Aerco BENCHMARK 2500DF User Manual page 106

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
FAULT INDICATION
AIRFLOW FAULT
DURING PURGE
AIRFLOW FAULT
DURING RUN
Page 106 of 234
05/21/2014
CHAPTER 8 – TROUBLESHOOTING GUIDE
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
PROBABLE CAUSES
1. Blower not running or running too slow.
2. Defective Blocked Inlet switch.
3. Blockage in air filter or Blocked Inlet
switch.
4. Blocked blower inlet or inlet ductwork.
5. No voltage to Blocked Inlet switch from
C-More Control Box.
6. PROBABLE CAUSES from 3 to 12 for
AIRFLOW FAULT DURING IGNITION
apply for this fault.
1. Blower stopped running due to thermal
or current overload.
2. Blocked Blower inlet or inlet ductwork.
3. Blockage in air filter or Blocked Inlet
switch.
4. Defective Blocked Inlet switch.
5. Combustion oscillations.
6. PROBABLE CAUSES from 3 to 16 for
AIRFLOW FAULT DURING IGNITION
applies for this fault.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
1. Start the unit. If the blower does not run check the blower solid state
relay for input and output voltage. If the relay is OK, check the blower.
2. Start the unit. If the blower runs, turn off unit and check the Blocked
Inlet switch for continuity. Replace the switch if continuity does not
exist.
3. Remove the air filter and Blocked Inlet switch and inspect for signs of
blockage. Clean or replace as necessary.
4. Inspect the inlet to the combustion blower including any ductwork
leading up to the combustion blower for signs of blockage.
5. During the start sequence, verify that 24 VAC is present between
each side of the switch and ground. If 24 VAC is not present, refer
fault to qualified service personnel.
6. See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW FAULT
DURING IGNITION.
1. Check combustion blower for signs of excessive heat or high current
draw that may trip thermal or current overload devices.
2. Inspect the inlet to the combustion blower, including any ductwork
leading up to the combustion blower, for signs of blockage.
3. Remove the air filter and Blocked Inlet switch and inspect for signs of
blockage, clean or replace as necessary.
4. Verify that 24 VAC is present between each side of the switch and
ground. If 24 VAC is not present at both sides, replace switch,
5. Run unit to full fire. If the unit rumbles or runs rough, perform
combustion calibration.
6. See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW FAULT
DURING IGNITION.
Phone: 800-526-0288
CORRECTIVE ACTION
OMM-0099_0A
GF-145