Master/Slave Capability (Optional); Master/Slave Operating Parameters - nVent Hoffman SpectraCool Slim Fit Instruction Manual

MASTER/SLAVE CAPABILITY (OPTIONAL)

The Master/Slave capability is included as standard and can accommodate up to four (4) air conditioners in a
single cabinet. In the Master/Slave operating mode, there is a delay period of 20 seconds between startup of
each unit during the startup. For example, the master unit number 1 star�����������
seconds, followed by unit number 3 after another 20 seconds, and so on....
Note the controller default operating mode is single or standalone. To initiate the Master/
Slave operating mode, parameters h24 and h25 require reconfiguration as described below
and a TLAN communication cable is also required to interconnect the air conditioners.
• Connect the door open and/or smoke detected harness to the DS1 and DS2 terminals on the enclosure side of
the air conditioner unit in parallel. The maximum length of the door switch harness between two air conditioners
is 3.33 meters (10 feet). This harness is NOT included with the Master/Slave option. It is offered separately as an
accessory.
• Connect the TLAN harness to the MS1 and MS2 terminals on the enclosure side of the air conditioner unit in parallel.
The maximum length of the TLAN communication cable is 10 meters (30 feet) and 3.33 meters (10 feet) between
the two air conditioners. This harness is NOT included with the Master/Slave option. It is offered separately as an
accessory.
• Select one of the units in the group to be the master unit. This is indicated unit number1.
• Select the slave units, numbers 2, 3 and 4 in sequence.
Parameter
h24
h25
NOTE 6: To initiate Master/Slave operating mode, set parameter h24 (device unit ID) of master unit to 1. Set
parameter h24 of slave units as applicable. Set parameter h24 (Unit number 2) to 2, set parameter h24 (Unit
number 3) to 3, and set parameter h24 (Unit number 4) to 4.
NOTE 7: Set parameter h25 (number of units) of each unit to the same value, for example, h25 = 2 if only two
units are connected in a group, h25 = 3 if three units are in a group and h25=4 if 4 units are in a group.
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MASTER/SLAVE OPERATING PARAMETERS

Description
Device unit ID
Number of units
will start after 20
Default Value Range
0 0 to 4
4 2 to 4
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