20
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
21
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
INST
alla
TION
Gas Fired Boiler
Water Quality
The boiler heat exchanger is made of stainless steel. The heat exchanger
requires proper water conditions to remain efficient and function properly.
For information, please refer to Hartsco Industrial Patterson Kelley Multi-
Metal Systems Water Quality Standards as it appears in Appendix 3 as
this applies to the warranty of your heat exchanger.
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 for maximum efficiency and long life of the boiler.
Relief Valve Piping
Each boiler is supplied with a pressure-relief valves sized in accordance
with ASME requirements. The relief valves must be piped to an
acceptable drain. Reducing couplings or other restrictions are not
permitted in the discharge line. The Section IV valve must be installed
as per Fig 3.7.2 and the Section VIII valve must be installed according to
ASME/local codes. Both valves are provided with the boiler for convience.
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
LOCKOUT LOW WATER LEVEL
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.
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 factory installed in the boiler inlet (system return) piping.
Prior to draining the boiler, electrical power and gas supply must be turned
off to the boiler, and the boiler must be isolated from the system at the
supply and return connections.
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. If
the condensate drainage system is exposed to freezing temperatures, it
must be field heat traced. The boiler could generate up to one gallon of
condensate per 100,000 BTU input. As an example, a
SC-3000
boiler at full
fire could produce 30 gallons per hour of condensate.
All water connections should be in compliance with national, state and local code requirements. Adapters from
Victaulic to NPT are available from Harsco Industrial, Patterson-Kelley.
The bottom rear connection to the boiler is the INLET and must be used for the return from the system.
The top rear connection to the boiler is the OUTLET and must be connected as the supply to the system.
Piping must be installed such that no piping stresses are transmitted to the boiler. The boiler
shall not
be used as a
pipe anchor.
When installed in a two-pipe system that provides both chilled and hot
water, the control system should be configured so as to limit the time rate of change of temperature at the boiler.
Consult your authorized Harsco Industrial, Patterson-Kelley boiler representative for application guidance.
The boiler and all gas piping connections should be pressure-tested and
must be checked for leaks before being placed into service. Test with
compressed air or inert gas if possible.
The boiler must be
disconnected
at the boiler manual shut-off valve
(located at the end of the supplied gas train) from the gas supply piping
system during any pressure testing of the system at pressures in excess
of 1/2 psig (14" wc).
During any pressure testing of the gas supply piping system at pressures
equal to or less than 1/2 psig (14" wc), the boiler must be isolated from
the gas supply piping system by closing the manual shut-off.
Some leak test solutions, including soap and water, may cause corrosion.
These solutions should be rinsed-off with water after testing.
3.6.1 Gas supply Piping by Installer
3.7 b
oIler
W
aTer
p
IpIng
3.7.1.1 Piping with Refrigeration lines
The boiler piping system of a hot water heating boiler connected to heating coils located in air handling units,
where they may be exposed to refrigerated air circulation, must be equipped with flow control valves or other
automatic means to prevent gravity circulation of the boiler water during the cooling cycle.
3.7.1.2 Piping with Air handling units
3.7.2 Boiler Inlet and Outlet Connections
The
SC-3000 -
SC-4000
boiler
is furnished with 4” grooved
connections and Victaulic Style
75 Couplings. These couplings
must be used with the EPDM
Victaulic seals. Isolating valves
must be installed in both water
connections.
Condensate Trap must be piped
to drain in accordance with all
national, state and local codes. If
installed outdoors and the local
climate requires freeze protection,
it must be field heat traced.
n
oTICe
!
n
oTICe
!
3.7.3 Boiler Water Piping by Installer
The low water cutoff 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
additional low water safety
devices to protect the system
should be considered.
n
oTICe
!
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.
n
oTICe
!
Condensate Trap must be piped
to drain in accordance with all
national, state and local codes.
n
oTICe
!
Glycol or other treatment
chemicals added to the system
must be certified by the chemical
manufacturer for use in multi-
metal systems that include
stainless steel boilers.
n
oTICe
!
Under no circumstances should
petroleum based cleaning or
sealing compounds be used in the
boiler system.
n
oTICe
!
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.
n
oTICe
!
3.7.4 Flushing and Filling
Figure 3.7.2
Install Section IV Relief
Valve here
Possible installation loca
-
tion of Section VIII Relief
Valve