Watts AERCO Benchmark 2.0, User Manual

Page: 54 / 97

MAINTENANCE
7-4
train realignment is required, loosen the
support brackets/U-bolts at the upper and
lower portions of the gas train as shown in
Figure 7.4.
SSOV
C
BURNER
UPPER
SUPPORT
BRACKET
LOWER
SUPPORT
BRACKET
AIR/FUEL
VALVE
Figure 7.4
Gas Train Support Bracket Locations
13. After the gas train is properly aligned,
tighten and secure the upper and lower
support brackets/U-bolts.
14. Secure the Gas Inlet Pipe to the gas outlet
flange of the Air/Fuel Valve using the four
5/8-11 bolts and hex nuts. Fully tighten the
bolts and nuts.
15. Next, fully tighten the six 5/16-16 bolts
previously installed in step 11.
16. Reconnect and secure the combustion air
hose to the Burner Assembly by tightening
the hose clamp (Fig. 7.3).
17. Reconnect the wire leads to the igniter
contactor and flame detector.
18. Replace the top and side panels on the unit.
19. Reapply AC power and return the unit to
service use.
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 7.5.
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 to condensate drain
connection on the exhaust manifold.
FLOAT
THUMB
SCREWS
(4)
3/4 NPT
PORT
INLET
OUTLET
3/4 NPT
PORT
COVER
GASKET
ORIFICE
GASKET
Figure 7.5
External Condensate Trap