Daikin GCU2040PXB1 [141/177] Pressure alarms from probe
Макгруп McGrp.ru
Задайте вопрос
Зарегистрироваться

Daikin GCU2040PXB1 [141/177] Pressure alarms from probe

Daikin GCU2040PXB1 [141/177] Pressure alarms from probe
85
ENG
pRack PR300T +0300018EN rel. 1.5 - 02.05.2017
8.3.2 Pressure alarms from probe
The parameters corresponding to these alarms can be set in branch
C.a.e/C.b.e of the main menu for the suction pressure and D.a.e/D.b.e for
the condensing pressure.
For these types of alarms, reset is automatic and the activation threshold
and di erential can be set, as well as the type of threshold, which may be
absolute or relative to the control set point. The  gure shows an example
of setting the threshold to relative.
Pressure
AlarmSetpoint
Relative threshold
HP
Dierential
Fig. 8.d
Note: for temperature control, the alarms from probe are managed
based on temperature even when pressure probes are  tted.
The e ects of the di erent pressure alarms from probe are described
below.
Low suction pressure from probe
The low suction pressure alarm from probe has the e ect of stopping all
the compressors, ignoring the times.
High suction pressure from probe
The high suction pressure alarm from probe has the e ect of forcing
all the compressors on, ignoring the control times, but observing the
compressor protection times.
Low condensing pressure from probe
The low condensing pressure alarm from probe has the e ect of stopping
all the fans, ignoring the times.
High condensing pressure from probe
The high condensing pressure alarm from probe has the e ect of forcing
all the fans on and stopping all the compressors, ignoring the times. The
reference for the alarm will be the discharge pressure probe (Bab75 or
Bbb75), or if this is not con gured, the gas cooler / intercooler pressure
probe (Bab04 and Dba39).
8.3.3 High pressure prevention
pRack PR300T can manage 3 types of high condensing pressure
prevention actions, involving:
• overriding the compressors and fans
• activating heat recovery
• activating ChillBooster
Prevent by overriding the compressors and fans
The parameters relating to this function can be set in branch G.b.a/G.b.b
of the main menu.
The e ect of this type of prevent action is to force all the fans on at
maximum and switch all the compressors o , except for the minimum
capacity stage, ignoring the control times but observing the compressor
protection times. The minimum capacity stage means one compressor in
the case of compressors without capacity control and modulation devices,
or the minimum capacity stage for capacity-controlled compressors (e.g.
25%), or alternatively the minimum output of the modulation device in
the case of inverters, Digital Scroll
TM
.
As well as the activation threshold, which is always absolute, and the
activation di erential, a compressor deactivation time can be set,
corresponding to the time needed to switch o all the compressors,
except for the minimum capacity stage.
In addition, both the monitoring time and the number of activations in
the speci ed period can be set. If the number of activations is higher,
reset becomes manual.
Prevent by activating heat recovery
The parameters corresponding to this function can be set in branch
G.b.a/G.b.b of the main menu, if the heat recovery function is present.
As well as enabling the function, an o set from the activation threshold
for the prevent by overriding devices function must be set. The activation
di erential for this function is the same as set for the prevent by overriding
devices function.
When reaching the threshold, pRack PR300T activates the heat recovery
function, if the conditions allow.
Prevent by activating ChillBooster
The parameters relating to this function can be set in branch G.b.a/G.b.b
of the main menu, if the ChillBooster function is present.
As well as enabling the function, an o set from the activation threshold
for the prevent by overriding devices function must be set. The activation
di erential for this function is the same as set for the prevent by overriding
devices function.
When reaching the threshold, pRack PR300T force activates the
ChillBooster, if the conditions allow.
The following  gure illustrates the activation thresholds for the prevent
function and the safety devices:
time
Oset
Pressure
HP by pressostat
HP by probe
Prevent
Heat reclaim
or ChillBooster
Fig. 8.e
Page 141 of 177
Copyright HPL January 2021
P4115S Rev 02

Содержание

Похожие устройства

Скачать