MACH® Gas-Fired Boiler
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A drain valve is installed in the inlet (system return) header connection to the boiler. Prior to draining the boiler for
maintenance or testing, electrical power and gas supply must be turned off to the boiler. The boiler must then be
isolated from the system at the supply and return connections prior to draining water from the boiler.
NOTICE! This drain valve is factory installed for draining of the boiler water only, not the entire system.
Draining of the system through the boiler will result in depositing sediment from the system in the boiler
which will result in poor heat transfer characteristics of the boiler and early boiler failure.
Condensate Drain
The condensate is acidic (pH between 3.0 and 5.0) and may be corrosive to some building drain systems. A
condensate neutralization system may be required and is available from Harsco Industrial, Patterson-Kelley.
Disposal of condensate must comply with all state and local codes.
The boiler could generate up to one gallon of condensate per 100,000 BTU input.
MACH® Boiler
Gal of Condensate
(per hour maximum)
C1500GG
15
C2000GG
20
3.7.4 Flushing and Filling
Water Quality
The MACH
®
boiler heat exchanger is made of an aluminum alloy. The heat exchanger requires proper water conditions to remain
efficient and function properly.
NOTICE! Under no circumstances should petroleum based cleaning or sealing compounds be used in
the boiler system.
NOTICE! Under no circumstances should the hydronic system be flushed while the boiler is attached to
the system since the debris or corrosion products could accumulate in the boiler and plug the boiler heat
exchanger.
NOTICE! If the piping system attached to this unit will be chemically cleaned, the boiler must be
disconnected from the system and a bypass installed so that the chemical cleaning solution does not
circulate through the boiler. Following chemical cleaning, the system should be thoroughly rinsed to
remove cleaning agents prior to reconnecting the boiler to the system.
NOTICE! Glycol or other treatment chemicals added to the system must be certified by the chemical
manufacturer for use in multi-metal systems that include cast aluminum boilers. A list of manufacturers
known to certify multi-metal treatments is included in Appendix 3.