XLT XD-9006A (GAS Oven Version – C, AVI Hood Version – C) - Manual (Page 8)

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The first part of the Theory of Operation explains how electrical power is delivered to the
oven and initial sequences when the main operator switch is turned on. The remainder of the The-
ory of Operation section explains the function of components in alphabetical order. These compo-
nents are also listed on the schematic.
When the Main Switch (S1) is turned on;
1. The Oven Fan Motor (M1) located in the Back Wall will run.
2. The Fan (M3) located on the Control Panel will run.
3. The Temperature Control (TC) should display both the actual and set-point temperatures.
4. The Conveyor Control (CC) should display the belt time.
5. The burner will ignite.
6. The conveyor belt should move.
GAS OVEN THEORY OF OPERATION
 Line voltage for Standard Ovens is assumed to be 120 VAC, 60 Hz.
 Line voltage for World & Australian Ovens is assumed to be 230 VAC, 50 Hz.
Power originates at the electrical connection on the wall. Line voltage is then carried into
the oven through the power cord to the Terminal Strip (TS). The Neutral line is connected to the
TS, and several jumpers are used to bridge along the TS to make connection points for multiple
neutral lines from all components inside of the control box and Oven Fan Motor (M1). Line 1 is
also connected to the TS. From there, wires connect to Terminal T11 on the Cool Down Timer
(R1), the High Limit Switch (S3, World & Australian only), through the Main Circuit Breaker
(CB1), then to the Main Switch (S1). Unless the outlet on the wall has no power, the circuit just
described has power at all times.
When S1 is turned on, line voltage will be carried through the switch simultaneously to
four locations via two parallel circuits:
 Terminal T6 of the Cool Down Timer (R1)
 Terminal T5 of the Temperature Control (TC), via a Circuit Breaker (CB5)
And:
 Transformer (XFMR)
 Power Supply (PS)