Raypak Versa 105B User Manual

Page 23

BURNER DRAWER REMOVAL

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.
6. Disconnect wires that terminate at gas valve.
7. Slide out burner tray.
8. Reverse above procedure to reinstall.

GAS VALVE REMOVAL

1. Remove burner tray. (See burner tray removal

procedure).

2. Disconnect pilot tubing from gas valve.
3. Remove gas valve with manifold from burner tray.
4. Remove manifold from gas valve.
5. Reverse above procedure to re-install.

MAIN BURNER AND ORIFICE REMOVAL

1. Remove burner drawer. (See burner drawer re-

moval procedure).

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
distorted from direct flame impingement and this usu-
ally necessitates replacement of these parts.

3. Lift burners from slotted spacers and slide from

orifices. 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 REMOVAL AND CLEANING

1. Remove burner drawer. (See burner drawer re-

moval procedure).

2. Disconnect pilot tubing, disconnect wires from gas

valve.

3. Disconnect pilot bracket from burner shield.
4. Remove pilot from bracket.
5. 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.

6. Reverse above procedure to re-install.

HEAT EXCHANGER REMOVAL

1. Shut water, gas, and electricity off, close valves and

relieve pressure.

2. Drain heat exchanger.
3. Loosen and remove flange bolts.
4. Remove flange and inlet/outlet pipes from the

header.

5. Remove outdoor stackless top or indoor stack top

from unit.

6. Remove jacket top, flue collector, and baffles.
7. Remove upper front jacket panel, and disconnect

wires at toggle switch.

8. Remove capillary bulb from inlet/outlet header.
9. Disconnect press switch tube from return header.
10. Disconnect hi-limit wire from thermostat, and pres-

sure switch.

11. Lift heat exchanger straight up from combustion

chamber, using caution not to damage refractory.

12. Reverse above procedure to re-install.

Pilot

Air
Opening

Orifice

HONEYWELL PILOT

ROBERTSHAW PILOT

Fig. # 8045.1

Fig. # 8102.0s