UTICA BOILERS UB90-50 Installation Manual page 50

H. After rinsing, remove any remaining loosened sediment
using a shop vacuum with a snorkel attachment.
I. Inspect burner for any foreign matter in the flame ports
or inside the burner. Any foreign matter should be re-
moved by blowing with compressed air or vacuuming.
J. Inspect interior of mixer for any signs of sediment or
aluminum oxide and clean if necessary.
K. Reinstall burner and mixer gasket and position mixer as-
sembly over studs. Install five (5) nuts but do not tighten.
Reinstall igniter and igniter gasket and fasten with two
(2) screws. Use care when installing the igniter. It is very
brittle! Tighten five (5) nuts holding mixer assembly.
L. Connect:
• Gas line to gas valve
• Condensate drain line to boiler
• Pressure switch hose to gas valve
• Air by-pass to mixer
• 1 ½" x 2" flexible coupling to air inlet and make sure to
put air baffle back to correct position
• Igniter wires
• Gas valve wires
3. Visually inspect condensate lines leading from the boiler
sections and the vent tee to the condensate trap. Refer to
repair parts diagrams. Any foreign material or debris that
is visible in the condensate lines needs to be cleaned out as
follows:
A. Raise condensate trap and drain condensate lines com-
pletely.
B. Once the condensate trap is emptied of water, disconnect
condensate lines from the fittings on the boiler, the vent
tee, and the condensate outlet.
MAINTANANCE AND CLEANING
C.
D.
E.
4.
A.
B.
C.
D.
E.
50
Remove the condensate trap and run cold water through
the condensate lines to thoroughly flush out any sedi-
ment or debris in the lines.
Reinstall and connect the condensate trap, using the hose
clamps to secure the various condensate lines to their
fittings.
Follow the instructions under "NEAR BOILER PIPING"
for" filling condensate trap with water"
Inspection of the flue connector requires the following steps
(Refer to the repair parts diagram.)
Loosen the clamp on the draft inducer end of the 2"
flexible coupling that connects the vent tee to the draft
inducer. Disconnect (unplug) wiring harness from draft
inducer motor and draft inducer temperature safety
switch. Remove four (4) bolts that attach draft inducer to
flue connector.
Remove draft inducer and gasket from top of flue con-
nector.
Inspect interior of flue connector. Any buildup of sedi-
ment or aluminum oxide on the inside surface must be
cleaned. Position the draft inducer gasket and the draft
inducer and fasten with four (4) screws. Be sure to con-
nect ground wire from draft inducer motor to one of the
four mounting screws.
Connect wiring harness leads to the draft inducer motor
and the draft inducer temperature safety switch.
Connect the 2" flexible coupling to the draft inducer
outlet.