Midco F400B-33 - Manual (Page 9)

CONSUMER INSTRUCTIONS
MAINTENANCE
■ ■ Keep the area around the burner clear and free of
combustible material, gasoline or other flammable liquids or
vapors. Do not obstruct burner air openings or ventilation grilles
for combustion air.
■ ■ The motor features permanently lubricated ball bearings and
requires no routing oiling maintenance.
CAUTION: 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.
An improper flame which is too lean will appear short and
all blue or purple. Burner cleaning and/or readjustment
may be indicated by flames that are too rich or too lean.
WARNING: If any flame is observed when the burner is
on standby, or if the ignition spark 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 OR
REPAIR.
■ ■ Check that the pilot ignition spark does not come on before
the motor reaches operating speed. If it does, the motor
interlock switch is defective and must be replaced. (See
Section X, Motor, Blower Interlock and Centrifugal Actuator).
LIGHTING INSTRUCTIONS
See Figure 7.
1.
SET OPERATING CONTROL TO OFF OR
THERMOSTAT BELOW ROOM TEMPERATURE.
2. TURN MANUAL GAS COCK KNOB ON
COMBINATION VALVE TO ON.
3. TURN BURNER POWER ON.
4. SET OPERATING CONTROL TO ON OR
THERMOSTAT TO CALL FOR HEAT.
5. IF THE PILOT FLAME IS NOT PROVEN WITHIN 15
SECONDS THE ELECTRONIC CONTROL WILL
SHUT OFF COMBINATION VALVE AND LOCK OUT.
IF THE PROOF OF FLAME IS LOST DURING
BURNER RUN AND THE PILOT IS NOT
REESTABLISHED WITHIN15 SECONDS AFTER 30-
SECOND PRE-PURGE, THE ELECTRONIC
CONTROL WILL SHUT OFF COMBINATION VALVE
AND LOCKOUT. TO RESET FOR RESTART, DE-
ENERGIZE THE CONTROL BY SETTING THE
OPERATING CONTROL TO OFF OR THERMOSTAT
BELOW ROOM TEMPERATURE FOR AT LEAST 60
SECONDS.
6. REPEAT STEP 4 FOR RESTART.
TO SHUT OFF
1.
TURN MANUAL GAS COCK KNOB ON
COMBINATION VALVE TO OFF.
2. TURN BURNER POWER OFF.
SHOULD OVERHEATING OF THE APPLIANCE OCCUR
1.
Shut off the manual gas control to the appliance.
2. Do not shut off the control switch to the pump or blower.
WARNING: IF PROPANE GAS IS USED AND THE BURNER IS LOCATED IN A BASEMENT, CRAWL SPACE OR
CONFINING SPACE, CONTACT YOUR 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.
TROUBLE CHART
Make sure the 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 BELOW.
I. MOTOR WILL NOT RUN
A.
Confirm 120V between strip terminals L1 and
L2 and verify the circuit polarity and electrical
ground between strip terminal L1 and burner
Ground.
B. Check for 120V between strip terminals L1 and L2.
1. No voltage, open circuit in operating controls.
2. No voltage, motor relay is defective.
3. Voltage present, motor is defective.
II. MOTOR RUNS CONTINUOUSLY, BUT NO FLAME
A.
Confirm that both Main Manual Shut-Off and
Combination Gas Shut-Off Valves are in the
ON position.
B. After 30 second pre-purge, if the pilot flame is
not proven within 15 seconds, or if the proof of
flame is lost during the burner run and the pilot
is not re-established within 15 seconds, the
Electronic Control will lock out. To reset the
control for restart, de-energize the Electronic
Control by setting the operating control to OFF
or thermostat below room temperature for at
least 60 seconds.
C. Clogged pilot orifice.
D. Pilot regulator misadjusted or defective.
E. Defective spark electrode or ignition control.
F. Defective high tension wire.
G. Wrong pilot orifice.
H. Defective pilot valve.
I. Pilot air tube clogged.
J. Incorrect spark gap.
K. Pilot regulator vent clogged.
III. MOTOR RUNS, PILOT WILL NOT LIGHT, FLAME
SAFEGUARD REMAINS "SET".
A.
Defective centrifugal actuator.
B. Defective blower interlock switch.
C. Slow motor.
D. Defective ignition control.
IV. PILOT LIGHTS, NO MAIN FLAME, RELAY LOCKS
OUT
A.
Poor pilot flame adjustment.
B. Clogged pilot air tube.
C. Defective flame rod or wire.
D. Flame rod mislocated.
E. Spark interference.
F. Pilot regulator vent clogged.
G. Defective ignition control.
V. PILOT LIGHTS, NO MAIN FLAME, RELAY REMAINS
"SET".
A.
Defective main gas valve.
B. Closed leak test cock.
C. Low gas pressure.
D. Grossly misadjusted main gas and air.
E. Defective ignition control.
VI. SPASMODIC START
A. Loose wiring.
*Normal Low Voltage: Burner on standby-24V min.
Burner running (Main Gas Valve
energized)-21V min.
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