User Manual

Document No. 125-1009
Installation Instructions
April 27, 2020
Page 2 of 21 Siemens Industry, Inc.
Installation
Figure 2. Mounting Locations.
Install the thermostat approximately 5 feet (1.5M)
above the floor in a location with good air circulation,
where it can properly represent the average
temperature in the zone. Avoid the following
locations which could affect the sensor
measurement accuracy:
• Dead areas: behind doors, furniture or curtains;
in corners or alcoves.
• Hot/cold areas: concealed pipes or ducts; drafts
from heat sources or from doors or windows;
convection or radiant heat from the sun or any
electrical equipment; Unheated (uncooled)
structure parts such as outside walls behind the
thermostat.
An external room temperature sensor is
recommended if those situations cannot be avoided
in the installation area.
Refer to Energy Management System Network Plan
for MS/TP installation and configuration parameters.
1. Verify power to HVAC equipment is turned off.
2. Optional: To replace an existing thermostat:
a. Remove the existing thermostat.
b. Record wiring connections to existing
thermostat base plate terminals.
c. Remove the existing base plate.
3. Install the new thermostat base plate.
a. Feed all installed wires through the opening
in base plate and strip to 3/16-inch (5 mm).
b. Secure the base plate to the mounting
surface using supplied hardware.
NOTE: Ensure that the UP arrows embossed on the
base plate are pointed upward.
Figure 3. Thermostat Base Plate.
4. Attach the HVAC system wires to appropriate
terminals on the thermostat base plate Figure 3.
a. Verify HVAC equipment schematics for
required circuit connections to thermostat
Wiring Diagrams, Figure 5 and Figure 6.
b. Verify each 24 Vac transformer secondary
neutral is connected to HVAC ground.
c. If a single transformer is used, leave the
Jumper RH-RC in place. Connect 24 Vac to
RC terminal, and neutral to terminal C.
d. If separate transformers are used for
heating and cooling systems, remove the
Jumper RH-RC. Connect cooling 24 Vac to
terminal RC, neutral to terminal C and
heating 24 Vac to terminal RH.
e. Connect control wires to terminals Y1, Y2,
O/B, G, W1, W2, OUT1, OUT2, or OUT3.
f. Connect Sensor wires to terminals IN1,
IN2, IN3, or IN4 and adjacent INC common.
Optional: Auxiliary Output 3 can be changed to
a dry (unpowered) contact by removing Jumper
RC-C3 and connecting dry contact wires to
OUT3 and C3. See Wiring Diagrams, Figure 7.
Optional: If using Configurable Inputs 1 to 4 or
Auxiliary Outputs 1 to 3, use setup parameters
P301 to P320 to set functionality.
5. Attach MS/TP wire to NET terminals on left of
the thermostat base plate Figure 3.
CAUTION:
To ensure signal integrity observe MS/TP
network wire polarity, reference terminator
and shield earth grounded at one location,
two end of line terminators, and if required
an external network bias device.
MS/TP devices from some vendors may
refer to input A as (-) and input B as (+) or
may require external network bias.