Economizer failure alarm, Compressor run alarm

economizer failure alarm

Upon failure of either economizer to open on command or close on command, the Economizer Failure Alarm will open normally closed contacts to signal the failure. To utilize this feature, terminals 8 & 9 must be connected to the shelter alarm panel.

2-compressor run alarm

If both compressors are running at the same time, the 2-Compressor Run Alarm will open indicating this condition.

note: The alarm LED display board is shipped uninstalled to protect it from possible damage during installation of the wiring to main controller board and/ or the alarm board. It is polarity sensitive and is keyed so it can only be installed in correct position.

Note: The LED display board can be replaced if needed independently of the alarm board. Bard part number is 8612-022.

alarm led display board

MIS-2042

alarm wiring

Alarm relays can be wired for NO (close on alarm) or NC (open on alarm) strategy.

Alarm relays can be used individually if there are enough available building alarm points, or can be arranged into smaller groups or even a single group so that all alarm capabilities can be utilized.

When multiple alarms are grouped together and issued as a single alarm, there will no off-site indication of which specific problem may have occurred, only that one of the alarms in the group has been triggered. The individual alarm problem will be shown on the LED display on the face of the controller.

Note: All alarm and output relays are Form C (SPDT) dry contacts rated 1A @ 24 VAC.

Note: All alarm relay outputs have 10-second delay in acutally issuing to protect against nuisance alarm signals.

The Power Loss 1, Power Loss 2 and controller alarm relays are all “reverse actuated”, which means they are continuously energized (the NO contact is closed) and switched to NC position upon alarm condition. Therefore, it is important to closely follow the alarm board connection diagrams that follow.

Any alarm feature that is not desired can simply be ignored (not connected).

note: The LED display board is polarized and will only fit in one direction as shown. It must be fully inserted in order for the controller to function properly.

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MV4000 specifications

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