Honeywell T775U - Manual (Page 30)

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0255—07 30
Fig. 69. Program - Sensor A Min. Setpoint.
3.2.3. SP MIN A2 or BOILER MIN
(Setpoint minimum for Sensor A)
1. From the menu, use the S and T buttons to high-
light BOILER MIN or SP MIN A2.
2. Press the X button to display the setpoint value.
3. Use the S and T buttons to increase/decrease the
desired minimum setpoint temperature.
Default: 140°F (60°C)
Range: -40°F to 248°F (-40°C to 120°C)
4. Press the X button to accept the setpoint tempera-
ture and display the next option.
Fig. 70. Program - Sensor B Min. Setpoint.
3.2.4. RESET B2 or OUTSD MAX
(Sensor B value when at MIN A2 Setpoint)
1. From the menu, use the S and T buttons to high-
light RESET B2.
2. Press the X button to display the setpoint value.
3. Use the S and T buttons to increase/decrease the
desired setpoint temperature.
Default: 60°F (16°C)
Range: -40°F to 248°F (-40°C to 120°C)
4. Press the X button to accept the value and display
the next option.
Fig. 71. Program - Throttling Range or Differential.
3.2.5. THROTTLING RANGE or
DIFFERENTIAL
Throttling Range displays for Modulating outputs.
Differential is used for the Relay outputs.
1. From the menu, use the S and T buttons to high-
light THROT RNG or DIFFERNTL.
2. Press the X button to display the throttling range
value.
3. Use the S and T buttons to increase/decrease the
desired value.
Default: 20°F (-6.6°C)
Range: 1°F to 150°F (1°C to 66°C)
4. Press the X button to accept the value and display
the next option.
The Throttling Range brackets the setpoint setting, e.g., if
the setpoint is 72°F and the throttling range is 10°F, then
the effective throttling temperature range is 67°F to 77°F.
In heating mode, the Differential is below the setpoint.
The relay de-energizes when the temperature rises to the
setpoint. As the temperature drops to the setpoint minus
the Differential, the relay energizes.
In cooling mode, the Differential is above the setpoint.
The relay de-energizes when the temperature falls to the
setpoint. As the temperature rises to the setpoint plus the
Differential, the relay energizes.
ENTER
MINIMUM
SETPOINT FOR
SENSOR A
PROGRAM
MOD
1
SP MIN A2
MENU
PROGRAM
MOD 1
SP MIN A2
160 F o
M24574
ENTER
SENSOR B VALUE
FOR MINIMUM
SETPOINT
PROGRAM
MOD
1
RESET B2
MENU
PROGRAM
MOD 1
RESET B2
70 F o
M24575
ENTER
THROTTLING
RANGE FOR
FOR MOD 1
PROGRAM
MOD
1
THROT RNG
MENU
PROGRAM
MOD 1
THROT RNG
20 F o
M24577