Section 2 — Installation
2-22 Part No. 750-263
G. BOILER WATER PIPING
1. General
All boiler hot water outlet and return piping is connected at the rear
of the boiler. Piping is to be installed per local codes and
regulations.The pipelines for the hot water outlet and return may be
connected in the usual manner without removing the cladding
elements. Unused connectors must be safely blanked off.
2. Safety valve
Pressure relief valve (Safety Valve) should be piped from the air vent
piping or hot water outlet pipe (see Figure 2-24). Use pipe sealing
compound and a flat sided wrench when securing the Safety relief
valve. Do not use a pipe wrench and do not over tighten the relief
valve. The safety valve must be mounted in a vertical position so
that discharge piping and code-required drains can be properly
piped to prevent buildup of back pressure and accumulation off
oreign material around the valve seat area. Apply only a moderate
amount of pipe compound to male threads and avoid
overtightening, which can distort the seats. Use only flat-jawed
wrenches on the flats provided.
3. Dual return design
The Model CFC features separate high and low temperature return
water connections, allowing for condensing performance within
high temperature hydronic systems. With as little as 10% return
water at or below 120 deg F, the Model CFC will achieve condensing
performance, with associated gains in efficiency.
If using only a single (common) return, the lower return connection
should be used.
4. Pressure drop curves
The information in Figure 2-25 through Figure 2-35 and in Tables
2-12 and 2-13 can help in determining pump requirements for
Model CFC installations.
Figure 2-24 Pressure Relief
Valve Piped to Safe Point of
Discharge
!
Warning
Only properly certified personnel such as the safety valve
manufacturer’s certified representative should adjust or repair the
boiler safety valve. Failure to follow this warning could result in
serious personal injury or death.
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