Cleaver-Brooks CBH 40 - Page 11

boiler has a lead sulfide (infrared sensitive)
detector.
BURNER SWITCH (Figure 1-1)
A
manually operated start-stop switch used for di-
rectly starting and stopping burner operation.
FORCED DRAFT FAN MOTOR (Figure 1-1)
Directly drives a forced draft fan to provide com-
bustion air. Also referred to as blower motor. On
an oil fired unit the oil pump is driven from this
motor by a V -belt.
BLOWER
MOTOR
COMBUSTION
AIR PROVING
SWITCH
DAMPER
MOTOR
AUXILIARY
SWITCH
DAMPER
LINKAGE
BUTTERFLY
GAS
VALVE
BLOWER MOTOR
STARTER
Chapter 1-General Description and Principles of Operation
FORCED DRAFT FAN MOTOR STARTER
(Figure 1-1)
Energizes forced draft fan (blower) motor.
DAMPER MOTOR (Figure 1-1)
A
two position motor that positions the air damper
through a linkage system, to provide proper air-
fuel ratio under low fire and high fire conditions.
The motor is powered to the open position and
spring returned to the closed.
The motor actuates one or more auxiliary switches.
PROGRAMMING
AND FLAME
SAFEGUARD
CONTR.OL
-------mrTIMER
- DIAL
---------!!!!-GAS-OIL
SWITCH
----OIL
PUMP
OIL PRESSURE
GAUGE
FIGURE 1-l. TYPICAL OIL AND GAS FIRED MODEL CBH BOILER
1-3