Midco EC200 & EC300 - Manual (Page 6)

6
Midco International Inc.
8471 38
VII Main Gas Spud
CAUTION: The available gas pressure should be within the limits shown in the
SPECIFICATIONS section. Excessive pressure will damage the Combination Gas Valve and
Regulator. If the supply pressure exceeds the 14.0″ W.C. maximum, a suitable intermediate
main regulator must be installed ahead of the Main Manual Shut-Off Valve shown in Figure 6.
Pipe Type Approximate Capacity -MBH
Size of Gas Pipe Length
10 20 40 75 100
3/4 Natural 200 150
3/4 Propane 590 400 275 190 160
1 Natural 400 275 200 150
1 Propane 1075 730 500 360 300
1 1/4 Natural 900 600 450 325 275
1 1/4 Propane 1040 750 630
1 1/2 Natural 900 650 475 400
1 1/2 Propane 975
- The burner gas supply piping should branch
off from the main line as close to the gas meter as possible. Do not connect to the bottom of a
horizontal section. Use new black pipe and malleable fi ttings free of burrs.
-
Provide a sediment trap, union and 1/8″ pressure tap in piping close to burner as shown in
Figure 6.
-
Use pipe joint compound approved for use with natural and liquid petroleum gases.
- Piping must comply with local codes.
- To obtain the maximum fi ring rate of the burner, the fuel gas supply piping must be sized to
provide a minimum of 6″ W.C. pressure to the inlet of the combination valve when the burner and all
other gas appliances are on.
-
When pressure testing the supply piping, the burner valve train must be protected.
CAUTION: If the test pressure is 0.5 PSIG or less, closing the Main Manual Shut-Off
Valve will suffi ce.
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 limitations, be sure to carry out
the general arrangement shown in Figure 6. The Combination Gas Valve will operate and can be
installed in any position except up-side down.
-
When the burner is installed in jacketed equipment, it is recommended that the Combination
Gas Valve be left adjacent to the burner within the vestibule. The Main Manual Shut-Off Valve can
be installed outside of the jacketed equipment.
___________________________
The EC200 and EC300 burners are approved for use with NATURAL or PROPANE gas only, and
should be used only with the gas specifi ed on rating plate.
-
A Standard Model EC Series Economite is shipped ready for NATURAL gas and is fi eld
convertible to PROPANE gas, see Table 3.
-
As shipped, the EC200 has no spud installed, manifold pressure set at 4.1″ W.C., air restrictors
off and the air shutter full open. As shipped the EC 300 has no spud installed, manifold pressure set
at 4.0″ W.C., air restrictors off and the air shutter full open. OEM applications will be set based on
the equipment requirements.
-
If the required fi ring rate does not fall within the range of the installed orifi ce, or if converting
to PROPANE gas, use Table 3 to select the spud with the correct orifi ce size (stamped in inch
diameter) for the desired capacity from the spare orifi ce bag assembly.
-
To change the orifi ce, turn off the Main Manual Shut-Off Valve and the main electric to the
burner Refer to piping diagram, Figure 6, to locate the orifi ce location if required.
Part 1 Installation
VI - Piping
EC 200 / 300
INSTALLER PROVIDED
SEDIMENT TRAP
INSTALLER PROVIDED UNION
INSTALLER PROVIDED
1/8" NPT PRESSURE TAP
IN SUPPLY PIPING
INSTALLER PROVIDED
SHUT OFF VALVE
REMOVE PLUG -
ORIFICE IS
LOCATED INSIDE
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
Figure 6: Piping Connections