Unitary products group P-HMX12F05701, P-HMX12F08001, P-HMX14F10001, P-HMX20F12001 Installation Instruction
INSTALLATION
INSTRUCTION
CONTENTS
INTRODUCTION....................................... 3
HEATLOSS .......................................... 3
LOCATIONOFUNIT.................................... 3
UPFLOWINSTALLATION................................ 4
HORIZONTALINSTALLATION............................ 4
NON-SUSPENDEDINSTALLATION ....................... 5
SUSPENDEDINSTALLATION............................ 5
AIRCONDITIONINGAPPLICATIONS...................... 5
COMBUSTIONAIR..................................... 5
CHIMNEYVENTING.................................... 5
BAROMETRICDAMPERCONTROL....................... 7
FURNACE CONTROLS ................................. 7
ELECTRICALCONNECTIONS............................8
HUMIDIFIER.......................................... 8
OILTANK ............................................ 8
PIPINGINSTALLATION................................. 9
OILFILTER........................................... 9
OILBURNERNOZZLES................................. 9
COMBUSTIONCHAMBER.............................. 10
BURNER ELECTRODES ............................... 10
OILBURNERSETUP.................................. 10
PREPARATIONS:..................................... 10
PROCEDURE:........................................ 11
STACKTEMPERATURE:............................... 11
CIRCULATING AIR BLOWE R ............................ 12
MAINTENANCEANDSERVICE.......................... 13
FURNACE INSTALLATION SET UP. ...................... 13
OPERATING INSTRUCTIONS ........................... 14
WIRINGNOTES...................................... 18
CONTINUOUSFANOPERATION: ........................18
ACCESSORIES:...................................... 18
THERMOSTAT HEATING
CONNECTIONS:...................................... 18
R7184 DETAILED SEQUENCE OF OPERATION .............20
R7184 LED DIAGNOSTIC LIGHT. . . ...................... 22
TROUBLESHOOTING ................................. 22
OIL FIRED WARM AIR FURNACE
P-HMX12F05701 - P-HMX12F08001
(Horizontal or Upflow Model)
P-HMX14F10001 - P-HMX20F12001
(Upflow Only)
Read this complete manual before beginning installation. These
instructions must be kept with the furnace for future reference.
CAUTION: READ ALL SAFETY GUIDES BEFORE
YOU BEGIN TO INSTALL YOUR UNIT.
035-17473-000-B-1101
WARNING
035-17473-000-B-1101)
INTRODUCTION
Please read these instructions completely and carefully
before installing and operating the furnace.
IMPROPER INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE PRODUCT COULD CAUSE PERSONAL INJURYOR
PROPERTY DAMAGE.
IMPROPER INSTALLATION, ADJUSTMENT,
ALTERA TION,SERVICE OR MAINTENANCE CAN
CAUSEINJURYORPROPERTYDAMAGE. REFER
TO THIS MANUAL FOR ASSISTANCE OR ADDITIONAL INFORMATION, CONSULTA QUALIFIED
INSTALLER, SERVICE AGENCY OR THE GAS
SUPPLIER.
CAUTION
THIS PRODUCT MUST BE INSTALLED IN STRICT
COMPLIANCE WITH THE ENCLOSED INSTALLATION INSTRUCTIONS AND ANY APPLICABLE
LOCAL, STATE, AND NATIONAL CODES INCLUDING BUT NOT LIMITED TO,BUILDING, ELECTRICAL AND MECHANICAL CODES.
The furnace must be installed and set up by a qualified
contractor.
P*HMX12F05701 and P*HMX12F08001 are oil fired
forced air multi-positional furnaces, with an output
capacity range of 58,000 BTU/Hr to 79,000 BTU/HR.
These furnaces may be installed in the up-flow position, as well as both horizontal left and right positions.
P*HMX14F10001 and P*HMX20F12001 are oil fired
Upflow ONLY furnaces, with an output capacity range
of 100,000 BTU/Hr. to 118,000 BTU/Hr.These furnaces
shall be installed in the up-flow position only.
All model furnaces are listed with the Canadian Stan-
dards Association,(CSA) and comply with both
Canadian and American (U.S.) standards for use with
No. 1 (Stove) and No. 2 (Furnace) Oil. Please refer to
the tables in the appendix for performance and dimensional data.
WARNING
WARNING
Thefurnace area mustnot beused asa broomcloset
orforanyotherstoragepurposes,as afirehazardbay
be created. Never s tore items such as the following
on, nearor in contact with the furnace.
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds; plastic items or containers; gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids
or other volatile fluid.
3. Paint thinners and other painting compounds.
4. Paper bags, boxes or other paper products
Never operate the furnace with the blower door
removed. To do so could result in serious personal
injury and/or equipment damage.
DO NOT USE GASOLINE, CRANK CASE OIL, OR
ANY OIL CONTAINING GASOLINE.
In Canada, the installation of the furnace and related
equipment shall be installed in accordance with the
regulations of CAN/CSA - B139, Installation Code
For Oil Burning Equipment, as well as in accordance
with local codes.
In the United States of America, the installation of the
furnace and related equipment shall be installed in
accordance with the regulations of NFPA No. 31,
Installation of Oil Burning Equipment
,aswellasin
accordance with local codes.
When installation or application questions arise, regu-
lations prescribed in the National Codes and Local
Regulations take precedence over the general instructions provided with this installation manual. When in
doubt, please consult your local authorities.
All models are shipped assembled and pre-wired. The
furnace should be carefully inspected for damage
when being unpacked.
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HEAT LOSS
The maximum hourly heat loss for each heated space
shall be calculated in accordance with the procedures
described in the manuals of the Heating, Refrigera-
tion and Air Conditioning Institute of Canada
(HRAI), or by any other method which is suitable for
local conditions, provided the results obtained are in
substantial agreement with, and not less than those
obtained using the procedure described in their manuals.
In the United States, Manual J.
titled, "Load Calcula-
tion" published by the Air Conditioning Contractors
of Amer ica, describes a suitable procedure for calcu-
lating the maximum hourly heat loss.
LOCATION OF UNIT
The furnace should be located such that the flue connection to the chimney is short, direct and consists of
as few elbows as possible. When possible, the unit
should be centralized with respect to the supply and
return air duct work. A central location minimizes the
trunk duct sizing. All models may be installed on combustible floors.
Minimum installation clearances are listed in Table 1.
035-17473-000-B-1101
Table 1: Clearance to Combustibles
Models: P*HMX12F05701 and P*HMX12F08001
Location Up-flow Horizontal
Top 2 in. 2 in.
Bottom 0 in. 1 in.
S/A Plenum 1 in. 1 in.
Rear 1 in. 1 in.
Sides 1 in. 1 in.
Front
Flue Pipe 9 in. 9 in.
Enclosure Closet Alcove
1
24” clearance is required for servicing.
Models: P*HMX14F10001 and P*HMX20F12001
Location Up-flow
Top 1 in.
Bottom 0 in.
S/A Plenum 1 in.
Rear 1 in.
Sides 1 in.
Front
Flue Pipe 4in. measured horizontally or below flue pipe.
Flue Pipe 9 in. measured vertically or above flue pipe.
Enclosure Closet
1
24” clearance is required for servicing.
9in.
9in.
1
1
NOTE: The recommended installation clearances do not take
intoconsiderationtheclearances necessary to replace
the air filter or perform otherroutine maintenance.
9in.
1
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035-17473-000-B-1101
Table 2: General Specifications
MODEL INPUT OUTPUT NOZZLE BECKETT AF BURNER AIR
P*HMX U.S. GPH BTU/Hr. Delavan BURNER MODEL BURNER HEAD FILTER
P*HMX12F05701 0.50 58,000 0.50 / 70°A AF76BO F0 16 x 25 x 1
P*HMX12F08001 0.70 79,000 0.70 / 70°A AF76BO F0 16 x 25 x 1
P*HMX14F10001 0.85 100,000 0.85 / 70°A AF76XN F3 16 x 25 x 1
P*HMX20F12001 1.00 118,000 1.00 / 70° A AF76XN F3 16 x 25 x 1
NOTE: Over-fire draft for all models is -0.02 in Water column. Static Plate Diameter: 3-3/8 inch for AF76BO and 2-
3/4 inc. for AF76XN.
UPFLOW INSTALLATION
These furnace models have been assembled for installation in the up-flow position. Maintain all clearances to
combustibles as outlined in Table 1 on page 3.
Suggestion; as a measure to prevent fuel oil from accumulating in locations other than the combustion chamber, as could be the case in the event of nozzle drip,
install the furnace with an approximate 2 degree slope
from the oil burner casing towards the combustion
chamber. Use shims made of noncombustible material.
HORIZONTAL INSTALLATION
The 057 & 080 BTU output model furnaces are assembled and shipped ready for installation in the upflow
position. The furnace may be installed in either of the
horizontal positions; warm air discharging left or warm
air discharging right by following these steps:
1. Rotate the furnace 90° to the desired position.
2. Remove the three nut and washer sets fastening the oil
burner assembly to the furnace. Rotate the oil burner
assembly to be in the upright position. (Ignition transformer and / or oil primary control control should be on
top).
3. Re-align the oil burner assembly to the combustion
chamber (fire-pot), then secure into place with the three
nut and washer sets.
FIGURE 1 : TYPICAL SUSPENDED OPERATION
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035-17473-000-B-1101
NON-SUSPENDED INSTALLATION
Maintain clearances to combustibles as outlined in
Table 1. Installation on a combustible floor requires a
clearance of 1 inch. This can be done by using noncombustible materials such as one inch thick channel
iron or similar material. The furnace must be supported
in such a way as to not allow twisting or sagging of the
cabinet. Suggestion; as a measure to prevent fuel oil
from accumulating in locations other than the fire pot,
as could be the case in the event of nozzle drip, install
the furnace with an approximate 2 degree slope from
the oil burner casing towards the fire pot. Use shims
made of noncombustible material.
SUSPENDED INSTALLATION
Refer to Figure 1. Maintain clearances to combustibles
as outlined in Table 1. Remove the four circular knockouts on the top panel, and similarly, the four circular
knock-outs on the bottom panel. The removed knockouts allow 3/8 inch treaded road to be inserted through
the interior of the furnace. Use care when inserting
rods, since the foil backed insulation can be easily
ripped and torn away from the panel surfaces. Secure
the furnace with 2 inch minimum slotted angle or equivalent, as shown in Figure 4. The furnace must be supported in such a way as to not allow twisting or sagging
of the cabinet. Suggestion; as a measure to prevent
fuel oil from accumulating in locations other than the
fire pot, as could be the case in the event of nozzle
drip, install the furnace with an approximate 2 degree
slope from the oil burner casing towards the fire pot.
COMBUSTION AIR
If the furnace is installed in a closet or utility room, two
ventilation openings must be provided connecting to a
well ventilated space (full basement, living room or
other room opening thereto, but not a bedroom or bathroom). One opening shall be located 6” from the top
and bottom of the enclosure at the front of the furnace.
Each opening shall have a minimum free area of 1½
square inches per 1,000 Btu/h of total input rating of all
appliances installed in the room.
For furnaces located in buildings of unusually tight construction, such as those with high quality weather stripping, caulking, windows and doors, or storm sashed
windows, or where basement windows are well sealed,
a permanent opening communicating with a well ventilated attic or with the outdoors shall be provided, using
a duct if necessary. The duct opening shall have a free
area of 1½ square inches per 1,000 Btu/h of total input
rating of all appliances to be installed. When a furnace
is installed in a full basement, infiltration is normally
adequate to provide air for combustion and draft operation. Furnace rooms under 65m³ (700 ft³) should automatically be treated as confined space.
The Model CAS-2B-90E Furnace Boot manufactured
byFieldControls,Inc.maybeusedwiththefurnaceto
obtain combustion air directly from outdoors. Use of
this device does not alter the need for ventilation air;
however, it does provide a good direct source of combustion air and is connected directly to the oil burner.
CHIMNEY VENTING
AIR CONDITIONING APPLICATIONS
If the furnace is used in conjunction with air conditioning, the furnace shall be installed in parallel with or with
the evaporator coil upstream from the furnace to avoid
condensation in the heat exchanger. In a parallel installation, the dampers or air controlling means must prevent chilled air from entering the furnace. If the
dampers are manually operated, there must be a
means of control to prevent the operation of either system unless the dampers are in the full heat or full cool
position. The air heated by the furnace shall not pass
through a refrigeration unit unless the unit is specifically approved for such service.
The blower speed must be checked and adjusted to
compensate for the pressure drop caused by the evaporator coil. Refer to Appendix B for recommended wiring and electrical connections of the air conditioning
controls.
Unitary Products Group 5
The chimney must be sized correctly and be in good
repair.If the chimney is oversized, there is a high risk of
the flue gases condensing resulting in damage to the
chimney and other venting parts. This problem may be
corrected by the use of an appropriately sized chimney
liner.
If the chimney serves the furnace only, the vent should
be sized at 4 inch minimum, 5 inch maximum. If the furnace is to be co-vented with other appliances, refer to
CAN/CSA B139, Installation Code For Oil Burning
Equipment or NFPA 2 11, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances for
correct sizing information.
035-17473-000-B-1101
Table 3: Min. Chimney Base Temperatures (°F)
Model Chimney Height (ft.)
P-HMX12F05701 300 400 535 725
P-HMX12F08001 270 330 405 505
P-HMX14F10001 250 300 355 430
P-HMX12F12001 225 300 365 430
P-HMX12F5701 185 200 220 250
P-HMX12F08001 175 185 195 215
P-HMX14F10001 165 185 195 205
P-HMX12F12001 165 185 195 205
Chimneys with Thermal Resistance less than R6
Chimneys with Thermal Resistance greater than R6
IMPORTANT: The chimney must be capable of providing sufficient draft at all times for the safe removal of
the products of combustion.
Table 4: Common Chimney Problems
Key Trouble Diagnostic Remedy
A Top of chimney lower
than surrounding
objects
B Chimney Cap or ven-
C Coping restricts
Key Trouble Diagnostic Remedy
D Obstruction in chim-
E Joist protruding into
F Break in chimney lin-
G Collection of soot at
H Offset Lower light on exten-
I Two or more open-
J Loose-seatedpipein
K Smoke pipe extends
L Failure to extend the
M Loose-fitted clean-
tilator.
opening.
ney
chimney.
ing.
narrow space in flue
opening.
ings to the same
chimney.
flue opening.
into chimney.
length of flue parti-
tion to the floor.
out door.
11 20 28 36
Observation Extend chimney
Observation Remove
Observation Make opening as
Can be found bylight
and mirror reflecting
conditions in chim-
ney.
Lowering a light on
an extension cord.
Smoke test - build
smudge fire blocking
off other opening,
watching for smoke
to escape.
Lower light on exten-
sion cord.
sion cord.
Found by inspection
from basement.
Smoke test. Leaks should be
Measurement of pipe
from within or obser-
vation of pipe by
means of a lowered
light.
By inspection or
smoke test.
Smoke test. Close all leaks with
above all surround-
ing objects within 30
feet.
large as inside of
chimney.
Useweighttobreak
and dislodge.
Must be handled by
competent masonry
contractor.
Must be handled by
competent masonry
contractor.
Clean out with
weighted brush or
bag of loose gravel
on end of line.
Change to straight or
to long offset.
The least important
opening must be
closed, using some
other chimney flue.
eliminated by
cementing all pipe
openings.
Length of pipe must
be reduced to allow
endofpipetobe
flush with inside of
tile.
Extend partition to
floor level.
cement.
FIGURE 2 : COMMON CHIMNEY PROBLEMS
The chimney should be tested under “winter” conditions; doors and windows closed, all other fossil fuel
burning appliances on, clothes dryer on, bathroom fans
on, etc. If the chimney cannot overcome the competition for air, it will be necessary to access the reason for
it, and take corrective action. If the chimney is found to
be sized correctly and in good repair, it will probably be
necessary to re-evaluate the availability of combustion
and ventilation air, and take corrective action.
NOTE: These furnaces are approved for use with LVent.
NOTE: Maximum Temperature for L-Vent is
575° F(300
°C).
The flue pipe should be as short as possible with horizontal pipes sloping upward toward the chimney at a
rate of one quarter inch per foot. The flue pipe should
not be smaller in cross section area than the flue collar
on the furnace. The flue pipe should connect to the
chimney such that the flue pipe extends into, and terminates flush with the inside surface of the chimney liner.
Seal the joint between the pipe and the lining. The
chimney outlet should be at least two feet above the
highest point of a peaked roof. All unused chimney
openings should be closed. Chimneys must conform to
local, provincial or state codes, or in the absence of
local regulations, to the requirements of the National
Building Code.
See Figure 2 and Table 4 for common chimney problems and their remedies.
6 UnitaryProductsGroup
CAUTION
Thefurnacemustbeconnectedtoafluehavingsufficientdraftat alltimes to ensuresafe andproper operation of the appliance.
The flue pipe must not be routed through concealed
space, because it must be visually checked for signs of
deterioration during the annual inspection and servicing. The flue pipe must not pass through any floor or
ceiling, but may pass through a wall where suitable fire
protection provisions have been installed. Refer to the
latest edition of CAN/CSA B-139 for rules governing
the installation of oil burning equipment. In the United
States, refer to the latest edition of NFPA 31 for regulations governing the installation of oil burning equipment.
035-17473-000-B-1101
FIGURE 3 : R7184 OIL PRIMARY CONTROL
BAROMETRIC DAMPER CONTROL
This device is used in conjunction with conventional
chimney venting. This control (or draft regulator) automatically maintains a constant negative pressure in the
furnace to obtain maximum efficiency. It ensures that
proper pressures are not exceeded. If the chimney
does not develop sufficient draft, the draft control cannot function properly. The draft regulator, must be
installed within the same room or enclosure as the furnace, and should not interfere with the combustion air
supplied to the burner. The control should be located a
minimum of 3 flue pipe diameters (18”) from the furnace breaching and installed in accordance to the
instructions supplied with the regulator. The flue outlet
pressure (measured between the furnace and draft
regulator) should be set to - 0.02 in. w.c.
FURNACE CONTROLS
The furnace is controlled by the ST9103 ELECTRONIC
FAN TIMER (EFT) combined with an R7184 Oil Primary Control.
These controls provide for add-on air conditioning. The
ST9103 EFT is located in a control box mounted to the
blower support rails. The R7184 primary control
mounts to a 4x4 junction box connected to the oil
burner, contains the safety circuits and provides input
voltage for the separately mounted ignition transformer
on top of the oil burner.
FIGURE 4 : ST9103 EFT
The circulating fan is controlled by the ST9103 EFT.
The heat delay-on time is fixed at 30 seconds. This
provides a delay between the start of the burner and
the start of the circulating fan to reduce the amount of
ambient unheated air flowing through the ductwork.
The end of the circulating fan cycle is also delayed to
remove residual heat from the furnace. There are four
delay-off choices, 60, 90, 120 and 150 seconds, which
are field adjustable by manipulating the DIP switches
on the ST9103 EFT Board.
The cooling delay-on and delay-off times are fixed at
30 seconds each.
The furnace is protected against over-heating by fixed
high temperature limits. These controls are factory set
and are not field adjustable. If an over temperature
condition is detected, one or both limit switches will
interrupt power to the oil primary control, which will shut
off the oil burner. The circulating fan will continue to
operate. The high limit switches will automatically reset
when the furnace returns to a safe temperature.
Unitary Products Group 7
035-17473-000-B-1101
ELECTRICAL CONNECTIONS
The furnace is listed by the Canadian Standards
Association (CSA). It is factory wired and requires
minimal field wiring. In Canada, all field wiring should
conform to CAN/CSA C22.1 Canadian Electrical
Code, Part 1, and by local codes, where they prevail.
In the United States, the wiring must be in accordance
with the National Fire Protection Association NFPA-
70, National Electrical Code, and with local codes
and regulations.
Thefurnaceshouldbewiredtoaseparateanddedicated circuit in the main electrical panel; however,
accessory equipment such as electronic air cleaners
and humidifiers may be included on the furnace circuit.
Although a suitably located circuit breaker can be used
as a service switch, a separate service switch is advisable. The service switch is necessary if reaching the
circuit breaker involves becoming close to the furnace,
or if the furnace is located between the circuit breaker
and the means of entry to the furnace room. The furnace switch (service switch) should be clearly marked,
installedinaneasilyaccessibleareabetweenthefurnace and furnace room entry , and be located in such a
manner to reduce the likelihood that it would be mistaken as a light switch or similar device.
The power requirement for the P-HMX Series model is:
120 VAC, 1 ∅,60Hz.,12A.
Accessories requiring 120 VAC power sources such as
electronic air cleaners and humidifier transformers may
be powered from the ST9103 EFT. Do not use the
direct drive motor connections as a power source,
since there is a high risk of damaging the accessories
by exposure to high voltage from the auto-generating
windings of the direct drive motor.
Thermostat wiring connections and air conditioning
contactor low voltage connections are shown in the wiring diagram. Some micro-electronic thermostats
require additional controls and wiring. Refer to the thermostat manufacturer's instructions.
The thermostat should be located approximately 5 feet
above the floor, on an inside wall where there is good
natural air circulation, and where the thermostat will be
exposed to average room temperatures. Avoid locations where the thermostat will be exposed to cold
drafts, heat from nearby lamps and appliances, exposure to sunlight, heat from inside wall stacks, etc.
For thermostats with heat anticipators, the heat anticipator should be adjusted to the amperage draw of the
heating control circuit as measured between the "R"
and "W" terminals of the thermostat. To reduce the risk
of damaging the heat anticipator, do not measure cir-
cuit without first removing one of the two wires. To
determine the heating circuit amperage draw:
1. Note and disconnectthe wires from the “R” and “W” thermostat terminals.
2. Connect an ammeter between the two disconnected
wires from the thermostat.
3. Note the amperage reading.
4. Re-connect the thermostat wires. If the thermostat is
serving a combination heating and air conditioning system, pay particular attention to polarity.
5. When the thermostat is reconnected and re-plumbed,
adjust the heat anticipator setting to match the observed
amperage reading.
HUMIDIFIER
A humidifier is an optional accessory available through
most heating supplies outlets. Installation should be
carried out in accordance with the humidifier manufacturer's installation instructions. Water or water droplets
from the humidifier should not be allowed to come into
contact with the furnace heat exchanger. Terminals
(115 v) are provided on the ST9103 EFT control. Do
not use direct drive motor connections as a source of
power for 120 VAC humidifiers and humidifier transformers.
OIL TANK
Oil storage tanks must be selected and installed in
compliance with applicable codes; in Canada, CAN/
CSA-B139, Installation Code for Oil Burning Equip-
ment, Section 6 and in the United States, NFPA 31,
Standard for the Installation of Oil Burning Equipment
Chapter 2. Observe all local codes and by-laws.
In general, the oil tank must be properly supported and
remain stable in both empty and full condition. The oil
tank must be fitted with vent and supply pipes to the
outdoors. Refer to the above mentioned codes for sizing. The vent pipe must be no less than 1¼ inches
I.P.S., and terminate with an appropriate vent cap in a
location where it will not be blocked. The fill pipe must
be no less than 2 inches I.P.S., and terminate with an
appropriate cap in a location where debris will not enter
the fill pipe during oil delivery.
If located indoors, the tank should normally be in the
lowest level, (cellar, basement, etc.). It must be
equipped with a shut-off valve at the tank outlet used
for the oil supply. The oil tank must be located as to not
block the furnace / room exit pathway. Observe all
clearances specified in the above mentioned codes.
,
8 UnitaryProductsGroup
035-17473-000-B-1101
PIPING INSTALLATION
In Canada, the entire fuel system should be installed in
accordance with the requirements of CAN/CSA B-139,
and local regulations. Use only approved fuel oil tanks
piping, fittings and oil filters.
In the United States the installation must be in accordance with the requirements of NFPA No. 31 and local
codes and regulations.
Ensure that all fittings used in a copper oil line system
are high quality flare fittings. Do not use compression
fittings.
Pressurized or gravity feed installations must not
exceed 3 PSIG. A pressure greater than 10 PSIG may
cause damage to the shaft seal. If the height of the oil
stored in a tank above the oil burner exceeds 11-1/2
feet, it may be necessary to use a pressure-regulating
device approved for this purpose.
The P*HMX series furnace may be installed with a one
pipe system with gravity feed or lift. The maximum
allowableliftonasinglelinesystemis8feet.Lift
should be measured from the bottom (outlet) of the
tank, to the inlet of the burner. Sizing a single line system is complex because of the difficulty estimating the
pressure drop through each fitting, bend and component in the line. In general, keep single line systems
short as possible. If the furnace is to be installed in a
suspended position, a two pipe system may be the better alternative. Two-stage oil pumps are not available
for oil burners featuring the Beckett Clean Cut Fuel
Unit. Table 5
tal + vertical) for single and two stage oil pumps. All distances are in feet.
In retrofit applications,where an existing oil line system
is in place, a vacuum check will help determine
whether a 2-stage oil pump is necessary. The vacuum
in a system featuring a single stage oil pump should
not exceed 6” Hg. The vacuum in a system featuring a
2-stage oil pump should not exceed 15” Hg. (inches of
mercury.
shows the allowable line lengths (horizon-
Table 5: Oil Lines
Copper Tubing Oil Line Lengths
Single Stage 2-Stage
Lift
(feet)
0 53 100 68 100
1 49 100 65 100
2 45 100 63 100
3 41 100 60 100
4 37 100 58 100
5 33 100 55 100
6 29 100 53 100
7 25 99 5 0 100
8 21 83 4 8 100
9 17 68 4 5 100
10 13 52 42 100
12 - - - - - - 37 100
14 - - - - - - 32 100
16 - - - - - - 27 100
18 - - - - - - 22 88
3/8”O.D.
Tubing
1/2”O.D.
Tubing
3/8”O.D.
Tubing
1/2”O.D.
Tubing
For additional information, see the installation information sheet affixed to the oil burner).
OIL FILTER
All fuel systems should include an oil filter between the
fuel oil storage tank and the oil burner. For best results,
install the oil filter as close to the burner as possible.
When using an indoor oil tank, the oil filter may be
installed at the tank downstream from the shut-off
valve. If firing the furnace under the 0.65 gph rate, a 7
to 10 micron line filter should be installed as close to
the oil burner as possible.
OIL BURNER NOZZLES
The P-HMX Series furnace is certified for multiple firing
rates, ranging from 58,000 to 120,000 BTU/Hr. By
manipulating the oil burner nozzle, flame retention
head, and temperature rise, the furnace may be fired at
an ideal rate for a wide range of structures.
Table 6: Nozzles
MODEL
P*HMX12F05701 0.50 / 70° A 0.50 / 80° A F0
P*HMX12F08001 0.70 / 70° A ) 0.70 / 80° A ) F0
P*HMX14F10001 0.80 / 70° A 0.80 / 80° A F3
P*HMX20F12001 1.00 / 70° A) 1.00 / 80° A) F3
NOZZLE (Delavan)
STD ALT HEAD
Unitary Products Group 9
035-17473-000-B-1101
COMBUSTION CHAMBER
This furnace is equipped with an efficient cerafelt combustion chamber. It is held in place by a retaining
bracket.
WARNING
CHECK THE ALIGNMENT OF THE COMBUSTION
CHAMBERAND OILBURNER BEFORE FIRING. ITIS
POSSIBLE FOR THE COMBUSTION CHAMBER TO
SHIFTIS SUBJECTED TOROUGH HANDLINGDURING TRANSIT.
The cerafelt combustion chamber is quite soft initially.
After firing, it becomes very brittle. Be sure to do all
alignment and positioning adjustments before the first
firing.
The combustion chamber should be inspected for damage or carbon build-up whenever the oil burner is
removed for repairs or routine maintenance.
of air causes "soft" and "sooty" flames, resulting in soot
build-up throughout the heat exchanger passages.
Excess combustion air causes a bright roaring fire and
high stack temperatures resulting in poor fuel efficiency.
PREPARATIONS:
Drill a ¼” test port in the venting, ideally at least 2 diameters (12”) away from the furnace breaching, if venting
horizontally from the furnace, or from the flue pipe
elbow if venting vertically before reaching the furnace.
(see Figures 6 and 7).
CAUTION
Before operating the furnacecheck burneralignment
with combustion chamber. The end cone of the air
tubemustbecenteredtotheaccommodatingringprovidedin thedesign of thecombustionchamber.Adjust
as necesssary before
BURNER ELECTRODES
Correct positioning of the electrode tips with respect to
each other, to the fuel oil nozzle, and to the rest of the
burners is essential for smooth light ups and proper
operation.
The electrode tips should be adjusted to a gap of 5/32”,
1/16” ahead of the nozzle, 7/16” above the centerline of
the nozzle. The “Z” dimension (front edge of the burner
head to the front face) of the nozzle is 1-1/8 inches.
The electrode porcelains should be free of cracks, the
electrode tips should be tapered and free of burrs, and
the contact rods must be clean and be in firm contact
with the ignition transformer contact springs. The electrodes must not come into contact with the burner
head.
OIL BURNER SET UP
The burner air supply is adjusted to maintain the fuel to
air ratio to obtain ideal combustion conditions. A lack
first firing.
FIGURE 5 : TEST PORT LOCATION FOR SMOKE
TEST VERTICAL
FIGURE 6 : TEST PORT LOCATION FOR SMOKE
TEST HORIZONTAL.
Note A: Locate hole at least 6 inches on the furnace
side of the draft control.
Note B: Ideally, hole should be at least 12 inches from
breeching or elbow.
10 UnitaryProductsGroup
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