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8.9 - Dry cooler free cooling
Units. fitted. with. a. dry. cooler. provide. the.“free. cooling”.
functionality which means that the chilled water system
directly exchanges heat using the air-to-water heat exchanger
(“dry cooler”).
For units with this option, the Touch Pilot Junior control may
use low outside air temperature to cool down the water loop
and satisfy the cooling demand.
The dry cooler is used not only to assist in producing cooling
water to meet the current cooling demand but it also allows
for reducing energy consumption.
The Touch Pilot Junior control distinguishes between two
types of fan control for a dry cooler free cooling option, where
the.first.one.embraces.the.use.of.fan.staging.and.the.second.
one that includes the use of variable speed fan.
8.10 - Additional space heating control
The control provides additional space heating control by
means of a boiler or electric heating stages.
8.10.1 - Boiler control
The unit can control the start-up of a boiler, if it is in heating
mode. When the boiler is operating, the unit water pump is
stopped. The unit and the boiler cannot operate together at
the same time.
The boiler output is activated under the following conditions:
• The unit is in heating mode, but a fault prevents the use
of the unit capacity.
• The unit is in heating mode, but works at a very low
outdoor temperature, making the unit capacity
insufficient..It.is.possible.to.adjust.the.boiler.start-up.
based on the outside temperature. By default, the boiler
is started when the outside air temperature is -10°C.
This.threshold.can.be.modified.by.logged-in.users.in.the.
Heat/Cool.Config.menu.(HCCONFIG).
• The unit is in heating mode and the boiler manual
command is set to “yes” all the time. This setting can be
modified.by.logged-in.users.in.the.Heat/Cool.Config.
menu (HCCONFIG). It is useful if there is no OAT
sensor in the unit.
To set boiler OAT threshold
1..Navigate.to.the.Configuration.menu.
2. Select
Heat/Cool Config
(HCCONFIG).
3. Set
Boiler OAT Threshold
[boil_th].
Boiler OAT Threshold [boil_th]
-15 to 15°C
-10°C
To set boiler manual command
1..Navigate.to.the.Configuration.menu.
2. Select
Heat/Cool Config
(HCCONFIG).
3. Set
Boiler Manual Command
[boil_on].
Boiler Manual Command [boil_on]
No = OAT sensor logic is applied)
Yes = Boiler control activated (for units without OAT sensor, or when
OAT sensor fails)
8.10.2 - Electric heating control
For more information about electric heater, please go to
section 8.11.3 on page 29.
8.7 - Demand limit
The demand limit functionality is used to limit the unit power
consumption whenever possible.
Touch Pilot Junior allows limitation of the unit capacity:
• By means of user-controlled volt-free contacts. The unit
capacity can never exceed the limit setpoint activated
by.these.contacts..The.limit.setpoints.can.be.modified.in.
the SETPOINT menu.
• By setting the DEM_LIM value when the unit is in
Network mode.
• By lag limit set by the master unit (master/slave assembly).
If the unit is not in the Master/Slave assembly, the lag
limit value is equal to 100%.
•
By.night.capacity.limitation..The.limit.can.be.modified.
in the GENCONF menu. See also section 8.8.
Capacity limitation is expressed in percentage, where a limit
value of 100% means that the unit may run with its full
capacity (no limitation is implemented).
To set Switch Limit Setpoint
1. Navigate to the Main menu.
2. Select
Setpoint
(SETPOINT).
3. Set
Switch Limit Setpoint (1, 2, 3)
[lim_sp1/lim_sp2/lim_sp3].
Switch Limit Setpoint … […]
0 to 100
%
To set Night Capacity limitation
1..Navigate.to.the.Configuration.menu.
2. Select
Genunit Config
(GENCONF).
3. Set
Night Capacity Limit
[nh_limit].
Night Capacity Limit [nh_limit]
0 to 100
%
8.8 - Night mode
The.night.period.is.defined.by.a.start.time.and.an.end.time.
that are the same for each day of the week.
During the night period unit capacity can be limited (see also
section 8.8.).
These parameters can be set by logged-in users
in.the.Genunit.Config.menu.(GENCONF).
During the night period the condensing point is increased to
limit the number of fans operating (30WG/30WGA units
with dry cooler condensing control option).
To set night mode settings
1..Navigate.to.the.Configuration.menu.
2. Select
Genunit Config
(GENCONF).
3. Set
Night Mode Start Hour
[nh_start].
4. Set Night Mode End Hour [nh_end].
Night Mode Start Hour [nh_start]
Night Mode End Hour [nh_end]
00:00
