AERCO BMK 3.0 LN Nat. Gas APRIL 2009 - Manual (Page 54)

MAINTENANCE
7-4
7.7 CONDENSATE DRAIN TRAPS
The Benchmark 3.0 Boiler contains two
condensate traps as shown in Figure 2-5. One
trap is located external to the unit and attached
to the drain pipe from the connecting manifold.
The other trap is an integral part of the exhaust
manifold. These traps should be inspected and,
if necessary, cleaned to ensure proper
operation. Follow the procedures in paragraphs
7.7.1 and 7.7.2.
7.7.1 Connecting Manifold Condensate
Trap
To inspect and clean the trap, proceed as
follows:
1. Disconnect the external condensate trap by
loosening the hose clamps between the trap
and the connecting manifold drain pipe.
2. Remove the connections on the inlet and
outlet sides of the condensate trap shown in
Figure 7-4.
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 connecting manifold drain
pipe.
Figure 7-4
External Condensate Trap
7.7.2 Exhaust Manifold Condensate Trap
The exhaust manifold condensate trap also
contains a float and orifice gasket identical to
those shown in Figure 7-4. To inspect and clean
the trap, refer to Figure 7-5 and proceed as
follows:
1. Loosen the clamp securing the hose to the
condensate drain (Figure 7-5). Disconnect
the hose.
2. Remove the four bolts securing the flue to
the top of the exhaust manifold. Separate
the flue from the exhaust manifold.
3. From the top of the exhaust manifold,
remove the float and orifice gasket from the
condensate trap.
4. Thoroughly clean the trap, float and gasket.
Also, inspect the drain hose for blockage.
5. After the above items have been inspected
and cleaned, replace the gasket and float in
the condensate trap.
6. Replace the four bolts securing the flue to
the exhaust manifold and connect the hose
to the manifold condensate drain.