WSHP Operating Modes
• Cooling– Dehumidification as a byproduct– Typical SHR of 0.72 to 0.78
• Heating
• Some WSHPs have Reheat for Humidity Control– Hot Gas Reheat– Condenser Water Reheat– New Energy Reheat
• Electric or hot water– ClimaDry (patent pending)ClimaDry (patent pending)
• Modulating condenser water regenerative reheatModulating condenser water regenerative reheat
ClimaDry Option Components
LAT sensor
Reheat coil
Space between reheat and evaporator coils to maximize moisture removal
Evaporator coil
Low fan speed duringdehumidification mode
ClimaDry Option Components
Modulating reheatwater valve (with integrated LAT controller)
Condenser
Condenser waterregeneration pump
ClimaDry Option Components
• DXM Microprocessor Controller– Incorporates reheat control logic
– Utilizes standard humidistat, dehumidistat or integrated thermostat to initiate reheat mode (selected by dip switches)
– Uses low fan speed during dehumidification mode
ClimaDry Features
• 100% reheat– Taps full heat of rejection for reheat as needed– Provides neutral supply air temperature for assured comfort during
dehumidification mode
• Modulating reheat– precise control of supply air temperatures via integral proportional
controller (72 +/- 3F adj)– compensates for variations of EAT or EWT
• Simple– Integrated controls requiring only on/off dehumid call
• DDC options are compatible
– Standard ARI-rated refrigeration circuit – Standard cabinet with factory-installed components
• Uses “free” waste heat for reheat– heat of rejection from building water loop
PatentPending
ClimaDry versus the Competition
ClimaDry Hot Gas ReheatModulating control ON/OFF control"Neutral" supply air temperature Uncontrolled supply air temperatureSimple refrigeration circuit Complicated refrigeration circuitNormal refrigeration pressures Unusual & varying refrigeration pressures
Full Reheat Partial Reheat
ARI ratedperformance
Non-ARI product
ClimaDry Applications
• ClimaDry can be applied to most common low SHR applications, such as . . . – High occupancy loads (classrooms, etc.)– High latent loads (locker rooms, spas)– High infiltration loads (entry areas)– Untreated make up air intake (low fractions)– Humid climates– Anywhere humidity is a problem
ClimaDry Reheat Operation
• Return air is cooled and dehumidified by the evaporator coil
• Supply air is reheated by the hydronic reheat coil to “neutral” conditions
• Dehumidification capability is determined by the heat pump latent capacity rating:
LC = TC - SC
ClimaDry Operation
Size Mbtuh lbs/hr kW kg/hr18 4.7 4.4 1.4 2.024 6.1 5.7 1.8 2.630 6.8 6.4 2.0 2.936 9.6 9.0 2.8 4.141 9.7 9.1 2.8 4.142 11.0 10.3 3.2 4.748 12.7 11.9 3.7 5.460 15.2 14.2 4.5 6.4
GC Series Latent Capacity at 85°F (29.4°C) EWT
ClimaDry Controls• DXM board has built-in microprocessor control for reheat
operation• Cooling takes precedent• Reheat is engaged by …
– Dehumidistat– Humidistat– ClimateMaster ATP32U02 thermostat– DDC controls
• Units with PSC or ECM operate at lower airflow during ClimaDry operation
• Supply air leaves at 72ºF (22ºC) +/- 3ºF (+/-2ºC)• Optional potentiometer allows further adjustment, +/- 3ºF
(+/-2ºC)
ClimaDry Control Notes
• DXM board required• DIP switches allow choice of dehumidistat or
humidistat• Not all integrated t-stats are created the
same!– Some thermostats with dehumidification mode
only allow dehumidification output in cooling mode (e.g. Carrier Thermidistat)
– ClimateMaster ATP32U02 allows reheat operation even when cooling is not required
• ClimaDry = Modulating Reheat with ON/OFF control input!
ClimaDry Installation
• All components are inside unit• Water piping is the same as any other
ClimateMaster unit• Air bleed must be used to purge air from
reheat coil• ClimaDry MUST NOT be used for 100%
outside applications– Reheat coil could be subject to freezing conditions
ClimaDry Availability
• GCV series– Standard range vertical units for Boiler/Tower
applications
• GLV series– Large tonnage (6-25 tons) vertical units for Boiler/Tower
or Geothermal applications
• GS, TS, TT series– Horizontal/Vertical Upflow/Vertical Downflow– R22 (GS) or R-410A (TS/TT)– Extended range (Blr/Twr & Geothermal)– Ultra High Efficiencies– 1.5 to 6 tons
In March 1 Commercial Price List and EZ-Order