Service Mode Screen 1 – Service Filters; Service Mode Screen 2 – Service Desiccant; Display Mode; Service Messages - Gardner Denver DGH Series Instruction Manual

7. Controller – Level 2
7.9.1.15 Alarm Mode Screen 12 – Right Tower, Upper
Sensor (Thermistor) Over-Range
ALARM
RIGHT TOWER
UPPER SENSOR
OVER-RANGE
7.9.1.16 Alarm Mode Screen 13 – Right Tower, Lower
Sensor (Thermistor) Under-Range
ALARM
RIGHT TOWER
LOWER SENSOR
UNDER-RANGE
7.9.1.17 Alarm Mode Screen 14 – Right Tower, Lower
Sensor (Thermistor) Over-Range
ALARM
RIGHT TOWER
LOWER SENSOR
OVER-RANGE
7.9.1.18 Alarm Mode Screen 15 – Alarm Drain 1
ALARM
DRAIN 1
7.9.1.19 Alarm Mode Screen 16 – Alarm Drain 2
ALARM
DRAIN 2
7.9.1.20 Alarm Mode Screen 17 – Alarm
ALARM
LEFT TOWER
DRYING
OUTLET DEW POINT
7.9.1.21 Alarm Mode Screen 18 – Alarm
ALARM
RIGHT TOWER
DRYING
OUTLET DEW POINT

7.9.2 Service messages

There are two service levels (normal and severe) as described
in Program Mode. Each service level has preset time intervals
for servicing the filters, desiccant, and valves. Time continues
to accumulate as long as power is supplied to the controller,
whether the controller is switched on or off.
7. Controller – Level 2
When a service time interval expires, the controller operates as
follows.
•
The service LED blinks and the appropriate service
message is shown on the text display. (See 7.9.1)
•
When the service interval for filters has expired the three
filter LEDs also blink. NOTE: If the dryer has 1 or 2 filter
monitors, the timer for filter service is disabled. When the
filter monitor(s) sends an alarm signal (change filter) to the
Level 2 Controller, the controller displays the same LEDs
and messages it would if the timer for filter service had
expired.
•
The dryer continues to cycle normally. NOTE: The LEDs
for the valves, pressure switches, and desiccant
towers are not used for service indication (as in the
Level 1 Controller).
To extinguish the service LED and clear the service message
from the text display, go to Program Mode and reset the
appropriate service timer. If a filter monitor is installed, reset the
monitor to clear the Service LED.
The following text display is shown for each service message.
Replacement or repair of the affected item may or may not be
necessary. The service reminders are used to schedule routine
evaluation of the operational status of key components.
7.9.2.1 Service Mode Screen 1 – Service filters
SERVICE DRYER
FILTERS
Check filter Delta-P gauges and ensure that drains are
functioning properly. Inspect pilot air filter element. Check
filter monitors, if equipped.
7.9.2.2 Service Mode Screen 2 – Service desiccant
SERVICE DRYER
DESICCANT
Check moisture indicator or outlet dew point and inspect
mufflers for excessive dusting.
7.9.2.3 Service Mode Screen 3 – Service valves
SERVICE DRYER
VALVES
Ensure that valves are cycling properly. Check for switching
failure alarms and adjust purge pressure. Check for leaks.

7.10 Display Mode

•
Display Mode is active when the user exits Program Mode
or Setup Mode (unless MANUAL cycle was selected in
Setup Mode) and no alarms are active.
•
The LEDs for the valves, pressure switches, and desiccant
towers operate in the same manner as in the Level 1
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