Service Procedures And Adjustments; Temperature And Humidity Calibration; Reset Sensor Codes; Heater Element Test - Vulcan-Hart VHU Series Service Manual

VHU INSULATED HUMIDIFIED CABINETS - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

TEMPERATURE AND HUMIDITY
CALIBRATION
The oven and its parts are hot. Use
care when operating, cleaning or servicing the oven.
1. Check room temperature.
2. Place temperature and humidity probe at the
center of the cabinet.
3. Set unit temperature to 145°F.
4. Set relative humidity to 65%RH.
5. Wait 45 minutes.
6. The temperature setting should be between 138
- 152F° and relative humidity between 45%RH -
85%RH.
VERIFY
• When using cabinet, frequently opening the
door will affect average internal
temperature. Modify set temperature as
necessary to ensure product is held above
appropriate food safe temperature.

RESET SENSOR CODES

The oven and its parts are hot. Use
care when operating, cleaning or servicing the oven.
1. Reset unit (turn it off, then on).
2. Turn unit off and remove sensor cover.
NOTE: Sensor board is located inside cabinet at the
top of the cavity toward the front.
Fig. 1
3. Dry off sensor and wires.
F45642 (0217)
4. Disconnect sensor wire harness plugs and dry
out any moisture in connectors.
5. Plug sensor wire connectors into board.
6. Turn unit on to verify error code has cleared.
7. If error codes are not clear, replace both
SENSOR BOARD AND WIRE HARNESS.
8. Install sensor board cover.
9. Verify operation.

HEATER ELEMENT TEST

1. Access the heater element being tested.
• HUMIDITY ELEMENT (BELOW PAN)
• AIR ELEMENT
2. Check resistance using HEATING ELEMENT
table.
Model
VHU7
VHU18
Page 4 of 16
Fig. 2
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
Heating Elements
Wattage Voltage
1500
120
(Standard)
Resistance
8.80-10.27