Thermostat Adjustments - Vulcan-Hart 148L Service Manual

THERMOSTAT ADJUSTMENTS (Cont.)
CONVECTION (SNORKEL
TOOLS REQUIRED: Thermometer (not of bi-metal or mercury type), standard flat blade screwdriver.
WARNING: DO NOT USE BI-METAL OR MERCURY THERMOMETERS WHEN TESTING FOOD EQUIPMENT OR
PRODUCTS. CHEMICALS WITHIN THESE INSTRUMENTS MAY BE TOXIC IF EXPOSED TO FOOD.
1. Using a test instrument or thermometer, check oven temperature against thermostat dial setting.
Place the thermocouple of the test instrument on the center of the oven rack. Light main burner by turning thermostat
to 350 F (176.7 C).
2. Allow unit to heat until flame is heard cutting off. Open oven door and quickly obtain oven temperature reading. Allow
burner flame to cycle "ON" and "OFF" several more times. Check the oven temperature reading every 5 minutes until
a reading of within
3. Check successive reading against thermostat dial. If temperature reading is within
is correct; if not, follow calibration Steps 4 through 6.
4. Pull dial straight off dial shaft without turning shaft (see Fig. 17).
5. Place a screwdriver into thermostat dial shaft, engaging adjustment screw "A" (see Fig. 20).
6. Turn adjustment screw "A" clockwise to decrease temperature and counterclockwise to increase temperature
(Fig. 22).
NOTE: A quarter turn of screw "A" represents a temperature shift of 35 F (1.7 C).
"A"
7. Recheck the thermostat reading against the oven temperature. If a reading difference greater than 5 F (-15 C) is
still found, the thermostat must be replaced.
®
) OVEN (90 Series Only)
5 F in succession is obtained.
DIAL SHAFT
INCREASE
THERMOSTAT CALIBRATION
Fig. 22
— 22 —
15 F (9-44 C), the calibration
DECREASE
1/4 TURN = 35º F
PL-50119
"A"