1. Aerco Benchmark 2.0 Parts List
2. Aerco Benchmark Boilers
3. Benchmark 2.0 Boiler Parts
4. Aerco Boiler Troubleshooting
5. Aerco Benchmark 2.0 Manual

TROUBLESHOOTING

/dell-latitude-laptop-drivers.html. Benchmark 2.0 LN Boiler pdf manual download. Page 7 FORWARD Foreword The AERCO Benchmark 2.0 Low NOx (LN) Boiler is a modulating unit. It represents a true industry advance that meets the needs of today's energy and environmental concerns. Designed for application in any closed loop hydronic system, the Benchmark's modulating capability. Page 2 of 20 AERCO International, Inc.100 Oritani Dr.Blauvelt, New York 10913.Phone: 800-526-0288 AM1 AM Series Venting Application Guide GF-146-V TAG-00750B DISCLAIMER The information contained in this manual is subject to change without notice from AERCO. Jul 29, 2016  BC Safety Authority has been informed of seven ignition related incidents since 2011 involving Legacy AERCO Benchmark 1.5, 2.0 or 3.0 boilers in BC. These incidents were classified as “hard light-offs” or “delayed ignitions” and were described as a loud bang or pop during operation or start-up. A quick start-up and run of an Aerco Benchmark 2.0 Low NOx boiler. 100,000 BTU minimum fire 2,000,000 BTU maximum fire 87% - 98.6% efficiency depending on EWT and fire rate.

• Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual OMM-00820J AERCO International, Inc. The AERCO Benchmark (BMK) 750 and 1000 MBH Boilers are modulating and condensing units. They are a true industry advancement that meets the needs of today's energy and environmental concerns.
• Feb 16, 2014  A quick start-up and run of an Aerco Benchmark 2.0 Low NOx boiler. 100,000 BTU minimum fire 2,000,000 BTU maximum fire 87% - 98.6% efficiency depending on EWT and fire rate.

TABLE 8-1. BOILER TROUBLESHOOTING – Continued

FAULT INDICATION

PROBABLE CAUSES

CORRECTIVE ACTION

(continued)

7. Defective Differential Pressure

Regulator

8. Carbon or other debris on Burner

7. Check gas pressure readings using gauge or manometer into

and out of the Air/Fuel Valve to ensure gas is getting to the
burner.

8. Remove the burner and inspect for any carbon or debris. Clean

and reinstall

FLAME LOSS

DURING RUN

1. Worn Flame Detector or cracked

ceramic.

2. Defective Differential Regulator.

3. Poor combustion calibration.
4. Debris on burner.

5. Blocked condensate drain.

1. Remove and inspect the Flame Detector for signs of wear or

cracked ceramic. Replace if necessary.

2. Check gas pressure readings using a gauge or manometer into

and out of the Air/Fuel Valve to ensure that the gas pressure
into and out of the valve is correct.

3. Check combustion calibration. Adjust as necessary.
4. Remove the burner and inspect for any carbon or debris. Clean

and reinstall.

5. Remove blockage in condensate drain.

HEAT DEMAND

FAILURE

1. The Heat Demand Relays on the

Ignition/Stepper board failed to
activate when commanded
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2. Relay is activated when not in

Demand

1. Press CLEAR button and restart the unit. If the fault persists,

replace Ignition/Stepper (IGST) Board.

2. Defective relay. Replace IGST Board.

HIGH EXHAUST
TEMPERATURE

1. Defective exhaust sensor.

2. Carboned heat exchanger due to

incorrect combustion calibration

1. Measure the actual exhaust temperature and continuity of the

exhaust sensor. If the exhaust temperature is less than 475

o

F

and the exhaust sensor shows continuity replace the sensor.

2. If exhaust temperature is greater than 500

o

F, check

combustion calibration. Calibrate or repair as necessary.

HIGH GAS

PRESSURE

1. Incorrect supply gas pressure.

2. Defective SSOV Supply Regulator.

1. Check to ensure gas pressure at inlet of SSOV is 2 psig

maximum.

2. If gas supply pressure downstream of SSOV cannot be lowered,

to 4.8” W.C. (see para. 4.3, step 8), the SSOV Supply Regulator
may be defective. For Benchmark 2.0 Low NOx boilers
configured for De-Rated capacity (see para. 2.4.1), if gas supply
pressure downstream of the SSOV cannot be lowered to

8

-4

TROUBLESHOOTING

TABLE 8-1. BOILER TROUBLESHOOTING – Continued

FAULT INDICATION

PROBABLE CAUSES

CORRECTIVE ACTION

continued

3. Device proving switch hooked to

interlocks is not closed.

3. Check that proving switch for any device hooked to the interlock

circuit is closing and that the device is operational.

LINE VOLTAGE

OUT OF PHASE

1. Line and Neutral switched in AC

Power Box.

2. Incorrect power supply transformer

wiring.

1. Check hot and neutral in AC Power Box to ensure they are not

reversed

2. Check transformer wiring, in AC Power Box, against the power

box transformer wiring diagram to ensure it is wired correctly

Aerco Benchmark 2.0 Parts List

LOW GAS

PRESSURE

1. Incorrect supply gas pressure.

2. Defective Low Pressure Gas Switch

1. Measure gas pressure upstream of the supply gas regulator with

the unit firing. Ensure it is at least 5.3” WC (5.5” WC for IRI). For
Benchmark 2.0 Low NOx boilers configured for De-Rated
capacity (see para. 2.4.1), ensure gas pressure upstream of the
supply gas regulator, with the unit firing, is at least 4.0” W.C.
(4.2” W.C. for IRI).

2. Measure gas pressure at the low gas pressure switch, if it is

greater than 4.4” WC measure continuity across the switch and
replace if necessary. For Benchmark 2.0 Low NOx boilers
configured for De-Rated capacity (see para. 2.4.1), if measured
gas pressure at the low gas pressure switch is greater than 3.6”
W.C., measure continuity across the switch and replace if
necessary.

LOW WATER

LEVEL

1. Insufficient water level in system
2. Defective water level circuitry.

3. Defective water level probe.

1. Check system for sufficient water level.
2. Test water level circuitry using the Control Box front panel LOW

WATER TEST and RESET buttons. Replace water level
circuitry if it does not respond.

Aerco Benchmark Boilers

3. Check continuity of probe end to the shell, change probe if there

is no continuity.

MODBUS COMM

FAULT

1. Boiler not seeing information from

modbus network

1. Check network connections. If fault persists, contact qualified

Service Personnel.

Benchmark 2.0 Boiler Parts

PRG SWTCH CLOSED

DURING IGNITION

1. A/F Valve rotated open to purge and

Aerco Boiler Troubleshooting

did not rotate to ignition position

1. Start the unit. The Air/Fuel Valve should rotate to the purge

Aerco Benchmark 2.0 Manual

(open) position, then back to ignition position (towards closed)
during the ignition cycle. If the valve does not rotate back to the
ignition position, check the Air/Fuel Valve calibration. If
calibration is okay, the problem may be in the Air/Fuel Valve or
the Control Box. Refer fault to qualified service personnel.

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