750-177 5-1
CHAPTER 5
Adjustment Procedures
A. General 5-1
B. Linkage - Modulating Motor &
Air Damper 5-2
C. Modulating Motor 5-2
D. Modulating Motor Switches - Low F
ire and High Fire 5-2
E. Burner Operating Controls - General 5-2
F. Modulating Pressure Control (Steam) 5-5
G. Operating Limit Pressure Control (Steam) 5-5
H. High Limit Pressure Control (Steam) 5-5
I. Modulating Temperature Control (Hot Water) 5-6
J. Operating Limit Temperature Control (Hot Water) 5-6
K. High Limit Temperature Control (Hot Water) 5-6
L. Low Water Cutoff Devices 5-6
M. Combustion Air Proving Switch 5-6
N. Gas Pilot Flame Adjustment 5-7
O. Gas Pressure and Flow Information 5-7
P. Gas Fuel Combustion Adjustment 5-8
Q. Low Gas Pressure Switch 5-9
R. High Gas Pressure Switch 5-10
S. Fuel Oil Pressure and Temperature - General 5-10
T. Fuel Oil Combustion Adjustment 5-12
U. Low Oil Pressure Switch 5-12
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 d
uring 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 b
e 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
boi
lers fired with gas and/or the various grades of oil.
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