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Maximum Performance, Comfort, and Efficiency
Modine model POR oil-fired unit heaters offer an efficient and
reliable means of heating, particularly in regions where supplies
of other fuels, such as natural gas, may be unavailable,
undependable, or interruptible. The units are direct driven
propeller fan type units designed for overhead suspension and
horizontal delivery of heated air. They are available in three
model sizes: 100,000, 145,000, and 185,000 Btu/hr outputs.
Time-tested and field-proven components are engineered
into the design of these compact units which produce comfort
heating at the lowest cost through their highly efficient
operation. Models are UL-listed and require fuel oil grade No. 1
or 2, as specified by ASTM (American Society for Testing and
Materials) D396-73 Standard Specifications for Fuel Oils or
Canadian Government Specification Board, 3-GP-28.
The following are standard features and benefits of the model
POR unit (refer to Figure 2.1):
Advanced Burner and Burner Controls
The POR oil fired unit heater is equipped with the latest in
burner and burner control technology making the POR an
industry leader in efficient fuel handling. Features include:
• A pressure-atomizing, gun-type burner with a stainless steel,
die-stamped flame retention head that produces a highly
stable flame with 20-30% greater combustion efficiency over
non-flame retention type burners. The flame retention head
matches the flame to the shape of the heat exchanger for
maximum heat transfer while ensuring a long life.
• A two-stage fuel unit for maintaining maximum fuel pressure
delivery, even in high lift applications.
• The fuel unit utilizes an energy efficient permanent split
capacitor (PSC) motor with ball bearings for reduced energy
consumption, excellent starting characteristics, and reduced
maintenance.
• The latest in oil burner controls with a solid state
microprocessor based controller featuring:
> Interrupted-duty ignition that disables the spark ignition
once the flame has been proven. This feature extends the
life of the ignition system, reduces component noise, and
saves energy over traditional controls that maintain a power
consuming spark during the entire call for heat period.
> Limited recycle/limited reset feature to limit the accumulation
of unburned oil in the combustion area.
> Communications port to enable communication with service
instruments or data acquisition equipment.
> Diagnostic LED to provide service personnel an easy
indication of cad cell resistance and operational status
(lockout, recycle, etc.).
> 15 second valve-on delay provides a pre-purge mode that
allows for clean starts and reduced maintenance.
> A cad-cell safety system de-energizes the burner controls
if a flame is not produced in 30 seconds. Manual reset of
flame protection is required following this safety shut-down.
• Beckett electronic oil igniter module that provides superior
spark ignition (20kV peak) and a smaller and lighter package
than older spark transformer designs.
• Beckett CleanCut burner pump with the following advantages:
> Cleaner operation by use of a solenoid valve that cuts oil flow
almost instantly when power is cut to the motor, eliminating
coasting stops that can cause soot formation on shut-down.
> Pre-purge type controls work hand-in-hand with the
CleanCut pump to establish airflow and bring pump
pressure up to full operating levels before light-off to ensure
smooth and clean ignition.
> More reliable with fewer moving parts, compared to
conventional pumps and fewer troublesome oil fittings to
cause problems.
Durable Attractive Casing Design
The casing is treated for protection against corrosion and
painted with an attractive, Modine Gray-Green, baked polyester
powdercoat paint finish.
Quiet, Efficient, and Safe Air Mover
The propeller fan is statically balanced and the motor resiliently
mounted to the finger-proof fan guard to minimize vibration and
noise. Additionally, the draw-formed casing venturi at the air
inlet is designed to reduce fan noise and power consumption.
The motor is a totally enclosed, permanent split capacitor
(PSC) type that provides excellent starting capabilities with low
amp draw on operation.
A fan and limit-control safety device performs three functions:
1) delays start of fan until the heat exchanger has warmed up
and prevents fan from stopping until the heat exchanger has
cooled, 2) protects the unit from overheating, and, 3) provides a
manual switch for constant fan operation.
Effective Heat Throw
Heat throw and coverage are controlled by manual adjustment
of standard horizontal and/or optional vertical louver blades.
Depending on the model, the heat throw will vary from 39 to 51
feet, maximizing heated air distribution at floor level.
DESIGN FEATURES
4-112.3
Fan and Limit
Control
Oil Burner with
Microprocessor
Control
Horizontal
Louvers
Figure 2.1 - Model POR Unit Features
Heat Exchanger
Assembly
(See Figure 3.1)
Casing with
Durable Baked
Polyester
Powdercoat Paint
Flue Connection
Propeller Fan
with Finger-Proof
Fan Guard
Junction Box
Efficient PSC
Fan Motor