Trouble Shooting - Vulcan-Hart RGT-10 Installation, Service & Parts Manual

TROUBLE-SHOOTING
The following is intended to provide a guide for trouble
shooting procedure and covers some of the more
common problems with the equipment. The servicing
personnel, as with any other equipment, need to become
familiar enough with the circuit and the components in
order to be able to follow a logical sequence of trouble-
shooting, and repair malfunctions not mentioned in the
following paragraphs.
The instruments necessary for trouble-shooting would be:
A. A.C. Voltmeter to measure line voltages up to
480 volt.
B. A.C. Ammeter to measure line currents
C. Accurate Thermometer or Potentiometer to
measure oven temperature up to 500 F.
PROBLEM
1. No blower, no heat.
2. The blower is "ON" (with aux. fan
switch de-energized) but no heat.
PROCEDURE
Depress the Oven Light push-button switch or turn timer knob to "0" position. If the
lights come On and the Buzzer sounds, follow step B. If not, follow step A.
Step A — Measure voltage between leads 93 and 94 (The supply side) of the
Master Switch.
If no voltage check connection to Power Supply Cord and verify power at wall
socket.
If 115 volt, measure voltage across 21 and 22.
If no voltage, the Master Switch is defective.
If 115 volt, check for bad connection from the switch terminal to the Thermostat
and motor connections.
Step B — Only the Door Switch can disconnect the Blower and heat at the same
time. While opening and closing the right hand door listen for a Click near the top
of the right hand door. If no Click, the door switch requires adjustment. If the
switch does Click but not heat or blower, the switch may be defective.
Turn thermostat knob to about 400 F. position. If oven signal light is turned "ON",
follow step A; if not, follow step B.
Step A. Oven indicator light is "ON." This is an indication that the door switch, the
flame switches, and the thermostat are functioning properly. The problem can then
be related to the load control switch or the solenoid.
Turn the load control knob to "HI" position.
Check the voltage between terminals L1 and L2 of the load control switch.
If no volt, check for bad connection or faulty lead to the switch.
In the following paragraphs, the voltmeter is used to
measure the voltage between 2 phases on 208, 240, 480
volt and between one phase and neutral on 220/380 and
240/415 volt supplies. Do not measure the voltage with
respect to the chassis around. For the sake of simplicity,
the measured voltage is referred to 115 volt, assuming
that the supply is 115 volt. When supply is 208 or 240, the
measured voltage should also be 208 or 240 — it is also
assumed that the voltage rating of the over matches
exactly (within the allowable supply tolerance) that of the
field supply. Refer to the appropriate wiring diagram at the
end of this booklet for reference.
With the main power and oven circuit breakers "ON"
position and the oven door closed:
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