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MACH® Series
Gas-Fired Boiler Operation
Page 29
4.2.3 Emergency Shut-Off
The main gas cock should be closed immediately if an
emergency situation occurs.
4.3
TYPICAL BOILER OPERATING CONDITIONS
Natural Gas
*(1030 Btu/cu. ft.)
LP Gas
**(2500 Btu/cu. ft.)
Model
Number
Input
Rating
(Btu/hr)
Gas
Rate
(CFH)
Output
Capacity
(Btu/hr)
Gas
Rate
(CFH)
Output
Capacity
(Btu/hr)
Total
Amperage
300 300,000 291* 275,000 120** 275,000 8 amps or less
450 450,000 437* 414,000 180** 414,000 8 amps or less
750
750,000 728* 712,500 300* 712,500
8 amps or less
900 900,000 873* 846,000 360** 846,000 8 amps or less
1050 1,050,000 1019* 987,000 420** 987,000 8 amps or less
Note: The heat exchanger is constructed and stamped for 50 psig maximum operating pressure and/or 200º F
maximum temperature.
Main Gas Cock
WARNING!
If overheating occurs or the gas supply
fails to shut off, do not turn off or
disconnect the electrical supply to the
pump. Instead, shut off the gas supply at a
location external to the boiler.
Emergency Shut-Of
f