New Yorker M Service manual

INSTALLATION, OPERATING
AND SERVICE INSTRUCTIONS
FOR microTEK3™
OIL FIRED BOILER
PACKAGED HEATING UNIT
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M24500R5-7/07 Price - $3.00

2
IMPORTANT INFORMATION - PLEASE READ THIS PAGE CAREFULLY
1. THIS BOILER HAS LIMITED WARRANTIES, COPIES OF WHICH ARE PRINTED ON THE BACK COVER OF THIS MANU-
AL.
2. THIS BOILER IS SUITABLE FOR INSTALLATION ON COMBUSTIBLE FLOORING. BOILER CAN NOT BE IN-
STALLED ON CARPETING.
3. ALL BOILERS MUST BE INSTALLED IN ACCORDANCE WITH NATIONAL, STATE AND LOCAL PLUMBING,
HEATING AND ELECTRICAL CODES AND THE REGULATIONS OF THE SERVING UTILITIES WHICH MAY DIF-
FER FROM THIS MANUAL. AUTHORITIES HAVING JURISDICTION SHOULD BE CONSULTED BEFORE INSTAL-
LATIONS ARE MADE.
IN ALL CASES, REFERENCE SHOULD BE MADE TO THE FOLLOWING STANDARDS:
A. Current Edition of American National Standard ANSI/NFPA 31, “Installation of Oil Burning Equipment”, for clearances between boiler, vent connector and
combustible material.
B. Current Edition of American National Standard ANSI/NFPA 211, “Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances”, For Chimney require-
ments, type of venting material and clearances between vent connector pipe and combustible materials.
C. Current Edition of American Society of Mechanical Engineers ASME CSD-1, “Controls and Safety Devices for Automatically Fired Boilers”, for assembly
and operations of controls and safety devices.
4. ALL HEATING SYSTEMS SHOULD BE DESIGNED BY COMPETENT CONTRACTORS AND ONLY PERSONS KNOWL-
EDGEABLE IN THE LAYOUT AND INSTALLATION OF HYDRONIC HEATING SYSTEMS SHOULD ATTEMPT INSTALLA-
TION OF ANY BOILER.
5. THE BOILER MUST BE CONNECTED TO AN APPROVED CHIMNEY IN GOOD CONDITION. SERIOUS PROPERTY
DAMAGE COULD RESULT IF THE BOILER IS CONNECTED TO A DIRTY OR INADEQUATE CHIMNEY. THE INTERIOR
OF THE CHIMNEY FLUE MUST BE INSPECTED AND CLEANED BEFORE THE START OF THE HEATING SEASON
AND SHOULD BE INSPECTED PERIODICALLY THROUGHOUT THE HEATING SEASON FOR ANY OBSTRUCTIONS. A
CLEAN AND UNOBSTRUCTED CHIMNEY FLUE IS NECESSARY TO ALLOW NOXIOUS FUMES THAT COULD CAUSE
INJURY OR LOSS OF LIFE TO VENT SAFELYAND WILL CONTRIBUTE TOWARD MAINTAINING THE BOILER’S EF-
FICIENCY.
6. READ THE LITERATURE ENCLOSED BY THE MANUFACTURER WITH THE VARIOUS ACCESSORY DEVICES. THESE
ACCESSORY DEVICES MUST BE INSTALLED AND USED ACCORDING TO THE RECOMMENDATIONS OF THE MANU-
FACTURER.
7. IT IS THE RESPONSIBILITY OF THE INSTALLING CONTRACTOR TO SEE THAT ALL CONTROLS ARE CORRECTLY
INSTALLED AND ARE OPERATING PROPERLY WHEN THE INSTALLATION IS COMPLETED.
8. FOR OPTIMUM PERFORMANCE AND SERVICEABILITY FROM THIS UNIT ADHERE TO THE FOLLOWING RECOM-
MENDATIONS:
A. DO NOT TAMPER WITH THE UNIT OR CONTROLS. Retain your contractor or a competent serviceman to assure that the unit is properly adjusted and
maintained.
B. Clean Firetubes at least once a year - preferably at the end of the heating season to remove soot and scale. Inside of Combustion Chamber should also be
cleaned at the same time.
GNINRAW
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.evitareponi

3
SECTION I: GENERAL INFORMATION
Figure 1: microTEK3 Packaged Boiler
2. LOCATEBOILERinfrontofnalpositionbefore
removing crate. See Figure 1.
A. LOCATE so that smoke pipe connection to chimney
will be short and direct. BOILER IS SUITABLE
FOR INSTALLATION ON COMBUSTIBLE
FLOOR. Boiler can not be installed on carpeting.
B. FOR BASEMENT INSTALLATION, provide a
solidbase,suchasconcrete,ifoorisnotlevelorif
watermaybeencounteredonooraroundBoiler.
C. PROVIDE SERVICE CLEARANCE of at least 24”
clearance in front for servicing.
D. For minimum clearances to combustible materials
See Figure 2.
1. INSPECT SHIPMENT carefully for any signs of
damage.
A. ALL EQUIPMENT is carefully manufactured,
inspected and packed. Our responsibility ceases
upon delivery of crated Boiler to the carrier in good
condition.
B. ANY CLAIMS for damage or shortage in shipment
mustbeledimmediatelyagainstthecarrierbythe
consignee. No claims for variances from, or shortage
in orders, will be allowed by the manufacturer
unless presented within sixty (60) days after receipt
of goods.
Approximate shipping weight: 325 pounds
Water content: 6.1 gallons
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Water Content: 6.1 Gallons
I. General Information ...............................3
II. Installation Instructions..........................4
III. Operating & Service Instructions..........11
TABLE OF CONTENTS
IV. Boiler Cleaning .....................................19
V. Repair Parts...........................................20
VI. Appendix
Low Water Cut Off................................25

4
SECTION II: INSTALLATION INSTRUCTIONS
2. REMOVAL OF BOILER FROM SKID
A. Tilt boiler, "walk" boiler backward, and set rear
legsdownonoor.Tiltboilerbackward,pull
skid forward and set front legs down on edge of
skid. Install close coupling, tee, and plug in return
coupling, see Step 7 and Figure 4. Point tee toward
permanent return location.
1. REMOVE CRATE
A. Remove all fasteners at crate skid.
B. Lift outside container and remove all other inside
protective spacers and bracing. Remove container
containing Safety Relief Valve and Pipe Fittings.
3. PROVIDE COMBUSTION AND VENTILATION
AIR. Local code provisions may apply and should be
referenced.
D.Forboilerlocatedinanunconnedspaceofa
conventionally constructed building, the fresh
airinltrationthroughcracksaroundwindows
and doors normally provides adequate air for
combustion and ventilation.
E. Forboilerlocatedinaconnedspaceoran
unconnedspaceinabuildingofunusuallytight
construction, provide outdoor air with the use of two
permanent openings which communicate directly or
by duct with the outdoors or spaces (crawl or attic)
freely communicating with the outdoors. Locate one
opening within 12 inches of top of space. Locate
remaining opening within 12 inches of bottom of
space. Minimum dimension of air opening is 3
inches. Size each opening per following:
1. Direct communication with outdoors.
Minimum free area of 1 square inch per 4,000
BTU per hour input of all equipment in space.
2. Vertical ducts. Minimum free area of 1 square
inch per 4,000 BTU per hour input of all
equipment in space. Duct cross-sectional area
shall be same as opening free area.
3. Horizontal ducts. Minimum free area of 1
square inch per 2,000 BTU per hour input of all
equipment in space. Duct cross-sectional area
shall be same as opening free area.
Alternate method for boiler located within
conned space. Use indoor air if two permanent
openings communicate directly with additional
space(s)ofsufcientvolumesuchthatcombined
volumeofallspacesmeetcriteriaforunconned
space. Size each opening for minimum free area
of 1 square inch per 1,000 BTU per hour input
of all equipment in spaces, but not less than 100
square inches.
F. Louvers and Grilles of Ventilation Ducts
1. All outside openings should be screened and
louvered. Screens used should not be smaller
than 1/4 inch mesh. Louvers will prevent the
entrance of rain and snow.
2. Free area requirements need to consider the
blocking effect of louvers, grilles, or screens
protecting the openings. If the free area of the
louver or grille is not known, assume wood
louvers have 20-25 percent free area and metal
louvers and grilles have 60-75 percent free area.
3. Louversandgrillesmustbexedintheopen
position, or interlocked with the equipment to
open automatically during equipment operation.
A. Determine volume of space (boiler room). Rooms
communicating directly with the space in which
the appliances are installed, through openings not
furnished with doors, are considered a part of the
space.
Volume(ft3) = Length(ft) x Width(ft) x Height(ft)
B. Determine total input of all appliances in the space.
Add inputs of all appliances in the space and round
the result to the nearest 1000 BTU per hour.
C. Determine type of space. Divide Volume by total
input of all appliances in space. If the result is
greater than or equal to 50 ft3/1000 BTU per hour,
thenitisconsideredanunconnedspace.Ifthe
result is less than 50 ft3/1000 BTU per hour then the
spaceisconsideredaconnedspace.
Figure 2: Minimum Installation Clearances To
Combustible Materials
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5
B. Tilt boiler backward and remove skid. Be careful not
to damage Burner and Jacket.
3. CHANGE HINGE POSITION if necessary.
A. Look at the area where boiler will be installed. If
left side of boiler will be less than 12 inches from
a wall, move hinges to right side of boiler. See B
through J below.
B. Pull 2 halves of Burner Swing Door Interlock apart.
Swing Door Interlock is connected to T-T terminals
on R7184A Control. Lift Honeywell R7184A
Control off of Burner Junction Box, open Burner
Ignition Transformer and disconnect wiring harness
from left side of burner. Find round plastic cover
inside Junction Box and install in hole in left side of
burner.
C. Remove 8 sheet metal screws from jacket. Remove
rear jacket box and bend both sides of Jacket
Wrapper up, see Figure 18.
D. Remove 2 (two) 5/16" - 18 x 3" long hex head cap
screwsandatwashersfromrightsideofdoor.
Remove 2 hairpin cotter pins and 2 hinge pins
from hinges on left side of door and remove Door
Assembly from boiler. Inspect Front and Rear Door
Insulation Pieces and Combustion Chamber Liner,
see step 6.
E. Remove 4 hex nuts from bolts that attach hinges and
hinge spacers to left side of Tubesheet. Remove 4
hex head cap screws that attach hinges to door.
F. Attach 2 hinge brackets & spacers to Tubesheet and
2 hinge brackets to Door on right side of boiler. 3
Holes in each Hinge Bracket must line up with 3
matching holes in Spacer, Tubesheet or Door. See
Figure 3. Tighten hex nuts, bolts and screws by hand
only.
Figure 3: Hinge Installation & Assembly, microTEK3 Boiler
G. Replace door assembly. Hinge brackets attached to
door must rest on top of hinge brackets attached to
tubesheet. See Figure 3. Slide hinge pins through
hinges from top and install cotter pins. Close door
and install 5/16" - 18 x 3" long hex head cap screws
throughatwashersandleftsideofdoorandinto
tapped holes in tubesheet. Tighten all hex nuts,
bolts and screws. When door is installed properly, it
is parallel to Tubesheet when viewed from top and
sides.
H. Bend sides of Jacket Wrapper down and attach 2
Jacket Straps to 4 slots at bottom of Jacket Wrapper
sides with sheet metal screws. Install Rear Jacket
Box with 4 sheet metal screws. See Figure 18.
I. Connect wiring harness to a knockout on right side
of Junction Box and install Honeywell R7184A
Control, see Wiring Diagram, Figure 11.
Reconnect Swing Door Interlock.
4. INSTALL BOILER CONTROL.
A. Pull bulb and capillary tube out of hole in back of
control. Insert bulb in immersion well on top of
boiler and secure control with set screw in control.
B. SecureexibleconduittoJacketWrappersidewith
conduit clamp and sheet metal screw. Conduit must
be on same side of boiler as Swing Door hinges.
5. MOVE BOILER TO PERMANENT POSITION by
sliding or walking.
6. INSPECT FRONTAND REAR DOOR INSULATION
PIECES AND COMBUSTION CHAMBER LINER
A. OPEN SWING DOOR on front of boiler. Use
ashlighttoinspectinsulationpiecessecuredto
front and rear doors. Inspect Ceramic Fiber Blanket
secured to bottom of combustion chamber with
water glass adhesive. Replace any damaged pieces.

6
Figure 4: Recommended Boiler Piping for Zoning with Valves
Figure 5: Recommended Boiler Piping for Zoning with Circulators

7
E. A hot water boiler installed above radiation level
must be provided with a low water cutoff device as
part of the installation.
If a low water cut-off is required, it must be
mounted in the system piping above the boiler.
The minimum safe water level of a hot water boiler
is just above the highest water containing cavity of
the boiler; that is, a hot water boiler must be full of
water to operate safely.
F. There are many possible causes of oxygen
contamination such as:
1. Addition of excessive make-up water as a result
of system leaks.
2. Absorptionthroughopentanksandttings.
3. Oxygen permeable materials in the distribution
system.
In order to insure long product life, oxygen sources
should be eliminated. This can be accomplished by
taking the following measures:
1. Repairing system leaks to eliminate the need for
addition of make-up water.
2. Eliminating open tanks from the system.
3. Eliminatingand/orrepairingttingswhichallow
oxygen absorption.
4. Use of non-permeable materials in the distribution
system.
5. Isolating the boiler from the system water by
installing a heat exchanger.
7. CONNECT SUPPLY AND RETURN PIPING TO
HEATING SYSTEM
A. Hot water pipes shall have clearances of at least ½”
from all combustible construction.
B. Use a system by-pass if the boiler is to be operated
in a system which has a large volume or excessive
radiation where low boiler water temperatures may
be encountered (i.e. converted gravity circulation
system, etc.).
Valves should be located in the by-pass and return
line as illustrated in Figures 4 and 5 in order to
regulatewaterowformaintenanceofhigherboiler
water temperature.
Set the by-pass and return valves to a half throttle
position to start. Operate boiler until the system
water temperature reaches its normal operating
range.
Adjust the valves to maintain 180°F to 200°F boiler
water temperature and greater than 120°F return
temperature. Adjust both valves simultaneously.
Closing the boiler return valve while opening
the by-pass valve will raise the boiler return
temperature. Opening the boiler return valve while
closing the by-pass valve will lower the boiler return
temperature.
C. If this boiler is used in connection with refrigeration
systems, the boiler must be installed so that the
chilled medium is piped in parallel with the heating
boiler using appropriate valves to prevent the chilled
medium from entering the boiler, see Figure 6. Also
consult I = B = R Installation and Piping Guides.
D. If this boiler is connected to heating coils located
in air handling units where they may be exposed to
refrigerated air the boiler piping must be equipped
withowcontrolvalvestopreventgravity
circulation of boiler water during the operation of
the cooling system.
Figure 6: Recommended Piping for Combination
Heating & Cooling
(Refrigeration) Systems
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8. INSTALL SMOKEPIPE — The microTEK3™ should
beventedintoareclaytile-linedmasonrychimney
or a chimney constructed from Type L Vent or a
factory built chimney that complies with the Type
HT requirement, of UL103. The chimney and vent
pipeshallhaveasufcientdraftatalltimes,toassure
safe proper operation of the boiler. See Figure 7 for
recommended installation.
A. Install the draft regulator following the instructions
furnished with the regulator. See Figure 8 for
alternate draft regulator locations.
B. Consider the chimney overall. Chimneys that have
a high heat loss may become less suitable as the
heatlossofthehomegoesdownandtheefciency
of the boiler installed goes up. Most homes have
a chimney appropriate for the fuel and the era in
which the home was built. That may have been a

8
Figure 9
coalredoraninefcientoilredboilerbuiltinto
a home without insulation or storm windows. With
increasing fuel prices that home probably has been
insulatedandttedwithstormwindowssothat
the heat loss of the home has been reduced. This
requires less fuel to be burned and sends less heat up
the chimney.
 Anewboilerprobablyhasahigherefciencythan
the boiler being replaced. That probably means that
the stack temperature from the new boiler will be
lower than that from the old boiler and with less
room air being drawn up the chimney to dilute the
stack gases. The combination of a large uninsulated
chimney,reducedringrate,reducedringtime,
lower stack temperature and less dilution air can,
in some cases, contribute to the condensing of
Figure 8
Figure 7
small amounts of water vapor in the chimney. Such
condensation, when it occurs, can cause chimney
deterioration. In extreme cases, condensed water
may be visible on the outside of the breeching or
chimney. In those extreme cases, the chimney may
have to be lined to insulate the chimney and thus
prevent the condensation. The addition of dilution
air into the chimney may assist in drying the
chimney interior surfaces.
C. Heat extractors mounted into the breeching are not
recommended.
9. INSTALL ELECTRIC WIRING in accordance with
National Electrical Code and local regulations. A
separate ELECTRICAL CIRCUIT must be run from
the main electrical service with an over-current
device/disconnect in the circuit. A service switch is
recommended and may be required by some local
jurisdictions. Wiring should conform to Figures 11A
and 11B.
10. FUEL UNITS AND OIL LINES
 Useexibleoilline(s)sothatSwingDoorcanbe
opened without disconnecting oil supply.
 Asupplylinefueloillterisrecommendedasa
minimumforallringratesbutapleatedpaperfueloil
lterisrecommendedforthelowest(.6GPH)ring
rate application to prevent nozzle fouling.
SINGLE-PIPE OIL LINES — Standard burners are
provided with single-stage 3450 rpm fuel units with the
by-pass plug removed for single-pipe installations.
The single-stage fuel unit may be installed single-pipe
with gravity feed or lift. Maximum allowable lift is 8
feet. See Figure 9.
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9
Figure 10
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'2 '37 '001
'3 '86 '001
'4 '36 '001
'5 '75 '001
'6 '25 '001
'7 '74 '001
'8 '24 '001
'9 '63 '001
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TWO-PIPE OIL LINES - For two-pipe systems
where more lift is required, the two-stage fuel unit is
recommended. Tables 2 (single-stage) and 3 (two-stage)
show allowable lift and lengths of 3/8-inch and ½-inch
OD tubing for both suction and return lines. Refer to
Figure 10.
Be sure that all oil line connections are absolutely
airtight.
 Checkallconnectionsandjoints.Flaredttingsare
recommended.Donotusecompressionttings.
Open the air-bleed valve and start the burner. For clean
bleed, slip a 3/16” ID hose over the end of the bleed
valve and bleed into a container. Continue to bleed for
15 seconds after oil is free of air bubbles. Stop burner
and close valve.

10
Figure 11B: Wiring Diagram for microTEK3 Boilers with Beckett AFG Burner,
Smart Control, and Honeywell L4080B High Limit
SEQUENCE OF OPERATION
Refer to Smart Manual for wiring and operation details.
Figure 11A: Wiring Diagram for microTEK3 Boilers with Beckett AFG Burner and Split Controls
SEQUENCE OF OPERATION
A call for heat by the thermostat energizes the L7248C control which in turn energizes the R7184B primary control.
The burner will initiate ignition after completing a 10 second pre-purge cycle. If burner ignites within approximately 45
seconds and the cad cell sees ame, the burner will continue to operate until the call for heat is satised or the setting
of the high limit is reached. The circulator will operate as long as the thermostat is calling for heat. If the thermostat is
not satised and the high limit is reached, the circulator will continue to operate, and the burner will stop until the high
limit is closed by a drop in boiler water temperature.

11
SECTION III: OPERATING AND SERVICE INSTRUCTIONS
1. ALWAYS INSPECT INSTALLATION BEFORE
STARTING BURNER.
2. FILL HEATING SYSTEM WITH WATER.
NOTE: It is important to properly remove the oil and
dirt from the system.
CLEAN HEATING SYSTEM If boiler water is dirty,
refer to step 13 for proper cleaning instructions.
A. Fill entire Heating System with water and vent air
from system. Use the following procedure on a
Series Loop or Multi-Zoned System installed as per
Figures 4 and 5, to remove air from system when
lling:
(1) Close isolation valve in boiler supply piping.
(2) Isolate all circuits by closing zone valves or
balancing valves.
(3) Attach a hose to hose bib located just below
isolation valve in boiler supply piping.
(Note-Terminatehoseinvegallonbucketata
 suitableoordrainoroutdoorarea).
(4) Starting with one circuit, open zone valve.
(5) Open hose bib.
(6) Openllvalve(Make-upwaterlineshouldbe
located directly above isolation valve in boiler
supply piping).
(7) Allowwatertooverowfrombucketuntildis-
charge from hose is bubble free for 30 seconds.
(8) Open zone valve to the second zone to be
purged,thenclosetherst.Repeatthisstepuntil
all zones have been purged, but always have one
zone open. At completion, open all zone valves.
(9) Closehosebib,continuellingthesystemuntil
thepressuregaugereads12psi.Closellvalve.
(Note - If make-up water line is equipped with pressure
 reducingvalve,systemwillautomaticallyllto
12 psi. Leave globe valve open).
(10) Open isolation valve in boiler supply piping.
(11) Remove hose from hose bib.
3. CHECK CONTROLS, WIRING AND BURNER to
be sure that all connections are tight and burner is rigid,
that all electrical connections have been completed and
fusesinstalled,andthatoiltankislledandoillines
have been tested.
4. LUBRICATION — Follow instruction on burner
and circulator label to lubricate, if oil lubricated. Most
motors currently used on residential type burners
employ permanently lubricated bearings and thus do
notrequireanyeldlubrication.Waterlubricated
circulatorsdonotneedeldlubrication.
Do not over-lubricate. This can cause as much trouble as no
lubrication at all.
5. ADJUST CONTROL SETTINGS with burner service
switch turned “ON” and room thermostat set 10°
below room temperature.
A. Adjustment and display modes of the L7248/
L7224 Oil Electronic Aquastat Controller.
(1) On the L7248/L7224, the overall range of the
High Limit is from 180°F to 240°F (82°C to
116°C).
(2) Set the High Limit (designated HL) on the
L7248/L7224 Aquastat Control at 180°F. This
temperature setting may be varied to suit
requirementsofinstallation.Differentialisxed
at 15°F.
i. Adjusting Settings:
To discourage unauthorized changing of
Aquastat settings, a procedure to enter the
adjustment mode is required. To enter the
adjustment mode, press the UP, DOWN,
and Ibuttons (see Figure 12) simultaneously
for three (3) seconds. Press the ‘I’ button
until the feature requiring adjustment is
displayed (press the “I” button again and
will display LL (Low Limit on L7224):
· High Limit
·°F -- °C (Toggle)
Then press the UP and/or DOWN buttons
to move the set point to the desired value.
After 60 seconds without any button inputs,
the control will automatically return to the
READ mode.
GNINRAW
erevesesuacnachcihwdrazahlaitnetopaevahroodgniwsrenrubhtiwdeppiuqesreliobllA
ffonrut,roodgniwsgninepoerofeB.derongifiefilfossolroyrujnilanosrep,egamadytreporp
gniriwkcolretnIrooDgniwSrenruBfosevlahowttcennocsiddnareliobothctiwsecivres
oteruseB.rebmahcnoitsubmocehtedistuorenrubfogniriflatnediccatneverpotssenrah
rooDgniwSrenruBfosevlahowttcennocerdnayletelpmocrenetsafroodgniwsnethgit
.detelpmocsiecivresnehwkcolretnI

12
Figure 12: L7248 Circuit Board Layout -
Horizontal Mount
ii. Display:
In the RUN mode, the Aquastat will
ash“bt”(boilertemp.)followedbythe
temperature (i.e., 220), followed by °F or
°C.
To read boiler settings, press the ‘I’key to
read the parameter of interest. For example,
press I (HL) High Limit is displayed,
followed by a three-digit number, i.e., 220,
followed by °F or °C.
See Figure 13 for Display Readout
Denitions.
Figure 13: Display Readout Denitions
Display
Text Description Shows
bt Boiler Temperature
HL High Limit
err Error Code
f Degrees Fahrenheit
c Degrees Celsius
LL Low Limit
After approximately 60 seconds without
any key pressed, the display will enter a
dim display mode. To return to the bright
display mode, simply press any key.
B. Control Operating Characteristics
The L7248/L7224 can be in any three (3)
operational states: Normal, High-Limit and Error.
The controller moves back and forth from High-
Limit to Normal state as part of normal operation.
The controller will enter the Error state when there
is an abnormal condition. The operating states are:
(1) Normal: Boiler temperature has gone below the
high limit setting (minus the differential) and has
not exceeded the high limit setting.
(2) High-Limit: Boiler temperature has gone above
the high limit setting and has not dropped below
the high limit setting (minus the differential).
(3) Error: The controller has detected an error
condition (e.g., open sensor) and has shut down
the burner output. The controller continues to
monitor the system and automatically restarts if
the error condition clears. See Table 4.
(4) Low-Limit: Boiler temperature has gone
below the low limit setting (minus the low limit
differential) and has not gone above the low limit
setting.
TABLE 4: LED ERROR CODES
rorrE
edoC noitcA/esuaC
1rrE .rosneskcehc;tluafrosneS
2rrE .gniriw™MOCarivnEkcehc;tluafMOCE
3rrE .lortnocecalper;tluaferawdraH
(5) The operating sequence for L7248/L7224 is
described below and shown in Table 5.
noitcA esnopseRmetsyS
tatsomrehT
rofsllac
taeh
.stratsrotalucriC
renruB.dekcehcsierutarepmetrelioB
sierutarepmetretawehtnehwstratser
.gnittestimilhgihwoleb
relioB
ehtsdeecxe
timilhgih
nehwstratserrenruB.ffodenrutsirenruB
ehtwolebsporderutarepmetretaweht
.laitnereffidehtsunimgnittestimilhgih
tatsomrehT
deifsitassi
.ffonrutrenrubdnarotalucriC
rorrE
noitidnoc
stuptuolla,detcetedsinoitidnocrorrenafI
lortnoC.ffosirenruB.nwodtuhsera
nehwstratserdnanoitcnufotseunitnoc
.detcerrocsirorre
eht,ecneuqeskcehcrorreehtgniruD
dnarosnesehtnitfirdrofskcehcmetsys
.snoitcennocehtninoisorroc
TABLE 5: L7248/L7224 CONTROLLER
OPERATING SEQUENCE
The switching action in the L7248/L7224 control
has one setting, the high limit, see Figure 14.
The switching relay is controlled by the low
voltage room thermostat. On a call for heat, the
relay contacts make to complete the line voltage
circulator circuit and also the burner circuit if the
boiler water temperature is below the high limit
setting. The high limit switch shuts off the burner
if boiler water temperature exceeds the high limit
setting. The circulator will continue to operate

13
as long as the thermostat is calling for heat. The
high limit automatically resets after the water
temperature drops past the setpoint and through
the differential.
Figure 14: L7248/L7224 Setpoint and Differential
Switching Action
6. REMOVE GUN ASSEMBLY
microTEK3 Boilers are equipped with Beckett AFG
burners as standard. Items to be checked are nozzle
size, type, and angle; head size, (and setting on MD(V1)
head); gun setting; and positioning of electrodes. This
information is shown in Figure 15, and Table 6. If the
desiredboilerringrateis0.6GPH,thenozzlemustbe
changedout,thelowringratebafemustbeinstalled
and the factory settings must be changed according
to Table 6. These parts are in the bag attached to the
burner. Reinstall gun assembly.
7. ADJUST OIL BURNER BEFORE STARTING
A. SET BURNER AIR BAND AND AIR
SHUTTER see Table 6.
B. OPEN ALL OIL LINE VALVES.
C. Attachaplastichosetofuelpumpventttingand
provide a pan to catch the oil.
D. REMOVE GAUGE PORT PLUG from fuel pump
and install pressure gauge.
E. REMOVE FLAME PLUG IN SWING DOOR.
8. START OIL BURNER
A.Openventttingonfuelpump.
B. TURN ‘ON’ BURNER service switch and allow
burnertorununtiloilowsfromventtting
in a SOLID stream without air bubbles for
approximately 10 seconds.
C. Closeventttingandburnerameshouldstart
immediately after pre-purge is complete. Pre-purge
preventsburnerameuntil10secondshaselapsed
after initial power is applied to burner. During
pre-purge, the motor and ignitor will operate but the
oil valve will remain closed. Refer to Oil Primary
Control Instructions for more details.
9. ADJUST OIL PRESSURE
A. Locate oil pressure adjusting screw and turn screw
to obtain the oil pressure indicated in Table 4.
B. DO NOT REMOVE PRESSURE GAUGE until
later.
10. OTHER ADJUSTMENTS
A. ADJUST THE AIR BAND AND/OR AIR
SHUTTER
Beckett Burners:
Adjust air supply by loosening lock screws and
moving the air shutter and if necessary the air band.
Refer to Table 6 for preliminary settings.
B. ADJUST DRAFT REGULATOR for a draft of 0 to
maximum of -.03" (water gauge) in the breeching
after chimney has reached operating temperature
and while burner is running. Burner will operate
withapositivedraftoverreandzerodraftin
the breeching. Adjust Draft Regulator such that
maximum draft of -.03" is reached in coldest
weather.
C. READJUST AIR BANDS on burner for a light
orangecoloredame.Useasmoketesterandadjust
air for minimum smoke (not to exceed #1) with a
minimumofexcessair.Makenalcheckusing
suitable instrumentation to obtain a CO2of 11.5 to
12.5%.Thesesettingswillassureasafeandefcient
operatingcondition.Iftheameappearsstringy
insteadofasolidre,tryanothernozzleofthesame
type. Flame should be solid and compact. After all
adjustments are made recheck for a draft of zero to
-.03" (water gauge) in breeching.
D. TURN “OFF” BURNER and remove pressure
gauge. Install gauge port plug and tighten. Start
burner again.
E. CAD CELL LOCATION AND SERVICE
 Theburnerissuppliedwithacadmiumsuldeame
detector mounted at the factory, mounted on the
bottom of the transformer. See Figure 16. To service
cad cell or to replace the plug in portion, swing open
the transformer. After service is complete, be sure to
fasten down the transformer.
F. FLAME FAILURE
The microTEK3 boiler controls operate the burner
automatically. If for unknown reasons the burner
ceasestoreandtheresetbuttonontheprimary
control has tripped, the burner has experienced
ignition failure. Before pressing the reset button call
your serviceman immediately.

14
Warning:
This product contains refractory ceramic bers (RCF). RCF has been classied as
a possible human carcinogen. After this product is red, RCF may, when exposed
to extremely high temperature (>1800F), change into a known human carcinogen.
When disturbed as a result of servicing or repair, RCF becomes airborne and, if
inhaled, may be hazardous to your health.
AVOID Breathing Fiber Particulates and Dust
Precautionary Measures:
Do not remove or replace previously red RCF (combustion chamber insulation,
target walls, canopy gasket, ue cover gasket, etc.) or attempt any service or
repair work involving RCF without wearing the following protective gear:
1. A National Institute for Occupational Safety and Health (NIOSH)
approved respirator
2. Long sleeved, loose tting clothing
3. Gloves
4. Eye Protection
• Take steps to assure adequate ventilation.
• Wash all exposed body areas gently with soap and water after contact.
• Wash work clothes separately from other laundry and rinse washing
machine after use to avoid contaminating other clothes.
• Discard used RCF components by sealing in an air tight plastic bag.
First Aid Procedures:
• If contact with eyes: Flush with water for at least 15 minutes. Seek
immediate medical attention if irritation persists.
• If contact with skin: Wash affected area gently with soap and water.
Seek immediate medical attention if irritation persists.
• If breathing difculty develops: Leave the area and move to a location
with clean fresh air. Seek immediate medical attention if breathing
difculties persist.
• Ingestion: Do not induce vomiting. Drink plenty of water. Seek
immediate medical attention.
noitamrofnIytefaStcudorPtnatropmI
tcudorPrebiFcimareCyrotcarfeR

15
Figure 15: "L1 and "V1 Head Electrode Positioning and Gun Setting (Beckett AFG)
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rerutcafunaM HPG elgnA epyT riA
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riA
dnaB daeH
pmuP
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)GISP(
1-3KETorcim *06.0 )1L(BM U8/3-3 roogaH 05.0 °07 B 5 0 A/N 041
00.1 navaleD 58.0 °06 B 01 0 A/N 041
2-3KETorcim +52.1 )1V(DM U4/3-2 navaleD 01.1 °54 B 01 5.1 0 041
.tnemerusaemedixoiDnobraCdnaekomSybdeifirevebtsumdnaetamixorppaerasgnitteS
.launaMehtfotxeTeeS.yrassecenerehwtsujdaeR
.etargnirifHPG06.0rofelffabetargnirifwolllatsnI*
.renrubHPG52.1ehtfoetargnirifehtegnahctonoD+
TABLE 6: BECKETT AFG BURNER

16
Figure 16
1. Safe Start
a. Jumper the yellow cad cell leads.
b. Follow procedure to turn on burner. Burner
must not start, indictor light turns on and
control remains in Idle Mode.
2. Simulate Flame Failure.
a. Follow procedure to turn on burner.
b. Close hand valve in oil supply line.
c. Device enters recycle mode.
d. Device tries to restart system after
approximately 60 seconds.
e. Safety switch locks out approximately in
safety switch timing indicated on label.
Indicatorlightashesat1Hzrate.Ignition
and motor stop and oil valve closes.
3. Simulate Ignition Failure.
a. Follow procedure to turn on burner, but do
not open oil supply hand valve.
b. Observe that safety switch locks out
approximately within safety switch timing
as indicated on the label. Indicator light
ashesat1Hzrate.Ignitionandmotorstop
and oil valve closes.
4. The indicator light on the oil primary control
provides lockout, recycle and cad cell indications
as follows:
a. Flashing at 1 Hz (½ second on, ½ second
off): system is locked out or in restricted
mode.
b. Flashing at ¼ Hz (2 seconds on, 2 seconds
off): control is in recycle mode.
c. On:cadcellissensingame.
d. Off:cadcellisnotsensingame.
C. CHECK HIGH LIMIT CONTROL. Jumper
thermostat terminals. Allow burner to operate until
shut-down by limit. Installation is not considered
complete until this check has been made.
REMOVE JUMPER.
IF CONTROLS DO NOT MEET REQUIREMENTS
OUTLINED IN PARAGRAPH 12, REPLACE CONTROL
AND REPEAT CHECK-OUT PROCEDURES.
13. BOILER AND SYSTEM CLEANING INSTRUC-
TIONS FOR TROUBLE FREE OPERATION
A. Filling of Boiler and System — General —-In a hot
water heating system, the boiler and entire system
(other than the expansion tank) must be full of water
for satisfactory operation. Water should be added to
the system until the boiler pressure gauge registers
12 psi. To insure that the system is full, water
should come out of all air vents when opened. The
microTEK3 boiler holds 6.1 gallons of water.
B. Boiling Out of Boiler and System. The oil and grease
which accumulate in a new hot water boiler can be
washed out in the following manner.
NOITUAC
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tinuehtnehw,detalumuccasahliossecxe
noitsubmocehtnehwro,ropavfollufsi
.tohyrevsirebmahc
11. CHECK FOR CLEAN CUT OFF OF BURNER
A. AIR IN THE OIL LINE between fuel unit and
nozzle will compress when burner is on and will
expand when burner stops, causing oil to squirt from
nozzle at low pressure as burner slows down and
causing nozzle to drip after burner stops. Usually
cycling the burner operation about 5 to 10 times will
rid oil line of this air.
B. IF NOZZLE CONTINUES TO DRIP, repeat step
(11a). If this does not stop the dripping, remove
cutoff valve and seat, and wipe both with a clean
cloth until clean, then replace and re-adjust oil
pressure.
12. TEST CONTROLS.
GNINRAW
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ehtfonoitarepoeht,etelpmocderedisnoc
,dekcehcebdluohsslortnocreliob
hgihdnalortnocyramirpehtylralucitrap
.lortnoctimil
A. CHECK THERMOSTAT OPERATION. Raise
and lower thermostat setting as required to start and
stop burner.
B. VERIFY PRIMARY CONTROL SAFETY
FEATURES using procedures outlined in
instructions furnished with control or instructions
following:
NOITUAC
YLNONAMECIVRESGNITAEHROF

17
1. Remove Safety Relief Valve using extreme care
to avoid damaging it.
2. Partiallyllboilerandaddcausticsodaor
trisodium phosphate. Add an appropriate amount
of recommended boil out compound.
3. Replace Safety Relief Valve.
4. Fill the entire system with water.
5. Startringtheboiler.
6. Circulate the water through the entire system.
7. Vent the system, including the radiation.
8. Allow boiler water to reach operating
temperature, if possible.
9. Continue to Circulate the water for a few hours.
10.  Stopringtheboiler.
11. Drain the system in a manner and to a location
that hot water can be discharged with safety.
12. Remove plugs from all available returns and
wash the water side of the boiler as thoroughly
as possible, using a high-pressure water stream.
13.  Rellthesystemwithfreshwater.
C. Add appropriate boiler water treatment compounds
 asrecommendedbyyourqualiedwatertreatment
company.
D. Make pH or Alkalinity Test.
After boiler and system have been cleaned and
relledaspreviouslydescribed,testthepHofthe
water in the system. This can easily be done by
drawing a small sample of boiler water and testing
with hydrion paper which is used in the same
manneraslitmuspaper,exceptitgivesspecic
readings. A color chart on the side of the small
hydrion dispenser gives the reading pH. Hydrion
paper is inexpensive and obtainable from any
chemical supply house or thru your local druggist.
The pH should be higher than 7 but lower than
11. Add appropriate water treatment chemicals,
ifnecessary,tobringthepHwithinthespecied
range. With this lower level of protection, care must
be exercised to eliminate all of the free oxygen in
the system.
E. Boiler is now ready to be put into service.
TNATROPMI
SITI,NOITAREPOLAMRONGNIRUD,FI
EROMRETAWDDAOTYRASSECEN
,HTNOMAECNONAHTYLTNEUQERF
ECIVRESDEIFILAUQATLUSNOC
METSYSRUOYKCEHCOTNAICINHCET
.SKAELROF
A leaky system will increase the volume of make-up
watersuppliedtotheboilerwhichcansignicantly
shorten the life of the boiler. Entrained in make-up
water are dissolved minerals and oxygen. When the
fresh, cool make-up water is heated in the boiler the
minerals fall out as sediment and the oxygen escapes
as a gas. Both can result in reduced boiler life. The
accumulation of sediment can eventually isolate
the water from contacting the steel. When this
happens the steel in that area gets extremely hot and
eventually cracks. The presence of free oxygen in
the boiler creates a corrosive atmosphere which, if
the concentration becomes high enough, can corrode
the steel through from the inside. Since neither of
these failure types are the result of a manufacturing
defect the warranty does not apply. Clearly it is
in everyone’s best interest to prevent this type of
failure. The maintenance of system integrity is the
best method to achieve this.
14. HINTS ON COMBUSTION
A. NOZZLES — Although the nozzle is a relatively
inexpensive device, its function is critical to the
successful operation of the oil burner. The selection
of the nozzle supplied with the microTEK3 boiler
is the result of extensive testing to obtain the best
ameshapeandefcientcombustion.Otherbrands
of the same spray angle and spray pattern may be
used but may not perform at the expected level of
CO2and smoke. Nozzles are delicate and should be
protected from dirt and abuse. Nozzles are mass-
produced and can vary from sample to sample. For
all of those reasons a spare nozzle is a desirable item
for a serviceman to have.
B. FLAME SHAPE — Looking into the combustion
chamberthroughtheameplughole,theame
should appear straight with no sparklers rolling up
towardthetopofthechamber.Iftheamedragsto
the right or left, sends sparklers upward or makes
wet spots on the rear door insulation piece, the
nozzle should be replaced. If the condition persists
look for fuel leaks, air leaks, water or dirt in the fuel
as described below.
C. FUEL LEAKS — Any fuel leak between the
pump and the nozzle will be detrimental to good
combustion results. Look for wet surfaces in the
air tube, under the transformer, and around the air
inlet. Any such leaks should be repaired as they may
cause erratic burning of the fuel and in the extreme
casemaybecomearehazard.
D. AIR LEAKS — Any such leaks should be repaired,
as they may cause erratic burning of the fuel and in
extremecasesmaybecomearehazard.
There are many possible causes of air leaks in oil
lines such as:
1. Fittingleaksduetomis-aredtubingor 
damagedtting.
2. Fuel line leak due to crushed or bent
tubing.

18
3.Filter connection leaks.
4. Tank connection leaks.
There are various test kits available to trace air
leaks, such as electronic sight glasses. Follow the
manufacturers'instructionstondairleaks.
The following actions can eliminate air leaks:
1. Bleed pump as detailed previously.
2. Replacearettings.
3. Replace oil supply line.
4. Repairoillterleaks.
5. Replaceorrepairtankttings.
E. GASKET LEAKS — If 11.5 to 12.5% CO2
with a #1 smoke or less cannot be obtained in the
breeching,lookforairleaksaroundtheuecollar.
Such air leaks will cause a lower CO2reading in
thebreeching.Thesmallertheringratethegreater
effect an air leak can have on CO2readings.
F. DIRT—Afuellterisagoodinvestment.
Accidental accumulation of dirt in the fuel system
can clog the nozzle or nozzle strainer and produce a
poor spray pattern from the nozzle. The smaller the
ringrate,thesmallertheslotsbecomeinthenozzle
and the more prone to plugging it becomes with the
same amount of dirt.
G. WATER — Water in the fuel in large amounts will
stall the fuel pump. Water in the fuel in smaller
amounts will cause excessive wear on the pump,
but more importantly water doesn’t burn. It chills
theameandcausessmokeandunburnedfuelto
pass out of the combustion chamber and clog the
uewaysoftheboiler.
H. COLD OIL — If the oil temperature approaching
the fuel pump is 40°F or lower poor combustion or
delayed ignition may result. Cold oil is harder to
atomize at the nozzle. Thus, the spray droplets get
largerandtheameshapegetslonger.Anoutside
fuel tank that is above grade or has fuel lines in a
shallow bury is a good candidate for cold oil. The
best solution is to bury the tank and lines deep
enough to keep the oil above 40°F.
I. HIGH ALTITUDE INSTALLATIONS
Air settings must be increased at higher altitudes.
Use instruments and set for 11.5 to 12.5% CO2.
J. START-UP NOISE — Late ignition is the cause of
start-up noises. If it occurs recheck for electrode
settings,ameshape,airorwaterinthefuellines.
K.SHUTDOWNNOISE—Iftheamerunsoutof
air before it runs out of fuel, an after burn with noise
may occur. That may be the result of a faulty cut-off
valve in the fuel pump, or it may be air trapped in
thenozzleline.Itmaytakeseveralringcyclesfor
that air to be fully vented through the nozzle. Water
inthefuelorpoorameshapecanalsocauseshut
down noises.
TNATROPMI
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15. ATTENTION TO BOILER WHILE NOT IN
OPERATION.
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A. Spray inside surfaces with light lubricating or
crankcase oil using gun with extended stem so as to
reach all corners.
B. Always keep the manual fuel supply valve shut off
if the burner is shut down for an extended period of
time.
C. To recondition the heating system in the fall season
after a prolonged shut down, follow the instructions
outlined in Section III — Operating and Service
Instructions, Items 1 through 8.

19
SECTION IV: BOILER CLEANING
1. CLEAN THE FIRETUBES
A.Foraccesstoresideofboiler,pulltwohalvesof
Burner Swing Door Interlock wiring harness apart,
remove hex nuts holding door closed and open
swing door.
B. Prior to cleaning boiler, lay a protective cloth or
plastic over combustion chamber liner.
C. Using a 1 1/2" diameter wire brush (30" handle),
cleanretubes.Measure15"fromendofbrush
opposite handle, and mark handle. DO NOT allow
thismarktogopastfrontendofretubeduring
cleaning, or brush will hit rear door insulation peice.
2. CLEAN THE COMBUSTION CHAMBER
 Usingwireorberbristlebrush,cleaninsideof
combustion chamber. DO NOT let brush hit rear door
insulation piece or combustion chamber liner.
3. AFTER CLEANING
Vacuum debris inside bottom of rear door, remove
protectivecloth,andvacuumremainingresideof
boiler as necessary. BE CAREFUL not to damage liner
or rear door insulation piece. Inspect front and rear door
insulation pieces, front door gaskets and combustion
chamber liner for damage. Replace any damaged
pieces.
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4. CLOSE BOILER
CAUTION: Do not start burner unless burner swing door is
securely closed. Close door, install hex nuts, and tighten
securely. Door should be parallel to tubesheet when
viewed from top and sides. Reconnect two halves of
Swing Door Interlock.

20
V: REPAIR PARTS
Figure 17: microTEK3 Boiler Trim & Controls
All microTEK3™ Repair Parts can be ordered through New Yorker Boiler Co., Inc. or its authorized dis-
tributors.PleasecontactNewYorker'smainofceforclosestlocalsourceand/oranyadditionalinformation
regarding repair parts.
New Yorker Boiler Co., Inc.
P. O. Box 10
Hateld,Pennsylvania19440-0010
Phone: [phone]
Attn: Customer Service Department
Item Description Qty. Part Number
1Honeywell L7248C1014 High Limit & Circulator Relay --OR--
Honeywell L4080B1261 High Limit 1100059-01 80160402
2Honeywell 123871A, 3/4 NPT x 3 1 80160452
3Conbraco 10-408-05, 3/4 FPT, 30 PSI Relief Valve 1 81660319
4Temperature/Pressure Gauge 2-1/2 DIA (Long Shank) 1 8056164U
5Conbraco 35-302-03, 3/4 FPT Drain Valve 1 806603061
6Beckett R7184 Oil Primary Control 1 80160847
7 Burner Disconnect Harness 1 8133302
8Strain Relief Bushing (Not Shown) 1 8136029