8 - STANDARD CONTROL OPERATIONS AND OPTIONS
8.8
Controlling capacity
The control adjusts the capacity to keep the water exchanger
temperature at its setpoint. Compressors are started and
stopped in a sequence designed to equalize the number of
starts (value weighted by their operating type).
8.8.1 Circuit loading sequence
The function determines in which order the circuit capacity is
changed. Compressor loading is managed by starting/stopping
compressors. Two types of sequencing, i.e. balanced and
staged loading sequence, are available and can be configured
by the user via the user interface.
Balanced loading sequence:
The control maintains equal
capacity between all circuits as the machine loads and unloads.
Balanced loading sequence is the default sequence employed
by the control.
Staged loading sequence:
The control loads the lead circuit
completely before the lag circuit is started. When the load is
decreasing, the lag circuit is unloaded first. Staged loading
sequence is active when one of the circuits is shut down due
to its failure; the circuit is in capacity override mode; or the
remaining circuits are shut down or fully charged.
To set the circuit loading sequence
1. Navigate to the Configuration menu (logged-in users only).
2. Select
General Configuration
(GENCONF).
3. Set Staged Loading Sequence [seq_typ].
Staged Loading Sequence [seq_typ]
No/Yes
No (staged loading NOT active)
8.8.2
Capacity for multi-circuit units
For units with more than one circuit, the lead/lag function
determines which circuit is the lead circuit and which circuit is
the lag circuit. This function controls the start/stop sequence of
two refrigeration circuits called circuit A and circuit B.
The circuit authorised to start first is the lead circuit. Lead circuit
is used first for capacity increases and at the same time should
be decreased first when decreasing capacity. The lead/lag
circuits can be selected manually or automatically.
Manual lead/lag circuit determination:
Circuit A or circuit B
selected as the lead circuit. The selected circuit takes priority
over another circuit.
Automatic lead/lag circuit determination:
The control
system determines the lead circuit to equalise the operating
time of each circuit (value weighted by the number of start-
ups of each circuit). As a result, the circuit with the lowest
number of operating hours always starts first.
To set circuit priority (manual or automatic selection)
1. Navigate to the Configuration menu (logged-in users only).
2. Select
General Configuration
(GENCONF).
3. Set Cir Priority Sequence [prio_cir].
Cir Priority Sequence [prio_cir]
0
Auto
1
Circuit A lead
2
Circuit B lead
8.9
Night mode
Night mode allows users to configure the unit to operate with
specific parameters in a specific time period, e.g. at night.
If the night mode is set, then during the night period:
The unit capacity is limited.
In order to reduce the noise level, the number of fans
allowed to operate is restricted (cooling mode only).
The night period is defined by a start time and an end time
that are the same for each day of the week.
The night mode
settings as well as the maximum capacity value can be set by
logged-in users only.
To set circuit priority
1. Navigate to the Configuration menu (logged-in users only).
2. Select
General Configuration
(GENCONF).
3. Set parameters corresponding to the night mode.
Night Mode Start Hour [nh_start]
00:00 to 24:00
Night Mode End Hour [nh_end]
00:00 to 24:00
Night Capacity Limit [nh_limit]
0 to 100%
100%
8.10 Controlling the coil pressure
The coil pressure of each circuit is managed by four fans
maximum. AQUACIAT
POWER
LD-ST and ILD-ST units come with
fixed speed fans only, whereas AQUACIAT
POWER
LD-HE series
and ILD-HE series units may be fitted with variable speed fans
that provide higher part load efficiency and reduced noise level.
In cooling mode, the condensing pressure is controlled
independently in each circuit based on the saturated condensing
temperature. The control permanently adjusts its setpoint to
guarantee optimal performance and ensure anti-short-cycle
protection of the fans.
In heating mode, the evaporating pressure is controlled
independently on each circuit based on the saturated suction
temperature. The control permanently adjusts its setpoint
to guarantee optimal performance, delay and limit frost
accumulation on coils.
AQUACIAT
POWER
EN-44
Содержание AQUACIATPOWER ILD-HE Series
Страница 1: ...Instruction manual 05 2021 10536 CONNECT TOUCH AQUACIAT POWER I LD ST HE 602 2000...
Страница 2: ......
