Blodgett Combi Manual Control BCM Service & Installation Manual page 29

BLODGETT OVEN COMBI
Max temperature 100°C/212°F, Forced steam 120°C/348°F
• If P3 (temperature sensor of boiler PT100) register an Ohm value which
is higher than 65°C/149°F it will start filling to HIGH level. If the value is
lower than 65°C/149°F empty and flush the boiler as described below.
• The empty pump M2 gets 208V/230V signal from J11 pin 4 and F6.
• The boiler will now get flushed this is the sequence:
1. Empty boiler 25/35/45 sec. depends on the boiler size
2. Empty boiler 5 sec. and filling 5 sec.
3. Empty boiler 10 sec.
4. Empty boiler 5 sec. and filling 5 sec.
5. Empty boiler 10 sec.
6. Empty boiler 5 sec. and filling 5 sec.
7. Filling 5 sec.
8. Filling to high level
9. Wait 2 sec. check level again
Ready the run the boiler
• The boiler will be filled by MV2 (filling valve) get 24 VAC from J2 pin 10
• The level sensor SE2 is supplied by 12 VDC when the sensor give a
ground signal to J1 pin 33 the IO board will cut off the MV2 valve.
• When the HIGH level is registered, the SSR gets DC voltage on the
terminal -/+2 DC coming from J2 pin 22 and 25 to heat up the water.
• If the level sensor register LOW level (not ground signal on J1 pin 33)
during boiling the MV2 (filling valve) will be activated 3 times for X sec.
• If the IO board does not register HIGH level with in the 3 tries, MV2 will
be activated continuously until HIGH level is reached.
• Temperature in drain P4 J1 pin 47 and 48 above 65°C/149°F, active MV3
24 VAC (J2 pin 11) will cool down until the temperature is below
60°C/140°F.
• When the time runs out H2 (buzzer) will be activated.
• Standard fan speed 50% (5 VDC on inverter terminal Com and Speed, IO
board J2 pin 33 and 34)
• As standard inject water every 8 sec. for 1/10 of sec. through MV1
(injection valve) 24 VAC (IO board J2 pin 8)
• Temperature in drain P4 J1 pin 47 and 48 above 65°C/149°F, active MV3
24 VAC (J2 pin 11) will cool down until the temperature is below
60°C/140°F.
• When the time runs out H2 (buzzer) will be activated.
*Standard settings can be changed in setup
Unit set in "Steam"
Unit set in "Reheating"
Temperature 20°C/68°F to 180°C/356°F
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