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APC INROOM ACPSC3000 Instruções de Operação Página 47

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47InRoom Controller - Operating Instructions
GE1/GE2
ACW/GCW
CW/CW2
A/G
Dehumidification (Part 2)
There two ways of achieving dehumidification:
1. By reducing the fan speed, this is the only way of dehumi
-
dification for CW-units.
2. By shutting down a part of the evaporator with a solenoid
valve.
Dehumidification type is chosen by the controller according
to the following conditions: Fan speed reduction or compres
-
sor operation with a dehumidification valve present. The two
dehumidification types can never be applied simultaneously.
(See table 2.)
The decision processes of the controller are displayed in detail
in the scheme below.
Table 2
Fan speed reduction Dehum. valve
A, G, ACW, GCW, GE
units without dehum. valve
(e. g. cabinet size 1)
A,G units
ACW, GCW, GE units in
mixed op. and 100% free
cooling
ACW, GCW, GE units
in 100% compressor
operation
CW units
Can the air be dehumidified by the
water temperature ?
Is a GE/CW-valve or a pump
configured ?
Does the compressor run and is
the GE/CW-valve closed or the
pump switched off ?
Is a water temperature sensor
configured ?
Is Tw < TRTset
and Tw < TGEoff
and Twmin < Tw < Twmax ?
Is a dehumidification valve
configured ?
Tw is supposed to be
okay.
Start compressor 1
Fan speed is redu-
ced by "DEHUM
SPEED".
Dehumidification
valve is closed.
GE/CW-valve is opened 100%.
GE-pump runs with 100% speed.
Fan speed is reduced by "DEHUM
SPEED".
Cooling priority
0 (GE) 1(CW) 2(DX)
yes
no
Legend:
Tw - Water temperature
TRTset - Room temperature set point
TGEoff - upper water temperature limit for GE-operation
Twmin - lower water temperature limit for dehumidification
Twmax - upper water temperature limit for dehumidification
GE/CW-valve is closed.
no dehumidification
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
Y
Start
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