ClimaDry Sequence Of Operation

A heat pump equipped with ClimaDry can operate in three modes; cooling, cooling with reheat, and heating. The cooling/heating modes are like any other ClimateMaster WSHP. The reversing valve (“O” signal) is energized in cooling, along with the compressor contactor(s) and blower relay. In the heating mode the reversing valve is de-energized. Almost any thermostat will activate the heat pump in heating or cooling modes. The DXM microprocessor board, which is standard with the ClimaDry option, will accept either heat pump (Y,O) thermostats or non-heat pump (Y,W) thermostats (see CXM/DXM AOM for detailed DXM information).

The reheat mode requires either a separate humidistat/ dehumidistat or a thermostat that has an integrated dehumidification function for activation. The DXM board is configured to work with either a humidistat or dehumidistat input to terminal “H” (DIP switch settings for the DXM board are shown below in table 2). Upon receiving an “H” input, the DXM board will activate the cooling mode and engage reheat. Table 3 shows the relationship between thermostat input signals to the DXM board and unit operation.

There are five operational inputs for single stage units and seven operational inputs for two stage units: -Fan Only

-1st Stage Cooling

-2nd Stage Cooling

-1st Stage Heating

-2nd Stage Heating

-3rd Stage Heating (If applicable) -Reheat Mode

Fan Only: A (G) call from the thermostat to the (G) terminal of the DXM control board will bring the unit on in fan only mode.

1st Stage Cooling: A simultaneous call from (G), (Y1), and (O) to the (G), (Y1), (O/W2) terminals of the DXM control board will bring the unit on in 1st Stage Cooling.

Table 2: Humidistat/Dehumidistat Logic and DXM 2.1, 2.2., 2.3 DIP settings

Sensor

2.1

2.2

2.3

Logic

Reheat (ON) - H

Reheat (OFF) - H

 

 

 

 

 

 

 

Humidistat

OFF

OFF

OFF

Reverse

0 VAC

24 VAC

 

 

 

 

 

 

 

Dehumidistat

OFF

ON

OFF

Standard

24 VAC

0 VAC

Table 3: ClimaDry Operating Modes

 

 

 

 

Input

 

 

 

 

 

Output

 

 

Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

G

Y1

 

Y23

W

H

O

G

Y1

 

Y23

Backup

Reheat

 

 

 

 

 

 

Elec Heat

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No Demand

ON/OFF5

OFF

OFF

 

OFF

OFF

OFF

ON/OFF5

OFF

OFF

 

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan Only

ON/OFF5

ON

OFF

 

OFF

OFF

OFF

ON/OFF5

ON

OFF

 

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling 1st Stage

ON

ON

ON

 

OFF

OFF

OFF

ON

ON

ON

 

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling 2nd Stage

ON

ON

ON

 

ON

OFF

OFF

ON

ON

ON

 

ON

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling & Dehumidistat1

ON

ON

ON

 

ON/OFF5

OFF

ON

ON

ON

ON

 

ON/OFF5

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidistat Only

ON/OFF5

OFF

OFF

 

OFF

OFF

ON

ON

ON

ON

 

ON

OFF

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating 1st Stage

OFF

ON

ON

 

OFF

OFF

OFF

OFF

ON

ON

 

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating 2nd Stage

OFF

ON

ON

 

ON

ON/OFF5

OFF

OFF

ON

ON

 

ON

ON/OFF5

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating 3rd Stage4

OFF

ON

ON

 

ON

ON4

OFF

OFF

ON

ON

 

ON

ON4

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heating & Dehumidistat2

OFF

ON

ON

 

ON/OFF5

ON/OFF5

ON

OFF

ON

ON

 

ON/OFF5

ON/OFF5

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1Cooling input takes priority over dehumidify input.

2DXM is programmed to ignore the H demand when the unit is in heating mode.

3N/A for single stage units; Full load operation for dual capacity units.

4Single stage unit: W = 2nd Stage backup elec. heat; Two-Stage units: W = 3rd stage backup elec. heat. 5ON/OFF = Either ON or OFF.

ClimaDry Whole House Dehumidification - ClimateMaster Geothermal Heat Pumps - Rev.: 18 April, 2008B

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Toshiba TRANQUILITY 20, TRANQUILITY 27 manual ClimaDry Sequence Of Operation, ClimaDry Operating Modes

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