Thermostats; Accessing Fryers For Servicing - Frymaster Enodis BIPH52 Series Service Manual

FREQUENTLY USED TEST POINTS FOR INTERFACE BOARD 106-0386SP
Test
12VAC Power to Controller
24VAC Power to Right Module
120 VAC Power
120 VAC Power to Blowers
24VAC Power to Full- or Right-vat High-Limit
24VAC Power to Left High-Limit (if present)
Probe Resistance (Full- or Right-vat) *
Probe Resistance (Left - if present) *
Probe Isolation
High-Limit Continuity (Full- or Right-vat)
High-Limit Continuity (Left - if present)
** Disconnect 15-pin harness from controller before testing probe circuit.
** See Probe Resistance Chart at end of chapter.
*** 5 mega-Ohms or greater.

1.1.3 THERMOSTATS

BIPH52/55 and MPH52/55 Series gas fryers have temperature probes located on the front centerline
of each frypot (dual-vat frypots have two probes, one in each vat).
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 burner firing when the resistance exceeds or falls below programmed
temperatures (setpoints). The temperatures are programmed by means of a keypad on the face of the
controller.
BIPH52/55 and MPH52/55 Series fryers are also equipped with a high-limit thermostat. In the event
that 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 thermostats have different part numbers for CE and Non-CE models, and are not
interchangeable.
1.2

Accessing Fryers for Servicing

Moving a fryer filled with oil may cause spilling or splattering of the hot liquid.
Follow the draining instructions in Chapter 4 of the BIPH52/55-MPH52/55 Installation
and Operation manual (P/N 819-6087) before attempting to relocate a fryer for
1. Shut off the gas supply to the unit. Unplug the power cords. Disconnect the unit from the gas
supply.
Meter
Setting
50VAC Scale 1 and 3 on J3 or J2
50VAC Scale 8 on J3 and GROUND
250VAC Scale 11 on J3 and GROUND
250VAC Scale 12 on J3 and GROUND
50VAC Scale 9 on J3 and GROUND
50VAC Scale 9 on J1 and GROUND
R x 1000 OHMS 2 and 6 on J3 or 13 and 14 on J2
R x 1000 OHMS 2 and 6 on J1 or 14 and 15 on J2
R x 1000 OHMS 6 on J1 or J3 and GROUND
R x 1 OHM 9 on J3 and Wire 13C on Gas Valve
R x 1 OHM 9 on J1 and Wire 12C on Gas Valve
DANGER
servicing.
1-4
Pins Results
12-18
22-28
110-125
110-125
22-28
22-28
**
**
***
0
0
In this type of thermostat, the