Operation; Precautions; Start Up Of The System; System Venting And Purging - Xylem Bell & Gossett CRS Instruction Manual

5 Operation

5 Operation

5.1 Precautions

Before starting work, make sure that the safety instructions in the chapter
Safety

5.2 Start up of the system

1. Flush the CRS to remove the dirt, sediment, magnetite, and other contaminants that are
collected in the first 24 to 48 hours.
2. During normal service life, flush the CRS annually to remove the dirt, sediment,
magnetite, and other contaminants. Open systems that are exposed to the atmosphere,
systems that use cast iron piping or retrofit applications may require more frequent
servicing.
3. During the initial startup, frequently operate the blowdown valve.
4. After each blowdown operation, record the amount of sediment that is collected and the
amount of time since the previous blowdown operation.
Use this information to determine and sufficient blowdown schedule for your system.
If left in position, a noticeable increase in pressure drop may be observed as the
separator becomes clogged and starts restricting flow through the device. This can
negatively impact system efficiency.
For more information about flushing the CRS, consult local sales and service
representative.

5.3 System venting and purging

CAUTION:
Uncontrolled venting of water can occur with automatic air vents if foreign material prevents
vent from closing. Unwanted flow should be directed to a drain. Failure to follow these
instructions could result in property damage and/or moderate personal injury.
• After initial venting and purging of air from the system, more air will be released from the
water as it is heated.
• An optional Bell & Gossett No. 107A air vent may be assembled at the top of the Series
CRS separator.
• If the system has multiple loops or zones, the supply water for all loops and zones must
pass through the Series CRS separator for complete and continuous air removal.
• In case the piping arrangement does not permit the installation of a single separator on
the main, additional separators must be installed on each loop or zone. In this event, only
one expansion tank is required for the system.
• The air vents must be installed on high points in the system.
• A port is provided towards the top of the separator for installation of an optional skim
valve.
• A skim valve is used during system filling, and during system maintenance, to eliminate
the floating debris that may have collected in the separator as the system is being filled.
• The skim port must not be used for filling the system or to add make-up water during
operation.
10
on page 2 have been read and understood.
– Flushing must be done after the initial circulation, commissioning, and cleaning of the
system.
Introduction and
CRS Instruction Manual