7
MAINTENANCE
SCHEDULE:
• Blow down control as follows when boiler is in
operation:
Steam:
– Daily if operating pressure is above 15 psi.
– Weekly if operating pressure is below 15 psi.
Hot Water:
– Quarterly
• Disassemble and inspect annually. Replace the
low water cut-off if it is worn, corroded, or if
components no longer operate properly.
• Inspect the float chamber and equalizing piping
annually. Remove all sediment and debris.
• Replace head mechanism every 5 years.
More frequent replacement may be required when
severe conditions exist such as rapid switch cycling,
surging water levels, and use of water treatment
chemicals.
•
We recommend head mechanism replacement
when the switch(es) no longer operate properly.
If you choose to replace the switch(es), order the
proper McDonnell & Miller replacement switch or
switch assembly and follow the Repair Procedure
provided.
More frequent blow-down may be necessary due to dirty
water and/or local codes.
NOTE
PROCEDURE:
1. Blow down the low water cut-off when the water
level is at its normal level and the burner is on.
Slowly
open the blow down valve until it is fully
open and observe the water level fall in the gauge
glass. Close the valve after verifying that the pump
contacts have closed and the burner shuts off.
If this does not happen, immediately shut off
the boiler and correct the problem.
To prevent serious personal injury from steam
pipe blow down, connect a drain pipe to the
control opening to avoid exposure to steam
discharge.
Failure to follow this caution could cause
personal injury.
!
CAUTION