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INSTRUCTIONS 

FOR OPERATING 

PREWAV 

*■ INSTANT LIGHTING ■*■ 




AMP-STOVE 



MODEL NO. P4821 



Do not lose or destroy this instruction folder, as it may 
be necessary for you to refer to it at times in order to 
operate and service your stove properly and econom- 
ically, and also to order replacement parts 



Prentiss -Waher^ Products Co. 

Manufacturers of 
GAS RANGES AND RANGETTES. • .WICK AND WICKLESS 
TYPE KEROSENE STOVES • CIRCULATING AND RADIANT 
POT TYPE OIL HEATERS • FLOOR FURNACES ^ CAMP 
STOVES • BLOW TORCHES • TRAILER STOVES 
PICNIC ICE BOXES \ 

Factory and General Offices 

Wisconsin Rapids, Wisconsin 



Form K3636 - 20M-10-48-hs. Printed in U. S. A. 



• IMPORTANT • 

This stove has been tested and will give safe, efficient 
pexfonnance ftoviding the instructions and the following 
simpk rules aie followed. 

L Do not pour or take gasoline near an open flame. 

2. Us0 only fufe, untreated, water-white gasoline. Gasolines 
containing Ethyl Lead, anti-knock compounds, or a 
disoolotea gasoluie wiU dog the generator quickly. 

3. Always keep gasoline in a clean, red container with 
vapor tight caps. 

4. Drain the gasoline container occasionally and rinse with 
fresh gasoline. 

5. Flush and dean tank on stove at intervals. 

6. When pouring gasoline, keep containers in contact with 
each otner. 

7. Be sure valves are closed and wing nut filler cap is tight 
before pumping air into the tank. 

"nKTCe^ Ihe^dunglnrute tight to prevent leaks. 

9. Rdease air pressure when transporting the stove. 

10. Drain the tank when stove is not to be used for a length 
of time. 

11. Do not use large utensils or oven which extends over 
front of stove. Flame could be deflected onto the tank. 

12. Do not close cover until flame on the burners is ex- 
tinguished. 

To Set Up Stove 

Set stove flat. Move the carrying handle vertically beneath 
the stove so that it acts as a support. Slide the cover catch 
to one side and open the cover. Raise the grate and remove 
the tank and generator assembly. Open the windshields and 
fasten to the windshield hooks. 

To Install Tank and Generator 

1. Insert the tin end of the generator in the opening in 
the mixing chamber. 

2. Hook the tank hangers over the front edge of the stove. 

3. Fit the vertical ends of the carrying handle in the lower 

slots o£ fhff ^anlf KarigpgB _- 

4. Lower the grate so that the bottom edge of the grate 
support fits in the grooves of the tank hangers. The 
generator tube will be in the slotted opening of the 
grate support 

5. The tank assembly and grate are now securely in posi- 
tion. See Picture 1. 

To Fill Tank 

1. Remove the tank assembly from the stove. 

2. Be sure generator and preheater valves are closed. 

3. Hold tank with the pump up. Unscrew the wing nut 
filler cap slowly to release any air pressure and remove the 
pump. Fill tank through the pump opening, about three- 
fourths full of pure, water-white gasoline. Replace pump 
and tighten the wing nut filler cap securely with the fingers 
to prevent leaks. See that the filler cap gasket is in good 
condition. 



To Pump Air Pressure 

l.With thumb and finger holding pump handle, pump 
35-50 complete strokes of air into the tank. 

2. Air can be pumped into the tank at any time, whether 
stove is in operation or not, as good air pressure is 
necessary to satisfactory perfotmance. 

To Light stove 

1. Replace tank assembly. See To Install Tank and Gen- 
erator. 

2. Secondary valve must be closed. Move valve rod UP 
as far as it goes. 

3. Open PREHEATER valve one complete turn counter- 
clockwise. 

4. Hold lighted match to the Master burner. Open GEN- 
ERATOR valve several turns to the left Burner will 
light at once. If flame is too high, partially close the 
GENERATOR. 

5. After about one minute, or when the flame begins to 
"float" on the burner, dose the PREHEATER valve 
(clock-wise). If this is not closed, the air pressure wiU 
go down rapidly. 

6. Stove is now operating. If the flame dies down, pump 
more air into tank. 



voi/j^e c/iTCff 




Do not fill tank near an of en flame. 



C2) 



PICTURE No. 1 

To Light Other Burner 

L Slide the secondary valve rod, connected to the second 
burner, out from die case. See Picture 1. 

2. Open generator more to supply additional gas. 

3. Push the valve rod DOWN to open the valve. 

4. Hold lighted match to burner head and burner will 
light at once. 

To Shut Off Stove 

1. Partially close generator. If the secondary burner is 
operating, move the valve rod UP to close it. 

2. Close generator gendy but firmly. Do not apply force 
or the valve stem and needle may be damaged. 

3. The flame will die out on the Master burner after gas 
in the generator tube is consumed. 



GENERAL INFORMATION 

TO CONTROL FLAME 

The generator will produce enough gas to operate both burners at full 
flame. Its capacity can also be reduced to supply just enough gas for a 
simmering flame with only one burner lighted. 

When the second burner is lighted, open generator more to produce 
additional gas. When a burner is shut off, partly close generator to reduce 
supply of gas. Keep generator open enough to keep generator tube hot, 
but do not open more than necessary, or a yellow, smoky flame will result. 

Regulate individual burner flame the same as on a gas stove. A slight 
move of control rod raises or lowers flame on the secondary burner, and 
Master burner is regulated by the generator. 

MANIFOLD AND BURNERS 

If lighting instructions are not followed closely, or generator Is car- 
bonized, condensation of gasoline may form in manifold causing a yellow 
flame. If condensation is not excessive, it will disappear as soon as it 
evaporates. If it does not, shut off the stove by closing generator. Remove 
tank assembly, be sure stove is cool and turn stove upside down, to drain 
the gasoline and wipe all burner parts dry. Make certain there is no open 
flame near when this is done. Replace tank assembly and re-light stove. 

Boiled-over foods or dust on the burners will also cause a yellow 
flame. Unscrew the bolts holding burner to the manifold, remove burner 
and clean the burner screen. If screen is burned out or warped, replace 
burner. See Parts List. 

If the second burner does not shut off, remove the burner cap by 

/of>«;pnmg fKp kiimpr r^p _hnlrs, «nd <'lpa " the ITod'^r 4>^ge nf thp ytfyp 

disc, and also the valve seat with emery cloth. Dirt or rust may be 
holding the valve partly open. Be sure gasket beneath the burner cap is 
in position and not damaged. 

AIR MIXTURE 

An Air Shutter is at the lower rear of the mixing chamber. This 
was adjusted correctly at the factory to supply the necessary amount of 
oxygen to mix properly with the gasoline vapor. If the flame on the 
burners is yellow when the generator and burners are clean, the Air 
Shutter can be pushed open a little more to provide additional oxygen. 
If the flame blows away from the burners, close the Air Shutter a trifle. 

THE TANK 

If the stove is not to be used for a length of time, and also at 
intervals, the tank should be drained. This will help prevent the formation 
of rust in the tank due to condensation. Gasolines contain a gummy 
substance which will settle on the bottom of the tank, and when the 
stove is again operated, this gum will clog the fuel feed tube and 
generator unless tank is drained and flushed periodically. 

To drain the tank, loosen the wing nut filler cap SLOWLY, to 
release the air pressure and remove the pump. The gasoline can be 
syphoned out through the pump opening with the use of the K2062 
Syphon (see Parts List), or unscrew the generator from the tank, and 
the gasoline can be poured out of the generator opening. DO NOT DO 
THIS NEAR AN OPEN FLAME. 

THE PUMP 
At intervals, apply a few drops of light oil to the pump leather to 
obtain proper compression. To oil or replace the pump leather, unscrew 
the pump barrel cap atid the pump plunger assembly can be pulled out 
of the barrel. 

To remove pump* check yalve for cleaning or replacing, remove 
pump assembly and with a wrench, unscrew the check valve from the 
md -or tLt? pump band. Ozdinanily rhc crieck valve retainer in tile valve 
requires replacing when the pump plunger comes out from the barrel. 

CARE OF THE GENERATOR 

The generator is the heart of your stove. It produces the gas by 
which the stove operates. It must be kept clean and in good condition, 
if the stove is to operate properly. The stove will not give satisfactory 
service if the generator is dirty or damaged. 

Generator needs cleaning when the valve is hard to turn, or when 
flame is yellow and smoky. Carbon has formed in the tube from the 
natural gums in the gasoline. 

We recommend that you buy an extra generator when you buy the 
stove so you will have a spare one on hand. (See Parts List) . When one in 
use needs cleaning, replace, and clean used one. See "To Clean Generator." 

TO CLEAN GENERATOR 

1. Unscrew the generator from the tank. 

2. Remove the fuel feed tube assembly from the generator casting and 
blow it out with compressed air, being careful not to enlarge any 
openings. Clean the screen in the filter tip carefully. 

3. Hold the generator tube in a vise, and with a small wrench, unscrew 
the packing nut from the casting. Remove valve stem and cleaning 
needle by turning the generator valve stem several turns to the left. 

4. Attach the wrench to the valve casting and unscrew it from the tube. 
Unscrew the gas tip from the end of generator tube, and with a piece 
of hooked wire, remove the generator coil from the inside of the tube. 
This will probably damage the coil so that it will have to be replaced 
with a new one. (See Parts List). 



5. With a piece of stiff wire sharpened to a chisel point, scrape the 
inside of the tube free of all carbon, and wash it out with clear, 
white gasoline. With a piece of cloth dipped in gasoline, and on the 
end of a wire, clean tube carefully to remove all carbon particles. 
If the tube is bent or damaged, replace it. (See Parts List). 

6. Unscfew packing nut of preheater valve and remove valve stem. If 
the packing ring is worn, replace to prevent leaks. Also examine 
packing ring on generator valve stem and replace if necessary. (See 
Parts List). 

7. Re-install preheater valve stem in casting, tightening packing nut 
tight enough so valve does not turn hard. 

8. Replace gas tip into end of the tube, tight, and screw generator 
casting on the other end. Insert the valve stem and cleaning needle 
into the tube, being careful that the needle point is not bent or 
damaged. If it is, replace the cleaning needle. (See Parts List). 
When the generator is closed, the tip of the needle point should 
extend through the tip about one-sixteenth of an inch. (1/16"). 

9. Screw the packing nut onto the casting, firmly, to prevent leaks at 
that connection. Screw the fuel feed tube assembly into the generator 
casting and after applying thread paint, or common laundry soap to 
the threads of the generator casting to prevent leaks, screw assembly 
into the tank. 



SERVICE SUGGESTIONS 



IF FLAME £S DTSCOLCfRHU OR^STDGGISHT "^ 

1. Low air pressure. Pump air into tank whenever needed. 

2. Improper grade of gasoline. See "Important." 

3. Carbonized generator. Clean. See "To Clean Generator.*' 

4. Incorrect lighting. See "Manifold and Burners." 

5. Enlarged orifice in gas tip or bent needle point. Replace parts. 

6. Bent generator tube. Replace. 

7. Air mixing chamber clogged with impurities. Clean. 

8. Air Shutter closed. See "Air Mixture.** 

IF FLAME GOES OUT: 

1. Fuel tatik empty. Re-fill. 

2. Lack of air pressure. Pump more air into tank. 

3. Loose carbon in generator. Clean. See "To Clean Generator." 

4. Fuel feed tube or filter tip clogged. Clean. See *'To Clean Generator.** 

5. Preheater not closed soon enough. See paragraph 5, "To Light Stoye.** 

6. Air Shutter open too far. See "Air Mixture.** 

IF GENERATOR LEAKS GASOLINE: 

1. If at tip end: Worn or damaged generator valve stem. Replace 
valve stem. See Parts List, 

2. If at stem end: Worn packing. Replace. Loose packing nut. Tighten. 

IF TANK LOSES AIR PRESSURE: 

^ 1. Preheater valve not closed. Sp? ''^- ^ ^"^^t S--'^-- " 
2.- Ptclicnttr yalve - stem v 

3. Worn or damaged filler cap RasKui. ivtuiati;. 

4. Worn check valve. Replace valve or cork check retainer. 

5. Damaged or loose tank bushings. Replace tank. 

IF PUMP FAILS TO OPERATE: 

1. Pump leather dry or worn. Oil leather with light oil or replace. The 
leather must fit smoothly against wall of the pump barrel. See 
"The Pump.'* 

2. Pump check valve worn. Replace. See "The Pump.** 

IF BURNERS DO NOT SHUT OFF: 

1. Worn or damaged generator valve stem. Replace, (for Master burner): 

2. Dirt or rust in valve seat of secondary burner. See Manifold and 
Burners..** 

IF STOVE POPS AND BLOWS OUT: 

1. Screen in burner cap burned out or warped. Replace burner cap, 

2. Burner cap loose. Tighten bolts. 

3. Burner cap warped. Replace. 

4. Loose carbon in generator. Clean. See "To Clean Generator.** 

5. Burner cap gasket broken or missing. Replace. See Parts List. 




(3) 



^ HOW TO ORDER REPAIR PARTS 

1. Order repair parts from the Dealer through whom you purchased the stove. 

2. If the Dealercannot supply your needs, send the order to us and we will ship it direct. Give us the name and address of your Dealer. Enclose your remittance, 
including sufficient for transportation costs. We maintain a minimum charge of 25c per invoice and to avoid this charge, your parts order should total that 
amount or more. 

3. All parts orders must be made out in accordance with the Parts JDiagram and Parts List below. Be sure to give the Part Number, the Name of the Part, and the 
Model Number of the stove. The Model Number is stamped in the grate support. Your orders will then be filled correctly and promptly, 

PARTS DIAGRAM 

Compare Number in Parti Diagram 
to Parts List to Obtain Part Numbers 
and Name of Parts, 




PARTS LIST 

Parts Prices Subject to Change Without Notice. 



Diag. No. 


Part No 


1 


Y3423 


2 


Y3428 


3 


Y3429 


4 


Y3430 


5 


K1074 


6 


K1073 


7 


K1606 


8 


KI601 


9 


K1075 


10 


K1607 


11 


KU60 


12 


K1602 


13 


Y3431 


14 


SI 349 


15 


K3391 


16 


Y3466 


17 


Y3432 


18 


K1130 


19 


K1127 


20 


Y1937 


'21 


■'Y1929 


22 


Z713 


23 


Y169 


Not nius. 


Y1923 



Name of Part 

TANK AND FITTINGS 

Tank only 

Pump complete 

Pump plunger complete 

Pump rod and handle 

Pump barrel cap 

Pump rod spring . . . 

Pump plunger washer - outer 

Pump leather spacer 

Pump leather 

Pump plunger washer - inner 

Pump leather lock washer 

Pump rod nut 

Pump barrel 

Wing nut filler cap . . 

Filler cap gasket 

Check valve complete 

Check valve retainer 

Check valve retainer spring . 

Check valve stem guide 

GENERATOR PARTS 

Generator complete 

Generator casting 

Fuel feed tube 

Filter tip 

Generator valve stem and needle assembly 



Pria 



each 


Diag, No. 


Part No, 




24 


Y1932 


2.65 


25 


K1267 


1.85 


26 


K1269 


.90 


27 


K1270 


.45 


Not nius. 


T1160 


.20 


28 


Z810 


.05 


29 


Z203 


.05 


30 


Y1934 


.05 


31 


Z202 


.05 


32 


Y1936 


.05 






.05 


33 


Y3001 


.05 


34 


Y3003 


1.05 


Notlllus, 


^K2372 


.40 


35 -^- 


- K2471 


.05 


36 


Y1921 


.30 


Notlllus. 


K2666 


.15 


Notlllus. 


K1599 


.05 


Not Illus. 


K2575 


.15 


Not Illus. 


Y1920 




37 


Y2997 


2.45 


> 38 


T3112 


.80^ 


^ 39 


Y2998 


.40 


40 


T3110 


.15 


41 


T3111 


.80 


Not nius. 


K2062 



(4) 



Name of Part Price each 

Generator valve stem - less needle 55 

Packing nut - generator and preheater 20 

Packing ring - asbestos - generator and preheater 10 

Packing gland - generator and preheater .10 

Stop ring . generator and preheater 05 

Cleaning needle .35 

Gas tip 20 

Tube and coil .55 

Coil 15 

Preheater valve stem assembly . 55 

MANIFOLD AND BURNERS 

Manifold complete 2.10 

Burner cap .35 

Burner cap gasket 10 "* ' 

Burner cap bolt 05 -" ^ 

Secondary valve rod 55 

Secondary valve bolt .05 

Secondary valve spring 05 

Secondary valve nut , , .05 

Secondary valve tappit . 25 

Grate 55 

Grate support 25 

Case and cover complete 3.15 

Windshield - right 55 

Windshield - left 55 

Syphon 90