11
Fig. 15 —
CoreMax
1
Access Port Assembly
HUMIDI-MIZER
®
ADAPTIVE DEHUMIDIFICA-
TION SYSTEM
Units with the factory-equipped Humidi-MiZer option are capable
of providing multiple modes of improved dehumidification as a
variation of the normal cooling cycle. See Fig 18. The design of
the Humidi-MiZer system allows for two humidity control modes
of operation of the rooftop unit, utilizing a common subcooling/re
-
heat dehumidification coil located downstream of the standard
evaporator coil. This allows the rooftop unit to operate in both a
dehumidification (Subcooling) mode and a hot gas (Reheat) mode
for maximum system flexibility. The Humidi-MiZer package is
factory-installed and will operate whenever there is a dehumidifi
-
cation requirement present.
The Humidi-MiZer system is initiated based on an input from a
discrete input from a mechanical space or return air humidistat.
Humidi-MiZer System Components
The Humidi-MiZer System uses the standard unit compressor(s),
evaporator coil and Round Tube-Plate Fin (RTPF) condenser coil.
Additional refrigeration system hardware includes a subcooler/re
-
heat coil and control solenoid valves. On some models, the evapo
-
rator coil includes a TXV as a standard feature. Units with Humi
-
di-MiZer FIOP also include a factory-installed head pressure con
-
trol system (Motormaster I) to provide proper liquid pressure
during reheat modes. Unique system controls include a reheat re
-
lay mode, and evaporator coil freezestat, and secondary low pres
-
sure switch. See Fig. 16. See Fig. 17 and Table 2 (on page 14) for
Reheat Control input/output (I/O) connections.
SUBCOOLER/REHEAT COIL
The Subcooler/Reheat Coil is mounted across the leaving face of
the unit’s evaporator coil. The coil is a one-row design with two
separate circuits.
• 3-Way Solenoid Valve
• Hot Gas Bypass Solenoid Valve
• Relay Reheat Board (RHB)
• Evaporator Freeze Protection Thermostat
• Low Outdoor Temperature Lockout Switch
• Secondary Low Pressure Switch
• Head Pressure Control
Operating Sequences
The Humidi-MiZer system provides three sub-modes of opera
-
tion: Normal Cooling (see Fig. 18), Subcooling Reheat1 (see
Fig. 19) and Hot Gas Reheat2 (see Fig. 20).
The Reheat1 and Reheat2 modes are available when the unit is not
in a heating mode and when the Low Ambient Lockout Switch is
closed.
Fig. 16 —
Humidi-MiZer Valve Locations
Fig. 17 —
Reheat Control Board (RCB)
1. CoreMax is a registered trademark of Fastest, Inc.
5/8
” HEX
0.47
30°
0.596
1/2-20 UNF RH
1/2
” HEX
45°
WASHER
O-RING
7/16-20 UNF RH
DEPRESSOR PER AHRI 720
+.01/-.035
FROM FACE OF BODY
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
SEAT
CORE
(Part No. EC39EZ067)
RH1.A
RH2.A
RH1.B
RH2.B
Summary of Contents for WeatherMaker 50TC 17-30 Series
Page 34: ...34 Fig 48 RTU Open Overlay for Economizer Wiring ...
Page 35: ...35 Fig 49 VFD Overlay for W2770 Controller Wiring ...
Page 80: ...80 Fig C 50TC 17 28 Control Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 81: ...81 Fig D 50TC 30 Control Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 82: ...82 Fig E 50TC 30 Control Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 83: ...83 Fig F 50TC 17 30 Power Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 84: ...84 Fig G 50TC 17 30 Power Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 89: ...89 Fig L 50TC PremierLink System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 90: ...90 Fig M 50TC RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 91: ...91 Fig N 50TC SAV VFD System Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 93: ......
