Service manual

10
FCX INSTALLATION AND SERVICE MANUAL
6 - WATER CIRCUIT CONNECTIONS
Water circuit connections are made in the back of the unit
utilizing the four 1" male pipe thread couplings provided or
using other adapters provided. The FCX can be connected to
various comfort heating water systems as well as to a domestic
hot water heating system if desired, observing that:
•Water circulating pumps provided in the various circuits must
be large enough for each circuit including the pressure drop
of the heating system/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 circuits to facilitate
heating system maintenance without having to completely
drain each circuit. NEVER place an isolation valve between
a pressure relief device and a water tank.
• The water pressure gauge (not supplied) has to be fitted outside
the unit.
INSTALLATION
The FCX comes equipped with the following standard equipment:
1) 8L expansion Tank (Approx. 2.11 US Gallon with acceptance
value of approx. 0.9 gallons) Please refer to expansion tank
manufacturers tables to determine tanks that meet your systems
requirements. Some radiant systems may require special tanks
to meet tubing oxygen requirements.
2) Grundfos UPS1542 Circulator. (see Fig. 35 on page 11 for
pump capacities.) Additional pumps or a primary secondary
system may need to be set up to meet individual system
requirements
3) Safety relief valve. Must be piped away from
heating system
as per code using rigid pipe that is the same diameter of the relief
valve outlet approved for the temperature of the system. Discharge
pipe must not cause a hazard or a potential cause of damage to
equipmernt.
CAUTION:
If the pressure relief valve is not piped down and it opens, damage
can occur to the burner.
Fig. 34
1.expansion tank
2.circulating pump
3.safety pressure relief valve
Note: Installed expansion tank is good for up to 25 gallons of
system water. An additional expansion tank is required for more
than 25 gallons. Size accordingly.
5 - CONDENSATE DRAIN CONNECTION
Connection of the condensate drain piping system is to the
condensate drain tube in the rear of the unit beneath the flue/
combustion air separator tube assembly. The condensate drain
tube provided in the unit is 1-19/32 inches (40 mm) outside
diameter over which standard 1-1/2 inch trade size schedule
40 PVC pipe can be connected to begin the rest of the drain
system. A trap must be provided to prevent leakage of
combustion products into the drain. The drain system must
pitch downward towards the sewer.
Note: The condensate will not likely require any specific water
treatment because of condensate dilution by normal wastewater
use. If, however, local regulations require wastewater to have a
neutral pH condensate treatment tank can be installed between
the trap and the sewer. PH level must be neutralized before
entering a septic tank or cesspool.
Fig. 33
NOTE: Make the trap accessible and removable for cleaning and
do not down size the condensate drain tube until after the trap, if
necessary. If using a condensate pump choose a pump that can
hold up to the corrosive effects of the condensate.