Midco Economite RE4400DS - Manual (Page 6)

6
? When the burner is installed in the vestibule of jacketed equipment, it is recommended
that the Automatic Safety Shut-Off Valves 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. 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.
? After checking for leaks, purge the gas line up to the burner inlet. Purging the air from the
gas supply line at this step will expedite the first light-off.
NOTE: If there is more than 1.0" W.C. differential in the inlet pressure to the burner
compared to when all other gas utilization equipment are off, refer to Section VII.
____________________________
Part 1
Installation Continued
Part 1 Installation
Figure 6: Piping Diagram
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. Propane capacities
shown are for a total
pressure drop of 0.5”W.C.
For higher permissible
pressure drops, consult
your gas supplier.
Table 2: Schedule 40 NPT
Pipe-Capacity Chart
10
200
590
400
40
275
200
500
450
650
75
190
150
360
325
475
20
150
400
275
Pipe
Size
3/4
3/4
1
1
1 1/4
1 1/4
1 1/2
Natural
Propane
Natural
Propane
Natural
Propane
Natural
100
160
300
275
630
400
Approximate Capacity -MBH
Pipe Length
Type
of Gas
VI Piping
Continued