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Servicing procedures – Raypak 0180B User Manual

Page 22

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4. SERVICING PROCEDURES

GENERAL LOCATION OF CONTROLS

Fast

Response

Temperature

Sensor

CONTROL BOX COMPONENT

LOCATIONS MODELS 135 & 180

2-Staged Controller

Relay

Fig.# 8195.1

Ignition Module

(Auto Ignition Only)

22

Fig.# 8195.4

SEQUENCE OF OPERATION

INTERMITTENT IGNITION DEVICE (IID)

Boilers equipped with the IID system will automatically light the pilot burner first and then the main burner, each

time there is a call for heat from the room thermostat. Whenever the room thermostat is calling for heat, the

circulator supplied with the boiler, will be energized and should be running. The ignition control module will also

be energized to initiate the pilot ignition by opening the first main valve (pilot). At the same time, the electronic

spark generator in the module produces a high voltage spark pulse output that lights the pilot burner. If the pilot

burner does not light, the module will not energize the second main valve and the burners will not light. Ignition

spark continues only until the timed trial for ignition period ends. Then, the module goes into safety shutdown or

lockout. Lockout de-energizes the first main valve operator and closes the first main (pilot) valve in the gas control,

stopping pilot gas flow. The ignition control system must be reset by setting the thermostat below room

temperature for one minute or by turning off power to the module for one minute. When the pilot flame is

established, flame rectification circuit is completed between the sensor and burner ground. The flame sensing

circuit in the module detects the flame current, shuts off the spark generator and energizes the second main valve

operator which opens the second main valve. This allows gas to flow to the burners where it is ignited by the pilot

burner flame. When the thermostat is satisfied, the valve operators are de-energized shutting off the pilot and main

burners, and also the circulator.

CIRCULATOR

VENT SENSOR

BYPASS VALVE

(MODELS 135 & 180 ONLY)

BYPASS LINE

TEMPERATURE
AND PRESSURE GAUGE

2-STAGED CONTROLLER

(MODEL 90 ONLY)

PRESSURE
RELIEF VALVE

RELAY

ADJUSTABLE
HIGH LIMIT

FIELD WIRING
COMPARTMENT

FAST RESPONSE
TEMPERATURE SENSOR

IGNITION MODULE

(AUTO IGNITION ONLY)

TRANSFORMER

ROLL-OUT SENSOR

GAS VALVE

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