Carrier Aquazone 50WD handleiding
Handleiding
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64
COOLING OPERATION
Space Temperature Control
The TruVu operates 1 or 2 stages of compression to maintain the
desired cooling setpoint. The compressor outputs are controlled by
the PI (Proportional-integral) cooling loop and cooling stages
capacity algorithm. The algorithm calculates the desired number of
stages needed to satisfy the space by comparing the control tem-
perature (return air or space) to the appropriate cooling setpoint.
NOTE: The waterside economizer, if applicable, is used for first
stage cooling, in addition to the compressor(s). The following con-
ditions must be true for the cooling algorithm to run:
• Cooling is set to Enable.
• The Fire/Smoke Input and Shutdown modes are inactive.
• Heat mode is not active and the compressor time guard(s)
have expired.
• Condensate overflow alarm status is Normal.
• Fan Status is True (if option is enabled).
• If occupied, the control temperature is greater than the oc-
cupied cooling setpoint.
• Control temperature reading is valid.
• If unoccupied, the control temperature is greater than the
unoccupied cooling setpoint.
• If economizer cooling is available and active, and the econo-
mizer alone is insufficient to provide enough cooling.
• OAT > Cooling Lockout Temperature if OAT is available.
• Source water pump is on (if source water linkage is
active).
• Water Flow Switch Status is True (if option is enabled).
If all of the above conditions are met, the compressors’ relays are
energized as required. Otherwise, they will be de-energized. If
cooling is active and if the SAT approaches the minimum SAT
limit, the fan will be indexed to the next higher speed. If this is in-
sufficient, and if the SAT falls further (equal to the minimum SAT
limit), the fan will be indexed to the maximum speed. If the SAT
still continues to falls 5°F below the minimum SAT limit, all cool-
ing stages will be disabled.
During Cooling, the reversing valve output is held in the cooling
position (either B or O type, as configured), even after the com-
pressor is stopped. The valve does not switch position until the
heating mode is required.
The configuration screens contain the Min SAT parameter as well
as Cooling Lockout based on outdoor air temperature (OAT). Both
can be adjusted to meet various specifications.
Passive Dehumidification
When the unit is configured for auto fan speed control the TruVu
will use the lowest fan speed setting possible to meet the setpoint
and stay within the maximum SAT limits. Using the lowest fan
speed possible in cooling operation will provide a method of pas-
sive dehumidification allowing for enhanced latent capacity.
Hot Gas Reheat Dehumidification
The TruVu provides occupied and unoccupied dehumidification
only on units that are equipped with the reheat option. This func-
tion requires an accessory hardwired space relative humidity sen-
sor. When using a relative humidity sensor to control dehumidifi-
cation during occupied or unoccupied times, the dehumidification
setpoints are used accordingly. Also, you may use a ZS Humidity
Sensor or a network input point System Space RH in place of the
hardwired RH sensor.
When the indoor relative humidity becomes greater than the dehu-
midification setpoint, a dehumidification demand is acknowl-
edged. Once acknowledged, the dehumidification output is ener-
gized, bringing on the supply fan (medium speed), mechanical
cooling, and the integral reheat coil. The controls engage cooling
mode and the waste heat from the compressor cooling cycle is re-
turned to the reheat coil simultaneously, meaning that the revers-
ing valve causes the compressor to operate in the cooling mode.
NOTE: During cooling mode, the unit cools and dehumidifies,
and disables the reheat coil. However, once the call for cooling has
been satisfied and there is still a call for dehumidification, the unit
continues to operate in the reheat mode.
HEATING OPERATION
Space Temperature Control (Reverse Cycle Heating)
The TruVu operates 1 or 2 stages of compression to maintain the
desired heating setpoint. The compressor outputs are controlled by
the heating PI (Proportional-integral) loop and heating stages ca-
pacity algorithm. The algorithm calculates the desired number of
stages needed to satisfy the space by comparing the control tem-
perature (return air or space) to the appropriate heating setpoint.
The following conditions must be true for the heating algorithm to
run:
• Heating is set to Enable.
• The Fire/Smoke Input and Shutdown modes are inactive.
• Cool mode is not active and the compressor time guard has
expired.
• Condensate overflow alarm status is Normal.
• Fan Status is True (if option is enabled).
• If occupied, the control temperature is less than the occu-
pied heating setpoint.
• Control temperature reading is valid.
• If unoccupied, the control temperature is less than the un-
occupied heating setpoint.
• OAT > < Heating Lockout Temperature if OAT is available.
• Source Water Pump is on (if Source Water Linkage active).
• Water Flow Switch Status is True (if option is enabled).
If all the above conditions are met, the heating outputs are ener-
gized as required, otherwise they are de-energized. If heating is ac-
tive and the SAT approaches the maximum SAT limit, the fan is
indexed to the next higher speed. If this is insufficient, and if the
SAT rises further and reaches the Maximum Heating SAT limit,
the fan is indexed to the maximum speed. If the SAT still contin-
ues to rise 5°F above the maximum limit, all heating stages are
disabled.
Space Temperature Control (Reverse Cycle Heating and
Auxiliary Heat)
The TruVu can control a 2-position or modulating water or steam
valve, connected to a coil on the discharge side of the unit and sup-
plied by a boiler, or a single stage ducted electric heater, in order to
maintain the desired heating setpoint. If the compressor capacity is
insufficient, or a compressor failure occurs, the auxiliary heat is
used. Unless the compressor fails, the auxiliary heat only operates
to supplement the heat provided by the compressor, if the space
temperature falls more than 1°F below the desired heating set-
point. (This amount is configurable.) The heat is controlled so the
SAT does not exceed the Maximum Heating SAT limit.
The same conditions required for Reverse Cycle Heating must be
true in order for the Auxiliary Heat algorithm to run.
Auxiliary Modulating Hot Water / Steam Heating
The control can modulate a hot water or steam valve connected to
a coil on the discharge side of the unit, and supplied by a boiler in
order to maintain the desired heating setpoint, if the compressor
capacity is insufficient, or a compressor failure occurs. Unless a
compressor fault condition exists, the valve only operates to sup-
plement the heat provided by the compressor if the space tempera-
ture falls more than 1°F below the desired heating setpoint. The
valve is controlled so the SAT does not exceed the Maximum
Heating SAT limit.
2-Position Hot Water / Steam Heating
The control can operate a 2-position, NO or NC, hot water or
steam valve, connected to a coil on the discharge side of the unit
and supplied by a boiler, in order to maintain the desired heating
setpoint, if the compressor capacity is insufficient or a compressor
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Productinformatie
| Merk | Carrier |
| Model | Aquazone 50WD |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 15865 MB |
