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MACH® Series
Gas-Fired Boiler Installation
Page 16
3.8.3 Boiler Water Piping by Installer
Strainer
To avoid possible contamination of the boiler with
dirt, rust or sediment from the system, a strainer near
the boiler inlet is strongly recommended. Even new
systems may contain sufficient foreign material to
eventually reduce the performance of the heat
exchanger. Adequate circulation of good clean water
is essential to maximum efficiency and long life of the
boiler.
Relief Valve and Piping
Each boiler is supplied with a pressure-relief valve
sized in accordance with ASME requirements. The
relief valve should be piped to a suitable floor drain.
Reducing couplings or other restrictions are not
permitted in the discharge line.
Low Water Cut-off
The boiler is furnished with a probe-type low water
cut-off; no field piping is required. If the water level
in the boiler drops below the probe, the boiler will shut
down and a flashing E 12 service code will be
displayed on the control panel. The low water cutoff
circuit will automatically reset when the low water
condition clears; however the boiler controls will
retain the lockout condition until the reset button on
the display is depressed.
IMPORTANT!
The low water cutout probe only prevents boiler
operation when the water level in the boiler is
insufficient. It does not detect low water
conditions in other parts of the system.
Installation of high point vents or additional low
water safety devices to protect the system should
be considered.
Installation of external limit controls may be required
by certain codes or in certain installations. Review
applicable local codes for details.
Drain Valve and Piping
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.
Note: This drain valve is 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 can be slightly acidic (pH between
3.0 and 5.0). This may be corrosive to some building
drain systems. A condensate neutralization system
may be required.
Disposal of condensate must comply with all state
and local codes.
3.8.4 Flushing and Filling
Water Quality
The MACH Series boiler heat exchanger is made of
an aluminum alloy. The heat exchanger requires
special water conditions to retain efficiency and
function properly.
IMPORTANT!
Chemicals added to the system must be
approved by the chemical manufacturer for use
in aluminum boilers.
IMPORTANT!
Under no circumstances should petroleum
based cleaning or sealing compounds be used in
the boiler system.
The boiler is designed to operate in a closed-loop
system. As such, the system should be tight and not
require make-up water. A high percentage of