Watts AERCO Benchmark 2.0 LN Operating & Maintenance Instructions page 51

MAINTENANCE
7.7 CONDENSATE DRAIN TRAP
The boiler contains a condensate drain trap
connected to the drain line of the exhaust
manifold (see Figures 2.4 & 2.5). The trap
should be inspected and, if necessary, cleaned
to ensure proper operation. Proceed as follows:
1. Disconnect the external condensate trap by
loosening the hose clamps between the trap
and the condensate drain connection on the
exhaust manifold of the boiler (Figure 2.5).
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. Check the condensate drain tapped hole in
the exhaust manifold (Figure 2.4) to ensure
it is clear of blockage.
8. 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.
9. Reassemble all piping and hose connections
to the condensate trap inlet and outlet.
Reconnect trap
connection on the exhaust manifold.
COVER
GASKET
FLOAT
ORIFICE
GASKET
3/4 NPT
PORT
OUTLET
Figure 7.4
External Condensate Trap
7-4
to condensate drain
THUMB
SCREWS
(4)
INLET
3/4 NPT
PORT
7.8 SHUTTING THE BOILER DOWN FOR
AN EXTENDED PERIOD OF TIME
If the boiler is to be taken out of service for an
extended period of time, one year or more, the
following instructions must be followed.
1. Set the ON/OFF switch on the front panel to
the OFF position to shut down the boiler's
operating control.
2. Disconnect AC power from the unit.
3. Close supply and return valves to isolate
boiler.
4. Close external gas supply valve.
5. Open relief valve to vent water pressure.
7.9 PLACING THE BOILER BACK IN
SERVICE AFTER A PROLONGED
SHUTDOWN
After a prolonged shutdown (a year or more),
the following procedures must be followed:
1. Review installation requirements as shown
in Chapter 2
2. Inspect all piping and connection to the unit
3. Inspect exhaust vent, air duct(if applicable)
and
4. Perform initial startup per Chapter 4
5. Perform safety device and maintenance
procedures per Chapters 6 and 7 of this
manual.