Raypak RP2100 ASME Operations Instructions download pdf (Page 43)

MAIN BURNER AND ORIFICE REMOVAL -

ATMOSPHERIC MODELS

1. Remove burner tray.

2. Remove screws and burner hold-down bracket.

NOTE: If the heat exchanger is sooted badly, the

burner hold-down bracket and spacer can become dis-

torted from direct-flame impingement and this usually

ecessitates replacement of these parts.

3. Lift burners from slotted spacers and slide from ori-

fices. Clean with a wire brush.

4. Orifices usually do not need to be replaced. To

clean, run either copper wire or wood toothpick

through orifice. Do not enlarge hole. To remove

orifice, use a socket wrench and remove from

manifold. DO NOT overtighten when reinstalling.

PILOT

BURNER

HOLD-DOWN

BRACKET

GAS

ORIFICE

GAS VALVE

BURNER TRAY REMOVAL -

ATMOSPHERIC MODELS

1. Shut off main electrical power switch to heater.

2. Shut off gas upstream of heater.

3. Remove front door.

4. Disconnect gas line from gas valve.

5. Remove (2) screws that mount burner tray to unit,

and (2) screws that secure gas valve to jacket.

6. Disconnect wires that terminate at gas valve.

7. Disconnect hi-tension wire from PC board.

8. Slide out burner tray.

9. Reverse above procedure to reinstall.

GAS VALVE REMOVAL -

ATMOSPHERIC MODELS

1. Shut off gas supply to the heater. Remove gas

piping to gas valve inlet.

2. Disconnect wires, pilot tubing and bleed line, if

required.

3. Remove burner tray from heater.

4. Turn vertical gas pipe from manifold slightly and

unscrew gas valve.

5. Reverse above procedure to reinstall.

HIGH LIMIT REMOVAL

1. Shut off main electrical

ower switch to heater.

2. Remove inlet/outlet

inspection panel.

3. Remove defective high

limit and replace with a

new high limit.

4. Replace inspection panel.

PILOT SAFETY - Millivolt Models

Heaters equipped with the standing pilot (millivolt sys-

tem) have pilot generators which act as a safety

device to shut off the flow of gas to the main burners

and the pilot burner in case the pilot flame is extin-

guished. The pilot burner must be manually re-lighted

to place the heater in operation again. Refer to the

lighting instructions provided on the heater label.

PILOT SAFETY - Digital/AFT Models

The heater employs a pilot safety which closes the

main gas valve within 8/10ths of a second whenever

the pilot flame is interrupted. The pilot flame is auto-

matically lit when the device is powered. The heater

performs its own safety check and opens the main

valve only after the pilot is proven to be lit.

206-406

Atmospheric

NOTE: An erratic high limit is often characteristic of an

internal heat exchanger problem, e.g. scale build-up,

defective bypass. Refer to Troubleshooting section (on

pg. 47).

PILOT REMOVAL AND CLEANING

1. Disconnect pilot tubing and wires from gas valve.

2. Remove pilot assembly from burner tray.

3. Remove pilot from bracket.

4. Remove pilot orifice and air opening (Honeywell

MV unit only), and clean with wire or small brush.

CAUTION! Do not enlarge hole in pilot orifice.

5. Reverse above procedure to reinstall.

Pilot Pilot

Air

Opening

Orifice

HONEYWELL MILLIVOLT

PILOT

ROBERTSHAW MILLIVOLT

PILOT

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Raypak RP2100 ASME Operations Instructions Page 43

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