Burnham Apex APX399 Installation, Operating And Service Instructions page 106

Xii. Troubleshooting
C.
Help Screen Faults
indication
Sequencer
Setup
Flashing
Boiler Size
Setup
Flashing
D.
Help Screen Diagnostic Features
indication
i
Lockout History 1 of 10 (newest)
Supply High Limit
>
<
When happened Current
Status
Running Lockout
Run Time Hour
50 50
For Service Contact:
CONTRACTOR NAME
CONTRACTOR ADDRESS 1
CONTRACTOR ADDRESS 2
PHONE NUMBER
E.
Active Fault Screen Faults
indication
Limit String Status
Sensor Status
i
Supply Sensor 180 F Normal
Return Sensor 768 F Shorted
Stack Sensor 024 F Open
Outdoor Sensor 45 F Normal
Header Sensor None
4-20mA Input 4 mA Normal
Rate Limit
i
Rate Limits
Active Rate Limiter:
High Stack Temp Rate Limit
Active Rate Override:
Burner Control Rate Override
106
(continued)
Condition
This alarm is active if the slave boiler has lost communication with the Sequence Master. Check
the following:
Sequencer
- RJ 45 peer-to-peer network disconnected
Setup
- Sequencer Master was Enabled and then Disabled
Fault
- Master's Boiler has been powered down.
- To clear fault restore communication or cycle power
Boiler Boiler size setting may not match actual boiler size.
Size The Boiler size setting determines min, max and light-off blower speeds. Incorrect boiler size can
Fault cause hazardous burner conditions and improper operation that may result in PROPERTY LOSS,
PHYSICAL INJURY, OR DEATH.
Refer to Page 92 for boiler size setting instructions.
Lockout History is stored in a first-in, first-out basis. Each History file is stored with boiler run hour of when the
lockout occurred.
The "When happened" and "Current" provide:
- "Current" is the run hour and status the boiler just finished.
- "When happened" is the run hour and status when the lockout occurred.
The user is given the contact information of the responsible service provider. Refer to page 96 for data entry
instructions.
Condition
The Limit String Status screen shows the faulty safety limit. A contact icon, either "open" or
"closed", graphically represents each safety limit. The "closed" contact icon is steady; the "open"
contact icon is blinking. For example, the screen shown to the left illustrates a "closed" Air
Pressure Switch contact and an "open' Auto Reset High Limit contact. The Auto Reset High Limit
Limit String
is causing the boiler to stop firing.
Fault
NOTE: Since the limit string items are wired in series, all limits downstream of the "open" limit will
also appear on the screen as "open" (blinking) icons regardless of whether or not they are actually
open.
The Sensor Status screen shows the status of all sensors. Possible states include:
None: Feature requiring this sensor has not been selected.
Normal: Sensor is working normally.
Shorted: Sensor is shorted or is defective.
Sensor
Open: There is a break in the wiring between the Control and the sensor or the sensor is
Fault
defective
Out of Range: Sensor is defective or is being subjected to electrical noise.
Unreliable:
When a sensor fails "opened" or "shorted" the value is changed to reverse video (background
black and value white) "024" or "768" respectively to indicate that there is a fault with the sensor.
The following messages appear when the firing rate is limited or reduced to help avoid a lockout.
Refer to lockout section for potential corrective action.
- High Stack Temperature Limit
- High Supply Temperature Limit
High Stack
- High Differential Temperature Limit
Temperature
The following messages appear as part of a normal start and stop sequence:
Rate Limit
- Minimum Modulate (normal start/stop sequence)
- Forced Modulation (normal start/stop sequence)
- Burner Control Rate (normal start/stop sequence)
- Manual Firing Rate ( User selection)
Possible Cause
Warning!
Possible Cause
Possible Cause
Sensor is defective or is being subjected to electrical noise.