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IX System Piping
A. General System Piping Precautions
WARNING
INSTALL BOILER SO THAT THE GAS IGNITION SYSTEM COMPONENTS ARE PROTECTED
FROM WATER (DRIPPING, SPRAYING, RAIN, ETC) DURING APPLIANCE OPERATION AND
SERVICE (CIRCULATOR REPLACEMENT, ETC).
CAUTION
THE HEAT EXCHANGER USED IN THE FCM IS MADE FROM A SPECIAL ALUMINUM ALLOY.
FAILURE TO TAKE THE FOLLOWING PRECAUTIONS COULD RESULT IN SEVERE BOILER
DAMAGE.
• BEFORE CONNECTING BOILER, MAKE SURE THAT THE SYSTEM IS FREE OF SEDI-
MENT, FLUX AND ANY RESIDUAL BOILER WATER ADDITIVES. FLUSH THE SYSTEM IF
NECESSARY TO ENSURE THAT THESE CONTAMINATES ARE REMOVED.
• DO NOT CONNECT THIS BOILER TO A SYSTEM THAT IS SUBJECT TO REGULAR ADDI-
TIONS OF MAKEUP WATER OR ONE WHICH EMPLOYS RADIANT TUBING WITHOUT AN
OXYGEN BARRIER.
• DO NOT ADD ANTIFREEZE OR OTHER BOILER WATER TREATMENT CHEMICALS
EXCEPT THOSE LISTED IN PART XI OF THIS MANUAL.
• MAINTAIN THE PRESSURE IN THE BOILER AT A MINIMUM OF 12 PSI.
• DESIGN SYSTEM TO ENSURE THAT THE FLOW FALLS WITHIN THE LIMITS CALLED
FOR IN TABLE 9.1.
B. System Design
Proper operation of the FCM boiler requires that the water fl ow through the boiler remain within the limits shown in Table
9.1 any time the burner is fi ring. Failure to maintain the fl ow within these limits could result in erratic operation or premature
boiler failure.
There are two basic methods that can be used to pipe the FCM boiler. Method #1 is almost always preferred. The
instructions on the following pages describe these methods for piping FCM boilers and explain how to size the circulator and
piping. Additional information on hydronic system design may be found in Installation of Residential Hydronic Systems (Pub.
#200) published by the Hydronics Institute in Berkeley Heights, NJ.
TABLE 9.1: FLOW REQUIREMENTS THROUGH BOILER
BOILER MODEL
MIN. REQUIRED FLOW
(GPM)
MAX. ALLOW ABLE
FLOW (GPM)
FCM090 4.0 9.0
FCM120 4.5 12.0