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3
Basic Operation
A.
General.
This water boiler utilizes fan-assisted
combustion and is equipped with controls for proper
operation. All controls must be in proper working order.
Contact a qualified service agency to provide annual
maintenance as specified in Installation, Operating and
Service Instructions.
1. Limit. See Figure 1. A device which automatically
interrupts boiler operation when the water
temperature exceeds the set point. Maximum
allowable temperature is 220°F.
Original equipment with this boiler is U.S. Boiler
IQ Control and Limit Rated Sensor combination.
The IQ Control shuts off boiler main burners when
boiler water temperature exceeds pre-programmed
IQ control water temperature set point. Boiler main
burners will re-light automatically, providing the call
for heat is present, when boiler water temperature
falls below pre-programmed control water
temperature set point less the set point differential.
2. Flame Rollout Switch. See Figure 1. A device
which automatically interrupts boiler operation
when flames or excessive heat are present in the
combustion area enclosure. The control is a single
use device. The control is located in the combustion
area enclosure. If the control was activated to
interrupt boiler operation, do not attempt to place
boiler in operation. Contact a qualified service
agency.
WARNING
Service on this boiler should be undertaken only
by trained and skilled personnel from a qualified
service agency.
3. Pressure Switch. See Figure 1. A device which
automatically prevents or interrupts boiler
operation when the induced draft blower fails to
move sufficient combustion air for proper burner
operation. Boiler operation resumes automatically
when sufficient combustion air flow is reestablished.
4. Electronic Ignition System. The Electronic Ignition
(EI) System consists of:
a. a solid state ignition control module to initiate,
monitor and stop burner operation. See Figure 1.
b. a combination gas valve to regulate gas flow to
the burners. See Figure 1.
c. a pilot burner to provide the ignition source for
the main burners. See Figure 4.
B.
Instructions to place the boiler in operation and to turn
off the boiler are shown on the Operating Instruction
Label posted on the left jacket panel of the boiler. The
Operating Instruction Label is shown in Figure 2.
C.
The Sequence of Operation is shown in Figure 3.
CAUTION
Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the electrical
supply to the pump. Instead, shut off the gas supply at a location external to the appliance.
En cas de surchauffe ou si I'admission de gaz ne peut étre coupée, ne pas couper ni débrancher
l'alimentation électrique de la pompe. Fermer plutôt le robinet d'admission de gaz à l'extérieur de I'appareil.
Do not use this boiler if any part has been under water. Immediately call a qualified service technician to
inspect the boiler and to replace any part of the control system and any gas control which has been under
water.