Honeywell T755U User Manual
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0255—09
30
CAUTION
If using the time clock or DI to go to setback,
the T775P will shift the reset curve up or down
and cause the controlled setpoint to exceed
either the entered reset max. temp or min.
temp (dropping below reset minimum is most
common, since setback is normally below
setpoint). If this is not desired, either do not
use setback, or adjust the min. and max.
values entered so that critical setpoints are
not exceeded in the setback mode.
When Reset is programmed, the home screen displays
the calculated Heat/Cool setpoint(s) for the Mod and
Relay outputs based on the reset curve. See Fig. 22 on
Fig. 66. Reset Curve for MOD 1 with Setback Offset.
Fig. 67. Setpoint Values for Reset and Setback.
3.2. Program Menus for Outputs with
Reset
Press the MENU button, select PROGRAM, then highlight
MOD 1 and press the u button to view the parameters.
The Reset curve settings (Fig. 68 through Fig. 71) are
The Reset curve settings (Fig. 68 through Fig. 71) are
programmed for the first output (MOD 1) and these
settings apply to all outputs that are configured for Reset.
See Fig. 66 for the reset curve values used in the
following section.
NOTE: The Setback parameter displays only if
scheduling is enabled (see Fig. 48 on
page 22) or the DI Option is set to Setback
(see Fig. 50 on page 24).
Fig. 68. Program - Sensor A Max. Setpoint.
3.2.1. SP MAX A1 or BOILER MAX
(Setpoint maximum for Sensor A)
1. From the menu, use the p and q buttons to highlight
BOILER MAX or SP MAX A1.
2. Press the u button to display the maximum setpoint
value.
3. Use the p and q buttons to increase/decrease the
desired maximum setpoint temperature.
Default: 180°F (82°C)
Range: -40°F to 248°F (-40°C to 120°C)
4. Press the u button to accept the setpoint tempera-
ture and display the next option.
Fig. 69. Program -Sensor B Max. Setpoint.
SENSOR B
SP MAX A1
(BOILER MAX)
SP MIN A2
(BOILER MIN)
200
140
10
SETBACK
OFFSET
-10°F
190
20
30
40
50
60
70
°F
80
150
160
170
210
220
180
°F
RESET B1
(OUTSD MIN)
RESET B2
(OUTSD MAX)
S
E
N
S
O
R
A
M24570
SP MAX A1
RESET B1
SP MIN A2
RESET B2
THROT RNG
ACTION
SETBACK
EXIT
OR
PROGRAM
MOD 1
MENU
PROGRAM
MOD 1
BOILR MAX
OUTSD MIN
BOILR MIN
OUTSD MAX
THROT RNG
ACTION
SETBACK
EXIT
MENU
PROGRAM
MOD 1
MOD 1 RESET:
YES-OTHER AND
DI OPTION = SETBACK
MOD 1 RESET:
YES-BOILER AND
DI OPTION = SETBACK
M24571
ENTER
MAXIMUM
SETPOINT FOR
SENSOR A
PROGRAM
MOD
MOD
1
SP
MAX
A1
MENU
PROGRAM
MOD 1
SP MAX A1
210
F
o
M24572
ENTER
SENSOR B VALUE
FOR MAXIMUM
SETPOINT
PROGRAM
MOD
MOD
1
RESET B1
MENU
PROGRAM
MOD 1
RESET B1
20
F
o
M24573