SPX Hankinson HHE Series Instruction Manual page 37

• One of two things will happen upon exiting Setup Mode.
1. The controller will switch to Display Mode if DEMAND
CYCLE or FIXED CYCLE was selected.
2. The controller will switch to Test Mode if MANUAL
CYCLE was selected.
8.8.1 Setup Mode Screen 1 – Select the dew point class.
ISO 8573 DEW PT
2: -40°C/-40°F
• Press to scroll through the choices:
1: -73°C/-100°F
2: -40°C/-40°F
3: -20°C/-4°F
4: +3°C/+38°F
• When finished, press
Screen 2.
8.8.2 Setup Mode Screen 2 – Select the cycle type.
CYCLE TYPE
DEMAND CYCLE
• Press to scroll through the choices: DEMAND CYCLE,
FIXED CYCLE, and MANUAL CYCLE. NOTE: DEMAND
CYCLE is not available if Class 1 was selected in the previous
screen.
• When finished, press
Screen 3 (if the dryer has electric drains) or exit Setup Mode
(if the dryer does not have electric drains).
8.8.3 Setup Mode Screen 3 – Test the drains.
TEST DRAIN ?
NO
• Press to toggle between NO and YES.
• Press to continue.
a. If NO was selected, the controller immediately exits
Setup Mode.
b. If YES was selected, the controller energizes Drain 1
and Drain 2 for 4 seconds before exiting Setup Mode.
8.9 Alarm & Service Mode
Alarm & Service Mode is active when the controller is in Display Mode.
It is not active in Program Mode, Setup Mode, or Test Mode.
NOTE: Alarm messages have priority over Service messages. Service
messages have priority over Display messages. When an alarm occurs,
Display Mode is disabled and only the alarm message is shown. When a
service message is active, it takes the place of the corresponding service
reminder in the Display Mode (e.g. "HOURS TO SERVICE FILTERS:
XXXX" would be replaced by "SERVICE DRYER FILTERS").
8.9.1 Alarm messages
Alarm messages are displayed on a first-out basis with one exception.
The alarm caused by an open pressure switch at the end of the
regeneration cycle, takes precedence over existing alarms. See
8.9.1.1 (3).
to save the selection and move to
to save the selection and move to
8.9.1.1 Pressure Switch Alarms
There are three alarms for each tower that are triggered by the tower
pressure switches. These alarms can occur in either the fixed or
demand cycle. Following is a brief description of each alarm.
1. Left or right tower, drying, low pressure
• Pressure switch open during drying cycle
2. Left or right tower, regenerating, high pressure
• Pressure switch closed while purge valve is open (after an
initial time delay)
3. Left or right tower, regenerating, low pressure
• Pressure switch open at the end of the regenerating cycle
8.9.1.2 Thermistor Alarms
There are two alarms for each of the four thermistors. These alarms
can only occur in the demand cycle. Following is a brief description
of each alarm.
1. Left or right tower, upper or lower sensor, over-range
• Temperature above 150°F (66°C)
• Thermistor circuit shorted
2. Left or right tower, upper or lower sensor, under-range one
cycle
• Temperature below 40°F (4°C)
• Thermistor circuit open
8.9.1.3 Optional Device Alarms
1. Electric Drains with Alarm Contacts
• Each drain has alarm contacts that connect to the Level 2
Controller.
• If the contacts open, then a drain alarm is indicated.
2. Humistat (humidity sensor) - AUX 1 input
• The humistat has alarm contacts that connect to the
Level 2 controller.
• If the contacts open, the outlet dew point alarm is
indicated.
When an alarm condition occurs, the controller operates as follows.
• The alarm LED blinks and the appropriate alarm message is
shown on the text display.
• The dryer continues to cycle normally (see below for exception).
NOTE: The LEDs for the valves, pressure switches, and
desiccant towers are not used for alarm indication (as in the
Level 1 Controller).
• If the alarm condition clears for one cycle, then the alarm LED
stops blinking (LED on); the alarm message continues to be
displayed.
• Exception: If the alarm is caused by the condition in Section
8.9.1.1.3, then the cycle stops. Once the alarm condition is
corrected, the alarm LED stops blinking (LED on) and the cycle
continues normally; the alarm message continues to be displayed.
• In the demand cycle, the control switches to a fixed 10 minute cycle
when the alarm LED begins blinking. Control switches back to
the selected demand cycle after the alarm condition clears. This
applies to pressure switch, thermistor, and outlet dew point alarms,
but not to drain alarms.
• When the alarm condition is corrected, press the reset button to
extinguish the alarm LED and to clear the alarm message from
the text display.
— 35 —