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FREQUENTLY USED TEST POINTS FOR INTERFACE BOARDS 806-3398 AND 106-0386
Meter
Test Setting Pins Results
12VAC Power to Controller 50VAC Scale 1 and 3 on J3 or J2 12-18
24VAC Power to Right Module 50VAC Scale 8 on J3 and GROUND 22-28
24VAC Power to Left Module (if present) 50VAC Scale 8 on J1 and GROUND 22-28
120 VAC Power 250VAC Scale 11 on J3 and GROUND 110-125
120 VAC Power to Blowers 250VAC Scale 12 on J3 and GROUND 110-125
24VAC Power to Full- or Right-vat High-Limit 50VAC Scale 9 on J3 and GROUND 22-28
24VAC Power to Left High-Limit (if present) 50VAC Scale 9 on J1 and GROUND 22-28
Probe Resistance (Full- or Right-vat) *
R x 1000 OHMS 2 and 6 on J3 or 13 and 14 on J2 **
Probe Resistance (Left - if present) * R x 1000 OHMS 2 and 6 on J1 or 14 and 15 on J2 **
Probe Isolation R x 1000 OHMS 6 on J1 or J3 and GROUND ***
High-Limit Continuity (Full- or Right-vat) R x 1 OHM 9 on J3 and Wire 13C on Gas Valve 0
High-Limit Continuity (Left - if present) R x 1 OHM 9 on J1 and Wire 12C on Gas Valve 0
** Disconnect 15-pin harness from controller before testing probe circuit.
** See Probe Resistance Chart at end of chapter.
*** 5 mega-Ohms or greater.
These standard interface boards are also used in a number of fryer types besides the H50 Series. The
information contained in this section applies to H50 Series applications ONLY.
Earlier design 806-3398 boards (used from June 1996 through July 1999) contain two heat relays
(K1 and K2) that switch 24VAC to the ignition and gas valve circuits when the computer/controller
heat logic circuit calls for heat. Relay K4 switches 120VAC to the blower motor when either K1 or
K2 closes. The relays on these boards are soldered on – if one fails, the whole board must be
replaced.
The later design 806-3398 (and 106-0386 boards that replaced them in current production fryers)
have only two relays. In this design, K2 and K3 are double-pole-double throw (dpdt) relays that
supply 24VAC to the ignition and gas valve circuits, as well as 120VAC to the blower motor. The
relays on this board plug into sockets. If a relay fails, that relay can be replaced.
The tables below identify the diagnostic LEDs and their meaning.
12V
Indicates 12 VAC from transformer
24V
Indicates 24 VAC from transformer
GV
Indicates 24 VAC to gas valve (left or right)
PWR
Indicates 24 VAC to module (left or right)
AL
Indicates module lock-out (left or right)
AIR
CE and Japanese units only: air switch closed
EARLIER DESIGN INTERFACE BOARD
LED DIAGNOSTIC LIGHTS
D1
24 VAC to left gas valve (dual vat only)
D2
24 VAC to left ignition module
D3
24 VAC from transformer
D4
24 VAC to right ignition module
D5
24 VAC to gas valve (right valve if dual vat)
D6
12 VAC from transformer
D7
CE and Japanese units only: air switch closed
LATER DESIGN INTERFACE BOARD
LED DIAGNOSTIC LIGHTS