Install Instructions

MAINTENANCE
SCHEDULE:
• Blow down control as follows when boiler is in operation.
– Daily if operating pressure is above 15 psi.
– Weekly if operating pressure is below 15 psi.
• Disassemble and inspect low water cut-off/pump controller
annually. Replace 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.
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
and hot water during blow down, connect piping
to the discharge side of the blow down valve to
avoid exposure to steam discharge.
Failure to follow this caution could cause
personal injury.
!
CAUTION
Replacement Switch Assembly
NOTE
More frequent blow-down may be necessary due to unusual
water or system conditions, including dirt and minerals
and/or local codes.
L
N
CUT-OFF
LEVEL
d.
To prevent serious personal injury from steam and hot water
during blow down, connect piping to the discharge side of the
blow down valve to avoid exposure to steam discharge.
Failure to follow this caution could cause personal injury.
!
CAUTION
When the water level is at its normal level and the burner is
on, slowly open the blow down valve (N) until it is fully open.
Watch the gauge glass (L) to see that the water level drops.
Close the valve after verifying that the pump comes on and
the burner shuts off. If this does not occur, immediately shut
off the boiler and correct the problem and retest.
INSTALLATION COMPLETE
ITT
8200 N. Austin Ave.
Morton Grove, IL 60053
tel: [phone]
fax: [phone]
www.mcdonnellmiller.com
McDonnell & Miller
©2007 ITT Corporation
Printed in U.S.A. 2-07 210428