Frymaster LOV M3000 - Manual (Page 12)

LOV ™ Generation II Technical Reference
11
If oil is surrounding the heater, the oil will prevent the heater from ever reaching its setpoint. Once
oil is removed during fi ltration, the heater reaches setpoint and cycles a thermostat every four
seconds. Since the cycle is only four seconds long, the seven second delay is not made and the gas
valve won’t open.
The 120VAC is on T2 in the control box traveling in on pin 11 of J3 and out pin 7 on J1 (DV) or pin
7 on J3 (FV).
Typical sensor-related failures:
Low temp but no call for heat (heat light),
Stuck in melt cycle with no call for heat,
Filter error (
IS VAT FULL? IS VAT FULL?) with oil in the fi lter pan (no oil in the vat).
If the computer doesn’t exit melt cycle or continues to display low temp and does not heat,
ensure that the gas supply, gas valve, and other components are working properly. If no heat lamp
illuminates because no call for heat is initiated, check the following (see diagram below):
Power to oil sensor (from previous basket lift relay on interface board K1(DV) or K4 (FV)). Check
pin 7 on J1 (DV) or pin 7 on J3 (FV) for 120VAC.
Power to heater/relay coil on relay board. Check voltage to the coil on pins 8 and 1 to ensure that
120VAC is present with oil in the vat. If the vat is empty, the power will cycle 4 seconds on, 4
seconds off.
Check between pin 3 and 2; 5VDC for air and 0VDC for oil. A common message for a shorted
harness or issue is
IS DRAIN CLEAR? IS DRAIN CLEAR? with oil in the fi lter pan.
Check ground on pin 2 on relay board to stud for a secure ground.
Check AIF communication harness. Interrupted communication will prevent the fryer from
heating.
If the oil level sensor is cycling 4 sec. on/off and oil is surrounding the sensor, the sensor may have
a carbon build up that is self insulating the sensor. Use a no scratch pad to remove carbon build up.
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Line Voltage In From
Oil Level Sensor
(Basket Lift) Relay on
Interface Board
120V
Fixed Setpoint
Temp. Control
Thermocouple
Heater
(350 ohms US)
(1325 ohms Intl)
120V (US) 230V (Intl) 40W
Heater w/ Thermocouple
Time Delay Relay Board
DPDT 7sec. Delay on Make
8 1
2
3
7
6 To AIF Board J2 Pin 9 DV
or 10 FV (AIF Oil Signal)
24VAC from Interface Board
through High Limit (Ign. Module
Call for Heat)
To (optional Drain
Switch) and Gas
Valve
Red
Green
Black
Black
White Black
120V
Black
(To J1 Pin 7 (DV)
or J3 Pin 7 (FV))
White
(To T2 Terminal Block
5 4
C
NO
NC