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 Piping
Each boiler is supplied with a pressure-relief valve
sized in accordance with ASME requirements. Lower
pressure relief valves are available, contact your
Patterson-Kelley representative. 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.
CAUTION!
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 is 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 C1500/C2000 boiler heat exchanger is
made of an aluminum alloy. The heat exchanger
requires special water conditions to retain efficiency
and function properly.
NOTE!
Chemicals added to the system must be
approved by the chemical manufacturer for use in
aluminum boilers.
NOTE!
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
