Westric IW Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 37 / 82

76-5276-05 Page 37 of 82
System Operation
The operation of the unit is completely automatic, the program and the setpoints are factory configured, so no adjustment
is necessary on the start up unless the client specifically requests it.
The system is composed of one or more air conditioning units. In the case of more than one unit connected in the same
communication network, these all work together but each one makes the decision of cooling and ventilation individually
based on the information obtained from their own sensors.
Once a unit fails, the rest of the units will increase their capacity to cover the failure unit through the variable speed of EC
fans.
Start Up
To turn on the system, the power supply must be connected and all the breakers must be turned on through the main
knob of the unit.
Permanent shutdown
To permanently shutdown a unit, turn off the main breaker through the main knob that is located behing the door of the
front panel.
This type of shutdown is recommended only when repairs are needed; note that this this type of shutdown causes the loss
of communication between the PLCs and therefore the remaining units will have communication alarms.
Cooling Control
The Westric´s IW units offers all the precision units functions, the hot aisle air enters the units by the continuous mode
fans, then it is filtered, cooled and returned into the cold aisle.
Return air sensors:
The unit has two temperature sensors, one placed one third the height from the floor and the second two thirds the height
from the floor, in this way the controller can determine which is the hottest condition of that air inlet.
It also has a relative humidity sensor.
Outlet air sensors:
Like the return sensors, the unit has two output temperature sensors, one placed one third the height from the floor and
the second two thirds the height from the floor.
Cooling temperature control:
The controller modulates the speed of the fans that is governed by an algorithm in the program of the controller, which
makes the decisions to maintain the temperature of the cold or hot aisle and obtain the greatest energy savings. The unit
is factory configured to work with the input sensors (hot aisle) to contrast against the temperature setpoint.
To change this configuration by the outlet sensors (cold aisle), you must request it to specialized personnel who will
perform this task.
The parameters described here are indicative.
Cold aisle cooling 20 ° C ± 0,5 ° C
The unit takes the air from the hot aisle, cools it and returned it into the cold aisle.
The compressor starts when the temperature exceeds 20.5 ° C and switches off when it drops below 19.5 ° C. The
controller, based on an algorithm of its program, modulates the fans and the start of the compressor to stabilize the cold
aisle at 20 ° C.
Hot aisle cooling 30 ° C ± 0,5 ° C
For the hot aisle the controller uses the same algorithm with the difference that the hot aisle setpoint is 30 ° C
These devices are factory configured with the input air temperature sensors for the reference of the setpoint, that is to say
that it controls the "Hot Aisle", it has the possibility of configuring its operation with the air outlet sensors "Cold Aisle", For
this type of configuration you must request it from factory when purchasing the unit, or if installed, this task must be done
by the official service.
Heating 15 ° C ± 1 ° C (Optional)
The heating turns on at 14 ° C and turns off at 16 ° C.