Specifications

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LC377 - 41
TS Series 60Hz - HFC-410A Submittal Data Eng/I-P
Revised: 17 July, 2013
Page ______ of ______
1st Stage Heating: A simultaneous call from (G) and (Y1)
to the (G) and (Y1) terminals of the DXM control board
will bring the unit on in 1st Stage Heating.
2nd Stage Heating: A simultaneous call from (G), (Y1),
and (Y2) to the (G), (Y1), and (Y2) terminals of the
DXM control board will bring the unit on in 2nd Stage
Heating. When the call is satisfied at the thermostat
the unit will continue to run in 1st Stage Heating until
the call is removed or satisfied, shutting down the
unit. NOTE: Not all units have two-stage heating
functionality (e.g. TLV084-150 units).
Reheat Mode: A call from the Humidistat/Dehumidistat
to the (H) terminal of the DXM control board will
bring the unit on in Reheat Mode if there is no call
for cooling at the thermostat. When the Humidistat/
Dehumidification call is removed or satisfied the unit
will shut down. NOTE: Cooling always overrides
Reheat Mode. In the Cooling mode, the unit cools
and dehumidifies. If the cooling thermostat is
satisfied but there is still a call for dehumidification,
the unit will continue to operate in Reheat Mode.
Note: Care must be taken when using a humidistat
to operate ClimaDry
®
. When the DIP switch on the
DXM controller is set for ‘humidistat’ it reverses
the control logic so that an “open” control circuit
initiates a ClimaDry
®
run cycle. If a humidistat
is not connected, or if a manual switch on the
humidistat is set to “off”, ClimaDry
®
will see the
open circuit and call for dehumidification.
ClimaDry
®
II Component Functions
The ClimaDry
®
II option consists of the following
components:
Motorized Valve/Proportional Controller
Supply Air Sensor
Loop Pump
Hydronic Coil
Low Air Temperature Switch
The Proportional Controller operates on 24 VAC
power supply and automatically adjusts the water
valve based upon the Supply Air Sensor. The Supply
Air Sensor senses supply air temperature at the blower
inlet providing the input signal necessary for the
proportional control to drive the motorized valve during
the reheat mode of operation. The Motorized Valve is
a proportional actuator/three-way valve combination
used to divert the condenser water from the coax
to the hydronic reheat coil during the reheat mode
of operation. The proportional controller signals the
motorized valve based on the supply air temperature of
the supply air sensor.
ClimaDry
®
II Option - Sequence of Operation
The Loop Pump circulates condenser water through
the hydronic reheat coil during the reheat mode of
operation. In this application, the loop pump is only
energized during the reheat mode of operation. The
Hydronic Coil is utilized during the reheat mode of
operation to reheat the air to the setpoint of the
proportional controller. Condenser water is diverted by
the motorized valve and pumped through the hydronic
coil by the loop pump in proportion to the control
setpoint. The amount of reheating is dependent on
the setpoint and how far from setpoint the supply air
temperature is. The factory setpoint is 72°F [22°C],
generally considered “neutral” air.
ClimaDry
®
II Application Considerations
The reheat coil adds a small amount of resistance to the
air stream. In some cases the high static option may be
required for applications with higher static ductwork.
Consult the submittal data or the Installation/Operation/
Maintenance (I.O.M.) manual for the specic heat pump
to review blower tables.
Unlike most hot gas reheat options, the ClimaDry
®
II
option will operate over a wide range of EWTs. Special
ow regulation (water regulating valve) is not required for
low EWT conditions.
Unit minimum entering air temperature while in the
dehumidication, cooling, or continuous fan modes is
65ºF DB/55ºF WB. Operation below this minimum may
result in nuisance faults.
Water-source heat pumps with ClimaDry
®
II should
not be used as make-up air units. These applications
should use equipment specically designed for
make-up air.