Adjustment Procedures Chapter 6
750-177 6-9
MODEL
NO.
STD GAS
TRAIN
SIZE
(IN.)
MIN GAS
PRESSURE
(IN. WC)
BURNER
MODEL
FLX-150 2.0 3.7 GP-700-1-1.5
FLX-200 2.0 6.3 GP-700-1-2.0
FLX-250 2.0 8.1 GP-700-1-2.5
FLX-300 2.0 8.0 GP-700-2-3.0
FLX-350 2.0 11.0 GP-700-2-3.5
FLX-400 2.0 13.3 GP-700-2-4.0
FLX-450 2.0 16.9 GP-700-2-4.5
FLX-500 2.0 21.4 GP-700-3-5.0
FLX-550 2.0 19.0 GP-700-3-5.5
FLX-600 2.0 22.6 GP-700-3-6.0
FLX-700 2.0 23.8 GP-700-3-7.0
FLX-800 2.0 38.4 GP-700-3-8.0
FLX-900 2.0 48.3 GP-700-3-9.0
FLX-1000 2.5 31.2 GP-700-4-10.0
FLX-1100 2.5 37.9 GP-700-4-11.0
FLX-1200 3.0 37.2 GP-700-4-12.0
NOTES:
1. Table is based on 1,000 Btu/cu-ft natural gas and elevation up
to 1,000 ft.
2. Minimum gas pressure also applies to 200 fuel series burner.
3. Standard regulators suitable for 1 psig maximum inlet pressure.
Q. LOW GAS PRESSURE SWITCH
Adjust the scale setting to slightly below the normal burning
pressure. The control circuit will be broken when pressure
falls below this point. Since gas line distribution pressure
may decrease under some conditions, shutdowns may result
if the setting is too close to normal. However, regulations
require that the setting may not be less than 50% of the rated
pressure downstream of the regulator.
Manual resetting is necessary after a pressure drop. Press the
reset lever after pressure is restored. Be sure that the mercury
switch equipped control is level.
R. HIGH GAS PRESSURE SWITCH
Adjust the scale setting to slightly above the normal burning
pressure. The control circuit will be broken when pressure
exceeds the normal operating pressure. Unnecessary
shutdowns may result if the setting is too close to normal;
however, regulations require that the setting may not be
greater than 150% of rated pressure.
Manual resetting is necessary after a pressure rise. Press the
reset lever after pressure falls. Be sure that the mercury
switch equipped control is level.
S. FUEL OIL PRESSURE AND
TEMPERATURE - GENERAL
Variations in burning characteristics of the fuel oil may
occasionally require adjustments to assure highest
combustion efficiency. The handling and burning
characteristics may vary from one delivery of oil to another.
Therefore, it is recommended that the oil system be inspected
from time to time to verify that pressures and viscosity are at
the proper operating levels.
REGULATOR INLET
PRESSURE (PSIG)
PRESSURE FACTOR
11.05
21.11
31.18
41.25
51.32
61.39
71.45
81.53
91.59
10 1.66
11 1.72
12 1.81
13 1.86
14 1.93
15 2.00
Table 6-2: Pressure Correction Factors
MODEL NO. 150 200 250 300 350 400 450 500 550 600 700 800 900 1000 1100 1200
Fuel Consumption Gas (cfh)
A
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 7000 8000 9000 10000 11000 12000
A. Natural Gas @ 1000 Btu/cu-ft.
Table 6-1: Hot Water and Steam Boiler Ratings
Table 6-3: Minimum Required Gas Pressures
To Next Page
Loading...
