AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 92)

Chapter 7
Benchmark 2.0LN Low NOx Boiler
GF-123
Maintenance Installation, Operation and Maintenance Manual OMM-0046_0E
Page 92 of 170 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 PR1 08/20/12
NOTE
During reassembly, apply high-temperature, anti-seize lubricant to the
threads of the igniter-injector and grounding screw. Also, ensure that the
igniter-injector is properly positioned as indicated in Figure 7-3. Torque the
igniter-injector to 15 ft-lbs.
19. Beginning with the burner assembly removed in step 17, reinstall all the components in the
reverse order that they were removed. During re-assembly, replace the gaskets for the
blower and flame detector with new ones.
20. Be sure to align the igniter-injector and flame detector tapped holes in the burner plate with
the heat exchanger top head.
21. Check to ensure that the grounding screw is installed.
7.7 CONDENSATE DRAIN TRAP
The Benchmark 2.0LN Boiler contains a condensate trap as shown in Chapter 2, Figure 2-5.
The trap is located external to the unit and attached to the drain pipe from the exhaust manifold.
This trap should be inspected and, if necessary, cleaned to ensure proper operation.
NOTE
There are two slightly different types of condensate traps that may be used
in your configuration; an older style without an inlet adapter, and a newer
style with a built-in inlet adapter (see Figure 7.5). Maintenance is the same,
except that the newer style does not need an orifice gasket (Step 6).
To inspect and clean the trap, proceed as follows:
1. Disconnect the external condensate trap by loosening the union pipe connection between
the trap and the exhaust manifold drain pipe.
2. Remove the connections on the inlet and outlet sides of the condensate trap shown in
Figure 7-7.
3. Loosen the four (4) thumbscrews securing the cover on the condensate trap. Remove the
cover.
4. Remove the float from the condensate trap.
5. Remove the orifice gasket from the trap.
6. Thoroughly clean the trap, float and gasket. Also inspect the drain piping for blockage. If the
trap cannot be thoroughly cleaned, replace the trap.
7. After the above items have been inspected and thoroughly cleaned, replace the orifice
gasket and float in the condensate trap and replace the trap cover.
8. Reassemble all piping and hose connections to the condensate trap inlet and outlet.
Reconnect trap to exhaust manifold drain.