Cleaver-Brooks ClearFire CFLC Series, Operation And Maintenance Manual, Page: 28 / 290

Section 2 — Installation
2-14 Part No. 750-363
2.8 BOILER WATER PIPING
2.8.1 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.
2.8.2 Safety valve
The pressure relief valve (safety valve) should be piped from the coupling on top of the boiler (see Figure
2-7 ). 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 of foreign 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.
2.8.3 Dual return design
The Model CFLC 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 CFLC will achieve condensing performance, with associated gains in
efficiency.
Figure 2-7 Safety 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.