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Water circuit connections are made in the back of
the unit utilizing the four 1" male pipe thread cou-
plings provided. Model FCX can be connecte d to va-
rious comfort heating water systems as well as to a
domestic hot water heating system if desired, obser-
ving that:
•Water circulating pumps provided in the va-
rious circuits must be large enough for each
circuit including the pressure drop of the boiler/
condenser in the unit. For optimum sound level
and power consumption, set the circulator to
the speed that is appropriate for the installation
flow rate and pressure drop.
•Isolation valves may be used in the various cir-
cuits to facilitate boiler maintenance without
having to completely drain each circuit. NE-
VER place an isolation valve between a pres-
sure relief device and a water tank.
•An expansion tank must be provided in the
system to support an expansion of 6 % of the
total water capacity of all the circuits employed.
•Safety pressure relief valve must be connected
to the drain.
•The water pressure gauge (not supplied) has
to be fitted outside the unit.
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