Carrier Aquazone 50WD handleiding
Handleiding
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failure occurs. Unless a compressor fault condition exists, the
valve only opens to supplement the heat provided by the compres-
sor, if the space temperature falls more than 1°F below the desired
heating setpoint. The valve is controlled so the SAT does not ex-
ceed the Maximum Heating SAT limit and is subject to a 2-minute
minimum OFF-time to prevent excessive valve cycling.
Electric Auxiliary Heat
The control can operate a factory or field-installed single or two
stage of electric heat that is installed on the discharge side of the
unit, in order to maintain the desired heating setpoint, if the com-
pressor capacity is insufficient or a compressor failure occurs. Un-
less a compressor fault condition exists, the heat stage only oper-
ates to supplement the heat provided by the compressor if the
space temperature falls more than 1°F below the desired heating
setpoint. The heat stage is controlled so the SAT does not exceed
the Maximum Heating SAT limit and is subject to a 2-minute min-
imum OFF-time to prevent excessive cycling.
“Boilerless” Control (Auxiliary Heat)
The TruVu can be configured to control the auxiliary heat source
for “boilerless” types of systems or system with no means for heat
injection into the source water loop. Compressor will be disabled,
and the auxiliary heat source will be enabled when the entering
water temperature drops below the configurable boilers electric
heat setpoint.
WATERSIDE ECONOMIZER
The TruVu can provide modulating, or 2-position waterside econ-
omizer operation (for a factory or field-installed economizer coil
mounted to the return air side of the unit and connected to the
source water loop), in order to provide free cooling or preheating,
when water conditions are optimal. Waterside economizer settings
can be accessed on Properties > Equipment > Status.
The following conditions must be true for economizer operation:
• SAT reading is available.
• EWT reading is available.
• If occupied, the control temperature is greater than the oc-
cupied cooling setpoint or less than the occupied heating
setpoint and the source water is suitable.
• Space temperature reading is valid.
• If unoccupied, the SPT or ZS is greater than the unoccu-
pied cooling setpoint, or less than the unoccupied heating
setpoint, and the source water is suitable.
Modulating Waterside Economizer Control
Modulates a water valve to control source water flowing through a
coil on the entering air side of the unit
Cooling
Provides an economizer cooling function by using the source wa-
ter loop when the entering water loop temperature is at least 5°F
below space temperature. If the water loop conditions are suitable,
the valve modulates open to maintain a Supply Air Temperature
that meets the load conditions. If the economizer coil capacity
alone is insufficient for a period greater than 5 minutes, or if a high
humidity condition occurs, then the compressor starts, in order to
satisfy the load. If the SAT approaches the Minimum Cooling SAT
limit (HOME > CONFIG > UNIT), the economizer valve modu-
lates closed during compressor operation.
Heating
In addition, the control modulates the water valve if the entering
source water loop temperature is suitable for heating (at least 5°F
above space temperature) and heat is required. The valve is con-
trolled in a similar manner, except to satisfy the heating require-
ment. If the coil capacity alone is insufficient to satisfy the space
load conditions for more than 5 minutes, then the compressor
starts in order to satisfy the load. If the SAT approaches the Maxi-
mum Heating SAT limit, the economizer valve modulates closed
during compressor operation.
2-position Waterside Economizer Control
2-Position Waterside Economizer Control has the capability to
control a NO or NC, 2-position water valve to control source wa-
ter flow through a coil on the entering air side of the unit.
Cooling
The purpose is to provide a cooling economizer function directly
from the source water loop when the entering water loop tempera-
ture is at least 5° F below space temperature. If the optional coil is
provided and the water loop conditions are suitable, then the valve
opens to provide cooling to the space, when required. If the capac-
ity is insufficient for a period greater than 5 minutes, or if a high
humidity condition occurs, the compressor is started in order to
satisfy the load. If the SAT reaches the Minimum Cooling SAT
limit, the economizer valve closes during compressor operation.
Heating
In addition, the economizer control opens the water valve, if the
entering water loop temperature is suitable for heating (at least 5°F
above space temperature) and heat is required. The valve is con-
trolled in a similar manner, except to satisfy the heating require-
ment. If the coil capacity is insufficient to satisfy the space load for
more than 5 minutes, then the compressor is started to satisfy the
load. If the SAT reaches the Maximum Heating SAT limit, the
economizer valve closes during compressor operation.
Indoor Air Quality and Demand Controlled
Ventilation
If the optional hardwired indoor air quality sensor is installed, ZS
CO
2
(IAQ), or the System Space AQ network input point is used,
the TruVu maintains indoor air quality with a modulating OA
damper, which provides demand controlled ventilation. The con-
trol operates the modulating OA damper during occupied periods,
monitors the CO
2
level, compares it to the configured setpoints,
and adjusts the ventilation rate, as required. The control provides
proportional ventilation to meet the requirements of ASHRAE
specifications by providing a base ventilation rate and then in-
creasing the rate as the CO
2
level increases. The control propor-
tionally increases ventilation when the CO
2
level rises above the
start ventilation setpoint and reaches the full ventilation rate when
the CO
2
level is at or above the maximum setpoint.
Configure the minimum damper position to ensure that proper
base ventilation is delivered when occupants are not present. Ac-
cess the IAQ configurations through the configuration screen.
The following conditions must be true in order for this algorithm
to run:
• Damper Control is configured for DCV.
• The Fire/Smoke Input and Shutdown modes are inactive.
• Fan status is True (if option is enabled).
• The unit is in an occupied mode.
• IAQ sensor reading is greater than the DCV start CTRL
setpoint.
The control has the following 4 adjustable setpoints:
• DCV Start Ctrl Setpoint
• DCV Max Ctrl Setpoint
• Minimum Damper POS
• DCV Max Vent Damper POS
NOTE: For the damper to maintain proper base ventilation, you
must configure the fan as Continuous or Always On.
2-Position OA Damper
Alternatively, the controller can be configured to operate as a ven-
tilation damper in a 2-position ventilation mode to provide the
minimum ventilation requirements during occupied periods.
Differential pressure switch / water flow switch
The flow switch monitors the pressure difference between two
points on the waterside. An optional input can be configured as
condenser water flow status input. If configured, the flow status
must be ON for 3 seconds to enable the compressors.
Bekijk gratis de handleiding van Carrier Aquazone 50WD, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Carrier |
| Model | Aquazone 50WD |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 15865 MB |
