Pro1 Technologies T721i Installation Manual page 2

Wiring
Power Supply
1
Factory-installed jumper,
2
remove only when installing on 2-transformer system.
Use either O or B terminals for changeover valve.
3
A 24 VAC 500mA common connection is required with this thermostat.
4
Typical 1H/1C system: 1 transformer
4
Typical 1H/1C heat pump system
2
1
4
3
Typical heat only system
2
4
5
Technician Setup Menu
To enter tech setup:
1. Press and hold the + and - buttons for 3 seconds.
2. Press and hold the TECH button.
3. Configure the installer options as desired using the table below. Use the + or - buttons to
change settings and the PREV and NEXT buttons to move from one step to another.
4. To exit tech setup: press and hold the + and - buttons for 3 seconds, or wait 20 seconds.
Tech Setup Steps
This feature allows the installer to
Room
change the calibration of the room
Temperature
temperature display. For example, if the
thermostat reads 70 degrees and you
Calibration
would like it to read 72 then select +2.
The compressor short cycle delay
protects the compressor from "short
Compressor
cycling". This feature will not allow
Short Cycle
the compressor to be turned on for 5
Delay
minutes after it was last turned off.
The swing setting often called "cycle
rate", "differential", or "anticipation" is
adjustable. A smaller swing setting will
Cooling
cause more frequent cycles and a larger
Swing
swing setting will cause fewer cycles.
The swing setting often called "cycle
rate", "differential", or "anticipation" is
adjustable. A smaller swing setting will
Heating
cause more frequent cycles and a larger
Swing
swing setting will cause fewer cycles.
When set to ON this thermostat
will operate a heat pump system
(default). If set to OFF this
Heat Pump
thermostat will operate a
conventional system, and the next
tech step will not appear.
When set to ON, this setting will
Emergency
enable Emergency Heat in Heat
Heat
Pump mode.
(Only displayed if Heat
Pump is set to ON.)
Swing Setting Tip
Temperature swing, sometimes called differential or cycle rate, can be
customized for this individual application. For most applications choose a swing
7
setting that is as wide as possible without making the occupants uncomfortable.
Typical 1H/1C system: 2 transformers
4
Typical heat only systems w/o fan
4
Typical cool-only sytem
2
1
4
LCD Will Show Adjustment Options
CALIBRATE You can adjust the room
temperature display to read
0
4˚above or below the factory
calibrated reading.
COMP DELAY Selecting "ON" will not allow
the compressor to be turned
0N
on for 5 minutes after the
last time the compressor was
switched off. Select "OFF" to
remove this delay.
The cooling swing setting is
COOL SWING
adjustable from 0.2˚ to 2˚. A
swing setting of 0.5˚will begin
cooling at approximately 0.5˚
above the setpoint and stop
approximately 0.5˚ below the
setpoint.
The heating swing setting is
HEAT SWING
adjustable from 0.2˚ to 2˚. A
swing setting of 0.5˚will begin
heating at approximately 0.5˚
below the setpoint and begin
approximately 0.5˚ above the
setpoint.
ON - Configured to operate
HEAT PUMP
heat pump system.
OFF - Configured to operate
conventional system
See page 5 for terminal
designations.
HEAT PUMP ON - Enables Emergency
Heat
OFF - Disables Emergency
Heat.
Tech settings continued on next page ...
Wiring
Replacement Thermostat Wiring
1.
If you are replacing a thermostat, make
note of the terminal connections on the
thermostat that is being replaced. In some
cases the wiring connections will not be
color coded. For example, the green wire
may not be connected to the G terminal.
2.
Loosen the terminal block screws. Insert
wires then retighten terminal block screws.
3.
Place nonflammable insulation into wall
opening to prevent drafts.
4.
This thermostat requires a 24V common
wire to the C terminal.
Installation Tip
Do not overtighten terminal block screws, as this can damage the terminal block.
A damaged terminal block can keep the thermostat from fitting on the subbase
correctly or cause system operation issues.
Wiring Chart
For all systems, the following terminals are wired according to whether you have a
single or dual transformer system as shown:
SINGLE
TRANSFORMER
SYSTEM
DUAL
TRANSFORMER
SYSTEM
*FAILURE TO REMOVE PROVIDED JUMPER ON DUAL TRANSFORMER INSTALLATIONS COULD CAUSE SEVERE DAMAGE TO HVAC SYSTEMS
O Terminal
B Terminal
1
Note: Devices such as a float switch that mechanically break circuits should be installed
so that they break the control wire (Y) not the power (R). Interrupting the power circuit
will shut off power to the thermostat completely and not allow it to operate.
If using in Heat Pump without Auxiliary or Emergency heat application,
please see wiring diagram on previous page.
Technician Setup Menu
Tech Setup Steps
This feature controls the number
Emergency
of stages in Emergency Heat
Heat Stages
mode. It only appears if the
Technician Setup Step for HEAT
(Only displayed if Emergency
PUMP is ON.
Heat is set to ON)
Default
For Dual Fuel applications (Gas/
Dual Fuel
Fossil fuel Auxiliary Heat), turn
Auxiliary for
this setting ON to LOCKOUT the
Heat Pump
Heat Pump (Y) when Auxiliary
O
Heat (W2) is on.
(Only displayed if Heat Pump
is set to ON) also be used with Electric Auxiliary.
This feature allows the thermostat
to keep multiple stages of heat
Satisfy
energized until setpoint is
Setpoint
ON
satisfied.
This feature allows a delay to occur
when a second stage is needed.
Staging
This allows the previous stage
Delay
extra time to satisfy setpoint.
0.5 ˚F
This feature allows the installer
to select the minimum run
time for the compressor. For
Minimum
example, a setting of 4 will force
Compressor
the compressor to run for at
0.5 ˚F On Time least 4 minutes every time the
compressor turns on, regardless
of the room temperature.
This feature allows you to set a
Heating
maximum heat setpoint value. The
ON
Setpoint setpoint temperature cannot be raised
above this value.
Limit
This feature allows you to set a
minimum cool setpoint value. The
Cooling
ON
setpoint temperature cannot be raised
Setpoint
above this value.
Limit
Caution:
Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical shock or
equipment damage.
Warning:
All components of the control system
and the thermostat installation must
conform to Class II circuits per the
NEC Code.
Max Torque = 6in-lbs.
RH RC
24 VAC HOT
JUMPER SHOULD REMAIN 24 VAC Common
INSTALLED
24 VAC Common
24 VAC-Heat 24 VAC-Cool
*REMOVE PROVIDED *REMOVE PROVIDED *FROM COOL
JUMPER JUMPER TRANSFORMER
Heat pump changeover valve-- Energized during cooling
Heat pump changeover valve-- Energized during heating
LCD Will Show Adjustment Options
Use the
E HEAT STG
select 1-stage or 2-stage
1
operation.
OFF will allow Y(1st stage of
DUAL FUEL
Heat) and W2 (Aux Heat) to run
OF
together if called for.
ON Will de-energize Y terminal
If desired- This can
45 seconds after a call for
Auxiliary Heat (W2).
Use the
SATISFY SP
turn ON or OFF.
OF
Use the
STG DELAY
select OFF, 5, 10, 15, 30, 45,
OF
60, or 90 minutes.
You can set the minimum
MIN COMP
compressor run time to
"OFF", "3", "4", or "5" minutes.
If 3, 4 or 5 is selected, the
OF
compressor will run for at
least the selected time
before turning off. Use the
and
change the setting.
Use the + and - buttons to select
HEAT LIMIT
the maximum heat setpoint.
90
Use the + and - buttons to select
COOL LIMIT
the minimum cool setpoint.
44
C G
Blower / Fan
500mA
500mA
Blower / Fan
6
Default
or key to
1
OFF
or key to
OFF
or key to
OFF
OFF
buttons to
90
44
8