Lennox OHR23 Series Скачать руководство пользователя страница 18

Page 18

E − Burner Adjustment

The following steps are essential to the proper operation of
OHR23 series oil furnaces. To prevent sooting, these in-
structions must be followed in sequence:

1 − Draft

This test should be taken at the breach between the outlet
of the vent connector and the barometric draft control. Gen-
erally a 1/4" hole will need to be drilled for the draft gauge to
be inserted into the vent connector.
A minimum of 0.03 draft must be established without the
burner in operation. With the burner in operation, the draft
should be 0.04 to 0.05. This is VERY critical to the flame
retention head burners.

Oil furnace installations also require careful inspection to
make sure the chimney is in good shape and can accom-
modate the products of combustion. The temperature in
the unconditioned space will also affect the draft if long vent
connectors are allowed to get too cold.

2 − Overfire Draft

This test should be taken with the burner in operation. Re-
move the screw from the center of the inspection port. In-
sert your draft gauge into the hole.

A reading of the overfire draft should be 0.02 less than the
reading found in the vent connector. If a positive reading is
seen at this point, the combustion fan is pumping too much
air into the heat exchanger. Make the necessary adjust-
ments at the air adjustment dial.

3 − Smoke Test

The smoke test should be taken at the hole drilled in step 1. Do
not exceed #1 smoke.

4 − CO

2

 Test

Again, take this sample at the vent pipe. With the unit firing
at a trace of smoke, take a sample of the CO

2

.

From the results of this test, a window of operation" will be
determined. This window of operation establishes some tol-
erance. The tolerance the installer builds in provides room
within the set-up for those things which might affect combus-
tion. Those things which might affect combustion can then do
so without causing the unit to start sooting/smoking. Things
which might affect combustion include a nozzle going bad,
draft that changes during different climatic conditions, dirty oil,
dirt obstructing the air inlet, etc.

To build a window of operation, set the burner up so it does
not exceed 13% co2.

5 − Retest the Smoke

With a drop in the CO

2

 and increase in the air you should

see that the smoke has returned to 0.

6 − Retest the Overfire Draft

This test serves to confirm that you have not increased the
air too much. Again you do not want a positive pressure at
the test port. It should still be 0.02 less than the draft pres-
sure reading taken at the breach. You may need to in-
crease the stack draft by adjusting the barometric draft con-
trol.

7 − Stack Temperature

Take a stack temperature reading in the vent pipe. Subtract
the room air temperature from the stack temperature. This
will give you the net stack temperature. Use the efficiency
charts provided in most CO

2

 analyzers to determine fur-

nace efficiency.

Service

A−Servicing Filter

NOTE − Under no circumstances should the access panels to
the blower compartment be left off or left partially open.

 1− Throw-Away Type Filters  Filters should be checked

monthly and replaced when necessary to assure prop-
er furnace operation. Replace filters with like kind and
size filters.

 2− Reusable Type Filters  Filters should be checked

monthly and cleaned when necessary to assure prop-
er furnace operation. Use warm water and a mild de-
tergent. Replace filter when dry. Permanent filters
supplied with OHR23 furnaces do not require oiling af-
ter cleaning. Examine filter label for any for special in-
structions that may apply.

B − Blower

Blower motor is pre−lubricated and sealed for extended op-
eration. No further lubrication is required. Disconnect pow-
er to unit before cleaning blower wheel for debris.

C − Nozzle

Replace nozzle every year to to ensure proper operation.
Clogged nozzles will result in improper firing or non-firing
of unit.

D − Flue Pipe Inspection

The flue pipe should be inspected annually by a qualified
service technician. Remove and clean any soot or ash
found in the flue pipe. Inspect pipe for holes or rusted
areas. If replacement is necessary, replace with the same
size and type as required by code. Inspect the flue draft
control device and replace if found defective.

E − Cleaning Heat Exchanger

 1− Remove the vent pipe from the furnace.

 2− Remove the locking screws and the caps from the

clean−out tubes. Remove flue access elbow.

 3− Using a long spiral wire brush, sweep down the outer

drum of the heat exchanger. Then using the hose at-
tachment, vacuum out loose debris.

 4− Remove the locking screw and cap from the observa-

tion tube and with the spiral wire brush, reach upward
toward the rear of the heat exchanger to clean out the
crossover tube.

CAUTION

Do not attempt to clean the combustion chamber. It
can be easily damaged.

 5− Replace the clean−out caps and flue access elbow.

Make sure locking screws are secure.

Содержание OHR23 Series

Страница 1: ...e or maintenance can cause injury or property damage Refer to this manual For assistance or additional information consult a qualified installer or service agency INSTALLATION INSTRUCTIONS OHR23 SERIES UNITS OIL UNITS 504 628M 38152A061 06 04 Supersedes 4 02 Table of Contents General 1 Unit Dimensions 2 OHR23 Unit Parts Arrangement 3 Oil Burner Parts Arrangement 3 Requirements 4 Installation 5 Sup...

Страница 2: ... in 19 mm Inch above Floor Level RETURN AIR OPENING 3 4 19 3 4 19 3 4 19 FRONT OF FURNACE COMBUSTIBLE FLOOR SUPPLY AIR DUCT Not Furnished 140 15 4 105 120 16 1 4 413 20 1 4 514 140 154 16 1 4 413 20 1 4 514 105 120 G 59 1499 59 1499 53 1346 14 1 2 368 32 1 2 826 H 32 1 2 826 H HEAT EXCHANGER CLEAN OUT PORTS 3 HEAT EXCHANGER CLEAN OUT PORTS 3 Return Air Return Air Page 2 OHR23 Unit Dimensions Inche...

Страница 3: ... RETAINING 1 4 HEX HEAD SCREW FB HEADS ASSY FOR AIR TUBE ASSY ELECTRODE HEAD NOZZLE LINE PEDESTAL ADAPTER NOZZLE AIR SCOOP INLET WHEEL BLOWER FLANGE GASKET MOTOR 4X4 BOX IGNITOR DOOR GASKET REAR ACCESS COUPLING FUEL PUMP PLATE ESCUTCHEON NUT SPLINED DOOR ASSY REAR ACCESS ASSY HOUSING MAIN SCREWS AIR TUBE FLANGE ASSY ELECTRODE 6 5 4 3 7 0 8 ELECTRONIC IGNITION TRANSFORMER PRIMARY CONTROL AIR ADJ DI...

Страница 4: ...r opening shall be no more than 6 inches from the room s ceiling The combustion air opening should provide a minimum free area one half square inch per 1 000 Btu per hour input This combustion air should be brought into the area con taining the furnace below the level of the furnace burner IMPORTANT An opening to the outside for combustion air is strongly recommended especially in new homes Refer ...

Страница 5: ...t when facing the front the warm discharge is to the right 2 Remove the nuts in the bracket that hold the burner to the furnace front Rotate the burner and burner mount ing plate 180 and reinstall the nuts 3 Remove the screws that hold the limit control in place Use the provided knockout hole to relocate the limit control to the top side of the front panel Installation on Non Combustible Material ...

Страница 6: ...0 154 Filter Rack Installation 1 Slide filter rack over return duct flanges 2 Using a scriber through the filter rack mounting holes mark seven mounting hole locations in the return end of the cabinet See figure 4 3 Remove filter rack and drill 1 8 diameter holes at the marked positions 4 Place filter rack in position again and secure it to the cabinet using the sheet metal screws provided Clear a...

Страница 7: ...sembly is attached to the vestibule panel by three nuts Slots are provided in the mounting flange for re moving the burner assembly from the vestibule By loosen ing the nuts and by turning the whole burner assembly counterclockwise figure 5 the entire burner assembly will come out of the furnace There is adequate wire to remove the burner without disconnecting wires Once removed just turn the burn...

Страница 8: ...the furnace 4 Pipe should be at least 24 gauge galvanized 5 Single wall vent pipe should not run outside or through any unconditioned space 6 Chimney should extend 3 feet 0 9 m above highest point where the vent passes through the roof and 2 feet 0 6 m higher than any portion of a building within a horizontal distance of 10 feet 3 m 7 The vent must not pass through a floor or ceiling Clear ances t...

Страница 9: ...ir Requirements CAUTION Insufficient combustion air can cause headaches nausea dizziness or asphyxiation It will also cause excess water in the heat exchanger resulting in rust ing and premature heat exchanger failure It can also cause property damage All oil fired appliances require air to be used for the com bustion process If sufficient amounts of combustion air are not available the furnace or...

Страница 10: ...he top of the enclosure and one within 12 305 mm of the bottom These openings must communicate directly or by ducts with the outdoors or spaces crawl or attic that freely communicate with the outdoors or indirectly through vertical ducts Each opening shall have a minimum free area of 1 square inch 6 4 square centimeters per 4 000 Btu 1172 W per hour of total input rating of all equipment in the en...

Страница 11: ...ss sec tional area as the free area of the openings to which they connect The minimum dimension of rectangular air ducts shall be no less than 3 76 mm In calculating free area the blocking effect of louvers grilles or screens must be considered If the design and free area of protective cover ing is not known for calculating the size opening required it may be assumed that wood louvers will have 20...

Страница 12: ...ween the space in which the appliances re maining connected to the common venting system are located and other spaces of the building Turn on clothes dryers and any appliances not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they will operate at maximum speed Do not operate a summer exhaust fan Close fireplace dampers 4 Following the ...

Страница 13: ... Use the least number of elbows and angles possible Slope flue pipe toward chimney approximately 1 4 for every foot of horizontal run Flue pipe or vent connector must be inserted into but not beyond the outside wall of the chimney flue Where two or more appliances vent into a common flue the area of the common flue should be at least equal to the area of the largest flue or vent connector plus 50 ...

Страница 14: ...ts of a return line that purges the fuel pump of air by return ing it to the tank To determine the run and lift for piping refer to table 5 To determine the length of the run for piping refer to table 4 Figure 17 Oil Piping ÎÎÎÎÎ ÎÎÎÎÎ ÎÎ ÎÎÎÎÎÎÎÎÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎÎ fuel pump Aux Filter Return pipe Fill Pipe Air Vent Oil Tank Inlet Return pipe H 3 4 76 mm 102 mm R outside tank fuel pump above botto...

Страница 15: ...te where it should air may enter the system and prime may be lost An oil filter is required for all models Install filter inside the building between the tank shut off valve and the burner Locate filter close to burner for easy maintenance Table 6 lists the filters for the OHR23 furnace Table 6 Installation Clearances inches mm Oil Filters Cat Number 10 micron filter no mounting bracket 81P89 10 m...

Страница 16: ...Page 16 Figure 18 Fan Control Board thermostat terminal strip Figure 19 Typical OHR23 Wiring Diagram ...

Страница 17: ... with unit off Attach pressure gauge to pump outlet Turn unit on and check pressure and compare to table 4 Adjust if necessary B Temperature Rise To measure temperature rise place plenum thermometers in warm air and return air plenums Locate thermometer in warm air plenum where thermometer will not see the heat exchanger to prevent it from picking up radiant heat Set thermostat to its highest sett...

Страница 18: ...irm that you have not increased the air too much Again you do not want a positive pressure at the test port It should still be 0 02 less than the draft pres sure reading taken at the breach You may need to in crease the stack draft by adjusting the barometric draft con trol 7 Stack Temperature Take a stack temperature reading in the vent pipe Subtract the room air temperature from the stack temper...

Страница 19: ... Secure Supply Voltage Electrical Connections Tight Job Name Installer Unit Model No Job No City City Serial No Date State Serviceman Draft Reading recommended 03 04 inches w c Flue Connections Tight HEATING SECTION THERMOSTAT Calibrated Heat Anticipator Properly Set Level Blower Motor Amps Blower Motor H P Blower Motor Lubrication O K Piping Connections Tight Vent Clear State Temperature Rise Fan...

Страница 20: ...nergized Circulating fan is energized at the cool speed Cooling compressor turns on immediately Thermostat ends call for cool G and Y terminals are de energized Circulating fan and cooling compressor turn off immediately Thermostat begins call for fan G terminal is energized Circulating fan is energized immediately at cool speed ST9103A may be factory configured to operate heat speed in this mode ...

Страница 21: ...y control If the burner starts fault is in the Flame detector exposed to light Seal off false source of light the burner starts fault is in the detector circuit short circuit in the flame detec tor Replace detector Primary or auxiliary control Check adjustment Set the maximum setting Place trouble light between the black and white leads No light indicates that no power is going Primary or auxiliar...

Страница 22: ...pect the nozzle for plugged Nozzle strainer plugged Replace nozzle with the same size spray angle and spray type spect t e o e o p ugged orifice or carbon build up around orifice Poor or off center spray type Fouled or shorted electrodes Clean electrode leads Dirty electrodes and leads Clean electrode leads Eroded electrode tips Cl l t d ti d t Improper electrode gap spacing Clean electrode tips a...

Страница 23: ...tinues to run d t l k Too much air lean short fire Reduce combustion air check combustion Poor Fire does not lock out of safety fault may be Too little air long dirty fire Increase combustion air check combustion fault may be due to poor fire Inspect fi Excessive draft Adjust barometric damper for correct draft After burner p fire Too little draft or restriction Correct draft or remove restric tio...

Страница 24: ...roperly rotating wheel Restrictions in return or supply air system Correct cause of restriction Adjustable limit control set too low Reset limit to maximum stop setting Power If voltage fluctuates fault is in the power source Recheck voltage Loose wiring connection Locate and secure connection Power power source Recheck voltage at the power source Low or fluctuating line voltage Call power company...

Страница 25: ...tack tem reading more than a trace Incorrect burner head adjust ment Correct burner setting CO2 stack tem perature and smoke Too little combustion air Increase combustion air smoke Too little blower air Increase blower speed to maintain proper temp rise High stack tem Blower belt too loose if equipped Tighten blower belt High stack tem perature is more than Dirty or plugged heat exchanger Clean he...

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