Technician Setup Menu
Technician Setup Menu
Tech Setup Steps
Adjustment Options
Default
LCD Will Show
26
27
28
25
Technician Setup Menu
Technician Setup Menu
Tech Setup Steps
Adjustment Options
Default
LCD Will Show
Tech Setup Steps
Adjustment Options
Default
LCD Will Show
Balance point run time will allow
the W2 auxiliary terminal to ener-
gize even if outdoor temperature
is above selected balance point
temperature. If enabled, auxiliary
will energize for the current cycle
after the balance point run time
has expired.
Note: Only shows if Balance Point is
set to an outdoor temperature.
Balance
Point Run
Time
(Only displayed
if remote sensor
setting is set
to 2)
This feature will bring in outside
air for first stage cooling opera-
tions, if the outdoor temperature
is 5 (or more) degrees lower than
the setpoint temperature. This
setting can only be enabled if the
thermostat is in cooling mode.
Free Cooling
(Only displayed
if remote sensor
setting is
set to 2)
Off, 15, 30, 45, 60, 75, 90
BP RUN TIME
Use the and buttons
to select ON/OFF.
OFF
This setting provides the option to
select a terminal for Free Cooling
functions. The selected terminal
cannot be used for reversing valve
operations when the heat pump
setting is turned on.
Use the and buttons
to select O/B.
O
FREE COOLTRM
OF
O
This setting allows you to set
a maximum floor temperature
limit for heat. Heat will be locked
out when the floor temperature
is above this value. Note: Only
shows when REOP is set to 3.
Floor High
Limit
(Only displayed
if remote sensor
setting is set
to 3)
This setting allows you to set
a minimum floor temperature
limit for heat. Heat will turn on
automatically when the floor
temperature is below this value.
Note: Only shows when REOP is
set to 3.
Floor Low
Limit
(Only displayed
if remote sensor
setting is set to 3)
Use the or buttons to
select the High Limit for the
floor sensor.35 - 120
HIGH LIMIT
Use the or keys to
select the Low Limit for the
floor sensor.
35 - 120
50
86
86
50
LOW LIMIT
OF
OFF
FREE COOLING
The temperature of the floor
sensor will be displayed.
Note: Only shows when REOP is
set to 3.
Use and buttons to adjust.
N/A
N/A
76
FLOOR TEMP
You can disable the sensor on
the T855SH thermostat. At least
one R251S indoor remote sensor
must be connected to disable the
local T855S sensor. Note: Will only
show if remote sensor is set to 1.
Local Temp
Sensor
(Only displayed
if remote sensor
setting is set to 1)
ON enables local T855SH
sensor. OFF disables local
T855SH sensor.
ON
LOCAL TEMP
Enables the use of up to sixteen
indoor sensors R251S. Note: Will
only show Remote Sensor is set
to 1 and Local Temp Sensor is
set to on.
Number
of Indoor
Remotes
(Only displayed
if remote sensor
setting is set to 1)
You can use 1, 4, 9, or 16
indoor sensors. Refer to the
R251S Install Manual for de-
tailed connection information
1
NUMBER REMOTE
1
An outdoor temperature above
balance point will cause the
thermostat to energize the Y
terminal(s) only in calls for heat.
An outdoor temperature below
balance point will cause the
thermostat to energize the W2
terminal only in calls for heat.
Dual Fuel
Balance
Point
(Only displayed
if remote sensor
setting is set to
2 and Dual Fuel
AUX = On)
Use the and buttons
to select OFF, 10, 15, 20, 25,
30, 35, 40, 45, 50 degrees.
OFF
BALANCE POINT
OF
Balance point with electric
auxiliary will optimize heat
pump usage. When the outdoor
temperature is above the AUX CUT
OUT selection, the thermostat
to only allow the Y terminal(s)
will energize and lockout the W2
terminal. When the outdoor
temperature falls below the
AUX CUT OUT selection and sits
above the AUX CUT IN selection,
the thermostat will allow the Y
terminal(s) and the W2 terminal
to energize. When the outdoor
temperature is below the AUX
CUT IN selection, the thermostat
will only energize the W2 termi-
nal and lockout the Y terminal(s).
Balance Point
Electric AUX
Cut Out
(Only displayed if
remote
sensor setting is
set to 2 and Duel
Fuel Aux if Off)
Use the and buttons
to select 10, 15, 20, 25, 30,
35, 40, 45, 50 degrees.
OFF
40
AUX CUT OUT
Balance point with electric
auxiliary will optimize heat
pump usage. When the outdoor
temperature is above the AUX CUT
OUT selection, the thermostat
to only allow the Y terminal(s)
to energize and lockout the W2
terminal. When the outdoor
temperature falls below the
AUX CUT OUT selection and sits
above the AUX CUT IN selection,
the thermostat to allow the Y
terminal(s) and the W2 terminal
to energize. When the outdoor
temperature below the AUX CUT
IN selection, the thermostat will
only energize the W2 terminal
and lockout the Y terminal(s).
Balance Point
Electric AUX
Cut In
(Only displayed if
remote
sensor setting is
set to 2 and Duel
Fuel Aux if Off)
Use the and buttons
to select 10, 15, 20, 25, 30,
35, 40, 45, 50 degrees.
OFF
40
AUX CUT IN
Tech Setup Steps
Adjustment Options
Default
LCD Will Show
You can configure the thermostat
for one of three remote sensor
applications: 0 No Sensor, 1
Indoor, 2 Outdoor, 3 Floor.
Remote
Sensor
Operation
(Only displayed
if a sensor is
connected
to S1 and S2
terminals)
REMOTE MODE
0
0
Use the left and right
arrows to select one of three
options. View the S1/S2
terminal chart on next page
for an explanation of these
options.
S1 / S2 Terminal
Options Mode
Description
Requires
1
2
3
Indoor
Outdoor
Floor
The local and remote temperatures are averaged.
The outdoor temperature is flashed in clock.
The floor temperature is shown in tech.
R251S
R250S
R250S
This feature allows fresh air into
a unit for a selectable amount
of time. When Fresh Air Mode is
enabled, the fan and the fresh air
damper terminal will energize
simultaneously.
Use the and buttons to
select OFF, OC ON or ON.
OFF: Thermostat does not
enable Fresh Air Mode.
OC ON: Fresh Air Mode is
enabled during the OCCUPIED,
WAKE, RETURN, and SLEEP
time periods (It will not bring
in fresh air during UNOCCUPIED
and LEAVE time periods).
ON: Thermostat will enable
Fresh Air Mode for every time
periods.
OFF
FRESH AIR
OF
This setting provides the option
to select a terminal for Fresh Air
damper functions. The selected
terminal cannot be used for
reversing valve operations when
the heat pump setting is turned
on.
Fresh Air
Terminal
(Only displayed
if fresh air mode
is turned ON.
This setting
cannot be used
with PTAC, three
stages of cool,
or economizer
turned ON.)
Use the and buttons
to select O/B.
FRESH AIR TRM
0
O
Fresh Air
Mode
(This setting
cannot be used
with PTAC, three
stages of cool,
or economizer
turned on)
Floor
Temperature
(Only displayed
if remote sensor
setting is set to 3)
Free Cooling
Terminal
(Fresh air
mode and free
cooling can be used
together. Free
cooling cannot be
used with PTAC
mode, three stages
of heat, or
economizer mode)
