Midco E20BP User Manual

INSTALLATION AND
SERVICE INSTRUCTIONS

ANSI Z21.17

CONVERSION

ECONOMITE
MODELS E20B & E20BP

Gas Conversion Burner

The ECONOMITE Models E20B and E20BP conversion burners are adaptable to most common central heating plants
including up-draft gravity and forced circulation furnaces and boilers. Power burner design makes it perfectly suited for oil burner
replacement. For horizontal and downdraft gas utilization equipment, ECONOMITE Model DS24A conversion burner with direct
spark ignition is recommended.

In the United States, installation must conform with local codes or,

in the absence of local codes, with Installation of Domestic Gas

Conversion Burners, ANSI Z21.8 latest edition and National
Fuel Gas Code, ANSI Z223.1 latest edition available from

American National Standard Institute. Further reference should
be made to the recommendation of your fuel supplier.

NOTE: Any additions, changes, or conversions required in order

for the burner to satisfactorily meet the application needs must be
made by a MIDCO distributor (or other qualified agency) using
factory specified and approved parts.

In Canada, installation must conform with local codes or, in the

absence of local codes, with Installation Codes for Gas

Burning Appliances and Equipment, CGA Standard
CAN/CGA 1-B149.1 or 2. When the conversion burner is used

on a Forced Air Central Furnace, the two yellow and black
warning labels in the literature envelope shall be attached in
accordance with Installation Code, CGA Standard CAN/CGA
1-B149, Clause 5.4.4.4. Further reference should be made to
the recommendation of your fuel supplier.

INSTALLER: Inform and demonstrate to

the user the correct operation and
maintenance of the burner. Inform the
user of the hazards of storing
flammable liquids and vapors in the
vicinity of this gas utilization
equipment and remove such hazards.
Affix this manual adjacent to the
conversion burner. CODE COMPLIANCE
IS THE SOLE RESPONSIBILITY OF
THE INSTALLER.

USER: Retain this manual for future reference. If other than routine service or

maintenance as described in this manual is required, contact a qualified service
agency. DO NOT ATTEMPT REPAIRS. An inadvertent service error could result
in a dangerous condition.

SAFETY INFORMATION TERMS: The following terms are used to identify hazards, safety precautions or special notations and
have standard meanings throughout this manual. When you see the safety alert symbol and one of the safety information terms,
as shown below, be aware of the hazard potential.

DANGER: Identifies the most serious hazards which will result in severe personal injury or death.
WARNING: Signifies a hazard that could result in personal injury or death.
CAUTION: Identifies unsafe practices which would result in minor personal injury or product and property damage.

BURNERS

WARNING: If the information in

these instructions is not followed
exactly, a fire or explosion may
result, causing property damage,
personal injury or death.

Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

● Do not try to light any appliance.

● Do not touch any electrical switch;

do not use any phone in your
building.

● Immediately call your gas supplier

from a neighborÕs phone. Follow
the gas supplierÕs instructions.

● If you cannot reach your gas

supplier, call the fire department.

Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.

MIDCO International Inc.

4140 WEST VICTORIA STREET ¥ CHICAGO, ILLINOIS 60646 ¥ [phone] FAX: [phone] ¥ http://www.midco-intl.com

PRINTED IN U.S.A.

8470-78

297

SPECIFICATIONS

Model E20B -- NATURAL Gas Only
Model E20BP -- PROPANE Gas*

AIR DELIVERY (Approximate Air

Delivery at Zero Draft)................................. 47 SCFM**

MAXIMUM FIRING RATE***.............................225 MBH****

MINIMUM FIRING RATE***................................50 MBH****

TUBE DIAMETER....................................................4 inches

TUBE LENGTH........................................................8 inches

MINIMUM COMBUSTION CHAMBER SIZE

225 MBH.......................................7" W x 11" L or 10" dia.

150 MBH.........................................6" W x 10" L or 9" dia.

GAS PRESSURE REQUIRED:

NATURAL and PROPANE....................5.0" to 14.0" W.C.

STANDARD VOLTAGE....................120 volts..........60 cycle

PILOT SAFETY......................Thermoelectric, 100% shut-off

* Model E20BP is equipped with a Redundant Main
Automatic Valve.
** SCFM = Standard Cubic Feet/Minute
*** Ratings based on 1000 BTU/cu. ft. NATURAL, 2500

BTU/cu. ft. PROPANE at Sea Level.

**** 1 MBH = 1,000 BTU/hr.

One gallon of fuel oil = 140,000 BTU.

Derate burner for altitudes over 2,000 feet by 4% for each
1,000 feet of addition elevation

PART 1 INSTALLATION

CAUTION: The ECONOMITE E20B(P) is not in­tended for outdoor installation and must be protect­ed from excessive moisture. Provide adequate

clearance for service and proper operation.

I VENTILATION

If the former automatic oil burner gave trouble-free operation, it
is probable that the gas utilization equipment area has
sufficient infiltration of air for combustion and dilution of flue
gases. Nevertheless, the area must be checked.

■ Open basement or utility areas of normal construction,

without storm windows or tight doors, will generally allow
sufficient air infiltration. However, if the gas utilization
equipment is located in a tight or separate room, ventilation to
an open area as described above will be required. Install two
permanently open grilles, each sized on the basis of one
square inch free area per 1,000 BTU (but not less than 100
square inches) of the total input rating of all gas utilization
equipment in the confined space. One grille should be located
within 12 inches of the ceiling, the other within 12 inches of the
floor.

■ If the gas utilization equipment is located in an area of

unusually tight construction, or if an exhaust fan, kitchen
ventilation system, clothes dryer and/or fireplace is installed in
the building, provision must be made for an outside air supply
near the gas utilization equipment area. Install permanently
open grilles sized at not less than one square inch free area
per 4,000 BTU of total input. When ventilating through
horizontal ducts, grilles should be sized at not less than one
square inch free area per 2,000 BTU of the total input rating of
all gas utilization equipment. In the confined space in any case,
the minimum dimension of
less than 3 inches.

■ In Canada, for detailed ventilation requirements, refer to

standard CAN/CGA 1-B149.1 or .2 and/or local codes.

rectangular air ducts shall not be

II PREPARATION OF THE

HEATING APPLIANCE

■ Clean the heating appliance, heat exchanger interior,

combustion chamber and flue connections. Remove all
adhering tars, scale, dirt and soot. Inspect for actual or potential
leaks.

■ Cement all joints, including those in the heating appliance

base and around the door frames, to prevent leakage into, or
out of the combustion chamber.

■ The access or firing door should open easily to relieve

pressure. If positive latches exist, they should be modified to
permit easy opening; a spring loaded door holder is
recommended.

■ On all boilers, make certain the pressure relief safety valve is

in good operating condition.

III COMBUSTION CHAMBER

A combustion chamber liner is normally required to protect
non-heat transfer surfaces and to provide a radiant bed for
rapid heat transfer to the primary surfaces of the heat
exchanger. In most cases an existing oil burner combustion
chamber liner can be used, if in good condition.

■ In the case of wet base boilers, where the entire firing

chamber is comprised of heat exchange surfaces and no
chamber liner was provided for oil firing, a liner is usually not
required for the ECONOMITE. However, a liner or target wall
may be necessary if the firing chamber is unusually short, in
order to avoid excess flame contact on the heat exchanger
walls or flueways.

■ If a built up chamber liner is required, use 2,300

insulating material.

■ The burner tube, or the stainless steel sleeve that is included

with the burner, must be sealed air tight into the combustion
chamber liner opening with refractory material as shown by
Figures 1 and 2. The sleeve is preferred as it is designed to
properly locate the end of the tube relative to the inside wall of
the combustion chamber, and to permit burner removal without
breaking the seal.

FIGURE 1 Dry Base Boiler with Combustion Chamber

Liner (Furnace Construction is Similar)

-2-

o

F minimum

FIGURE 2 Wet Base Boiler with Unlined

Combustion Chamber

CAUTION: In no case should the burner tube be
allowed to extend into the chamber proper; it must be set at
least 1" short of the inside surface.

■ Special heat resistant alloy extension tubes and instructions

are available for those applications where the burner tube is too
short to reach the combustion chamber (such as old-fashioned
gravity warm air furnace installations).

WARNING: BURNER CABINET MUST BE MOUNTED IN
ORIENTATION SHOWN IN FIGURES 1 AND 2. ANY OTHER
MOUNTINGS MAY CAUSE A DANGEROUS CONDITION,
AND WILL VOID BURNER WARRANTY AND AGENCY
APPROVALS. NON-STANDARD ARRANGEMENTS MAY BE
AVAILABLE FOR SOME MODELS - CONSULT FACTORY
FOR DETAILS IF REQUIRED.

■ Before permanently setting the burner in place, check that the

nozzle ribbon and pilot assembly are free of foreign materials,
and also that the spark electrode assembly has not been
damaged or displaced. See Figure 6.

■ The length of horizontal uninsulated Vent Connector

between chimney and a single gas utilization equipment shall
not exceed 75% of the height of the chimney above the
connector, or 100% if the Vent Connector is insulated.

■ The Vent Connector shall be installed so as to avoid turns or

other construction features which create excessive resistance
to flow of vent gas. It shall be installed without any dips or
sags and shall slope upward at least 1/4" per foot.

■ A manually operated damper shall not be placed in the Vent

Connector or chimney of any gas utilization equipment.

■ The Vent Connector shall be firmly attached to draft hood

outlets and flue collars. Joints between sections of connector
piping shall be fastened by sheet-metal screws or other
approved means. The Vent Connector shall be supported for
the design and weight of the material employed to maintain
clearance and prevent physical damage and separation of
joints.

■ A draft hood or a barometric draft regulator shall be installed

in the same room or enclosure as the equipment in such a
manner as to prevent any difference in the pressure between
the hood or regulator and the combustion air supply. In no
case shall the relief opening of the draft hood or barometric
draft regulator be located at a point lower than the top of the
highest flue passage in the equipment.

■ Gas utilization equipment requiring controlled draft may be

equipped with a listed double acting barometric draft regulator,
installed and adjusted in accordance with the manufacturerÕs
instructions, if approved by Local Codes.

■ A device which will automatically shut off gas to the burner

in the event of sustained backdraft is required. It shall be of the
listed manual reset type and installed and adjusted by a
qualified service technician in accordance with the
manufacturerÕs instructions.

IV CHIMNEY, VENT CONNECTOR AND

DRAFT CONTROL

WARNING: The chimney shall be inspected for unsafe
conditions such as deteriorated masonry and excessive
soot or other blockage or potential blockage. Installation
must conform with local codes or in the absence of local
codes with ANSI Z21.8 latest edition and NFPA, ANSI Z223.1

latest edition.

Maximum Firing Rate

100 MBH

143 MBH

195 MBH

225 MBH

TABLE 1 Recommended Vent Pipe Sizes

WARNING: THE VENT CONNECTOR SHALL NOT BE

CONNECTED TO A CHIMNEY ALREADY VENTING SOLID
FUEL BURNING EQUIPMENT, AN INCINERATOR OR AN
OPEN FIREPLACE.

■ The Vent Connector shall be made of non-combustible,

corrosion resistant material capable of withstanding the vent gas
temperature produced by the gas utilization equipment and of
sufficient thickness to withstand physical damage.

■ The Vent Connector shall be as short as possible. The

entire length shall be readily accessible for inspection, cleaning
and replacement.

Vent Pipe Diameter

5"

6"

7"

8"

FIGURE 3 Draft Hoods

FIGURE 4: Barometric Dampers

Figure 3 and 4: Copyright by the American Gas

Association. Used by permission of the copyright holder.

-3-

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CAUTION: Do not add any power consuming devices in the low voltage circuit as overloading of the transformer

can result. Do not use Motor Relay to operate any external devices as overloading of motor relay contacts can result.

NOTE: If any of the original wiring as supplied with the conversion burner must be replaced, it must be replaced with type TFF wire or
its equivalent.

V ELECTRICAL

FIGURE 5. Wiring Diagram

■ Provide a sediment trap, union and 1/8" pressure tap in

piping close to burner as shown in Figure 5.

Installation wiring and grounding of the burner must
conform to local codes or, in their absence in the United
States to National Electric Code, ANSI/NFPA No. 70
latest edition; in Canada, to Canadian Electrical Code

Part 1, CSA Standard C22.1.

■ Use 14 gage copper wire, for line voltage wiring. Be

sure to hook up to a permanently live circuit. Provide a
fused on-off disconnect switch carrying a minimum 3
amp fuse.

■ The frame of the burner should be well grounded. A

terminal is provided on the terminal strip for positive
grounding where insulated pipe couplings are used or
where any doubt exists regarding grounding sufficiency.

■ Confirm that the polarity is correct -- hot wire to strip

terminal 1, neutral 2 and that the neutral line is not subject
to induced low voltage (check 2 to ground) from other
equipment .

■ Each installation must include suitable limit controls.

Existing oil burner combination limit and operating controls
containing cad cells.are NOT SUITABLE for gas burner
use.

■ Set the thermostat heat anticipator for total current draw

handled by the thermostat. The current draw of the
Economite 24V operating circuit is 0.3 amp on E20B
(NATURAL) and 0.7 amp on E20BP (PROPANE). Setting
may have to be increased on steam or gravity systems.

CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.

VI PIPING

CAUTION: The available gas pressure should be
within the limits shown in SPECIFICATIONS section.
If the supply pressure exceeds the 14.0" W.C.
maximum, a suitable intermediate main regulator rated

■ Use pipe joint compound resistant to Liquid Petroleum

Gases.

■ Piping must also comply with local codes.

■ To obtain the maximum firing rate of 225 MBH, the

NATURAL and PROPANE gas supply piping must be sized
to provide a minimum of 5.0" W.C. pressure to the inlet of the
combination valve when the burner and all other gas
appliances are on.

CAUTION: Because it is difficult to accurately con­trol pressure during supply pipe leak test, it is recom­mend that the Combination Valve be disconnected. Ex­posing the Combination Valve to pressures over 1/2
PSIG will damage the valve and void its warranty.

DANGER: Explosion hazard. Do not use oxygen for
pressure testing. An explosion could occur during initial
start-up.

■ If the burner piping must be rearranged because of space

limitations, be sure to carry out the general arrangement
shown in Figure 5. Install the combination valve in any
position except up-side down.

■ When the burner is installed in the vestibule of equipment,

it is recommended that the combination valve be left
adjacent to the Burner within the vestibule and the Main
Manual Shut-Off Valve be installed outside.

APPROX. CAPACITY - MBH
PIPE
SIZE

1/2

3/4

1

11/4

TYPE

OF GAS

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

LENGTH OF PIPE

20

10

90

130

145

200

190

225

225

40

60

100

130

205

225

60

50

80

105

165

195

100

60

80

125

150

225

225

for main and pilot loads must be installed ahead of the
main manual shut-off valve shown in Figure 5.

■ The burner gas supply piping should branch off from the

main line as close to the gas meter as possible. Do not
connect to the bottom of a horizontal section. Use new
black pipe and malleable fittings free of cutting and
threading burrs or defects.

Capacities shown are for a total pressure drop of 0.3"
W.C. For a higher permissible pressure drops, consult
your fuel supplier. Source, Gas Engineering Handbook ­1974

-4-

TABLE 2 Supply Pipe Capacities in MBH

VII MAIN GAS SPUD

Standard burners are approved for use with NATURAL or
PROPANE gas only, and should be used only with the gas
specified on the rating plate.

WARNING: The Model E20B is not suitable for con­version to PROPANE gas. Using PROPANE gas in the
Model E20B may create a safety hazard and will void the
approval agency listings and the burner warranty. The
E20BP must be used for propane gas.

*Main Gas Spud Orifice Size, approximate Manifold Pressure
and Air Shutter setting as shipped.

Data shown is approximate and based on ÒOÓ overfire pressure
at sea level.

TABLE 3 Main Gas Spud Capacity and

Preliminary Gas and Air Settings.

AIR

FIGURE 5 Piping Connections

■ A standard E20B ECONOMITE (NATURAL) gas burner is

shipped with a .218 diameter orifice installed, the E20BP
ECONOMITE (PROPANE) a .180 diameter orifice installed for
an input capacity range of approximately 105 to 150 MBH
Spare spuds are included in a spare spud bag (stamped with
inch diameter) for other capacity ranges (see Table 3).

■ The combination valve pressure regulator is set to provide

2.0"W.C. manifold gas pressure for minimum spud input and
the blower air shutter is set for a maximum spud input, 32
turns from full closed, so as to provide a lean gas/air mixture
for initial start up.

■ If the required firing rate does not fall within the range of the

installed spud, select the correct capacity range from Table 3
and the spud with the correct orifice size (stamped with inch
diameter) from the spare spud bag. If the required firing rate is
at the minimum of a capacity range, select the next lower
range spud.

■ To change the main spud, turn off the Main Manual

Shut-Off Valve and burner power, remove the backplate,
disconnect the factory installed union located between the
combination valve and manifold slide plate and pull out the
curved manifold pipe. Unscrew the installed main spud from
the end of the curved manifold pipe and install the selected
main spud, making sure to reuse the fiber spud gasket.
Reassemble burner in reverse order.

WARNING: When reinstalling the curved manifold
pipe, make sure the manifold slide plate is positioned in
its holder and that the main spud is inserted into the end
of the nozzle. Refer to Figures 5 and 6. Reconnect union

and replace backplate.

WARNING: Reposition the air shutter for the

maximum firing rate of the selected spud capacity range.

Do not change the combination gas valve pressure regulator
setting at this time.

CAUTION: The approximate air and gas settings
described above are for initial start up only. Final settings
must be made in accordance with Section VIII. Instructions
for adjustment of the manifold gas pressure are detailed in
Section XI.

VIII INITIAL START UP / ADJUSTMENT

1. Check the burner piping and valves for gas leaks by

applying a weak liquid soap solution to unions and joints

with the gas supply on. Leakage will be indicated by the

appearance of soap bubbles. Locate and correct all gas

leaks before proceeding.

WARNING: DO NOT USE OPEN FLAME.

2. Purging the air from the gas supply line at this step will

expedite the first light-off.

CAUTION: Purge outside the building. Do not

purge into the gas utilization equipmentÕs combustion

chamber.

3. To purge the heating appliance and chimney of any

accumulated gases, turn manual gas cock knob on the

combination valve to OFF, turn burner power on and set

the operating control to ON or thermostat to call for heat.

Let the blower run long enough to accomplish four air

changes but not less than five minutes.

4. CAUTION: Make sure that the capacity range of

the installed main spud and the air shutter setting

are suitable for capacity rating of the gas utilization

equipment. Refer to Section VII and Table 3.

5. Stop motor by setting operating control to OFF or

thermostat below room temperature.

6. Turn manual gas cock knob on the combination valve to

PILOT and depress completely, hold firm and light pilot by

depressing ignitor button several times. Pilot should light.

Pilot may be viewed through Peep Sight located in rating

plate (see Figure 5). Failure to light is probably due to air

in pilot gas line. Attempt several relights. Then, if

necessary, refer to Trouble Chart or Section IX to isolate

the problem.

WARNING: Repeated unsuccessful attempts to
light pilot will result in accumulated gases in gas
utilization equipment and chimney. To prevent
these gases from reaching an explosive level,
periodically purge the heating appliance and

-5-

chimney as described in Step 3 above.

8

7. With pilot lit, wait one minute; then release Manual Gas

Cock Knob on Combination Valve and turn to ON. If pilot
goes out when knob is released, turn to OFF then PILOT
and repeat purging and pilot lighting instructions detailed
above. Incorrect pilot flame gas pressure may prevent
proper heating of thermocouple causing the pilotstat
safety control to drop out. Refer to Section IX for pilot
adjustment.

8. Turn operating control to ON or set thermostat above

room temperature. Main flame should come on when the
motor reaches operating speed. If not, refer to Trouble
Chart. To make a preliminary setting of the burner input,
determine the manifold gas pressure required from Table
3 and adjust the combination valve pressure regulator
accordingly. See Section XI.

9. To determine the firing rate for NATURAL gas:
Accurately time test dial for the number of seconds for
one revolution and use the following formula. All other
gas utilization equipment must be off.

3600 x Test Dial Size x BTU Value
No. of Seconds for One Rev. Test Dial

Then divide by 1,000 for MBH value.

Example: 3600 x 1 x 1000

20

For PROPANE gas, consult your local supplier for method

to determine firing rate.

10. Readjust the air shutter to provide a quiet, soft flame

-- blue at the burner nozzle with well defined orange

= 180,000 BTU/Hr. = 1

= BTU/Hr.

PART 2 SERVICE

and yellow tips for NATURAL gas or with well defined
yellow tips for PROPANE gas.

11. Check the operation of the burner; start and stop it
several times with the thermostat or operating control.

12. With the burner running, check the operation of all limit
and associated controls.

13. PERFORM THE FOLLOWING FINAL ADJUSTMENTS
for combustion and flue gas temperature. Take the flue
gas samples and temperature immediately ahead of the
draft control.

A. Check the draft control to make sure there is no spillage

of flue products into the room.

B. Make the final setting of the air shutter by

checking the flue gases with an ORSAT or similar
combustion testing instrument. The carbon monoxide
content should conform to local codes, or, in their
absence to the level specified in the United States or
Canadian Standard reference on the front cover of
this manual; and the carbon dioxide content should
be approximately 9.5% for NATURAL and 12.1% for
PROPANE, or within the limits prescribed by the local
codes.

C. The flue gas temperature should be above 325¡F but

not exceeding 550¡F. Excessive flue gas temperatures
will result in low efficiencies. Low flue gas temperature
may cause excessive condensation.

14. FILL OUT THE INSTALLATION ADJUSTMENT DATA
TAG and affix to the burner or converted appliance

NOTE: For subsequent normal starting and shut off
procedure, refer to CONSUMER INSTRUCTIONS or
to the instruction plate mounted on the burner.

DANGER: Be sure the Main Manual Shut-Off Valve, Combination Valve and Burner Power Switch are

turned off before removing any parts for service.

WARNING: Do not attempt to FIRE the burner with the burner backplate removed as air from the blower

will not reach the combustion chamber and a dangerous level of unburned gas could accumulate.

IX NOZZLE AND PILOT

The nozzle and pilot assembly can be removed as a unit by
removing the back plate, disconnecting the factory installed
union located between combination valve and manifold slide
plate, and pulling out curved manifold pipe. Disconnect
thermocouple and pilot tube at Combination Gas Valve.
Withdraw nozzle assembly, enough to permit disconnecting
ignitor wire before removing nozzle and pilot assembly
completely.

■ When the pilot flame gas pressure is in the proper range,

lint, dust or corrosion is the usual cause for most service
problems. When servicing, clean the nozzle ribbon and pilot
assembly including the pilot orifice and electrode porcelain.

■ If cleaning does not eliminate a pilot outage problem, further

checks are required.

■ Check to verify that the burner nozzle is not installed in too

far. See Figures 1 and 2.

■ A continuous draft is required for the proper operation of the

pilot. This is no problem in the usual up-draft heating
appliance. However, in down-draft or horizontal appliances,

especially during periods of infrequent operation, the available
draft may become nil and result in the pilot products of
combustion being recirculated and snuffing out the pilot.
Excessive draft (over -.05" W.C.) or reverse draft may also
result in nuisance pilot outages. Where a suitable continuous
draft cannot be provided, a spark ignited burner should be
considered.

■ Check that the pilot orifice size is correct (refer to Table 4).

CAUTION: Do not indiscriminately increase pilot orifice
size. Pilot troubles are rarely cured in this manner and
new troubles may be introduced by causing the pilot flame
to float and lose contact with the thermocouple.

Nominal BTU/Hr. Value

NAT-1000 PROPANE-2500

Orifice Diameter .018 .012

Pilot Flame Gas Pressure 3.5 - 7.0" W.C.

Approx. Capacity 800 BTU/Hr.

TABLE 4 Pilot Specifications

.

FIGURE 6 Nozzle and Pilot Assembly

-6-

■ Check for high or low pilot gas pressure. Pilot gas pressure

tap is located in tee fitting in pilot gas line near bottom of back
plate. If over 7.0" W.C. with burner on, the size of pilot flame
should be reduced to increase heat on the thermocouple. Pilot
gas adjustment screw (needle valve) is located on the inlet end
of combination gas valve body and is factory set full open.
Remove plug for access and turn clockwise to reduce flow
(pressure).

CAUTION: If there is more than a 1.0"W.C. differential
between STANDBY inlet pressure when all appliances are
OFF, and the inlet pressure when the burner and all other
appliances are ON, a 1Ú8 inch Maxitrol RV12 (or equal)
pressure regulator must be installed in the pilot gas line.
With the adjustment screw wide open, set the pilot flame
gas pressure at 4.0"W.C. for NATURAL gas, 8.0"W.C. for
PROPANE.

■ Examine the thermocouple. If there is any serious corrosion

or loss of metal at the tip, replace the thermocouple.

■ The efficiency of the thermocouple and pilotstat safety

control of the combination valve can be determined by timing
the safety shut-off. With power to the burner shut off and with
the combustion chamber cool, allow the pilot to operate at
least five minutes. Then turn off the pilot and time the period
until a click is heard from the pilotstat safety control in the
Combination Valve. If less than 30 seconds or exceeds 3
minutes, the thermocouple, pilot flame adjustment or the
pilotstat safety control is faulty and the entire Combination
Valve must be replaced.

■ An accurate check of the thermocouple and pilot flame

adjustment can be made with a millivoltmeter. The
thermocouple, when heated by the pilot, should develop at
least 15 millivolts minimum to 25 millivolts maximum open
circuit (thermocouple disconnected from pilotstat safety control
of combination valve). If millivolt reading is above maximum,
readjust pilot gas input slightly to reduce voltage. Check
results with blower motor on and off.

■ Tests to isolate thermocouple and/or pilotstat safety control

problems can be conducted under closed circuit conditions
(thermocouple connected to valve through an adaptor that
provides for connecting the millivoltmeter). If the thermocouple
does not develop at least 7 millivolts when the pilot flame is
properly adjusted, it is defective. If the valve does not hold in
with 7 millivolts, the pilotstat safety control section is defective
and entire valve must be replaced.

■ If the thermocouple develops 15 millivolts minimum open

circuit and 7 millivolts minimum closed circuit but drop out
timing is under 30 seconds or exceeds 3 minutes, the pilotstat
safety control section is defective and entire valve must be
replaced.

WARNING: When reassembling burner, make sure
that the manifold slide plate is positioned in its holder and
that the main spud is inserted into the end of nozzle (see
Figures 5 and 6).

X BLOWER SHELF ASSEMBLY

The shelf assembly including the blower and motor, motor
relay, low voltage transformer and terminal board can be
withdrawn as a unit after the back plate is removed and
external wiring is disconnected.

■ Cleaning of the blower wheel is usually the only service

required. Need for cleaning is indicated if the air inlet slots in
the burner housing show an accumulation of dust and lint, or if
the character of the flame -- long, hazy and yellow (sooty) -­indicates a deficiency of air. Motor air cooling vents should
also be cleaned at this time.

■ If the motor must be replaced, remove the blower wheel

first and remove the retainer clips at the rubber motor
grommets, pull the motor out of keyhole brackets. Remount
in reverse order noting that brass flanges of rubber motor
mounts are located against motor. Do not omit the three
clips. Position blower wheel on motor shaft to provide 1/8
inch clearance between blower inlet opening and blower
wheel ring.

■ Shelf gaskets are installed on the inside of the back cover

and inside of the front of the burner cabinet. Be sure they are
in place when reinstalling the shelf assembly, otherwise
blower air will be lost and combustion could be affected.

XI COMBINATION GAS VALVE

The 24 volt combination valve serves five functions:

1. Main manual and pilot gas shut-off,

2. Manifold gas pressure regulation,

3. Pilot gas input adjustment,

4. Automatic electric main gas valve; single seated on
Model E20B, double seated (redundant) on E20BP
Models, and

5. Pilotstat safety control.

A pilot filter is also included.

■ For manual control the manual gas cock knob is turned full

ON or full OFF. The dial has to be depressed to be turned in
one direction, but it depends on the manufacturer of the valve
whether it is in the ON or OFF position.

■ Refer to Section IX for pilot adjustment.

■ The combination valve gas pressure regulator has an outlet

pressure setting range of 2.0" to 4.0" W.C. and is factory set
for 2.0" W.C. Manifold gas pressure tap is located on the
outlet end of the combination gas valve body.

■ If pressure adjustment is required for setting capacity,

remove regulator cap for access to slotted adjustment screw.
Turning of adjustment screw counterclockwise reduces
pressure; clockwise increases pressure. Do not adjust past
point where no change in pressure is noted.

NOTE: Pressure setting can only be made with burner run­ning and gas on.

CAUTION: If gas supply pressure is below its

specified range during adjustment, an overfire condition
could result when pressure returns to normal, particularly
if the regulator adjustment screw is bottomed out. AL­WAYS confirm that at least the minimum rated gas pres­sure is being supplied to the burner during regulator ad­justments, and NEVER bottom out regulator screw.

■ If the pressure regulator fails to maintain a constant

manifold gas pressure within +
pressure within the specified 5"-14" W.C., the regulator
section of the valve is defective and entire valve must be
replaced.

■ The pilotstat safety control may be suspect if frequent "pilot

outages" occur. Refer to Section IX to isolate the problem.

■ If, on a call for heat, the main burner fails to operate even

though the pilot is burning and the motor is running, failure of
the electric valve operator(s) may be indicated. Refer to the
TROUBLE CHART for further information.

■ If leakage through the valve occurs on standby, as

evidenced by the presence of any flame other than pilot, the
entire valve must be replaced.

CAUTION: If the combination valve has been moved

or replaced, soap bubble test for leaks with the burner
running.

0.1" W.C., with an inlet

-7-

CONSUMER INSTRUCTIONS

MAINTENANCE

Keep the area around the burner clear and free of
combustible materials, gasoline or other flammable liquids or
vapors. Do not obstruct burner air inlet slots or ventilation
grilles for combustion air.

■ The motor features permanently lubricated ball bearings

and requires no routine oiling.

IMPORTANT: Check the burner flame periodically. A proper
NATURAL gas flame will appear blue at the burner face with
orange and yellow tips. A proper PROPANE gas flame will
appear blue at the burner face with yellow tips. If the flame is
too rich, it will appear billowy and yellow with hazy tips. If too
lean, it will appear short and all blue. If the flame does not
appear proper, CONTACT A QUALIFIED SERVICE
TECHNICIAN FOR CLEANING , READJUSTMENT AND/OR
REPAIR

WARNING: If any flame is observed other than pilot
when the burner is on standby, or valve operator is heard
to come on before the motor reaches operating speed,
immediately turn off the manual gas control and burner
power. A dangerous condition has developed and must
be corrected. CONTACT A QUALIFIED SERVICE
TECHNICIAN FOR CLEANING, READJUSTMENT AND/OR
REPAIR.

WARNING: If PROPANE gas is used and the burner
is located in a basement, crawl space or confined space,
contact you gas supplier about installing a GAS LEAK
warning device. PROPANE gas is heavier than air and
can settle in low areas or confined spaces. This would
create a DANGER OF EXPLOSION OR FIRE. If you
suspect a gas leak, follow instructions on front cover of
this manual.

LIGHTING INSTRUCTIONS

1. TURN (DEPRESS) MANUAL GAS COCK KNOB ON

COMBINATION VALVE TO OFF.

2. TURN BURNER POWER ON. SET THERMOSTAT OR

OPERATING CONTROL TO CALL FOR HEAT. LET

MOTOR RUN 5 MINUTES. TO PURGE COMBUSTION
CHAMBER AND CHIMNEY.

3. SET OPERATING CONTROL TO OFF OR
THERMOSTAT BELOW ROOM TEMPERATURE

4. TURN MANUAL GAS COCK KNOB ON COMBINATION
VALVE TO PILOT. DEPRESS KNOB, OR RED
BUTTON IF SO EQUIPPED, AND HOLD.

5. PUSH IGNITOR BUTTON SEVERAL TIMES TO
LIGHT THE PILOT

6. AFTER ONE MINUTE, RELEASE MANUAL GAS COCK
KNOB ON COMBINATION VALVE, OR RED BUTTON
IF SO EQUIPPED, AND TURN TO ON.

7. ADJUST THERMOSTAT OR OPERATING CONTROL
TO DESIRED SETTING.

TO SHUT OFF

1. TURN (DEPRESS) MANUAL GAS COCK KNOB ON
COMBINATION VALVE TO OFF.

2. TURN BURNER POWER OFF.

SHOULD OVERHEATING OF

THE GAS UTILIZATION EQUIPMENT OCCUR:

1. Shut off the main manual shut-off valve to the appliance.

2. Do not shut off the power to the Economite burner,
the equipment pump, or blower.

TROUBLE CHART

Make sure thermostat and operating controls are calling for heat. Defective wiring or loose connections can simulate the component defects outlined

below. Check associated wiring before replacing a component. ELECTRICAL AND FLAME CHECKS MUST BE MADE IN THE ORDER LISTED.

I. PILOT WILL NOT LIGHT.

A. Manual gas cock knob on combination valve is not depressed in

the PILOT position.

B. Main Manual Shut-Off Valve is not in open position.
C. Air in pilot gas line (see Section VIII).
D. High or low pilot flame gas pressure (see Section IX).
E. Clogged pilot orifice(s) (see Section IX).
F. Defective ignitor, ignitor wires, spark rod or improper spark gap

(see Figure 6).

G. Excessively high negative or positive draft condition (see Section

I and Section IX).

II. PILOT GOES OUT FREQUENTLY.

A. Excessively high negative or positive draft condition (see Section

I and Section IX).
B. High or low pilot flame gas pressure (see Section IX).
C. Burner tube extends into combustion chamber (see Section III).
D. Lint or dust in pilot (see Section IX).
E. Clogged pilot orifice(s) (see Section IX).
F. Defective thermocouple (see Section IX).
G. Defective pilotstat safety control (see Section IX).
H. Clogged pilot filter in combination valve; entire valve must be

replaced.

III. MOTOR WILL NOT RUN.

A. Confirm 120V between strip terminals 1 and 2 and verify the

circuit polarity and electrical ground between strip terminals 1

and GND.(See Section V).
B. Check 24V* operating control circuit:

1. Between motor relay terminal 1 and left strip terminal T.

a. If no voltage, transformer is defective.

b. If very low voltage,* circuit is overloaded or transformer is defective.

2. Between motor relay terminal 1 and right strip terminal T.
a. If no voltage, circuit between strip terminals T and T is open.

C. Check for 120V between motor relay terminal 4 and strip

terminal 2.

1. If no voltage, motor relay is defective.

2. If voltage present, motor is defective or Blower Wheel is

binding.

IV. MOTOR RUNS IN REPEATED CYCLES -- NO FLAME PRESENT.

A. Motor relay drops out due to low voltage.* Check valve circuit

for ground or overload.

V. MOTOR RUNS CONTINUOUSLY. PILOT IS ON, BUT NO MAIN FLAME.

A. Manual gas cock knob on combination valve not in ON position.
B. Check for 24V between splice or valve TH and GND.

1. If no voltage, motor interlock switch is defective.

2. If voltage present, Electric Valve Operator(s) section of
Combination Valve is defective and entire valve must be
replaced.

VI. SHORT FLAME.**

A. Low manifold gas pressure.
B. Main gas spud orifice too small.
C. Air adjustment open too far.

VII. LONG, HAZY FLAME.**

A. High manifold gas pressure.
B. Main gas spud orifice too large.
C. Air adjustment closed too far.
D. Dirty blower wheel.

VIII. GAS FAILS TO SHUT OFF.

A. Electric valve operator(s) of Combination Valve is defective and

entire valve must be replaced.

* Normal low voltage: Burner in standby -- 24V min.
Burner running (gas valve energized) -- 21V min.

** CAUTION If changes are made in the main gas spud orifice

size, manifold gas pressure or primary air adjustment, change the
installation data tag accordingly.

-8-