Heat Wise SU-2A Manual page 5

Before connecting the burner to the gas supply, insure that the gas pipes and service meter
are large enough to permit the additional load of the gas burner (see Chart 2).
Chart 2: Pipe Capacity Table*( x 1,000 BTU's)
Pipe Length**
15'
30'
45'
60'
75'
90'
105'
120'
* Using 0.6 Specific Gravity Gas and a Pressure Drop of 0.3" of Water Column
0
** Each 90 elbow counts as 3' for the purpose of these calculations
Example 2:
There is 75 feet of 1" pipe from the meter to the burner and there are 5 elbows.
(5 elbows X 3') + 75' pipe = 15' + 75' = 90' of effective pipe length
The maximum BTU that can be fired is 141,000 BTU (see chart 2)
It is advisable to run a separate gas line from the meter to the gas burner to avoid pressure
drops. Refer to the above Pipe Capacity table for the correct sizes.
CONFORM TO LOCAL CODES.
cast iron parts ) with a suitable pipe dope that is resistant to liquefied petroleum gases. Test for
gas leaks using an approved gas leak tester.
Piping should consist of:
1. A shut off valve approximately 6' away from the unit.
2. A 1/8" plugged NPT tapping for gas pressure measurement preferably on the manual shut off
valve (as shown or anywhere between the gas valve and the shut off valve).
Note: The manual shut-off valve and tapping are NOT part of the SU-2A Gas Burner.
Please make sure you conform to local and state codes.
3. A gas union.
4. A drip pipe.
Caution: The gas valve should not be subjected to more than ½ PSIG. Therefore, the
burner should be isolated during high-pressure gas leak tests. The appliance and its
individual shut off valve must be disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of ½ psig. The appliance must be
isolated from the gas supply piping by closing its individual manual shut off valve during any
pressure testing of the gas supply piping system at test pressures equal to or less than ½ psig.
GAS SERVICE & PIPE CAPACITY
Nominal diameter of pipe in inches
¾" 1"
172 345
120 241
99 199
86 173
77 155
70 141
65 131
120
Use black steel pipe and malleable fittings ( do not use
1 ¼" 1 ½"
750
535 850
435 700
380 610
345 545
310 490
285 450
270 380
ALL PIPING MUST
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