Frymaster H50 Series Service And Parts Manual page 9

FREQUENTLY USED TEST POINTS FOR INTERFACE BOARDS 806-3398 AND 106-0386
Test
12VAC Power to Controller
24VAC Power to Right Module
24VAC Power to Left Module (if present)
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.
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.
EARLIER DESIGN INTERFACE BOARD
LED DIAGNOSTIC LIGHTS
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
Meter
Setting
50VAC Scale 1 and 3 on J3 or J2
50VAC Scale 8 on J3 and GROUND
50VAC Scale 8 on J1 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
LATER 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
1-3
Pins Results
12-18
22-28
22-28
110-125
110-125
22-28
22-28
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