Boiler Set Up; Boiler Operation - Smith GT-150 Installation, Operating And Maintenance Manual

BOILER SET UP

NOTE: Before starting the boiler, turn off the
electrical supply going to it. Make sure that gas is
available at the gas valve inlet. Open the valves in
the hot water return and supply piping. Failure to
take these precautions will prevent the boiler from
operation properly.
Fill the boiler and all of the radiation with water. Make
sure that the system is completely purged of air, see
GENERAL PLUMBING GUIDELINES.
Review these instructions and make sure that the boiler
installation complies with ALL of the instructions up to
this point.
OPERATING INSTRUCTIONS
The GT boiler employs a pneumatic modulation system.
This modulation system increases or decreases the
speed of the blower to meet the heating demand. The
gas valve pressure regulator senses the air pressure and
adjusts the gas fl ow to ensure correct combustion.
WARNING: Before operating read and under-
stand the instructions contained in this manual.
Do not attempt to operate this boiler if it has
not been installed in accordance with the
guidelines set forth in this manual. Read and
fully understand the operating instructions in
the "For Your Safety Read Before Operating"
section of this manual. Failure to comply with
this WARNING could result in a fi re or explosion
causing severe personal injury or death!
Should overheating occur or the gas supply fail 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 appliance.
Do not use this appliance if any part has been under
water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the
control system and any gas control that has been under
water.
NOTE: The GT was tested with Natural Gas having a
heating value of 1020 BTU per cubic foot. For areas
with lower heating values, a combustion test is
required to obtain optimum operation.
WARNING: The input Screw MUST NEVER BE
ADJUSTED without verifying proper combustion
with a calibrated combustion analyzer. Failure to
comply with this warning can result in excessive
levels of carbon monoxide which can cause
severe personal injury or death!
GT INSTALLATION AND OPERATION INSTRUCTIONS
Table 7 contains the range for the CO, CO2 and NOx that
should be in a fl ue gas sample of a properly operating
boiler at maximum input.
Table 7 - Normal Flue Gas Composition
Carbon Dioxide CO2 %
Carbon Monoxide CO ppm
NOX ppm
Note: At maximum fan speed of 240 on the Sentry
display
The gas supply pressure to the boiler while running
at maximum rate must be between 4 to 9 in, 102 to
229 mm, W.C. for natural gas installations; 9 to 12 in, 229
to 305 mm, W.C. for propane installations. This pressure
can be measured on the gas valve using a manometer,
Figure 41. Ensure that the regulator is capable of
maintaining this pressure under all operating conditions.
The gas valve is also equipped with a manifold pressure
port, Figure 41.
Figure 41- Gas Valve Layout
Ignition System
A. Connect a manometer to the line pressure port
shown in Figure 41. Make sure that the gas supply
piping has been purged of air and that all gas joints
up to the gas valve have been thoroughly checked
for leaks. Wait at least fi ve minutes for any gas to
dissipate before turning on the electrical power.
B. Read, understand and follow the operating
instructions below.
Page 27
Natural Gas Propane
8-9.5 9-10.5
25-175 25-175
10-50 10-50