Midco Unipower V1, Installation And Service Instructions Manual, Page: 4 / 40

4
Midco International Inc.
8471 95
Part 1 Installation
CAUTION: The VA Burner must be protected from excessive moisture. Provide
adequate enclosure to protect from the weather.
- The burner mounting fl ange should be sealed to the combustion chamber by means of a ceramic
based high temperature gasket (supplied with the burner).
- Make sure the gasket
fi ts over the burner housing, fl ush against the mounting fl ange.
- Insert the burner into the rectangular hole until the mounting fl ange is tight to the exchanger front
plate.
- Tighten
fl ange. During the tightening process, the gasket will be compressed creating the seal that
is needed.
CAUTION: Flue gas leakage will cause equipment damage and may a ff ect the
operation of the equipment.
NOTE: During the initial startup of the burner, a small portion the new gasket may be oxidized and
some white smoke and burning odor will present. This is normal.
CAUTION: If the smoke persists and visible leakage of the fl ue gas is observed,
recheck the seal. This may require removing the burner from the heat equipment.
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The standard V Series burner valve train is pre-assembled and pre-wired, but it will need to be
installed to the burner. There are three parts that need to be connected: the main gas valve train, the
pilot gas supply line and the air pressure line. See Figure 3.
Following are the instructions for
assembling the valve train:
1. Connect the union on the main gas
valve train to the union on the burner
(Figure 3 - #1).
2. Connect the gas supply line to the
shut-o
ff valve next to the main regulator
(Figure 3 - #2).
3. Connect air pressure line from the
compression
fi tting on the burner housing
to the brass compression fi tting on the
ratio regulator (Figure 3 - #3).
4. Connect the Pilot Gas Supply Line
to the brass compression
fi tting that is on
pilot gas solenoid valve, which is mounted
on the burner control box, and the other
end to the tubing has to be connected to
the brass
fi tting at the 1/8 ″ Tee next to the
pilot regulator (Figure 3 - #4). (Note: On
some variations, the pilot gas solenoid
valve is not mounted on the control box.
In this case, refer to the assembly drawing
provided with the VA burner.)
5. Low
fi re bypass (Figure 3 - #5).
6. Supply gas pressure tap (Figure 3 - #6).
CAUTION: The available gas pressure should be within the limits shown in the
SPECIFICATIONS section, Table 1. Excessive pressure may damage safety shut-o ff
valves, regulators or manual valves.
Approximate Capacity -MBH
Pipe Type Pipe Length
Size of Gas 10 ′ 20 ′ 40 ′ 75 ′ 100 ′
1 ″ Propane 1075 730 500 360 300
1 ¼ ″ Natural 900 600 450 325 275
1 ¼ ″ Propane - - 1040 750 630
1 ½ ″ Natural 900 650 475 400 -
1 ½ ″ Propane - - - - 975
III Burner
Mounting
Instructions
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!
IV Piping
1
4
3
2
Pilot Gas
Supply Line
Air
Pressure
Line
Main Gas
Valve
Train
5
6
Figure 3 - Typical Valve Train Assembly, UL
!
Table 2: Schedule 40 NPT Pipe - Capacity Chart
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.
!