Startup and checkout, Warning – Honeywell RA117A User Manual

Page 8

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STARTUP AND CHECKOUT

WARNING

FIRE HAZARD

CAN CAUSE SEVERE BURNS

Ensure the combustion chamber is free of oil or

oil vapor before starting system.

STEP THE PYROSTAT DETECTOR CONTACTS

The detector contacts are actuated by a friction clutch

that is mounted on a rod connected directly to the heat-

actuated element. Occasionally, this clutch gets "out of
step” after a long period of idleness. To place the clutch and

the contacts “in step,”

1. Remove the cover.

2. Pull the lever forward 1/4 inch (Fig. 8).

3. Slowly release the lever.
4. Replace the cover.

START THE SYSTEM

1. Ensure the Pyrostat detectors are in step.

2. Push in and release the safety switch reset button.
3. Open the hand valve in the oil supply line.
4. Set the limit control and thermostat to call for heat.
5. Close the line switch. The burner should start.

CHECK THE SAFETY FEATURES
Simulate Flame Failure:

1. Follow the starting procedure to turn on the burner.

2. Close the hand valve in the oil supply line.
3.

The RA116A locks out after 75 second (nominal)

safety switch timing. The RA117A and RA817A lock out

after one minute (approximate) scavenging period and 75

second (nominal) safety switch timing.

4. Reset the safety switch and open the hand valve in

the oil supply line.

Simulate Ignition Failure:

1. Follow the starting procedure to turn on the burner,

except do not open the oil supply hand valve.

2. Safety switch locks out after 75 second (nominal)

safety switch timing. Ignition and burner motor stops and

oil valve closes.

3. Reset the safety switch and open the hand valve in

the oil supply line.

Simulate Power Failure:

1. Follow the starting procedure to turn on the burner.

2. With the burner running, trip the circuit breaker or

remove the fuse to turn off power to the system. The burner

should stop.

3. Restore power. The burner should restart.

Check the Scavenger Timing:

1. Follow the starting procedure to turn on the burner.

2. With the burner operating normally, open and im­

mediately close the line switch. The burner should stop
immediately.

3. After recycle timing (one minute approximately), the

burner should restart automatically.

If the system does not operate as described, proceed to

Troubleshooting.

FIG. 8—STEPPING THE PYROSTAT DETECTOR CON­

TACTS.

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