MACH® Gas-Fired Boiler
Page 26
MACH Variable Pumping
0
10
20
30
40
50
60
70
80
90
100
20
40
60
80
100
Firing Rate (%)
F
lo
w
R
a
te
(G
PM)
C2000
C1500
Pressure Drop Chart
0.00
5.00
10.00
15.00
20.00
25.00
30.00
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
Flow (GPM)
D
e
lt
a
P
(
ft
H
2
O
)
3.7.1.1
Piping With Refrigeration Machines
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.
3.7.1.2
Piping With Air Handling Units
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.
C1500
C2000