Midco E20BP - Manual (Page 8)

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.
-8-
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.
CONSUMER INSTRUCTIONS