Greenheck Microprocessor Controller v3.0 (469690) - Manual (Page 3)

3
UNIT SET POINTS
The cursor always begins in the upper left corner of the display.
__Supply air low limit alarm
when supply is less than:
35.0°F
Alarm delay: 030s
Supply air low limit alarm
when supply is less than:
32.0°F
Alarm delay: 030s
__Supply air low limit alarm
when supply is less than:
32.0°F
Alarm delay: 030s
Use the up and down buttons to scroll through the display screens. The
cursor must be in the upper left corner of the display to scroll through the screens.
Press to move the cursor down for parameter adjustment.
Use the keys to adjust the parameter up or down. Press to move the
cursor to the next parameter, or to the upper left corner.
When finished, make certain the cursor is in the upper left corner. If the cursor is not in
the upper left corner, the changes made will not be saved. (The cursor must be in the
upper left corner to enable screen advancement).
If an alarm occurs, the buttom will glow red, and a buzzer will sound if a remote display panel is connected to the
controller (if enabled).
**ALARM**
B1 SENSOR ERROR
OUTSIDE TEMPERATURE
ALARMED@-hr:min.mm/dd
…ALARM OPTIONS…
Press UP to review.
Press Esc to exit.
Press ALARM to RESET
SUPPLY AIR AL: Indicates a loss of airflow in the supply fan Alarm & Shutdown
EXHAUST AIR AL: Indicates a loss of airflow in the exhaust fan Alarm & Shutdown
DIRTY WHEEL AL: Indicates a buildup of pressure across the energy recovery wheel Alarm
WHEEL ROTATION AL: Indicates a wheel rotation failure Alarm
DIRTY FILTER AL: Indicates a buildup of pressure across the filters Alarm
COMPRESSOR TRIP AL: Indicates a high or low refrigerant pressure Alarm & Compressor Shutdown
AC LOCKOUT AL: Indicates either the low pressure or high pressure switch are open Alarm & Compressor Shutdown
SUPPLY LOW LIMIT AL:
Indicates a discharge temperature lower than the supply low limit
set point
Alarm & Shutdown
MB1 FAIL: Indicates a failure of the outside air temperature sensor Alarm
MB2 FAIL: Indicates a failure of the supply air temperature sensor Alarm
MB3 FAIL: Indicates a failure of the after cooling coil air temperature sensor Alarm
Example of parameter adjustment
Example of alarms
List of possible alarms
Step 1: Press the Alarm button once. This will disable the buzzer and
display which alarms have occurred.
Step 2: Scroll down through the alarm screens if more than one has occurred.
Use the arrow buttons or alarm button to scroll through the alarms.
Step 3: Note which alarms occurred and at what time.
Step 4: Scroll down until the “Alarm Options” screen is displayed.
Step 5: Press the Esc button to exit without resetting the alarms.
In this mode the unit will remain operational, as long as the alarm is
non-fatal.
Non-fatal alarms = dirty filters, sensor failure…
Fatal alarms = airflow loss…
Step 6: Press the Alarm button to reset the alarms. If the alarm button
stops glowing red, the alarm has been cleared. No action is required.
(Sometimes a sensor can jump out of range for a short period of time,
causing an alarm. The sensor is probably OK, as long as the sensor
does not continually alarm and the displayed value looks reasonable).
Step 7: If the alarm signals again, the problem still exists and action needs to
be taken. Fix the condition that has caused the alarm.
OR