Liebert TM-10098 service manual Unit Lead/ Lag or Running/ Standby Function, Teamwork Mode

iCOM Control Training and Service Manual

Teamwork Mode 2

In teamwork mode 2 all system parameters are shared equally as in teamwork mode 1. The lead unit will define the temperature and humidity averages for the operational needs if there is a request for cooling, heating, dehumidification or humidification.

If there is a temperature control request because of a need for either cooling or heating (determined by highest or lowest temperature of all the units), teamwork mode 2 activates all of the connected units. Each unit will operate in the cooling or heating mode using their individual temperature control settings. If in the cooling mode the heating function is disabled in all units. If in the heating mode the cooling function is disabled in all units.

If there is a humidity control request because of a need for either humidification or dehumidification (determined by highest or lowest humidity of all the units), teamwork mode 2 activates all of the connected units. Each unit will operate in the humidification or dehumidification mode using their individual humidity control settings. If in the humidification mode the dehumidification function is disabled in all units. If in the dehumidification mode the humidification function is disabled in all units.

Teamwork Mode 2 does not allow unit rotation (lead/ lag), unbalanced unit working hours are to be expected.

Unit Lead/ Lag or Running/ Standby Function

This program will allow the user to select the multi-unit function of Lead and Lag, or as sometimes stated Running and Standby, by selecting the number of running and standby units to provide the redundancy needed in the space.

Typical Lead/ Lag (Running/ Standby) Function

The lead/ lag operational sequence has a lead (running) unit operating and an alarm becomes active (selected by alarm programming). The active alarm in the lead unit will cause the first lag (standby) unit to active and maintain the space conditions. If multiple units are selected as lag (standby) the units will continue to rotate on active alarms as long as a lag unit is available. If there are no lag (standby) units left in the sequence the first failed will restart (if not in a critical alarm state i.e. fan overload, etc).

Note: The unit with the active alarm will operate in the fan only mode for 3 minutes before going into a standby mode to stabilize conditions, then it will turn off.

49