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Teamwork

79 Liebert

iCOM

The master unit determines that a 60% call for cooling is required for the system. Since there are two

available cooling units, each unit makes up half of the system proportional band; Unit 1 handles

0-50% system call for cooling and Unit 2 handles 51-100%. For every 1% system call for cooling, each

unit provides 2% of its total cooling capacity.

The 60% system call for cooling exceeds the 50% Unit 1 can provide, so Unit 1 operates at full

capacity. The remaining 10% system call for cooling (60% - 50% = 10%) is handled by Unit 2. Unit 2

responds by operating at 20% cooling capacity (50% - 10% = 40%).

Figure 64 Teamwork Mode 1, serial staging

4.2.4 Teamwork Mode 2

Teamwork Mode 2 is designed to prevent units within a group from working in opposing modes, some

cooling and some heating. It is best applied in large rooms with unbalanced heat loads. In Teamwork

Mode 2, all temperature and humidity parameters are shared. Unit #1 monitors all of the available

unit sensor readings on the network to determine the greatest demand, whether it be for cooling,

heating, dehumidification or humidification.

For example, if most of the units connected in the group have a cooling request and a smaller number

have a call for heating, the units requesting cooling are released to start cooling. The units with a call

for reheat will not reheat, but will operate only their evaporator fans.

Teamwork Mode 2 does not rotate; unevenly distributed working hours are to be expected. Autoset

will not adjust the proportional band in this mode.

NOTE

In Teamwork Mode 2, all units must have the same setpoints. The units’ proportional band,

deadband and related settings may differ.

C1 C2

cooling

+100 %

1 /2 Pr opor tional Band

+tem p.

Unit 2 Deviation : 20 %

Setpoint

C1 C2

cooling

+100%

1/2 Proportional Band

+temp.

Setpoint

- temp.

-100 %

+tem p .

1 /2 Proporti onal Band +100%

1 /2 Pr oportional Band

heati ng

100 %

60 %

System Deviation : 60 %

System pr opor tional band

Unit 1 Deviation : 100%