SRA 350 User manual

1
350 H2O Welder
Operating Manual
Congratulations on the purchase of your SRA-350 H20 Welder. With this welding
unit you can now experience the many advantages of the H20 welding process.
The SRA-350 has been designed to use low voltage electricity to dissociate water
into hydrogen and oxygen. It is safe, simple and reliable and ideal for quick, clean
soldering and brazing.

2
TABLE OF CONTENTS
Features …………………………………………………………………………………………….……..……..3
Package Contents………………………………………………………………………………….………….3
Specifications……………………………………………………………………………………………………3
Safety Precautions………………………………………………………………………………….………..4
Welder Diagram………….……………………………………………………………………….…………..5
Part List for Welder Diagram………………………………………………………………………….…6
Using the H20 Welder…………..……………………………………………………………….…………7
Routine Maintenance..…………..………………………………………………………………………..9
Tip Size Chart and Gas Reading……………..………………………………………………………..11
Warranty Information………..………………………………………………………………………..…12
24 Walpole Park South, STE #10
Walpole, MA 02081
508-688-6044
1-800-545-4570
www.sra-shops.com

3
Features and Package Contents
Features:
Clean Pin Point Flame with Temperatures Up to 5000°F from a Pen Size Torch.
The torch tip is a hydro dermic needle.
Electronic indicator lights for distilled water level.
Package Contents:
2 torches
Electrolyte
Tips
Torch Stand
Specifications:
Model
Size
Weight
Max Power Watts
Current
SRA-350
15x11x14’’H
55 lbs.
476
110 or 220V

4
SAFETY PRECAUTIONS
CAUTION
BEFORE SETTING UP, OPERATING OR MAINTANING THIS
MACHINE, PLEASE READ THE ENTIRE CONTENTS OF THE
MANUAL CAREFULLY. MAKE SURE YOU UNDERSTAND THE
SAFETY RULES AND HAZARDS FOUND BELOW AND
THROUGHOUT THE OPERATING MANUAL
Please Refer to the Following Safety Standards:
NEVER unscrew the water tank or booster tank unless the machine is turned off
NEVER use metal prongs or wire in the water tank
NEVER change tips without first putting out the flame. The machine can remain
on when removing tips.
NEVER light torch until you can feel a sufficient amount of gas coming from the
tip of the torch
NEVER turn the machine on when the booster tank is EMPTY
WARNING! AVOID ANY CONTACT WITH CAUSTIC SOLUTION. It is very corrosive.
Avoid contact with eyes or skin. If in contact with skin wash immediately with
water to avoid caustic burns.
WARNING! DO NOT have a lit cigarette or open flame near the machine when
either tank is open or when maintenance is being done on the machine.

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WELDER DIAGRAM

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PARTS LIST FOR WELDER DIAGRAM
#
PART DESCRIPTION
#
PART DESCRIPTION
#
PART DESCRIPTION
#
PART DESCRIPTION
1
Three position
switch
16
Torch hose fitting
31
Power cable
46
Tank cover
2
Safety cap
17
Fitting 1/8’’
32
Cover
47
Minimum level
sensor
3
Filling neck
18
Flame arrester cap
33
Rubber ring
48
Maximum level
sensor
4
Power control
knob
19
Shut off valve
34
Handle
49
Tank O-ring
5
Minimum level
indicator light
20
Gas production level
35
Fan motor 110v-
220v
50
Tank
6
Maximum level
indicator light
21
Brass screw for check
valve
36
Real panel
51
Flame arrester
7
Booster
22
Cao & tee screw O-
ring
37
8a Fuse
52
Flame arrester seat
O-ring
8
Tee Screw
23
Check valve
38
Fuse holder
plug
53
Valve gasket
9
Booster holder with
1/8’’ fitting
24
Booster seal gasket
39
Resistor 1x10K220v
2x10k1110v
54
Flame arrester
gasket
10
Torch
25
Check valve O-ring
40
Power transformer
220v –110v
55
Pressure switch
11
Tips
26
Level circuit board
41
Fitting 1/8 90°
56
Separator
12
On indicator light
27
Rectifier diodes
42
Rilson tube
4x6mm
57
Rod Ø 8mm
13
Check valve cap
28
220K rheostat
43
Nut 8 MA
58
Power control circuit
board 110v-220v
14
Torch holder / stand
29
Aluminum base plate
44
Washer 8 mm
59
Copper conductors
15
Torch Hose
30
Front panel
45
Insulator Ø 8mm
60
RFI suppression
filter

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USING THE H20 WELDER
Start Up:
1. Plug the electric cord to the appropriate 110V 220V electrical outlet.
2. Locate the chrome cap on top of the cabinet. This is the water tank
inlet spout. Turn the toggle switch to the REFILL position. The
greenish yellow minimum light will go on.
a. Pour the entire contents of caustic “B” electrolyte solution into
the water tank using the large funnel.
CAUTION: The electrolyte solution contains a strong caustic. If any
contact occurs with skin, wash immediately with water. Avoid
contact with eyes.
b. Fill the empty bottle approximately 1 2/3 full of distilled water.
Carefully pour into the ware tank and STOP IMMEDIATELY
when the RED light goes on. The water tank is full. Now screw
the water tank cap on tight.
NOTE: As you start pouring distilled water into the tank, the
minimum light will go off. Now both lights will be off until the red
maximum light goes on.
3. Find the booster tank located in the front of the cabinet. Unscrew
the T-handle to remove the booster tank. Carefully pour methyl
alcohol (also known as Methanol) into the tank, use the small funnel
so that fluid does not enter the center section of the tank.

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NOTE: Boric acid powder can be added to the methyl alcohol
solution in a ratio of .5 to .7 ounces per quart. This should be
premixed. Boric acid with methyl alcohol provides a reducing
characteristic to the flame. This will keep your parts cleaner when
brazing (hard soldering).
a. Fill the booster tank to the fill mark. Screw the booster tank
back in place with the T-handle. Tighten the T-handle finger
tight.
4. Turn to the tip selection chart and select the desired tip size. Turn
toggle switch to the ON position. The red light will come on. Turn the
power control to the position so that the meter readings correspond
to the tip sizes. Wait 30 seconds to 1 minute until you feel a
sufficient amount of gas coming out of the tip. Usually you can hear
gas bubbling in the booster tank. When this occurs, light the torches.
a. If more gas is required turn knob to a higher position within the
chart range.
b. Conversely, if less gas is required, turn the knob to a lower
position.
CAUTION: NEVER run the machine with the meter needle in the red
area.
5. To turn off the machine, first put out the flame by pushing in the
shut off at the back end of the torch. When the flame is out, shut off
the machine.

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Routine Maintenance
It is essential to perform daily maintenance on your welder. Each day
before starting your SRA H20 Welder, perform the following steps and
cautions:
1. Remove the booster tank and check the level of methyl alcohol
solution. If required, add solution till it reaches the maximum level
mark. EVERY FOUR HOURS OF RUNNING TIME CHECK THE LEVEL
AND FILL. At the end of 12-16 hours of running time, empty the tank
and wash in hot water. Dry the tank and pour in a new solution.
NOTE: BEFORE REMOVING THE CAP FROM THE DISTILLED WATER
TANK, FIRST REMOVE THE ALCOHOL BOOSTER TANK FROM THE
MACHINE, AND THEN REMOVE THE CAP. THIS WILL PREVENT
ALCOHOL FROM BEING SUCKED BACK INTO THE DISTILLED WATER
TANK, WHICH WOULD CAUSE CONTAMINATION OF THE SOLUTION.
2. Check the water level by turning the toggle switch to REFILL position.
Observe the water level indicator lights.
a. If the maximum RED light is on DO NOT add distilled water.
b. If both lights are off, or yellow minimum light is on, unscrew
the water tank cap and add distilled water. STOP IMMEDIATELY
WHEN THE RED LIGHT COMES ON.
Warning! DO NOT add distilled water beyond the maximum point
when the red light comes on. Too much water in the tank will cause
water to accumulate in the plastic torch hoses. This results in an
inconsistent flame. Screw the cap back on tight.

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c. If minimum greenish yellow light comes on, DO NOT operate
the machine. Fill with distilled water until the red light comes
on.
NOTE: When operating the machine the red light will go off and no
lights will be on. This is normal operating level. When greenish
yellow light goes on STOP IMMEDIATELY and add distilled water.
NEVER OPERATE THE MACHINE WHEN THIS MINIMUM LIGHT IS ON.
3. Screw the water cap on tight.
a. When filling with distilled water, the minimum light will go off
first. Both light will be off until the full mark is reached. At that
time the red light will go on.
4. Screw the booster tank back to the booster holder with T-handle.

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TIP SIZE AND GAS READING
SELECTION CHART FOR TIP SIZE & GAS READING
NUMBER OF
TORCHES
GAUGE
I.D.
COLOR
GAS METER
RANGE
1
25
.010
RED
20-30
2
25
.010
RED
25-40
1
23
.013
ORANGE
25-35
2
23
.013
ORANGE
35-50
1
22
.016
BLUE
30-40
2
22
.016
BLUE
45-60
1
21
.020
LT PURPLE
35-45
2
21
.020
LT PURPLE
60-80
1
20
.023
PINK
45-80
2
20
.023
PINK
65-80

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Warranty Information
1-YEAR LIMITED WARRANTY
Your H20 welder is warranted to the original purchaser for 1 year
from the date of purchase; to be free from defects in materials and
workmanship (but not against damages caused by misuse, negligence,
accident, and faulty installation or by using materials incompatible with
the equipment.)
SRA Soldering Products
www.sra-solder.com