Honeywell T775U Series 2000 Installation Instructions Manual page 30

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
PROGRAM
MOD 1
SP MIN A2
Fig. 69. Program - Sensor A Min. Setpoint.
PROGRAM
MOD 1
RESET B2
Fig. 70. Program - Sensor B Min. Setpoint.
PROGRAM
MOD 1
THROT RNG
Fig. 71. Program - Throttling Range or Differential.
62-0255—07
MENU
3.2.3. SP MIN A2 or BOILER MIN
PROGRAM
MOD 1
SP MIN A2
1. From the menu, use the
light BOILER MIN or SP MIN A2.
2. Press the
3. Use the
160 o
F
desired minimum setpoint temperature.
ENTER
MINIMUM
4. Press the
SETPOINT FOR
ture and display the next option.
SENSOR A
M24574
MENU
3.2.4. RESET B2 or OUTSD MAX
PROGRAM
MOD 1
RESET B2
1. From the menu, use the
light RESET B2.
2. Press the
3. Use the
70
o
F desired setpoint temperature.
ENTER
SENSOR B VALUE
4. Press the
FOR MINIMUM
the next option.
SETPOINT
M24575
MENU
3.2.5. THROTTLING RANGE or
PROGRAM
MOD 1
DIFFERENTIAL
THROT RNG
Throttling Range displays for Modulating outputs.
Differential is used for the Relay outputs.
1. From the menu, use the
light THROT RNG or DIFFERNTL.
20 o
2. Press the
F
value.
3. Use the
ENTER
THROTTLING
desired value.
RANGE FOR
FOR MOD 1
M24577
4. Press the
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.
30
(Setpoint minimum for Sensor A)
and buttons to high-
button to display the setpoint value.
and buttons to increase/decrease the
Default: 140°F (60°C)
Range: -40°F to 248°F (-40°C to 120°C)
button to accept the setpoint tempera-
(Sensor B value when at MIN A2 Setpoint)
and buttons to high-
button to display the setpoint value.
and buttons to increase/decrease the
Default: 60°F (16°C)
Range: -40°F to 248°F (-40°C to 120°C)
button to accept the value and display
and buttons to high-
button to display the throttling range
and buttons to increase/decrease the
Default: 20°F (-6.6°C)
Range: 1°F to 150°F (1°C to 66°C)
button to accept the value and display