Noritz CB199-DV - Heating System Installation

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Heating Installation
Chapter4.–Installation
System Pressure
The Combi Boiler is intended solely for use in pressurized closed loop heating systems operating with 12-30 psi water
pressure at the Combi Boiler outlet.
To obtain the minimum system design pressure, follow the piping diagrams illustrated in this section.
The Combi Boiler’s Heating system is not approved for operation in an ‘open system’, thus it cannot be used for direct potable
water heating or to process heating of any kind.
Backow Preventer
Install a backow preventer valve in the make-up water supply to the unit as required by local codes.
Expansion Tank
An expansion tank must be installed in the heating piping to prevent excessive pressure from building in the system.
See the examples of system application at the end of this section for the installation location.
Refer to the expansion tank manufacturer’s instructions for additional details.
Follow the guidelines below when installing an expansion tank.
• Connect an air separator to the expansion tank only if the air separator is located on the suction side of the system circulator.
• The Combi Boiler is equipped with an auto-feeding water connection and motorized feeding valve.
Therefore, installation of additional system water ll connection is not necessary in most cases.
• If an additional water ll connection is required for a specic use, install the water ll connection at the same location as
the expansion tank’s connection to the system.
• When replacing an expansion tank, consult the expansion tank manufacturer’s literature for proper sizing.
• For diaphragm expansion tanks, always install an automatic air vent on the top side of the air separator to remove
residual air from the system.
Oxygen Elimination
This Combi Boiler may only be installed in a pressurized closed-loop heating system, free of air (oxygen) and other impurities.
To avoid the presence of oxygen, ensure all of the air is removed from the system during commissioning via strategically placed
and adequately sized air removal devices, located throughout the heating system.
4-5. Heating Installation
WARNING
Immediately repair any leaks in the system plumbing to avoid the addition of make-up water; make-up water provides a
source of oxygen and minerals that may lead to heat exchanger failure.Failure to follow these instructions will result in
poor performance, unnecessary wear of system components and premature failure
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Head [ft]
GPM
CB199/CB180 Pump Performance
(with internal pressure drop)
CB 199/CB180 Pump Performance
( with internal pressure drop)
Head [ft]
GPM