Honeywell T7350 Benutzerhandbuch

63-2605—5

22

Dehumidification (T7350D,M,H only)

There are five methods through which the T7350 can control 

for dehumidification. Three of them modify the control 

algorithm, thus providing limited dehumidification through 

cooling. The other two use the auxiliary output to control 

another device.

NOTE: The dehumidification high limit can be set within the 

range of 10 to 90 percent relative humidity.

Configure using some combination of the following:

— Minimum On.

— Reheat.

— Reset.

NOTES:

—

These methods operate only during cooling.

—

Selecting both Reheat and Reset can cause 

frequent setpoint adjustments. This selection 

is not recommended.

MIN ON TIME
Dehumidifies by increasing the compressor minimum on time 

(normally 3 minutes) by a programmable amount. This is 

useful with oversized systems in that it forces the coils to cool 

to a point where dehumidification can occur.

NOTES:

—

Can force wider temperature swings by cooling 

when setpoint control does not require it.

—

The minimum on time can be set within the range 

of 5 to 15 minutes.

—

Hysteresis and a minimum timer are used to 

ensure this behavior does not change with every 

equipment cycle.

REHEAT
Dehumidifies by operating cooling during typical off time. The 

T7350 maintains the proper setpoint by running the heat at the 

same time.

NOTES:

—

The heat stage never energizes during Reheat if 

more than one cool stage is on.

—

Reheat mode cannot occur during heating.

—

The T7350H1017, T7350M do not support the 

Reheat method.

RESET TEMP SETPT
The room temperature set point resets to a specified number 

of degrees below the actual set point when room relative 

humidity (RH) rises above humidity high limit.

Though this may not technically reduce RH, it reduces the 

dew point to provide the customer with a sense of comfort due 

to a lower temperature setting in the room.

As long as RH stays above humidity high limit, this set point is 

maintained.

NOTE: Hysteresis and a minimum timer prevent the set 

point from short interval alternation (between stan-

dard and reset set points).

There are two dehumidification options that utilize the 

auxiliary output. They are:

— Simple Dehumidification.

— Hot Gas Bypass Dehumidification.

SIMPLE DEHUMID(IFICATION)
The auxiliary output:

— Energizes when RH rises above humidity high limit.

— De-energizes when RH drops below humidity high limit.

NOTES:

—

Hysteresis and a minimum timer prevent short 

cycling of this output.

—

Unlike Dehumid Hot Gas BP the relay remains 

energized during calls for multiple cooling stages.

DEHUMID HOT GAS BP
The auxiliary output operates as shown in Table 18.

Auxiliary output during call for multiple cooling stages for two 

reasons:

1. This method assumes that the cooling provides dehu-

midification.

2. Multiple cooling stages probably provide necessary 

dehumidification.

NOTE: Hysteresis and a minimum timer prevent short 

cycling of this output.

High

more than one

De-energized

High

one or less

Energized

Low

more than one

De-energized

Low

one or less

De-energized