Operation Of Two Units In Master/Slave Mode; Heat Machine Units 30Xwh- And 30Xwhp; Physical Data For Heat Machine Units; Electrical Data For Heat Machine Units - Carrier 30XW Installation, Operation And Maintenance Instructions

7.5 - Operation of two units in master/slave mode

The control of a master/slave assembly is in the entering
water and does not require any additional sensors (standard
configuration). It can also be located in the leaving water.
In this case two additional sensors must be added on the
common piping.
All parameters, required for the master/slave function must
be configured using the MST_SLV menu.
All remote controls of the master/slave assembly (start/
stop, set point, load shedding etc.) are controlled by the
unit con-figured as master and must only be applied to the
master unit.
Each unit controls its own water pump. If there is only one
common pump, in cases with variable flow, isolation valves
must be installed on each unit. They will be activated at the
opening and closing by the control of each unit (in this case
the valves are controlled using the dedicated water pump
outputs). See the 30XA/30XW Pro-Dialog Control IOM
for a more detailed explanation.
30XW with configuration: leaving water control
1
Legend
1
Master unit
2
Slave unit
Control boxes of the master and slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard for units with hydraulic
module)
Additional sensors for leaving water control, to be connected to channel 1
of the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors

8 - HEAT MACHINE UNITS 30XWH- AND 30XWHP

8.1 - Physical data for Heat Machine units

The physical data for the Heat Machine units 30XWH-/
30XWHP are the same as for the 30XW--/30XW-P units.
Please refer to chapter 4.1.

8.2 - Electrical data for Heat Machine units

The electrical data for the Heat Machine units 30XWH-/
30XWHP are the same as for the 30XW--/30XW-P units.
Please refer to chapter 4.2.
8.3 - Dimensions and clearances for Heat Machine
units
The dimensions and clearances are the same as for the
30XW--/30XW-P units. Please refer to chapter 3.

8.4 - Operating range for Heat Machine units

The operating limits are the same as for the 30XW--/30XW-P
units. Please refer to chapter 6.1.

8.5 - Operating modes for Heat Machine units

8.5.1 - Cooling mode
This operating mode is the same as that for 30XW units.
The unit controls on the cooling setpoint.
8.5.2 - Heating mode
Unlike in the cooling mode, the unit uses the heating
setpoint in this configuration. The evaporator leaving water
2 control (lowest setpoint taken into consideration) is still
maintained to prevent operation at very low temperatures.
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