Multiaqua MHRC2 - APPENDIX A - MAGNUM no Run Capacity Run States

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22. APPENDIX A - MAGNUM No Run Capacity Run States

There are a number of functions that will not allow the MHRC to run, as follows: (These may be

viewed by pressing selecting ‘Status” from the Menu key.)

1. UNIT IN POWER UP-

The MAGNUM Chiller V8 software utilizes Set Point #23 “Power Up Delay” (Typically 60 seconds) prior to

starting the algorithm.

2. RUN/STOP SW OFF-

(Optional)- Hard wired to a sensor input.

3. NETWORK SW OFF-

(Optional)- This is wired via a communication port from a BMS system.

4. OFF- NO EVAP FLOW-

Flow switch input is not made.

5. NO RUN-I/O LOST-

Communication to the Input and Output expansion boards is checked once every second. (Visual veriﬁ cation

can be made by viewing the LED next to the MAGNUM-I/O communications terminal block. If communica-

tions is lost to any board the entire LCC is shut down & locked out and a “LOST I/O SHUTDOWN” alarm is

generated. The user is required to correct the communication lost and press the Lockout Reset button on the

MAGNUM’s Keypad or thru MCS-CONNECT.

6. UNIT IN LOCKOUT-

This state is entered whenever a critical situation is encountered that could cause harm to the MHRC. Items

such as no ﬂ ow, invalid critical sensor and emergency stop will force the system into this state. Lockouts can

be reset without authorization from the keypad or MCS-CONNECT program; however if the lockout condition

has not been corrected, the system will again be forced into the LOCKOUT state. In this state, all RO’s except

ALARM RO and the oil heater RO for screws with an oil pump are turned OFF & placed in the ‘LOCKOUT’

state.

7. SCHEDULED OFF-

This state is entered when the schedule is calling for the chiller to be off.