Belshaw Brothers BARO-G, Operator'S Manual

Page: 36 / 44

ETL File 3028821
34
V.B2006
Service and Troubleshooting
Model BARO Rack Oven
No or Low Heat
1.
Door Open in display
•
If display reads Door Open while door is shut and rack carrier lifts and rotates
check MR3 for normal operation. Test heat circuit by jumping J5 on relay
board; at this point display should read Preheat and burner should fire. If J5 is
jumped and display still reads door open replace relay board.
•
If display reads Door Open and rack does not lift or rotate check door switch
and MR3 for normal operation. Test heat circuit by jumping J5 on relay board;
at this point display should read Preheat, burner should fire and rack carrier
should lift and rotate. If J5 is jumped and display still reads door open replace
relay board.
2. Preheat in display
•
LD3 on relay board will illuminate when board is calling for heat; 24VAC from
wire 47 to wire 45 should then be present.
•
If blower delay is set oven will not call for heat until set time elapses.
3. No power to heat circuit wires 54 and 45
•
Check to assure circulation blower contactor is closed and 24VAC is present
between wires 49 and 45 (ground on ovens built after Jan. 2005). If voltage is
present 24VAC should also be present at heat circuit.
•
Check for 24VAC on relay board when LD3 is illuminated between wires 47
and 45. Check air switch for 24VAC to ground. Jump out air switch or test for
continuity. Check for water in air line; bend upward loop in airline to prevent
water from entering air switch. Check for required airflow: Singles (BARO-1)
1520 FPM @ 530 CFM. Doubles 2300 FPM @ 800 CFM. A negative draw of
0.6” Water Column is necessary to close air switch. This can be an intermittent
issue; if the vent motor is tripping on thermal overload or pulling a borderline
volume of air it can appear to be an oven issue. Keep checking water column if
air switch is intermittently opening. 120VAC is supplied to roof vent blower
through CB5 and MR2. 120VAC should be present on TB1 and TB2.
•
If air switch is closed test high limit; at this point 24VAC should be present at
circulation blower contactor wire 49 to 45 (ground on ovens built after Jan.
2005) and then to wire 54 to heat circuit.