Replacing Control Box Components (Smart Interface Board (Sib)), Transformer; Improper Temperature Control; Thermostats - Frymaster BIELA14-T Series Service Manual

1.7.7 Replacing Control Box Components
(Smart Interface Board (SIB), transformer, relay
1. Perform steps 1 through 8 from section 1.9.3.
2. Remove the bezel by removing the two (2) screws on the
bottom of the bezel.
3. Disconnect the cables attached to the component marking or
making a note of the connectors to facilitate reconnection.
4. Remove the connecting
component.
5. Remove the component from the box. If removing the board,
be careful not to lose spacers that fit over the studs behind the
board.
NOTE: If replacing a filter relay, ensure the 24VDC relay
(8074482) is used.
6. Reverse the procedure to install the replacement component. If replacing the SIB board, ensure the spacers behind
the board are in place and the controller locator wire is attached to a stud.
7. Reverse above steps to reassemble, complete the replacement and return the fryer to service.
1.8

Improper Temperature Control

Temperature control, including the melt cycle, is a function of several interrelated components, each of which must operate
correctly. The principle component is the temperature probe. Other components include the smart interface board (SIB),
the controller itself, heat and latch relays, contactors and the elements.
Improper temperature control problems can be categorized into melt cycle problems and failure to control at setpoint
problems.
MELT CYCLE PROBLEMS
Initiation of the melt cycle with M4000 controllers is automatic. Problems may originate from the controller itself, the
temperature probe, or a malfunctioning heat relay on the SIB (Smart Interface Board) or the SIB (Smart Interface Board).
FAILURE TO CONTROL AT SETPOINT
Problems in this category may be caused by the temperature probe, the SIB (Smart Interface Board), the controller, loss of
power to elements or the loss of a leg of power to the fryer.

1.8.1 Thermostats

The fryers are equipped with temperature probes located on each element (dual-vat frypots have two probes, one in each
vat). In this type of thermostat, the probe resistance varies directly with the temperature. That is, as the temperature rises,
so does resistance, at a rate of approximately 2 ohms for every 1º F. Circuitry in the controller monitors the probe
resistance and controls element heating when the resistance exceeds or falls below programmed temperatures (set
points).
The fryers are also equipped with a high-limit thermostat. If the fryer fails to properly control the oil temperature, the high-
limit thermostat prevents the fryer from overheating to the flash point. The high-limit thermostat acts as a normally closed
power switch that opens when exposed to temperatures above 425ºF to 450ºF (218ºC to 232ºC). The different types of high
limit thermostats have different part numbers for CE and Non-CE models, and are NOT interchangeable.
nuts or screws attaching the
1-12
Filter Relay (Left Box Only);
Reset Switch Relay (Right Box Only)
Figure 1
24 VAC (FIB)
Transformer
SIB
24 VAC (SIB)
Transformer