Cooling
22
Free cooler
There is an additional option to use a free air cooler (BFC) to reduce energy consumptions. If a BFC is to be installed as part of
the system, the free option mode needs to be enabled. This is achieved by moving the free cooler jumper to the YES position (left
hand position). This jumper is located as per the diagram below. Once the jumper has been set to yes, a two-core cable will need
to be connected from the terminal block to the terminals on the BFC unit.
Master / Slave wiring
When using two BMIEP evaporators connected to the same BMOP condensing unit, the controllers MUST be linked together to run
in unison as follows.
1. One BMIEP evaporator must be selected to be the master unit and the other BMIEP the slave unit.
2. Isolate the electrical supply to all units.
3. Open the slave BMIEP controller front fascia and remove the display lead plug from the power PCB board.
4. Connect a 3-core cable to the Master/Slave connection on the top left corner of the board, and route out the back of the unit.
5. Open the master BMIEP controller front fascia and connect the 3-core cable to the Master/Slave connection, ensuring the
cores are matched to the same terminals on both boards.
6. Leave the display lead connected on the Master BMIEP.
7. Re-assemble the controller fascias.
8. When running the master BMIEP display will operate as normal, with the slave BMIEP running in unison. The slave BMIEP
controller will remain blank and the setpoint will be managed through the master BMIEP.
Note: See Page 34 for Wiring
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