*■ INSTANT LIGHTING ■*■
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.
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
5. Flush and dean tank on stove at intervals.
6. When pouring gasoline, keep containers in contact with
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
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-
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
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
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-
2. Secondary valve must be closed. Move valve rod UP
as far as it goes.
3. Open PREHEATER valve one complete turn counter-
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
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.
Do not fill tank near an of en flame.
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.
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.
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.
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.
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
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.
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
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
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.
^ 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,
Compare Number in Parti Diagram
to Parts List to Obtain Part Numbers
and Name of Parts,
Parts Prices Subject to Change Without Notice.
Name of Part
TANK AND FITTINGS
Pump plunger complete
Pump rod and handle
Pump barrel cap
Pump rod spring . . .
Pump plunger washer - outer
Pump leather spacer
Pump plunger washer - inner
Pump leather lock washer
Pump rod nut
Wing nut filler cap . .
Filler cap gasket
Check valve complete
Check valve retainer
Check valve retainer spring .
Check valve stem guide
Fuel feed tube
Generator valve stem and needle assembly
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
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 support 25
Case and cover complete 3.15
Windshield - right 55
Windshield - left 55