750-177 6-1
CHAPTER 6
Adjustment Procedures
Note: If the boiler is not equipped with a
ProFire burner. Please refer to the specific
Operation and Maintenance manual for the
burner supplied.
A. GENERAL
Each Cleaver-Brooks boiler is tested for correct operation
before shipment from the factory. However, variable
conditions such as burning characteristics of the fuel and
operating load conditions may require further adjustment
after installation to assure maximum operating efficiency and
economy.
A combustion efficiency analysis made during the initial
start-up will help to determine what additional adjustments
are required in a particular installation.
Prior to placing the boiler into service, a complete inspection
should be made of all controls, connecting piping, wiring, and
all fastenings such as nuts, bolts and setscrews to be sure that
no damage has occurred, or that adjustments have not
changed during shipment and installation.
The adjustment procedures in Chapter 6 apply to standard
components furnished on steam or hot water boilers fired
with gas and/or the various grades of oil.
B. LINKAGE - MODULATING MOTOR
AND AIR DAMPER
The linkage consists of various arms, connecting rods, and
swivel ball joints that transmit motion from the modulating
motor to the metering valve, to the air damper, and to the gas
butterfly valve, if used.
When properly adjusted, a coordinated movement of the
damper and metering valves within the limits of the
modulating motor travel is attained to provide proper fuel-air
ratios through the firing range.
In linkage adjustments there are several important factors that
must serve as guides.
1. The modulating motor must be able to complete its full
travel range.
!
DANGER
CAUTION
Do not restrict the full travel of the modulat-
ing motor. Failure to follow these instruc-
tions could result in equipment damage.
A. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
B. Linkage - Modulating Motor & Air Damper . . . . . .6-1
C. Modulating Motor . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
D. Modulating Motor Switches -
Low Fire and High Fire . . . . . . . . . . . . . . . . . . . . . .6-2
E. Burner Operating Controls - General. . . . . . . . . . . .6-2
F. Modulating Pressure Control (Steam) . . . . . . . . . . .6-5
G. Operating Limit Pressure Control (Steam) . . . . . . .6-5
H. High Limit Pressure Control (Steam). . . . . . . . . . .6-5
I. Modulating Temperature Control (Hot Water). . . . .6-6
J. Operating Limit Temperature Control (Hot Water) .6-6
K. High Limit Temperature Control (Hot Water) . . . .6-6
L. Lowwater Cutoff Devices . . . . . . . . . . . . . . . . . . . . 6-6
M. Combustion Air Proving Switch . . . . . . . . . . . . . . 6-6
N. Gas Pilot Flame Adjustment . . . . . . . . . . . . . . . . . . 6-6
O. Gas Pressure and Flow Information . . . . . . . . . . . . 6-7
P. Gas Fuel Combustion Adjustment . . . . . . . . . . . . . . 6-8
Q. Low Gas Pressure Switch . . . . . . . . . . . . . . . . . . . . 6-9
R. High Gas Pressure Switch. . . . . . . . . . . . . . . . . . . . 6-9
S. Fuel Oil Pressure and Temperature - General . . . . . 6-9
T. Fuel Oil Combustion Adjustment . . . . . . . . . . . . . 6-10
U. Low Oil Pressure Switch . . . . . . . . . . . . . . . . . . . 6-11
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