5
Midco International Inc.
8471 95
Part 1 Installation
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The burner gas supply piping should branch o
ff
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 cutting and threading burrs or defects.
-
Use pipe joint compound approved for use with natural and propane gases.
-
Piping must also comply with your local codes.
-
When high supply gas pressure is encountered, as is 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
su
ffi
cient 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-O
ff
type upstream
of the low pressure regulator sized for main gas input. .
CAUTION: Because it is di
ffi
cult to accurately control pressure during supply pipe
leak testing, it is recommended that all low pressure components, both main and
pilot, be only exposed to 14.0
″
W.C. maximum. Exposing low pressure regulators
and valves, including manual valves, to pressures over 1/2 PSIG (14.0
″
W.C.) will
cause damage and void all warranties.
-
To obtain the maximum
fi
ring rate of the burner, the gas supply piping must be sized to provide
a minimum of 10.0
″
W.C. pressure to the inlet of the upstream automatic safety shut-o
ff
valve when
the burner and all other gas utilization equipment are on.
-
If the burner piping must be rearranged because of space limitations, be sure to carry out the
general arrangement shown in Figure 9 on page 29. Refer to valve and regulator manufacturer
speci
fi
cations for acceptable mounting orientations.
-
When the burner is installed in the vestibule of jacketed equipment, it is recommended that the
Automatic Safety Shut-O
ff
Valves be left adjacent to the burner within the vestibule and the Main
Manual Shut-O
ff
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 the gas supply line is about to be put into service it must be tested to ensure that it is gas
tight. Use air or inert gas under pressure and test with soap and water to locate leaks.
DANGER: Explosion hazard.
Do not use oxygen for pressure testing.
An explosion could occur during initial start up.
-
Before gas is turned on to the system, a check must be made to see that there are no open
fi
ttings and to make sure the burner main and pilot manual valves are 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
fi
rst light-o
ff
.
WARNING: Explosion Hazard. Improper installation can cause fuel buildup and an
explosion.
__________________________________________
CAUTION: Refer to wiring diagram located on the inside of the burner housing cover.
Before proceeding verify burner model number for correct wiring diagram. Refer to
Figures 4A / 4B / 4C / 4D for 120V models and 4E for 24V models.
-
Installation wiring and grounding to the burner must conform to local codes, or in their absence
in the United States to National Electric Code ANSI/NFPA No. 70 latest edition and in Canada to
Canadian Electrical Code Part 1 CSA Standard C22.1.
-
Use copper wire not less than 16 gage for line voltage wiring. Hook up to a dedicated line with
an on-o
ff
disconnect switch and correctly size circuit breaker for the 120V models and a 10 Amp
breaker for 24V models. Refer to Table 1 for correct amp draw requirement.
-
The frame of the burner should be well grounded. Normally the piping and/or electric conduit
will provide su
ffi
cient grounding. However, a ground lug is located in control box for positive
grounding where insulated pipe couplings are used or where any doubt exists regarding grounding
su
ffi
ciency.
IV Piping
Continued
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V Electrical
A - Safety