Weil-McLain 2 Series Manual page 74

series
GV90+
Service & maintenance
To clean the burner
The burner may contain ceramic fiber particles.
Use care when handling these materials per in-
structions on page 106
comply could result in severe personal injury.
1. Clean the burner ports with a soft brush.
2. Use compressed air to blow out any particulate if neces-
sary. Use caution to avoid particulate being blown into the
building.
To replace blower assembly
1. Place a new blower flange gasket over the studs at combus-
tion chamber opening.
2. Reinstall burner cone into chamber opening.
3. Position blower assembly over studs. Install nuts and tighten.
4. Install igniter and new igniter gasket. Fasten with screws
and washers. Tighten only with hand-held screwdriver. DO
NOT use electric or pneumatic driver. Excessive torque will
damage igniter. Do not exceed 20 inch-pounds torque.
5. Connect:
a. Gas valve and piping (4 screws)
b. Gas tubing to gas valve outlet
c. Pressure switch hoses
d. Hose from gas valve to gas/air manifold
e. Air inlet hose
f. Blower motor wiring harness to IBC
g. Igniter harness to igniter plug
h. Blower support bracket (with screw)
i. Ground wire.
6. Be sure all wiring and hose connections are correct per
Figure 81, page 73 and are secure on the hose barb fittings.
Inspecting and cleaning the
recuperator
Turn off power and gas to the boiler. Failure to
do so can cause severe personal injury, death or
substantial property damage.
Wait several minutes after boiler has stopped to al-
low the boiler components to cool to avoid severe
personal injury or death.
Removing/cleaning/re-installing the
recuperator
Disconnect the vent pipe from the recuperator
1. The vent pipe must be disconnected (at the in-line flue drain,
see Figure 7, page 9).
2. If the vent piping can be moved enough, loosen the flue
pipe clamp on the in-line flue drain. Then lift the flue pipe
up and move aside slightly.
3. If the vent piping cannot be moved, then cut the flue pipe
carefully so a coupling can be inserted later, or remove a
section of vent pipe if using stainless vent pipe.
74
gas-fired water boiler – boiler manual
2
of this manual. Failure to
(continued)
Recuperator access and cleaning
Figure 82
Isolate boiler and drain partially
1. Remove the jacket top panel and front panel.
2. Allow time for the boiler to cool down if it has been oper-
ating.
3. Close the isolation valves on the boiler supply and return
connections.
4. The boiler will have to be partially drained.
a. Place a large pan under the boiler drain valve.
b. Slowly open the drain valve and allow about a gallon of
water to drain out.
c. Place the pan under the water connection flanges on
the recuperator.
d. Loosen the upper recuperator flange and allow any water
in the line to run out.
e. Loosen the lower recuperator flange (return connec-
tion) and allow the water in the line and recuperator
to drain out.
5. After the recuperator and water lines have been drained,
disconnect both recuperator flanges.
Remove the recuperator
1. See Figure 102, page 97. Loosen the four (4) nuts that secure
the recuperator to the boiler.
2. Disconnect the plug-in connector on the thermal switch
(Figure 102, page 97, item 27).
3. Carefully slide the recuperator off of the four (4) studs.
4. Loosen the flue adapter clamp and remove the in-line drain
fitting from the flue adapter.
5. Manipulate the recuperator so that the flue way (Figure 82)
and tubes of recuperator (internal tubes not shown) maybe
thoroughly flushed with fresh water, allow the water to drain
out through the recuperator condensate opening.
Part number 550-143-010/1021