B&C Technologies DI-475 Industrial - Manual (Page 43)

1. Possible overheating condition…microprocessor controller (computer) has sensed a
temperature which has exceeded 225 F
“Hot” display will not clear until temperature sensed has dropped to 225 F or lower
and the microprocessor controller (computer) is manually reset by pressing the
CLEAR/STOP” key
T. Gas heating unit is not operating (no heat)… no spark at burner area when the
dryer is
First started, and both the heat indicator dot and the “HEAT” relay output L.E.D. are
on
1. Fault in sail switch circuit
a. Sail switch is out of adjustment or has failed
b. Sail switch damper is not closing or is fluttering
1) Lint drawer/screen is dirty
2) Restriction in exhaust
3) No exhaust air flow
2. Fault in burner hi-limit circuit or thermostat
3. Fault in 225 hi-limit switch or thermostat
4. Failed direct spark ignition (DSI) module
5. Failed DSI igniter/flame-probe assembly
U. Heating unit (GAS MODELS or STEAM MODELS) is not operating (no heat) and the
microprocessor controller (computer) L.E.D. heat indicator dot is on but the
“HEAT”
relay output L.E.D. is not on…
1. Failed microprocessor controller (computer)
V. No heat (GAS MODELS)…igniter sparks, burner goes on and off right away
1. DSI igniter/flame-probe out of adjustment…reposition closer to the flame area
2. Sail switch is fluttering
a. Lint drawer/screen is dirty
b. Restriction in exhaust duct work
c. Blower impeller/fan going in the wrong direction
3. Insufficient make-up air