Honeywell T775 Series 2000 - Reset Programming (T775 L, T775 P, T775 R, and T775 U models only); Setback (Optional) Description

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T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS

7 63-7147—05

Reset Programming (T775L, T775P,

T775R, and T775U models only)

To program an output for reset, refer to the values as shown in

the example below and in Fig. 1. Choose your own

appropriate values for Sensor A maximum and minimum and

Sensor B maximum and minimum.

Reset Example:

• Sensor A is the boiler sensor and Sensor B is the

outdoor sensor.

• Maximum boiler temperature desired is 210° F (99° C)

when the outdoor temperature is 20° F (-7° C).

• Minimum boiler temperature desired is 160° F (71° C)

when the outdoor temperature is 70° F (21° C).

With the above settings example, when the outdoor

temperature is 50° F (10° C), the effective setpoint is 180° F

(82° C).

Setpoint Offset

NOTE: The Setpoint Offset is used for subsequent

outputs only.

This value is the number of degrees plus (+) or minus (-) that

you want the temperature to be offset from the first output’s

setpoint. See Fig. 1. For example, If you want the second

output setpoint to be 10° F (-12° C) less than the first output

setpoint, enter -10° F (-23° C).

Fig. 1. Reset curve with offset for subsequent outputs.

The reset curve established when programming the first

output (Fig. 1) is then used for all subsequent outputs that are

configured for Reset = YES, and each of those outputs will be

offset from this curve.

Choose Reset = NO for any outputs you do not wish to reset,

then press the HOME button to record your selection.

NOTES:

1. A single reset curve is programmed for the first

output and is used by all outputs setup for Reset.

2. For subsequent outputs, a setpoint offset is used

if that output is also being Reset.

When Reset is programmed, the home screen conveniently

displays the calculated Heat/Cool setpoint(s) for the outputs

based on the reset curve.

Setback (Optional) Description

The Setback temperature option is available only if scheduling

is enabled or the Digital Input Option is set to Setback.

This value is the number of degrees plus (+) or minus (-) that

you want the temperature to be setback (offset) from the

setpoint at a predetermined time.

For example, if you want the temperature to be 10° F (-12° C)

less than the setpoint during setback mode, enter -10° F

(-23° C). See Fig. 2.

In normal operations for heating, the offset will be a negative

value; for cooling, the offset will be a positive value.

Setback (optional) Example:

Setback of -10° F (-23° C) is used to drop the temperature at

night by 10° F (-12° C).

With the above settings example, when the outdoor

temperature is 50° F (10° C), the effective setback setpoint is

170° F (77° C) 180° F (82° C) setpoint minus the 10° F

(-12° C) setback).

Fig. 2. Reset curve for first output with setback offset.

SENSOR B

SP MAX A1

(BOILER MAX)

SP MIN A2

(BOILER MIN)

200

140

RELAY 2

SETPOINT

OFFSET

-10°F

190

30 40 50 60

°F80

150

160

170

210

220

180

°F

RESET B1

(OUTSD MIN)

RESET B2

(OUTSD MAX)

M24862

RELAY 1