Midco Economite RE4400DS HTD - Manual (Page 4)

DANGER: Explosion hazard.
Do not use oxygen for pressure testing.
An explosion could occur during initial start up.
If the burner piping must be rearranged because of space limitation, be sure to carry out
the general arrangement shown in Figure 2. Install the combination valve in any position
except up-side down.
When the burner is installed in the vestibule of jacketed equipment, it is recommended
that the Automatic Safety Shut-Off Valve be left adjacent to the burner within the vestibule
and the Main Manual Shut-Off Valve be installed outside.
Run full size pipe or tubing from regulator vent openings to outside of building. Refer to
regulator manufactures’s installation instructions. Provide no traps in the vent lines and
terminate away from all doors and windows; also make provisions for keeping rain and
foreign objects from entering the vent piping.
When high supply gas pressure is encountered, as in the case in many industrial plants,
the gas line size can be reduced to allow for a greater pressure drop; however, the size must
be sufficient to deliver burner rating pressure.
CAUTION: High gas pressure supply lines require the proper pressure
reducing regulators. Install a high pressure regulator of the Tight Shut-Off type, sized
for main gas input, upstream of the low pressure regulators.
The high pressure regulators must be adjustable to 14" W.C. outlet pressure.
When the gas supply line is about to be put into service it must be tested to insure that it
is gas tight. Use air or inert gas under pressure and test with soap and water to locate leaks.
Before gas is turned onto the system, a check must be made to see that there are no open
fittings and to make sure the burner main valve is closed.
Part 1
Installation Continued
4
Part 1 Installation
III Piping
Continued
Natural Gas capacities
shown are for a total
pressure drop of 0.3"W.C.
For 0.5"W.C. pressure drop,
multiply capacity shown by
1.3. For higher permissible
pressure drops, consult
your gas supplier.
Table 2: Schedule 40 NPT Pipe-Capacity Chart
10
200
400
40
200
450
650
75
150
325
475
20
150
275
Pipe
Size
3/4
1
1 1/4
1 1/2
Natural
Natural
Natural
Natural
100
275
400
Approximate Capacity -MBH
Pipe Length
Type
of Gas
Figure 2: Typical Piping Diagram