Document No. 129-905
Installation Instructions
March 26, 2015
Page 2 of 18
Siemens Industry, Inc.
NOTE:
Ensure that the UP arrows embossed
on the base plate are pointed upward.
Figure 2. Thermostat Base Plate.
NOTE:
If 24 Vac was verified as being present
at the thermostat wires (see
Prerequisites
), skip Step 2 and proceed
to Step 3.
2. If 24 Vac is not present at the thermostat:
a. Locate the 24 Vac transformer or 24 Vac on
the terminal strip on the HVAC unit. Attach a
thermostat wire to the 24 Vac source. See
the HVAC equipment schematics to verify
the correct terminals.
b. Attach the other end of the unused wire to
the thermostat RH or RC terminal.
c. Verify that 24 Vac is present between the
RH/RC and C terminals.
3.
Attach the existing wires to the appropriate
terminals on the thermostat base plate. See
Wiring Diagrams
, Figure 4 and Figure 5.
Optional:
If using Auxiliary Inputs 1 to 4 or
configurable outputs 1 to 3, use setup
parameters P301 to P320 to set functionality.
4.
For systems with dual transformers, do the
following; otherwise, proceed to Step 5:
If separate transformers are used for heating
and cooling systems, connect 24 Vac from the
cooling system to RC, and 24 Vac from the
heating system to RH. Remove Jumper RH-
RC.
Optional:
Auxiliary Output 3 can be changed to
a dry (unpowered) contact by removing Jumper
RC-C3 See
Wiring Diagrams
, Figure 6.
5.
Attach thermostat to the base plate by engaging
tabs at the top and rotating the thermostat
downward until it is securely seated on the base
plate.
6.
Secure the thermostat to the base plate with the
Phillips screws (provided), using the holes at
the bottom of the housing.
The installation is now complete. Restore power,
and continue to
Thermostat Setup
.
Thermostat Setup
Figure 3. Thermostat Display.
Thermostat Display
Navigation Bar
Only one function can be selected at a time. The
small bar (cursor) below the function icon indicates
that a function is selected. Pressing an icon twice
navigates back to the Main screen.
A double bar cursor below the
Settings icon
[
]
indicates that you are in Programming mode.
The navigation bar at the bottom of the display
consists of four function icons.
Table 1. Navigation Bar Icons.
Icon
Name
Purpose
Setpoint
Enables adustment of temperature
and humidity (if applicable)
setpoints. Unit will display heating
setpoint if in Heating mode or
cooling setpoint if in Cooling mode.
Fan
Control
Enables fan relay to be controlled
as needed by thermostat (AUTO) or
to be on continuously (ON).
Mode
Selector
Enables manual changeover
between Heating and Cooling
mode. AUTO will enable the
thermostat to automatically switch
between heating and cooling mode
as required. OFF will disable all
control functions.
Settings
Enables Scheduler, Time/Date, and
Installer Set Up configuration. Also
enables access to service reminder
and fault messages.
