Lennox GWB9 User Manual

49
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1. Remove jacket front and top panels and check for pip- 1.
ing leaks around relief valve and other ttings. If found,
contact a qualied service agency to repair. DO NOT use
stop leak compounds.
2. Test relief valve. Refer to valve manufacturers instruc- 2.
tions packaged with relief valve.
3. Visually inspect venting and air intake system for 3.
proper function, deterioration, or leakage. If the vent
or air intake show any signs of deterioration or leakage,
contact a qualied service agency to repair or replace them
immediately and to insure proper reassembly and reseal-
ing of the vent and air intake system.
4. Visually inspect the clear vinyl condensate lines and the
4.
PVC condensate drain pipe for proper operation, leakage,
and deterioration. If the condensate lines or drain pipe
show any signs of blockage, leakage, or deterioration con-
tact a qualied service agency to clean, repair, or replace
them immediately.
5. Check the air bae located inside 1 ½” x 2” exible 5.
coupling, clean it if necessary and make sure to put it back.
Refer to repair parts diagram, mixer and pressure switch
assembly.
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Where low water cut os are used, a periodic inspection of
the low water cut o is necessary, including ushing of oat
type devices. Refer to low water cut o manufacturer’s specic
instructions.
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
Follow instructions “TO TURN OFF GAS TO APPLIANCE”.
If heating system is to remain out of service during freezing
weather, and does not contain antifreeze, drain system com-
pletely. If boiler will be exposed to freezing temperatures, drain
condensate lines. Otherwise, do not drain system or boiler.
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
e following service procedures must be performed only
by a qualied service agency. Boiler owner should not at-
tempt these procedures.
Before Servicing, turn o electrical power to boiler at ser- 1.
vice switch. Close manual gas valve to turn o gas supply
to boiler.
Cleaning Flue passages between boiler sections.
2.
Any buildup of sediment or aluminum oxide (white A.
powdery or aky substance) in the ue passages must be
cleaned as follows:
Remove jacket front and top panels. Disconnect con-B.
densate drain line from the barbed tting on the bottom
of the boiler. Keep the open end of the drain line above
the water level in the condensate trap to prevent the trap
from draining. Disconnect pressure switch hose from
barbed tting on gas valve. Disconnect 1½ x 2” exible
coupling from air inlet. Disconnect air by-pass (½” trans-
parent vinyl tube) from the bottom of the mixer.
Remove air bae from ½” x 2” exible coupling and C.
clean air bae if necessary. Refer to repair parts diagram,
mixer and pressure switch assembly.
Conrm that manual gas valve is closed and disconnect D.
gas line to gas valve at union. Disconnect wires to gas
valve. and igniter.
Loosen but do not remove ve (5) nuts attaching mixer E.
assembly to boiler. Remove two (2) igniter screws and
very carefully remove the igniter. Use care when remov-
ing the igniter, it is very brittle!
Remove ve (5) nuts and remove mixer assembly. Re-F.
move burner and mixer gasket.
Aluminum oxide deposits are water soluble and may G.
be rinsed away with spraying or running water. Before
rinsing, connect a ½” I.D. hose to the barbed tting on
the bottom of the boiler and run the hose to a bucket or
drain.


Lennox GWB9 Specifications

General

Brand	Lennox
Model	GWB9
Category	Boiler
Language	English