Honeywell T775A Benutzerhandbuch

7

63-2489—2

The T775AC operate with one temperature input supplied by 

the remote sensor while T775B,D have two temperature 

inputs. The T775A,B,C,D are all capable of providing up to four 

stages of on/off control relay outputs. Each controller stage has 

its own independent setpoint that can be configured to operate 

in either the heating or cooling mode. The mode of operation 

for each stage is user-determined by programming keys.

• Relay outputs energize at the temperature setpoint minus 

the differential value.

• Relay outputs de-energize at the temperature setpoint 

value.

• Relay outputs energize at the temperature setpoint plus 

differential value.

• Relay outputs de-energize at the temperature setpoint 

value.

EXAMPLE
Using a device with one input and one relay output, the 

corresponding load energizes at the following temperatures 

based on the initial settings:

• Setpoint: 68°F

• Differential: 2°F

Outputs Energized
Heating Mode: Stage One energizes at 66°F.

Cooling Mode: Stage One energizes at 70°F.

The T775B,D have dual sensor inputs and allow two separate 

controllers to exist within one enclosure. Selection of the stage 

parameters (operation mode, setpoints, and differentials) is the 

same as for a single sensor device after each stage is 

assigned its operating sensor. This assignment is hardware 

driven via a four position DIP switch. An explanation of the DIP 

switch assignments appears in Fig. 9. See Fig. 3 and 4 for the 

DIP switch location.

The two-terminal input allows the user to override a relay-

energized condition on all outputs. This is done using contact 

closure between terminal pins 3 and 4 (TOD). (See Fig. 3 and 

4 for location.) This can be achieved manually or by using an 

EMS controller or time clock with normally open contacts 

(W7505 or S7005, for example).

When this override is active:

— The display shows the number of stages that would be 

energized

— The words STAGE ENERGIZED flash on the display.

— Energized stages de-energize until the override returns to 

inactive (Off).

A single jumper plug controls °F/°C indication of the displayed 

temperature value. See Fig. 3 and 4 for the location of this 

jumper. The unit ships with the jumper installed in the °F mode. 

To operate the device in the °C mode, remove the jumper. 

Replacing the jumper reinstates the °F mode.

NOTES: If, upon removing the jumper plug, the device does 

not display °C:

—

Remove power from the device.

—

Replace power to the device.

On the T775B,D, DIP switches are provided for assignment of 

each relay output stage to its operating sensor. If an individual 

switch is depressed to the right—toward its corresponding load 

number (1 through 4 on DIP switch)—Sensor B is the 

controlling sensor for that output stage. If an individual switch 

is depressed to the left, Sensor A is the controlling sensor for 

the output stage. An example of the switches and their 

corresponding positioning is shown in Fig. 9.

1. Determine loads to be controlled and the operating mode 

(heat or cool) and enter them in the Device Programming 

Worksheet (Table 2).

SetPt 1

On at

Diff 1

Off at

SetPt 2

On at

Diff 2

Off at

SetPt 3

On at

Diff 3

Off at

SetPt 4

On at

Diff 4

Off at

M3292

LOAD 1 IS CONTROLLED BY 
SENSOR A WHEN SWITCH IS 
DEPRESSED ON THE LEFT

LOAD 2 IS CONTROLLED BY 
SENSOR B WHEN SWITCH IS 
DEPRESSED ON THE RIGHT 
(AS SHOWN)

SENSOR A

SENSOR B

LOAD 1

LOAD 2

SIDE VIEW

A

B

SWITCH

SWITCH

PWB

PWB