User Guide

21
110118-01 12/19
CG-F
Installation, Operating & Service Manual
9 System Start-up and Checkout (continued)
J. Check Main Burner Flame (see Figure 9-6)
1. NORMAL FLAME:
a. Clearly defined inner cone with no yellow
tipping.
b. Orange-yellow streaks caused by dust
should not be confused with true yellow
tipping.
2. ABNORMAL FLAME (if found, check inlet and
outlet gas pressure. Procedure found in
following steps):
a. Over fired - large flame
b. Under fired - small flames
c. Lack of primary air - yellow tipping on
flames.
K. Check gas inlet pressure
1. While boiler and all other gas appliances
are not firing, gas inlet pressure should not
exceed ½ psig.
2. While boiler and all other gas appliances
are firing, gas inlet pressure must be
between minimum and maximum shown
on rating label.
L. Check gas outlet (manifold) pressure
1. Install manometer on 1/8" outlet pressure
tap on gas valve (see Figure 9-3). Use
of shutoff valve between manometer and gas
valve can prevent pressure surge that blows
out manometer fluid.
2. Adjust regulator on gas valve so manifold
pressure matches values listed on rating label.
3. Turning regulator adjustment screw
clockwise () increases pressure.
4. Turning regulator adjustment screw
counterclockwise () decreases pressure.
M. Check gas input rate to boiler
1. When checking rate, ensure all other
appliances connected to same meter as
boiler are off.
2. Input ratings shown on boiler rating label
can be used for elevations up to 2,000 ft. For
elevations 2,000 ft. or higher, reduce input
rate to 4 percent per 1,000 ft. above sea level.
Do not install at elevations above 12,000 ft.
See Table below.
N. Measure carbon monoxide (CO) level in vent after
5 minutes of main burner operation. CO should
not exceed 400ppm air free.
O. Check vent damper operation.
Vent damper must be in open position when
appliance main burners are operating.
Input (MBH)
Boiler
Model
Rating
Label
5,000 ft. 7,000 ft.
10,000
ft.
CG30F 70 56 50 42
CG40F 105 84 76 63
CG50F 140 112 101 84
CG60F 175 140 126 105
CG70F 210 168 151 126
CG80F 245 196 176 147
CG90F 280 224 202 168
CAUTION
Avoid operating boiler in an environment where
saw dust, loose insulation fibers, dry wall dust,
etc. are present. If boiler is operated under
these conditions, burner interior and ports
must be cleaned and inspected daily to ensure
proper operation.
!
Figure 9-6: Main Burner Flame