Raypak WH 0195A User Manual download pdf (Page 16)

SERVICING

PROCEDURES

General Location of Controls

Sequence of Operation

Intermittent Ignition Device (IID)

Heaters equipped with the IID system will automatical-

ly light the pilot burner first and then the main burner,

each time there is a call for heat from the tankstat.

Whenever the tankstat calling for heat, the circulator

supplied with the heater, 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 genera-

tor 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 lock-

out. Lockout de-energizes the first main valve operator

and closes the first main (pilot) valve in the gas con-

trol, stopping pilot gas flow. The ignition control system

must be reset by setting the tankstat below water tem-

perature 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 genera-

tor 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 burn-

er flame.

When the tankstat is satisfied, the valve operators are

de-energized shutting off the pilot and main burners,

and also the circulator.

Start-up Procedures

Filling the System

Fill system with water. Purge all air from the system

using purge valve sequence. After system is purged of

air, lower system pressure. Flush system before put-

ting into operation to ensure that foreign material does

not damage pump seals.

Checking the Circulator

Before lighting the heater and after system is filled,

make sure that circulator is operating properly. Manual

gas valve should be off.

NOTE: Circulator motor supplied with the heater

does not require lubrication.

Ignition Module

(Auto Ignition Only)

Fig.# 8195.3

Circulator

Manual Reset Limit

(in heater behind panel)

Pressure

Relief Valve

Field Wiring

Compartment

Temperature Sensor

Ignition Module

(Auto Ignition Only)

Transformer

Roll-Out Sensor

Gas Valve

Fig. 8: General Location of Controls

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 27 28

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Raypak WH 0195A User Manual Page 16

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