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Toshiba
4 Relay board
MCC-1431
1.How to remove
1)Perform the step 1-1.
2)Disconnect the connectors and lead cables
connected to other parts from the relay board.
1.Connector
CN01: TB 01 3P Terminal block (3P: White)
CN02: Water heat exchanger board (5P: White)
CN10: TB 05 9P Terminal block (9P: White)
Note
When removing the connector, release the safety
lock of the housing.
3)Release the 3 stoppers of the relay board to remove
the board.
5 Electric parts
assembly
1.How to remove
1)Perform the step 1-1.
2)Disconnect the connectors and lead cables
connected to other parts from the water heat
exchanger board.
1.Connector
CN200: Float switch (3P: Red)
CN201: Pressure switch (2P: White)
CN202: Bimetal thermostat (3P: Yellow)
CN203: TC sensor (2P: Yellow)
CN204: TWI sensor (3P: Brown)
CN205: TWO sensor (2P: Red)
CN206 THO sensor (3P: White)
CN207: Lo pressure sensor (2P: Blue)
CN212: Lo pressure sensor (4P: White)
CN603: Pump (3P: Yellow)
Disconnect the heater power source cable (For
backup heater and hot water cylinder heater) from
the MgSW.
Note
When removing the connector, release the safety
lock of the housing.
3)Remove the fixed screws.
(ST2T Ø4 × 8, 2 screws)
4)Remove the electric parts assembly by pulling it
toward you while pulling it upward because the
assembly back side has a hook holding structure.
No.
Exchange parts name
Work procedure Remarks
Relay board
Electric parts assembly
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 129 Monday, October 5, 2009 2:09 PM