating mode.
3.
To stop heating, slowly decrease the heating set point to a temperature lower than room temperature.
