Carrier WeatherMaker 50FC handleiding
Handleiding
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Humidi-MiZer Dehumidification System
(Optional)
Units with the factory-installed Humidi-MiZer system option
are capable of providing multiple modes of improved dehu-
midification as a variation of the normal cooling cycle. The
Humidi-MiZer system option includes additional valves in the
liquid line and discharge line of the refrigerant circuit and a re-
heat coil downstream of the evaporator. Humidi-MiZer system
operation requires the installation and configuration of a rela-
tive humidity switch input or a space relative humidity sensor.
These provide the dehumidification demand to the control.
With Humidi-MiZer system units there are two additional HVAC
modes available for the user: Dehumidification and Dehum/Mech
Cooling. Selection of the Dehum/Mech Cooling mode is deter
-
mined by the dehumidification demand and the cooling demand.
Table 3 shows the corresponding circuit mode and output status
for the different demand combinations.
NORMAL COOLING
This mode is the standard rated cooling system performance,
and occurs when there is cooling demand without dehumidifi-
cation demand.
For 50FC 20-30 units, refrigerant flows from the outdoor con-
denser through the de-energized 3-Way Liquid Diverter Valve
(LDV) to the expansion device bypassing the reheat condenser
coil. The Reheat Discharge Valve (RDV) is closed.
(See Fig. 62.)
DEHUM/MECH COOLING (SUBCOOLING) MODE
This mode increases the latent heat removal and decreases sen-
sible cooling compared to normal cooling. This occurs when
there is a cooling and dehumidification demands.
For 50FC 20-30 units, refrigerant flows from the outdoor con-
denser, through the energized 3-Way LDV and through the re-
heat condenser coil to the expansion device. The RDV is
closed. (See Fig. 63.)
DEHUMIDIFICATION (HOT GAS REHEAT) MODE
This mode provides maximum latent cooling with little to no
sensible capacity. This occurs when there is a dehumidification
demand and no cooling demand.
For 50FC 20-30 units, this is the same as the Subcooling mode
but the RDV is open, which provides some compressor dis-
charge gas to the reheat condenser to further increase the reheat
of the evaporator air stream. (See Fig. 64.)
REHEAT CONTROL
When there is only a cooling demand, the unit will operate in nor-
mal cooling mode. When there is only dehumidification demand,
the unit will operate in Dehumidification mode (Hot Gas Reheat).
When there is both cooling demand and dehumidification de-
mand, the unit will operate in Dehum/Mech Cooling mode (Sub-
cooling). During Dehumidification and Dehum/Mech cooling
mode, the unit will run all cooling stages.
Fig. 62 — Normal Cooling Mode – Humidi-MiZer System for 50FC 20-30
Table 3 — Humidi-MiZer System Control Modes (50FC 20-30)
DEMAND AND MODE OUTPUTS
LDV Valve
3-WAY
RDV Valve
2-WAY
Space Humidity Circuit Cooling Demand Circuit Mode Circuit Compressor
— — No power Off Off Off (closed)
Low
No Off Off Off Off (closed)
Yes Cool On Off Off (closed)
High
Yes Dehum/Mech Cooling On On Off (closed)
No Dehum On On On (open)
Hot Gas Reheat Coil
Compressor
Outdoor Air
Indoor Supply
Air
Indoor Return Air
3-Way
Valve
= Closed Valve
= Open Valve
= 3-Way Valve
RDV
Valve
Condenser Coil
Evaporator Coil
Expansion
Valve
(TXV)
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Productinformatie
| Merk | Carrier |
| Model | WeatherMaker 50FC |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 8511 MB |
