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3-3
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 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 Right High-Limit 50VAC Scale 9 on J3 and GROUND 22-28
24VAC Power to Left High-Limit 50VAC Scale 9 on J1 and GROUND 22-28
Probe Resistance (Right) *
R x 1000 OHMS 2 and 6 on J3 or 13 and 14 on J2 **
Probe Resistance (Left) * 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 (Right) R x 1 OHM 9 on J3 and Wire 13C on Gas Valve 0
High-Limit Continuity (Left) 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 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.
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
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
LATER DESIGN INTERFACE BOARD
LED DIAGNOSTIC LIGHTS