Cleaver-Brooks C1X Series, Operation Manual

Standard Economizers

Part No. 750-266

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Apply expansion joints (supplied by others) as required by the installation to ensure that no outside
forces from thermal expansion to either the exhaust gas connections or to the piping will be permitted.

Exhaust connections are generally mated with optional mating flanges and/or stack transitions. The
mating  flanges  can  be  butt  or  slip  fit welded  to  the  stack  breaching  once  aligned. Ensure  that  the
economizer is level before final welding and/or bolting into position.

Liquid connections are connected either with NPT threaded fittings or flange connections.   Liquid
piping should include shut-off and bypass valve piping in the event the exchanger is required to be
isolated. 

NOTE:

The safety relief valve must be located between any isolation valves and the economizer and

within close proximity of the exchanger. Liquid piping to and from the exchanger should allow the
exchanger to be filled at all times especially when flow could stop. 

Deaerated water is recommended with any C-B economizer. Generally, schedule 80 steel pipe is used
in the piping installation. In some applications other piping material may be needed. Consider the type
of liquid, operating pressures and temperatures, and any corrosive elements in the liquid or in the
atmosphere when determining the best piping material for your installation. The use of unions and/or
flanges is recommended where isolation might be required. Stainless steel piping is recommended if
using non-deaerated water.

If a circulating pump is part of the system being installed, a ball or flow control valve installed on the
suction side of the pump and one on the discharge side of the pump will allow for easier pump removal
and replacement.

Drain piping should include valves of dependable manufacture in order to further reduce the possibility
of an undetected leak.

Safety relief valves, as required, should be located at the exchanger and piped separately and safely
to the drain.

The installation of a vent valve at the highest point in the piping system is recommended in order to
purge air out especially during initial start up.

1.3.1- Special Installation Considerations

The C-B economizer may be installed inside or outside with appropriate drain piping installed for
shutdown periods. If there is a remote chance the temperatures outside might fall below freezing it is
recommended that care be taken to avoid freezing the heat transfer core. Coil type exchangers (CCE)
installed in the horizontal position will require 80 psig minimum air pressure to blow the liquid out of
the coil.

A drain connection and catch basin are provided in the bottom for all economizers.

For natural gas applications where the economizer is installed horizontally, a drain connection is
provided by C-B at the bottom point of the side. Please note the submittal drawing or consult C-B for
exact installation position. Condensate drain piping can be piped to the floor drain. Condensate piping
should include a water trap to prevent the escape of flue gas.

Freeze protection concerns: 

During a system shutdown where combustion halts for an extended period

of time (other than normal cycling), cold air will travel back down the stack and exhaust breachings,
through the exchanger and into the combustion source. If the cold air is below freezing, it could freeze
the finned tubing and cause a rupture, ultimately destroying the exchanger. For potential freezing
applications where the water flow might stop, a manual system shut down routine should be
incorporated. It is not recommended to use solenoid type drain valves for auto draining in sub zero
environments unless absolutely necessary.