Install Instructions

T775R SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0249—05 12
Adjust the setpoint (at any output) to the desired
maximum setpoint. Then, simultaneously press the
HOME, W, and X buttons and continue to press all three
buttons for five seconds to set the setpoint high limit
maximum to this value.
NOTE: You must press all three buttons at exactly the
same time for this action to occur.
IMPORTANT
1. This action sets the maximum setpoint value of
all outputs to the setpoint high limit maximum.
2. Setting the high limit setpoint maximum is
irreversible. If you perform the action
inadvertently and this setpoint adversely affects
the control of your system, you must replace the
controller.
Programming the T775R Controller
To program the controller, select one of the following
procedures depending on whether the Reset function is to
be used:
• Program Outputs for Reset — See “1. Programming
Outputs (Relay and Mod) with Reset” on page 12
• Program Outputs for No Reset — Refer to “2.
Programming Outputs (Relay and Mod) with No Reset”
on page 16
When programming is complete, you may continue with
“4. Scheduling” on page 31 or, for advanced options,
continue with “3. Setup (Advanced Options)” on page 19.
1. PROGRAMMING OUTPUTS
(RELAY AND MOD) WITH RESET
The T775R can be programmed for Reset or No Reset for
each output. From the factory, the T775R is programmed
for No Reset. This section describes the steps necessary
to program the controller for Reset.
To use the Reset feature, the first output (MOD 1 or Relay
1 depending on the model) must be set to Reset=YES in
Setup mode (See “1.1. Setting Up the Controller for
Reset”).
The reset curve established when programming the first
output (MOD 1) is then used for all subsequent outputs
that are configured for Reset, and each of those outputs
will be offset from this curve.
For all outputs that will follow a reset curve, be sure to
configure for Reset=YES in the setup mode. Choose
Reset YES or NO for all other outputs you wish to reset,
then press the HOME button to record your selection.
Fig. 24. Reset Setup.
1.1. Setting Up the Controller for Reset
1. Press and hold the MENU button for five seconds to
enter Setup mode.
2. Then choose:
OUTPUTS X
RELAY 1 (or MOD1 if Mod outputs present) X
RESET X
then select YES -BOILER or YES-OTHER (Fig. 24).
You can now press the HOME button to exit Setup mode
and continue with “Determining and Setting the Reset
Values”.
Determining and Setting the Reset Values
NOTE: When using the Reset feature, Sensor A must
be sensing the controlled temperature (e.g.
Boiler), Sensor B must be sensing the resetting
temperature (e.g. outdoor temp).
To program an output for Reset, refer to the values as
shown in the examples below and in Fig. 25 on page 13.
Choose your own appropriate values for Sensor A
maximum and minimum and Sensor B maximum and
minimum.
Reset Example: (Refer to Fig. 25 on page 13)
• 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).
Setback (optional) Example: (Refer to Fig. 25 on
page 13)
• Setback of -10° F (-12° 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).
NOTE: A single reset curve is programmed for the first
output and is used by all outputs setup with
RESET=YES.
NOTE: For subsequent outputs (MOD and Relay), a
setpoint offset is used if that output is also being
Reset. Refer to “1.2.9.1 SETPOINT OFFSET
(subsequent outputs only)” on page 16.
When Reset is programmed, the home screen
conveniently displays the calculated Heat/Cool setpoint(s)
for the Mod and Relay outputs based on the reset curve
(Refer to Fig. 21 on page 10).
SETUP
OUTPUTS
RELAY 1 (or MOD1)
RESET
SETUP
OUTPUTS
RELAY 1
RESET
USE
RESET
FOR
RELAY 1
YES-BOILER
YES-OTHER
NO
M24303