THE CLIMATEMASTER CLIMADRY® II
REHEAT AND DEHUMIDIFICATION OPTION
OVERVIEW
Indoor Air Quality (IAQ) and Relative Humidity (RH) are
increasingly becoming design issues that must be addressed
by selecting heating and cooling equipment with advanced
capabilities. The ClimateMaster ClimaDry® II reheat and
dehumidification option offers unique features unlike anything
currently available today.
The patented ClimaDry® II option is an innovative means of
providing fully modulating reheat without the complication
of intricate refrigeration controls. ClimaDry® II is a form of
Hot Gas Generated Reheat, which utilizes one of the biggest
advantages of a water source heat pump (WSHP), the transfer
of energy through the water piping system. ClimaDry® II simply
diverts condenser water through a water-to-air coil that is
placed after the evaporator coil.
Figure 1 - Typical Hotgas Reheat Circuit
RETURN WATER
LEAVING AIR
(TO WATER LOOP)
WATER
COIL
SUPPLY WATER
CHECK
(FROM WATER LOOP)
VALVE
REVERSING
VALVE
HOTGAS
REHEAT
VALVE
CHECK
VALVE
COMPRESSOR
AIR COIL
TXV
º
CLIMADRY II BENEFITS
ClimaDry® II is like no other reheat option on the market.
Proportional reheat is controlled to the desired leaving air
temperature setpoint (factory setpoint of 72°F) no matter
the water loop temperature. If condenser water is not warm
enough, the internal circulating loop increases the water
temperature with each pass through the condenser coil. Since
dehumidification operation will occur under less than full
load cooling conditions a good percentage of the time, it is
important to have a reheat function that provides 100% reheat
in the spring and fall when the water loop is cool.
Competitors without the ClimaDry® II option typically use an
on/off (non-modulating) refrigeration based reheat circuit,
typically referred to as “Hot Gas Reheat” (HGR). By passing
the hot discharge gas from the compressor through an air
coil, these systems do provide the ability to reheat the leaving
air. However, these systems must rely on complex controls to
operate and contain many additional valves and complex
piping schemes. In addition, the performance of HGR units
typically fluctuates with the outside air temperature and thus
provides a varying amount of dehumidification. Rarely will a
HGR unit provide 100% reheat and provide supply air at a
neutral temperature, like a ClimaDry® II system.
The simplicity of the ClimaDry® II circuit makes it incredibly
easy to maintain. No refrigerant switching valves or hard
to diagnose leaky check valves are utilized. No unusual
refrigerant pressures occur during the reheat mode. There is no
requirement for antifreeze in the reheat circuit.* The refrigerant
circuit is identical to a standard ClimateMaster unit (without
reheat). Plus, the water loop portion of a ClimaDry® II unit is
simple and easy to understand.
ENTERING AIR
Figure 2 - ClimaDry® II Circuit
LEAVING AIR
º
REHEAT
COIL
RETURN WATER (TO WATER LOOP)
SUPPLY
WATER
(FROM
WATER
LOOP)
MODULATING
MIXING
VALVE
INTERNAL
CIRCULATING
PUMP
WATER
COIL
REVERSING
VALVE
COMPRESSOR
TXV
AIR
COIL
º
ENTERING AIR
CLIMADRY® II APPLICATIONS
The ClimaDry® II option can be applied to a number of common
applications, such as:
• Classrooms
• Computer rooms
• Spaces with high latent loads like auditoriums, theaters,
convention centers, etc.
• Most anywhere humidity is a problem
REHEAT FUNCTION
With the ClimaDry® II option, the return air from the
space is conditioned by the air-to-refrigerant (evaporator)
coil, and then reheated by the water-to-air (reheat)
coil to dehumidify the air, but maintain the same space
temperature. The moisture removal capability of the heat
pump is determined by the unit’s latent capacity rating.
UNIT FEATURES
• Fully modulating reheat for precise control of supply
air temperatures
• 100% reheat to operate as a dehumidifier
• “Neutral” 72°F supply air temperature even at part load
(non-design) conditions
• Supply air temperature adjustable from 69°F to 75°F with
optional potentiometer
• Specially designed freeze-resistant reheat circuit does not
require antifreeze*
• Integrated reheat controls - simply attach a humidistat
or dehumidistat
• Microprocessor (DXM) controls standard
• Simple AHRI certified refrigeration circuit
• All water system eliminates refrigeration circuit
modifications (same refrigeration circuit as units without
ClimaDry® II)
• Stable refrigeration pressures, even at low entering
water temperatures
• All components located inside the cabinet
• Two-speed fan (direct drive units) automatically controlled
for increased latent capacity in reheat mode
AVAILABILITY
The ClimaDry® II option is currently available on
ClimateMaster Tranquility® 27 Series, Tranquility® 20 Series,
Tranquility® Large (TL) Series, and Tranquility® TR Series units.
Other units will soon have the ClimaDry® II option available.
*Antifreeze may be required for normal operation
depending on location but not specifically for
ClimaDry® II operation.
Reheat coil reheats
the cool dehumidified
air to “neutral” supply
temperature
Separation between
evaporator coil and reheat
coil to allow maximum
moisture removal
Standard evaporator coil
Modulating mixing
valve automatically
adjusts reheat capacity
based upon leaving air
temperature and loop
entering water temperature
to provide 100% reheat
and “neutral” supply air
Standard DXM control
takes input from
either a humidistat or
dehumidistat and controls
the reheat function by
interfacing with the
modulating reheat valve
U N I T F E AT U R E S
Standard Features
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Tranquility® High Efficiency (TR)
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Tranquility® 16 Compact (TC)
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Tranquility® 22 Compact Two-Stage (TY)
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Tranquility® Vertical Stack (TRM)
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Tranquility® Console (TRC)
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Tranquility® Compact Belt Drive (TC)
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Tranquility® Large (TL)
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Tranquility® Water-to-Water (TMW)
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Rooftop (TRE)
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Rooftop (TRT)
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Rx Energy Recovery Ventilator (ERV)
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Internal Service Disconnect
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vFlow™ Internal Variable Water Flow
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ECM Fan Motor
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ClimaDry® Reheat
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Coated Air Coil
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Internal Secondary Pump
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DDC Controller
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DXM Controller *
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Desuperheater Coil
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Two-Way Control Valve
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Downflow Configuration
High Static Blower
UltraQuiet (Mute) Package
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Auto-Flow Water Regulation
Cupro-Nickel Coil **
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Extended Entering Water
Temperature Insulation ***
Remote Reset at Thermostat
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Factory Installed Hanger Brackets
(Horizontal Units)
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Scroll Compressors
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Multiple Access Panels for
Installation and Service Ease
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Field Convertible Discharge
(Horizontal Units)
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TXV
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Dual Level Compressor
Vibration Isolation
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Copper Water Coil **
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Modulating Water Valve ‡
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ECM Fan Motor
Condensate Overflow Protection
Extended Range Capable Refrigerant
Circuit (20°F to 120°F)
Microprocessor CXM Controls *
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iGate™ Advanced Control
EarthPure® (HFC-410A) Refrigerant
Tranquility® 30 Two-Stage (TT)
Tranquility® 20 Single-Stage (TS)
Product Series
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Factory Installed Options
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Vertical Dedicated Outdoor Air (TOV)
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Horizontal Dedicated Outdoor Air (TOH)
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Some exceptions may apply to standard features and options, consult product submittal materials to determine availability.
Control for TO Series is DDC with modulating HGR. Control for TMW 360-600 is DDC.
Water coil construction for TO Series and TMW 360-600 is stainless steel.
Standard on TMW Series
Extended Range = 35°F–95°F EWT
Low system pressure drop valve is a standard feature, high system pressure drop valve is optional
7300 S.W. 44th Street
Oklahoma City, OK 73179
Phone: 405-745-6000
Fax: 405-745-6058
climatemaster.com
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Certified
Quality: First & Always
ClimateMaster works continually to improve its products. As a result, the design and specifications of each product at the time for order may be changed
without notice and may not be as described herein. Please contact ClimateMaster’s Customer Service Department at 1-405-745-6000 for specific
information on the current design and specifications. Statements and other information contained herein are not express warranties and do not form the basis of any
bargain between the parties, but are merely ClimateMaster’s opinion or commendation of its products.
The management system governing the manufacture of ClimateMaster’s products is ISO 9001:2000 certified.
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© ClimateMaster, Inc. 2010
Rev.: 20 August, 2012