Modine Manufacturing POR oil-fired unit Installation Instructions Manual page 3

DESIGN FEATURES AND PERFORMANCE DATA
Superior Heat Exchanger Life Expectancy
Long life is due in part to the roll-formed design of the heat
exchanger. Stresses caused by thermal expansion and
contraction typically concentrate in areas of sharp angular
bends or adjacent to welds, all of which are minimized with
roll-forming to distribute thermal expansion stresses uniformly.
Made of corrosion-resistant, 14 gauge aluminized steel, the
heat exchanger contains a preformed, ceramic fiber fire pot
that is thermally efficient, lightweight, resilient, and resists
both mechanical and thermal shocks. It reaches operating
temperature quickly, contributing to the efficiency of operation.
Figure 3.1
Model POR Heat Exchanger Features
Flue Connection
Flue Collector
Heat Exchanger
Internal Baffles
(not shown)
Inspection Port
Service Door
Clean-out Ports
Ceramic Fiber Fire Pot
(not shown)
Performance Data
Input Input Output
Model Btu/Hr GPH Btu/Hr
POR100 119,000 0.85 100,000
POR145 175,000 1.25 145,000
POR185 231,000 1.65 185,000
*Deflector blades pitched 45° at the floor (heated air). Mounting height is measured from floor to bottom of unit.
Fan Motor Specifications
Model HP Voltage Hz
POR100 1/5 115 60
POR145 1/3 115 60
POR185 1/3 115 60
*Total AMPS equals fan motor AMPS plus burner motor and ignition transformer load of 2.2 AMPS.
CFM Delivery Temp.
@ 70°F FPM Rise °F Height* Throw
1890 460 49
2400 580 56
3200 740 54
Fan
Motor
Phase Amps* RPM Type
1 2.1 1100 PSC
1 5.4 1100 PSC
1 5.4 1100 PSC
4-112.3
Efficient Combustion
Combustion products heat flow through the heat exchanger can
be traced by the arrows in the cross-sectional view in Figure 3.2.
Flue products rise to the top of the drum, then pass into the two
radiators of the heat exchanger where internal baffles cause
them to flow to the bottom of the radiators; then back up to
the flue collector and out of the stack. During this passage the
original temperature at the fire pot of 2200-2300° F, is reduced
to a stack discharge temperature of 470 to 570° F. The units
are designed to operate at a stack draft of minus 0.02" W.C.
Easy Installation
All units are factory-assembled, wired, and fire tested prior
to shipment. Units are ready to connect to 115V/60Hz/1ph
supply voltage, a 24V thermostat, fuel lines, and vents. Units
are shipped for a single-unit two pipe oil supply system, but
can be simply modified for a single pipe oil supply system or a
multiple-unit installation supplied by a common fuel distribution
system. They can be suspended with four threaded rods (1/2"-
13NC tap) or with 3/4" pipe by use of an optional pipe hanger
kit accessory.
Reduced Maintenance, Easy to Service
Under average conditions Modine unit heaters typically
require inspection only once a year, more often if the air is
contaminated with fumes, dust, or spray.
The heat exchanger is equipped with a convenient inspection
port and the service door opening is ample in size to facilitate
the removal of the fire pot should replacement become
necessary. Two clean-out ports are also readily accessible for
periodic cleaning. Refer to Figure 3.1.
The motor is totally enclosed with permanently lubricated
bearings to minimize maintenance. The fan and limit control,
motors, and burner are externally mounted on the unit for easy
service access.
Application Suggestions
For recommendations on specifying, applications, and locating
unit heaters, refer to Modine Literature 75-203 "How to Specify
the Right Unit Heater".
Figure 3.2 - Combustion Products Heat Flow
Max Heat
12' 39'
13.5' 50'
12' 51'
Fan Dia.
18"
18"
22"
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