Frymaster BIH52 Series Service Manual page 20

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
120 VAC Power
120 VAC Power to Blowers
24VAC Power to Right High-Limit
24VAC Power to Left High-Limit
Probe Resistance (Right) *
Probe Resistance (Left) *
Probe Isolation
High-Limit Continuity (Right)
High-Limit Continuity (Left)
** 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 H52 Series. The
information contained in this section applies to H52 Series applications ONLY.
The earlier design 806-3398 board contains 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 this board are
soldered on – if one fails, the whole board must be replaced.
The newer design 806-3398 and 106-0386 boards have one or 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.
All three interface boards have LEDs to assist in troubleshooting. On the earlier design 806-3398
board, nine LEDs are arranged along the bottom. Later versions of the 806-3398 board, and the 106-
0386 board have seven LEDs placed at various locations. The tables below identify the 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
1 24 VAC to left gas valve (dual vat only)
2 24 VAC to left ignition module
3 24 VAC from transformer
4 24 VAC to right ignition module
5 24 VAC to gas valve (right valve if dual vat)
6 12 VAC from transformer
7
CE and Japanese units only: air switch closed
3-3
Pins Results
110-125
110-125
LATER DESIGN INTERFACE BOARD
LED DIAGNOSTIC LIGHTS
12-18
22-28
22-28
22-28
22-28
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