Part number 550-143-010/1021
75
GV90+
series
2
gas-fired water boiler – boiler manual
Figure 83
Recuperator flue way drain holes
6. Dump any remaining water from the recuperator.
7. Look through the flue adapter and locate the flue way drain
holes as shown in Figure 83.
8. Use a brush or other means to remove blockage from these
holes.
9. Rinse the recuperator thoroughly.
If the recuperator shows signs of significant cor-
rosion or deterioration, contact Weil-McLain for
recommendations on investigating the cause and
replacing the recuperator if necessary.
Re-install the recuperator
1. Inspect the recuperator gaskets to make sure all are in good
condition. Replace if there is any sign of damage.
2. Attach the recuperator at the boiler connection.
3. Secure with the four nuts.
4. Re-connect the water connections to the upper and lower
recuperator flanges.
5. Re-insert the in-line drain fitting into the recuperator vent
adapter. Tighten the clamp to secure in place.
6. Re-connect the plug-in connector on the thermal switch
(
, item 27).
Re-install the condensate trap
Make sure the condensate trap is re-installed
securely.
Failure to comply with the above could result in
severe personal injury, death or substantial property
damage.
Re-connect the vent pipe
1. If the vent pipe was lifted out, re-insert the vent pipe into.
2. If the vent pipe was cut, install a coupling in the vent line to
allow re-connection.
3. If a section was removed (stainless vent pipe), replace the
section.
4. Re-connect the vent pipe to the in-line drain fitting and
tighten the clamp.
When replacing the vent pipe, follow all instruc-
tions in this manual to ensure the vent is properly
completed. Failure to properly the vent pipe could
result in severe personal injury, death or substantial
property damage.
Service & maintenance
(continued)
